First of all, the chemical method to make the dissolved state of pollutants from the true solution state precipitation, the formation of solid-phase interface with the colloidal particles or tiny suspended particles; the selection of highly efficient and economical adsorbent will be organic pollutants, color, etc., from the sewage separation; and then use the micro-physical adsorption method of the sewage of all kinds of colloidal particles and suspended particles cohesion into a large and dense Floc; and then according to * cyclone and filtration hydraulics and other principles of fluid mechanics, in their own design of SPR high turbidity sewage purifier to make the floc and water rapid separation; clear water through the tank after the formation of the dense layer of suspended mud filtration, to achieve the level of tertiary treatment, the effluent to achieve the reuse of water; the sludge is in the concentration chamber is highly concentrated, and regularly * pressure discharge, due to the sludge low moisture content, and good performance of dewatering, can be sent directly to the mechanical dewatering device. Due to the low water content of sludge and good dewatering performance, it can be directly sent to the mechanical dewatering device, and the sludge cake after dewatering can also be used to make sidewalk tiles, eliminating secondary pollution. Its sewage purification and reuse system process flow diagram (Figure 1)
Sewage purification and reuse system flow process diagram
Second, SPR wastewater treatment technology features:
1 . Mixing of urban sewage and treatment chemicals is mainly in the pump before the suction pipe, sewage pump impeller, serpentine reaction tube and ceramic ball reaction tank under the combined effect of the completion of the best coagulation purification effect and save chemicals to create the conditions. With the past conventional primary and secondary treatment of the hydraulic structure is different.
2. The use of more than five sewage treatment chemicals and their optimal combination of formulations, so that the dissolved state of organic pollutants in sewage, heavy metal ions and harmful salts precipitated from the water to become a solid-phase interface of the micro-particles (which contains the role of tertiary treatment of sewage), * coagulation of physicochemical adsorption will be suspended and various types of impurities cohesion into a large and dense flocs in order to remove. An adsorbent with good adsorption effect is also used to adsorb organic pollutants and chromaticity. In the * disinfectant in the process of 30 minutes to kill bacteria and E. coli. This way to play the individual role of each agent and the cross-linking between them in the way of dosing is not the same as the conventional physical-chemical method .
3 . According to the formula derived from the simulation test, with the help of atmospheric pressure and flow meter, very accurate dosing of coagulants and flocculants, to prevent overdosing and waste of chemicals and reduce power consumption.
4 .SPR sewage purifier internal structure is completely in accordance with the coagulation mechanism of the precise design, the formation of the vortex flow and the appropriate speed of the water flow in all parts of the colloidal particles have the most collision between the number of times, and there is the optimal flow rate environment required for cohesion and adsorption. Thus, in a very small volume to obtain a very full cohesion effect.
SPR sewage purifier hydrodynamic structure
5 . The use of the tank in the upper part of the formation of a few tens of centimeters thick, very dense suspended mud layer, all the coagulated water through the suspended mud layer of filtration, the water flow to the tank in the upper part of the clear water area. Than the previous water treatment process reduces the membrane filtration, microporous filtration, or activated carbon filtration devices such as and it filters the head resistance. Figure 3:
Figure 3
6 . Selected flocculant, but also a good sludge filter aid, so that the sludge slurry discharged, its dewatering performance is good, you can not add another filter aid, it is directly pumped into the filter press dewatering. The sludge cake can be made into sidewalk tiles for reuse, which will not bring the problem of secondary pollution. Reduce the traditional biochemical method of sludge produced by the high water content, dehydration performance is very poor weakness. Figure 4
Figure 4
7 . Sewage purifier has a wide range of applications, especially for today's most difficult to deal with textile printing and dyeing sewage, recycled paper and paper sewage, animal slaughterhouse sewage, ceramic factory porcelain sludge sewage, coal mine sewage and other sewage containing a large number of organic pollutants and ammonia nitrogen removal, sewage purification and reuse to achieve the closed-loop recycling of industrial water, not only to solve the problem of environmental pollution, but also to save a lot of water resources, thus greatly reducing the production cost of the enterprise. Authoritative testing departments around the world tested the sewage purifier water inlet and outlet data. Water purification process takes only 30 minutes, the water indicators are as follows:
a. Ammonia nitrogen removal rate can reach 85% b. Total nitrogen removal rate of up to 95%
c. Organic nitrogen removal rate of up to 96% d. BOD removal rate of up to 95%
e. Suspended removal rate of up to 98.3% ~ 99.6% f. Decolorization efficiency of more than 98%
g. p>
g. After treatment, the effluent CODcr<100mg/l, SS<3mg/l (turbidity<3degrees) liters)
8. The system put sterilization chemicals, disinfection with chlorine (no need to increase the pressurized equipment) and to play a role in removing the role of ammonia, to improve the efficiency of the sewage system for the removal of ammonia nitrogen.
