2) Selection of sewage treatment process according to local conditions, to achieve advanced technology, practical, safe and reliable, stable treatment effect, the treated water quality standards, and reduce the footprint.
3) On the basis of discharge standards, in the increasingly tense water supply, water costs are rising, consider the reuse of water.
4) Minimize the adverse impact of the sewage treatment plant on the surrounding environment to prevent secondary pollution.
5) Give due consideration to automated operation to simplify operation and management and reduce the labor intensity of workers, and easy maintenance.
6) Save energy, minimize operating costs, less investment in the project, small footprint, quick results.
7) Try to use new materials, new products to extend the service life of the equipment
3. Design standards and norms
1), "Sewage Comprehensive Discharge Standards" (GB8978-1996);
2), "Hospital Sewage Treatment Design Specification" (CECS07: 88);
3), "Outdoor Drainage Design Code for Outdoor Drainage (GBJ14-87);
4) Design Code for Water Supply and Drainage of Buildings (GBJ15-88);
5) Standard for Ambient Noise in Urban Areas (GB3096-93)
6) Structural Design Code for Water Supply and Drainage Engineering (GBJ69-84)
7) Miscellaneous Living Water Quality Standard for Miscellaneous Domestic Water" (GJ25.1-89)
8), "Code for the Design of Water in Buildings" (CESS30:91)
4, basic information
4.1 Designed water volume: the treated water volume of 680m3/d.
4.2 Inlet water quality
On the basis of research on the quality of wastewater from the similar hospitals, we obtained the quality of sewage water from this hospital, and the quality of wastewater from this hospital has been improved. Get the hospital's sewage water quality, comprehensive sewage water quality is:
No. Pollutants Sewage Raw Water Quality Unit
1 PH 6-9
2 SS 150-300 mg/l
3 CODCr 300-450 mg/l
4 BOD5 120-230 mg/l
5 NH3-N ≤50 mg/l
6 TP ≤4 mg/l
7 Total bacterial count ＞16000 bacteria/l
From the above table, it can be seen that this type of wastewater belongs to biochemical wastewater.
4.3 Discharge standard
Refer to the first-class standard in the national "Comprehensive Sewage Discharge Standard" (GB8978-96):
No. Pollutant substance Sewage effluent water quality Unit
1 PH 6-9
2 SS ≤70 mg/l
3 CODCr ≤100 mg/l
< p>4 BOD5 ≤30 mg/l5 NH3-N ≤15 mg/l
6 Phosphate ≤0.5 mg/l
7 Animal and vegetable oils ≤20 mg/l
8 Faecal coliforms ≤100 units/l
9 Total residual chlorine ≤0.5 mg/l
4.4 Wastewater reuse standards
No. Pollutant Toilet flushing, greening, car washing, sweeping Units
1 PH 6.5-9 6.5-9
2 SS ≤10 ≤5 mg/l
3 CODCr ≤50 ≤50 mg/l
4 BOD5 ≤10 ≤10 mg/l
5 NH3-N ≤20 ≤10 mg/l
6 Total hardness ≤450 ≤450 mg/l
7 Ozone No unwelcome sensation No unwelcome sensation
8 Total coliforms ≤3 ≤2
9 Free residual chlorine End-of-network not less than 0.2 mg/l
4.
4.5 Design content
According to the design of water and water intake and effluent quality, to determine the design of the sewage treatment station, which includes sewage treatment process, building dimensions and equipment selection and design, etc.
5.5 Design content
According to the design of water and water quality, to determine the design of the sewage treatment station.
5, wastewater treatment process
5.1 Process flow diagram
5.2 Wastewater treatment process
5.2.1 Water quality analysis and process selection
Hospital wastewater in a broad sense belongs to the domestic wastewater, but hospital wastewater is characterized by the presence of pathogenic bacteria, and therefore its technical focus on good disinfection. Moreover, for hospital wastewater, generally contain biological bacteria have inhibitory effect and difficult to biodegradation of pharmaceutical ingredients, so you can consider using the anaerobic treatment process placed in front of the first to hydrolyze the difficult to degrade organic matter. And in the increasingly tense water supply, water supply prices continue to rise today, it is necessary to effluent effluent reuse. Comprehensive consideration of the above this program is proposed to use low energy consumption of anaerobic hydrolysis + biological contact oxidation method as the main body, half of the effluent is used for sewage reuse, the treatment of reuse water using coagulation and sedimentation + adsorption and filtration + disinfection process can be used as a hospital flushing toilets, landscaping, car washing sewage treatment process. Through anaerobic and aerobic bacteria decomposition of organic matter to achieve degradation and removal of organic pollutants and harmful and toxic substances in the hospital comprehensive sewage, to achieve the "Comprehensive Sewage Emission Standards" (GB8978-96) level 1 emission standards, half of the effluent and then through the depth of disinfection to achieve the elimination of pathogens, bacteria, protection of human health, eliminating organic pollutants caused by the pollution of the hidden purpose; to achieve the "life of miscellaneous Water quality standards" (GBJ69-89) for hospital greening and flushing toilets, garage floors and other rinsing.
5.2.2 Selection of sewage treatment process
Hospital wastewater from a broad sense is part of the sewage dissolved CODcr and BOD5 are high, BOD: COD ratio & gt; 0.4, it is appropriate to use biochemical treatment process. Biochemical treatment process has the following advantages:
High treatment efficiency;
Low operating costs;
Low sludge production, no secondary pollution.
Biochemical treatment process mainly includes anaerobic treatment process, hydrolysis acidification process and aerobic treatment process.
Anaerobic biochemical method
refers to the process of decomposing all kinds of complex organic matter in wastewater into methane and carbon dioxide under the condition of no molecular oxygen through the action of anaerobic microorganisms, which can be used for the treatment of organic wastewater with medium and high concentration. The typical process of anaerobic biochemical treatment is UASB (upflow anaerobic sludge bed) process, which has more successful examples at home and abroad. Anaerobic biochemical method has the following advantages compared with aerobic biochemical method:
Wide range of applications;
Low energy consumption;
High load;
Low amount of residual sludge;
Anaerobic sludge can be stored for a long period of time, and it can be started up quickly after a certain period of time of cessation of operation.
However, anaerobic biochemistry also has the following disadvantages:
Anaerobic microorganisms are slow to proliferate, so that commissioning takes a long time, generally 0.5-1 year;
The effluent often fails to meet the discharge standard and needs further treatment, so it is usually treated in series after anaerobic aerobic treatment;
The operation of anaerobic treatment systems is more complex;
Methane gas is produced as a result of the high loads of methane gas. p> Methane gas is an explosive gas, which requires high safety settings if not utilized; it is easy to produce sulfide, which causes large odor and air pollution.
Anaerobic hydrolysis
1. Sewage anaerobic hydrolysis process Sewage anaerobic digestion reaction consists of the following three phases:
1) Hydrolysis phase: under the action of hydrolysis and fermentation bacteria, macromolecules, such as carbohydrates, proteins and fats are hydrolyzed and fermented into small molecules, such as monosaccharides, amino acids, fatty acids, glycerol and carbon dioxide, and the solids are hydrolyzed into soluble substances. Hydrolyzed to soluble substances.
2) Acidification stage: under the action of hydrogen-producing acetic acid-producing bacteria, the products of the first stage are converted into hydrogen, carbon dioxide and acetic acid.
3) Methanogenic stage: the conversion of acetic acid and hydrogen with carbon dioxide into methane by the action of two groups of physiologically different methanogenic bacteria.
As this device is connected to the biological contact oxidation process, the main purpose of anaerobic digestion here is to hydrolyze the macromolecule organic matter into small molecules that are easy to be biodegraded and to remove part of the organic matter. This device adopts short residence time, so that the anaerobic reaction occurs in the hydrolysis, acidification stage, inhibit the activity of methane-producing bacteria, and produce only a small amount of gas, which provides a reliable guarantee for the safe operation of this device. Because this device is underground, you can consider the anaerobic treatment of the small amount of problems generated by the gas conduit discharge, so there is no odor problems and the risk of combustion and explosion.
2, biological contact oxidation treatment
After anaerobic treatment of sewage, it enters the biological contact oxidation tank. Bio-contact oxidation is a biofilm process between activated sludge and biofilter, the contact oxidation tank is equipped with filler, part of the microorganisms in the form of biofilm solid growth on the surface of the filler, part of the flocculent suspended growth in the water, so it has both activated sludge and biofilter characteristics.