9. Ammonia nitrogen content of the effluent has not reached the requirements (such as some developed countries or developed regions will be set as the drainage standard containing ammonia nitrogen below 1 mg / liter), can be followed by a series of setting up a level of ion exchange devices, * oblique hair zeolite ion exchange columns ultimately to achieve the goal of removing ammonia nitrogen.
As early as the 1970s, Minneapolis, Minnesota, the United States of America, the Rosemount Wastewater Plant is purely physicochemical treatment of municipal wastewater, the process is: chemical coagulation ---- sedimentation ---- filtration and activated carbon adsorption ---- oblique zeolite ion exchange. Its final effluent water quality standards are: ammonia nitrogen 1 mg / liter, BOD 10 mg / liter, phosphorus 1 mg / liter, suspended solids 10 mg / liter, pH 8.5.
10 . Treated water reuse, instead of tap water as urban green water, will greatly save the city's freshwater resources, reduce the pressure on municipal departments of the city's water supply, the overall economic development of the city will have a very great benefit.
11 . This purely physicochemical sewage treatment system, by the weather, the environment and the influence of human factors less.
Three, the application of SPR
For example: China's Dagang oilfield residents living sewage purification and recycling system project
1.1 domestic sewage treatment plant SPR process flow new model: the following Figure 5
1.2 SPR wastewater treatment equipment, system process layout Figure 6
SPR wastewater treatment equipment, system process arrangement
1.3 SPR wastewater treatment equipment system process layout Figure 7
SPR wastewater treatment equipment system process layout
2. Dagang oilfield residents living in the sewage water quality, treated effluent quality requirements and the amount of water to be treated
Dagang oilfield living in the sewage is mainly from the life of a few neighborhoods, which are also part of the commercial discharge water. This wastewater treatment plant serves a population of about 140,000 people.
Based on the lack of freshwater resources in the oilfields and the requirements of preventing water pollution, the regenerated effluent from the purified sewage of the oilfield residents is used as municipal water for town greening, industrial water, and other municipal water sources such as car washing, toilet flushing, etc. This not only prevents the pollution of the water environment by town sewage but also greatly saves the local freshwater resources, and provides a second source of freshwater for the oilfield's industrial production*.
The total amount of urban domestic sewage in the residential areas of the oilfields is 6,000 cubic meters per day.
The water demand for green irrigation in the town is 5,000 cubic meters/day.
The water demand for industrial use in the oilfields is 340 cubic meters/day.
3. Quality of effluent water after treatment by SPR system
a. CODcr < 50 mg/liter
b. BOD5 < 20, SS < 3 mg/liter
c. Ammoniacal Nitrogen < 10 mg/liter
d. E.coli group < 3 / liter, Residual Chlorine >. 0.3 mg/l
e.pH 6~9
4. Sewage treatment process
Life wastewater through the existing septic tank settlement adjustment into the town sewer, centralized flow into the wastewater treatment plant, the first after the sieve to remove large debris, and then alternately into the regulating tank A or B, to the regulating tank to remove organic pollutants thrown into the chemicals, * mixing complete Mixing and primary reaction process, and prevent precipitation in the regulating pool (each regulating pool capacity of 2 hours flow: 300 cubic meters), * sewage pump has been regulated sewage inhalation pipeline, at the same time * sewage pump suction end of the negative pressure in accordance with the design of the pharmaceutical formula for inhalation of sewage treatment chemicals (including coagulant chemicals, disinfectants, disinfectants, sludge dewatering additives, etc.), through the pipeline after mixing directly from the SPR Sewage purifier bottom into the tank, in the SPR purifier tank to complete the whole process of coagulation, fine filtration and sludge concentration, purified water through the top of the exit pipeline out into the clear water storage tank, * clear water pump will be given to the user of regeneration water (industrial water or irrigation water), a fixed period of time * clear water pump pressure will be thickened sludge slurry from the sludge concentration room of the SPR purifier pressed (sludge slurry moisture content < (water content of sludge slurry<98%), and sent to the gravity sludge thickening tank to thicken again (water content of sludge slurry after thickening again<95%), *slurry pump will be thickened again after the sludge thickening tank concentrated slurry directly into the sludge dewatering machine to implement dewatering, dewatered sludge cake by the car to be used for landfill. Every 4 to 6 hours of operation about the implementation of a tank backwash operation, backwash time for 3 to 5 minutes. After the sludge thickening chamber is full, a pressure sludge discharge operation is carried out every 6 to 8 hours of operation, and the sludge discharge time is 10 to 20 minutes. Tank backwash sewage and sludge dewatering process of sewage are flowing back to the sewage regulating pool into the next purification process.
The whole sewage purification process has only one sewage pump as the power source for sucking up sewage, adding chemicals, mixing, coagulation, filtration and sending out clean water, and the power consumption for purifying sewage is 0.125 degrees/1 cubic meter of sewage.
Treatment of sewage chemicals consumption costs 0.6 to 0.8 yuan / cubic meter. (The formulation of sewage treatment chemicals will be finalized based on the results of actual sewage process simulation tests.)
The sewage purification system operates continuously, consisting of 6 sets of SPR-50 sewage purifier systems in parallel to form a system, each with a water production rate of 50 m3/hour, and a daily water treatment capacity of 1,000 m3/set calculated on the basis of 20 hours of operation per day, with sufficient time set aside for auxiliary operations and maintenance, such as backwashing and mud removal. The daily sewage treatment capacity of the whole system is 6000 cubic meters.
5. System main equipment
(1). Debris screening machine (2). Sewage conditioning tank (3). Sewage tank mixer (mechanical mixing type or hydraulic mixing type)
(4). Sewage pump (5). SPR-50 sewage purifier (6). Sludge thickening tank
(7). Slurry pump (matching with sludge filter press)
(8). Automatic chamber (plate and frame) filter press
(10). Pharmaceutical storage tank and dosing flow meter system (including support platform frame) (non-standard production)
(11). Pharmaceutical dissolution preparation device system (including support platform frame) (non-standard production)
(12). Oxygen flushing jet fresh water pump
Example photos
Photos of a system that treats 4,000 cubic meters of wastewater per day
Shown in the photo is a water production rate of 50 cubic meters per hour.
SPR new process of sewage treatment, effectively solve the industrial and urban discharge of high concentration of sewage and sewage suspended substances and remove ammonia and nitrogen content. The water quality of treated sewage is higher than that of the previously treated water, which can be utilized as water for urban and industrial and watering grass and trees, greatly reducing the pollution of the environment and saving fresh water resources, so that a part of the region lacking fresh water resources can be solved. Widespread application of this technology, the community to bring very great benefits.
V. References:
1. SPR wastewater treatment technology in the United States
2. SPR high turbidity wastewater treatment technology
3. SPR wastewater treatment technology to achieve the regeneration of municipal wastewater with economic and efficient physical and chemical methods and reuse
4. Dagang Oilfield, China, residents of the domestic wastewater purification and regeneration of recycling system project