In this device, the sewage through the anaerobic biochemical reaction, part of the organic pollutants in the sewage is decomposed or removed by anaerobic bacteria, and then the sewage into the biological contact oxidation tank. The pool is equipped with semi-soft filler (i.e., hard plastic as a support, bound to soft fibers above), which can prevent the growth of biofilm fibers into a ball after the growth of the specific surface area of the filler is reduced. Hydrolysis acidification pool in the decomposition of macromolecular organic matter is not completely further processing, and filter out most of the suspended solids, and finally the sewage into. After the biological contact oxidation tank set up a sloping tube sedimentation tank, intercepting the biofilm and suspended sludge with the water flow.
The aeration device of this biological contact oxidation system is located at the bottom of the filler, and adopts the air blower aeration system, which can increase the effective volume, and the turbulence between the layers of filler is intense, and the biofilm is renewed quickly, with high activity, and is not easy to be clogged.
The biological contact oxidation process features:
1) Due to the large surface area of the filler, the pool oxygenation conditions are good, the biomass per unit volume in the biological contact oxidation pool is higher than the activated sludge method aeration pool and biofilter, so the biological contact oxidation pool has a high volumetric load;
2) Due to the considerable portion of the microorganisms attached to the surface of the filler growth. Bio-contact oxidation method does not need to have a sludge reflux system, there is no sludge expansion problem, operation and management is simple;
3) due to the bio-contact oxidation tank biosolids, the water flow is completely mixed, so the bio-contact oxidation tank on the water quality of the water quality and quantity of the sudden change of a strong adaptive capacity.
4) The semi-flexible filler, made of densified polyethylene plastic, has a certain degree of rigidity, but also has a certain degree of flexibility, can maintain a certain shape, but also has a certain degree of deformation ability. It has good mass transfer effect, high removal effect of organic matter, corrosion resistance, non-clogging, easy to install, easy to hang film.
5) Simple operation, convenient operation, easy maintenance and management, no sludge expansion phenomenon, and no filter fly.
6) biological contact oxidation treatment technology has a variety of purification functions, in addition to the effective removal of organic pollutants, nitrogen removal and phosphorus removal also has a certain effect.
As a result of the use of front anaerobic hydrolysis pool, the formation of anaerobic - aerobic phosphorus denitrification process, which has a certain effect of denitrification and phosphorus removal.
The biological denitrification process is completed by two steps: nitrification and denitrification. Nitrification is the oxidation of ammonia nitrogen into nitrate, completed under aerobic conditions. Denitrification is to reduce nitrate into nitrogen from the water, in anoxic conditions (no molecular oxygen but nitrate oxygen) and organic matter to supply denitrifying bacteria carbon energy can be completed. Therefore, the traditional biological denitrification for nitrification - denitrification process, denitrification before the addition of organic chemicals, process complexity, more structures.
Pre-denitrification denitrification technology, first introduced into the anoxic section of the sewage, in which the organic matter in the sewage as a carbon energy source, denitrification of nitrate denitrification, organic matter has been initially degraded; and then enter the section, in which the organic matter is further degraded and ammonia and nitrogen nitrification, and nitrification of aerobic section of the effluent mixture refluxed to the anoxic section, the anoxic section to provide enough nitrate denitrification; after the section there is still a secondary sedimentation tank, which can provide enough nitrate denitrification; after the section, there is still a secondary sedimentation tank. After the section, there is still a secondary sedimentation tank, and the precipitated sludge flows back to the aerobic section to ensure sufficient microbiological reasoning.
Biological phosphate removal process consists of anaerobic section (no molecular oxygen and nitrate state oxygen), aerobic section and secondary sedimentation tank. Some bacteria in activated sludge have the characteristics of releasing phosphorus under anaerobic conditions and over-absorbing phosphorus under aerobic conditions, and phosphorus is removed from the water by discharging phosphorus-rich residual sludge.
3, disinfection
Hospital sewage after biochemical treatment, in addition to some of the bacteria precipitated with the sludge, most of the Escherichia coli, Streptococcus faecalis and other pathogens are still present in the sewage, disinfection must be carried out.
At present, there are many ways to disinfect hospital sewage, such as liquid chlorine, ozone, sodium hypochlorite chlorine dioxide method. Although the sodium hypochlorite method has the advantages of formulation, low price, high reliability, but will be combined with some organic matter in the water to generate carcinogenic organic halides. Chlorine dioxide is recognized as the best disinfectant, its sterilization effect is good, is the ideal alternative to sodium hypochlorite. This system uses chlorine dioxide method for disinfection. The disinfection pool adopts advection type partition contact reaction device to improve the contact time and achieve better disinfection effect.
4, sludge disposal
Hospital sewage after sedimentation, sludge contains a large number of bacteria, if directly discharged, will cause secondary pollution. Designed to use chlorine dioxide disinfection treatment, stay more than 10 days out of landfill.
5, dechlorination disposal
In the hospital sewage disinfection process, in order to ensure that the disinfection and sterilization capacity to achieve the elimination of viruses, bacteria, the requirements of the contact time is not less than 1 hour, the total chlorine residual amount of 4-6mg / l, but in accordance with the comprehensive sewage discharge standard GB8978-96 of the first level of standard regulations: chlorine residual effluent should be less than 0.5mg / l, it must then be Therefore, dechlorination treatment must be carried out again. This program in the back of the disinfection pool connected to a dechlorination pool, using reductant Na2S2O3 dechlorination, to ensure that the total chlorine after dechlorination indicators to meet the discharge standards, Na2S2O3 dosage of 10g/m3 sewage.
6, sewage reuse treatment
Based on the principle of sewage resource utilization, the program considers 300m3/d sewage reuse for greening, toilet flushing, in order to achieve significant economic and social benefits. Domestic and foreign data show that the use of "coagulation + precipitation + disinfection" process depth treatment of secondary treatment effluent can make the water quality to meet the reuse standards.
5.2.3 Outstanding features of the process
1) The process of small energy consumption, in addition to the sewage lifting pumps set up in front of the hydrolysis tank and the aeration blower, basically no energy consumption. This process is technologically advanced, low operating costs, energy saving, reduce operating time, reduce staff shifts and labor intensity and other advantages, suitable for hospital sewage treatment.
2) through the setting of hydrolysis acidification tank, improve the removal rate of pollutants; biological contact oxidation pool water flow is completely mixed, can effectively resist the impact of water quality, water quality changes in the load, improve the stability of the treatment device operation. Due to the use of front anaerobic hydrolysis pool, the formation of anaerobic - aerobic phosphorus denitrification process, with a certain degree of nitrogen and phosphorus removal.
3) This device takes into account the reuse of sewage effluent, which is of practical significance and demonstrative role in today's increasingly tense water supply and rising water costs.
4) This device is built in the green belt, roads, parking lots or other sporadic ground below, does not account for construction land, the ground can be used, low investment, a permanent benefit of investment.
5) The treatment system is underground, in the anaerobic hydrolysis produces a very small amount of gas through the conduit gas pipe and the atmosphere, no pressure inside the device, there is no possibility of combustion and explosion.
6) As the sewage is treated aerobically in front of an anaerobic hydrolysis (acidification) pool, the amount of residual sludge is very small.
7) The device adopts advanced and mature combination process, and the emission indexes after treatment meet the national emission standards.
8) The device has a compact structure, small footprint, high degree of integration and low investment.
5.2.4 Brief description of the process
After the hospital sewage flow, through the coarse and fine grating, filter out cotton balls, slag, paper and other large particles of material into the regulating pool, the main role of the regulating pool is to regulate the quality of sewage and water quality and water quality homogenization, so that the subsequent process from the impact of the load, the effluent by the sewage pump into the anaerobic hydrolysis pool. By controlling the residence time of the hydrolysis tank, the hydrolysis and acidification stage occurs, the large molecules of difficult to degrade organic matter hydrolyzed into small molecules of organic matter, improve the efficiency of sewage treatment. Bio-contact oxidation tank is filled with semi-soft packing, most of the pollutants are removed in the bio-contact oxidation tank, which is connected to the inclined tube sedimentation tank, and the sludge produced by the inclined tube sedimentation tank and bio-contact oxidation tank is pumped into the sludge tank by the sludge return pump, and the sludge in the sludge tank is regularly discharged, and the supernatant is refluxed into the conditioning tank for treatment. Half of the effluent from the sedimentation tank is disinfected by chlorine dioxide, and after disinfection, it is dechlorinated by the reductant Na2S2O3, and discharged to meet the discharge standard. The other half of the effluent for reuse, the use of coagulation and precipitation treatment, followed by adsorption and filtration pool, the same sludge precipitation into the sludge tank, the effluent from the chlorine dioxide for disinfection, disinfection and use of reductant Na2S2O3 dechlorination, to meet the reuse standards for reuse.
5.2.5 Treatment effect table
Treatment unit name CODcr (mg/L) BOD5 (mg/L) SS (mg/L) plant and animal oil (mg/L) phosphate (mg/L) ammonia nitrogen (mg/L)
Inlet 450 200 200 50 4 50
Regulating pool Removal rate 20% 20% 40% 29% 25% 25% 40% 29% 25% 25%
Effluent 360 160 120 35.5 2.8 37.5
Hydrolysis tank Removal rate 30% 30% 25% 30 % 25 % 25 % 25 % 25 %
Effluent 252 112 90 25 2.1 28.1
Bio-contact oxidizing tank Removal rate 70% 80% 10% 20% 70% 45%
Bio-contact oxidizing tank Removal rate 70% 80% 10% 20% 70% 45%
Biological contact oxidation tank 45%
Effluent 75.6 22.4 81 20 0.63 15.5
Sedimentation tank Removal rate 5% 5% 80 % 10 % 30% 20 %
Effluent 71.8 21.3 16.2 18 0.44 12.4
Disinfection tank Removal rate 5% 5% 5%
Effluent 68 20.2
Dechlorination tank Removal rate
Effluent 68 20.2
Dechlorination tank Removal rate
Effluent
Discharge quality 68 20.2 16.2 18 0.44 12.4
Maximum permissible discharge concentration 100 30 70 20 0.5 15
6. The main structures and equipment parameters
6.1 Grid
Grid is mainly used to intercept large particles of material. Divided into two, before the coarse grille, after the fixed fine grille, grille installation angle of 600, the width of the two grilles are 500mm, coarse grille grille bar spacing for 20mm, fine grille grille bar spacing for 12mm. manually fishing slag.
The size of the grating well is 2.0m×1.0m×1.5m
6.2 Conditioning tank
The hydraulic retention time of the conditioning tank is 7.7h
Inside diameter: 10.7m×4.5m×4.5m
Overheight: 0.5m
Reinforced concrete structure.
The submersible sewage pump selected for the regulating pool has the advantages of high efficiency, anti-tangling, non-clogging, auto-coupling, high reliability and automatic control, etc. The pump can be easily lifted to the ground through the fixed guide bar, and the maintenance is very convenient. And it can simplify the structure and civil engineering work, save engineering cost and improve the working environment.
6.3 Anaerobic hydrolysis tank
Hydraulic retention time HRT is 3.9h
Inner diameter: 5.4m×4.5m×(4m+0.5m)
Among them, 0.5m is ultra-high
Reinforced concrete structure.
The gas produced by the anaerobic hydrolysis tank is discharged by the gas conduit, and there is no danger of combustion and explosion.
6.4 Biological contact oxidation tank (with two-stage aeration)
This structure is the key of the whole process, combining the advantages of activated sludge method and biofilm method, without sludge reflux, with strong shock load resistance and high volumetric load. It is filled with semi-soft filler, which is easy to hang film and has stable operation effect.
Filled with Φ150 semi-soft packing,
Aeration equipment using Roots blower or submersible aerator.
Hydraulic retention time HRT is 8.0h
Dimension: 10.9m×5.0m×(4.0m+0.5m)
Among them: 0.5m ultra-high
The volumetric loading of BOD5 is 0.72kgBOD5/m3-d,
Reinforced concrete structure.
6.5 Inclined Pipe Sedimentation Tank
Inclined Pipe Sedimentation Tank is mainly used to settle sludge,
Inclined Pipe is made of honeycomb packing, specification Φ50
Hydraulic Residence Time HRT is 2.0h
Dimension:5.0m×3.2m×(4m+0.5m)
Others:0.5m is super high
Surface load:2.0m2/m3.h
Reinforced concrete structure.
6.6 Disinfection and dechlorination pool Ⅰ
Disinfection pool is mainly used for disinfection, oxidation of bacteria to destroy the organism.
Chlorine dioxide is used as a disinfectant
The disinfection pool adopts vertical flow partition device, and Na2S2O3 is added as a reducing agent to dechlorinate at the last two partitions.
Hydraulic retention time HRT is 1.5h
Dimensions: 3.0m×2.4m×(4m+0.5m)
Among them: 0.5m is super-high)
Steel-reinforced concrete structure
6.7 Sludge tank
The sludge of the sludge tank is pumped by sludge return pumps to pump the respective settled sludge into.
The supernatant of the sludge tank is returned to the conditioning tank.
The sludge is disinfected with chlorine dioxide and discharged periodically.
The retention time of sludge in the sludge tank is 10d.
Dimensions: 4.5m×3.2m×(4.2m+0.3m)
Among them: 0.3 is super-high
Reinforced concrete structure
6.8 Reaction Tanks
Three reaction tanks are used in series for coagulation and precipitation, and air mixing is used.
Dimensions: 2.4m×0.8m×(3.9m+0.5m+0.1m)
Where: 0.5 is the super-high, 0.1 is the drop
Hydraulic retention time HRT is 0.35h
Reinforced concrete structure.
6.9 Adsorption filtration pool
Dimensions: 3.2m × 2.4m × (3.8m + 0.7m)
Where: 0.7 for the super-high
Surface loading is: 2m2/m3.h
Steel-reinforced concrete structure
6.10 Disinfection and dechlorination pool Ⅱ
With disinfection and disinfection and dechlorination pool I The same.
6.11 water pool
Storage of water for reuse for greening, toilet flushing, etc.
Size: 4.3m × 2.4m × 4.5m
Hydraulic retention time HRT of 3.2h
Reinforced concrete structure.
6.12 Mechanical room
Mechanical room underground floor inside the Roots blower, sewage pumps and sludge pumps. The hospital janitor's room is also placed in the chlorine dioxide generator.
Size 5.0m × 4.5m × 3.3m
Reinforced concrete structure
Roots blower
In biological contact oxidation treatment, aerobic microorganisms in the oxidative decomposition of organic matter to be consumed by dissolved oxygen, and therefore the need for timely supplementation of dissolved oxygen to the sewage. The use of microporous aerator, oxygen transfer rate of 25% -32%.
Fan selection of three Roots blower, two with a backup, Model: Chuan Yuan L2428Z blower, performance parameters: speed 780r/min, flow rate of 7.12m3/min. supporting motor for the Y132M2-6, power 5.5KW.
With the bottom of the noise level, the whole vibration of the machine is small, long service life, energy saving and simple structure, maintenance and repair of the advantages of its performance parameters
With the bottom of the noise, the machine vibration is small, long service life, energy saving and simple structure, maintenance and repair of the advantages of easy.
6.13 Chlorine dioxide generator
According to the standardization of hospital wastewater secondary effluent standards, the choice of BH5-SYL (Ⅲ)-500, power 1.5KW, Beijing Zhongxi Group production.
6.14 dechlorination dosage machine
Pump dosage, automatic control of dosage, easy to operate, the pump selected CQ16-8, Shanghai permanent pump industry, P = 120W
6.15 sewage pump
Selected two models of 50QW25-10-1.5 sewage pumps, one with a backup.
Manufacturer: Bo Pump
6.16 Sludge Pump
Two 50QW42-9-2.2 sludge pumps are selected, one of which is used to pump the sludge generated from the biological contact oxidation tanks and sedimentation tanks to the sludge tanks, and the other is used as a backup.
Manufacturer: Bo Pump
6.17 Sewage Lifting Pumps
Two 50QW25-10-1.5 submersible sewage pumps are selected, and their performance parameters are as follows:
Flow rate of 25m3/h, head of 10m, and power of 1.5KW.
Manufacturer: Bo Pump
6.18 Reuse Pumps
Two 80IS25-9-2.2 sludge pumps are selected. Two sets of 80IS25-20-4 pumps,
Performance parameters: head 20m, power 4KW.
Manufacturer: Bo Pump
6.19 Accident pool
Dimensions: 6.8m×4.5m×4.5m
Hydraulic retention time: 4.9h
6.20 Control system
Online DO monitor 1 set
Residual chlorine monitor 2 sets
Sludge level meter 1 set
Frequency converter 3 sets
Liquid level controller 6 sets
Control box 1 set
7. Prevention and Control of Secondary Pollution
1) As the project is below the ground level, pumps used in the wastewater treatment facilities are basically No noise. For Roots blower, itself with a muffler, shock absorber, and put underground work, so the noise of the sewage treatment station will meet the urban noise standard GB309693 in the second category standards, daytime ≤ 60dB (A), night ≤ 50dB (A), while the gas, water pipe in the flow rate to take a low speed, and equipment interfaces with the addition of soft joints.
2) sewage treatment structures fully enclosed, buried, covered with soil and planted flowers, etc., the pool of exhaust gas into the upper part of the building exhaust emission system, with a special pipe into the complex building exhaust gas wells, high-altitude dilution emissions.
3) Garbage incineration disposal, so that no secondary pollutants.
4) This sewage treatment project adopts the most advanced chlorine dioxide generation device, replacing the traditional sodium hypochlorite hospital wastewater disinfection device, to avoid secondary pollution in the discharge process.
8, construction organization design
8.1 The main construction technical measures
Civil construction: steps include excavation, pre-buried pipeline, bedding, reinforcement, pouring concrete, backfill, greening, strict requirements in accordance with the construction specifications.
Installation construction: for a variety of special and general equipment, in accordance with the product or equipment to install the random technical documents, while combining the other pipeline, electrical, automated professional installation of technical requirements to improve the construction technology with.
General equipment installation construction includes the following major procedures:
(1) equipment unboxing, point pieces, acceptance.
(2) equipment foundation measurement, demarcation, inspection
(3) equipment lifting, in place, the initial leveling grouting acceptance.
(4) equipment fine leveling, cleaning and inspection, filling lubricant.
(5) equipment test run.
The main equipment installation with:
(1) the installation of pumps, pumps should be made before the installation of process piping in the pump room before the fine leveling work. And the test run of the pump must be carried out after the installation of piping and electrical devices, water pressure test, electrical test end of water.
(2) axial flow ventilator installation, installed in the upper part of the wall ventilator, in the civil engineering wall construction subterfuge fixings or bolts buried, wall construction and then install the fan.
(3) with an independent concrete foundation, reserved holes for ground bolts using the second grouting installation equipment. Before the construction of the civil foundation, the installation should be coordinated with the verification of the foundation and equipment base size. Check the tongue before pouring concrete.
(4) All equipment installation elevation should come from the absolute elevation of the civil design, so in the handover and confirmation of the design of the elevation, there should be a handover procedure and sign with the civil engineering, installation.
The buried pipeline in line with the principle of first deep after shallow, first gravity flow pipeline after pressure flow pipeline.
As the environment of the sewage treatment station on the steel parts of the corrosion is very serious, in order to avoid and reduce the impact of corrosion so as to extend the service life, all steel brackets and pipes must be in accordance with the requirements of the process of anticorrosion treatment:
Pipeline outer wall of the reinforced epoxy coal asphalt four oil and two cloth corrosion;
Pipeline inner wall of the polymer material spraying.
8.2 Engineering Quality Assurance Measures
Quality Policy: Scientific Management, Quality First, Customer Satisfaction for Products and Services
Quality Commitment: ① Guarantee the fulfillment of the contract, the engineering products comply with the requirements of the design and specifications, and do a good job of service for the owner to meet the owner's needs. ② comply with the quality, guidelines, policies and regulations issued by the state authorities.
I unit quality system of the relevant functional departments will be in the composition of personnel, ideological education, technical assurance, quality and safety supervision, materials, machinery supply and other professional management for the project to provide assurance.
Will be established to the project manager, the project manager to establish the project quality control system to process quality control as the main work, and with the unit of quality assurance system and technical supervision system to form a complete quality assurance system.
Specifically, the following measures:
(1) good raw materials, semi-finished products, equipment checking the gate
by the quality engineer is responsible for focusing on steel, cement before entering the field of inspection, does not meet the quality standards of materials are not allowed to enter the field of materials, by the material, quality control, testing, technical cadres composed of raw materials acceptance team to handle this work. The quality of incoming raw materials, models, specifications, varieties must meet the design requirements, and factory certificates or complete test data.
Warehouse manager, must be the appearance of raw materials into the field quality inspection, check the name, specifications, size, material is not in accordance with the specifications shall not be signed. Without the warehouse custodian signed the raw materials are not allowed to use in the project, strengthen the sand, coarse aggregate test.
(2) seriously implement self-inspection, mutual inspection and handover inspection of the three inspection system and special inspection system. Three inspection system by the quality inspection department is responsible for, in the shift between the process. Seriously fill out the three inspection form, and fulfill the signature procedure. Specialized inspection system by the quality inspection department full-time quality inspector, the project department with a quality inspection engineer, full-time quality inspector 2 people, on-site inspection of construction technology, quality, test data, technology and process quality assessment. Selected and equipped with advanced quality testing and measurement equipment, so that the test results are accurate.
(3) carefully control the quality of concrete
Concrete construction is the focus of the entire project, using the following program chart for quality management: