1, design basis
1) Relevant information provided by the owner;
2) Class-I B standard of Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB 189 18-2002);
3) Code for Outdoor Radiation Design (GBJ14-87);
4) Environmental Noise Standard (GB 5096-93);
5) Code for Design of Low Voltage Distribution (GB 50054-95；; );
6) Technical specifications for water supply and drainage engineering and sewage treatment engineering construction;
7) Practical experience and engineering parameters of similar projects completed by our company.
2. Design principles
1) Strictly implement the current national technical standards and norms for environmental protection and abide by national and local laws and regulations on environmental protection;
2) Advanced, reasonable and reliable treatment technology is selected, which is simple in operation, convenient in management, less in land occupation, less in investment and low in operation cost on the premise of ensuring the treatment discharge reaches the standard;
3) This project is an environmental protection project, so special attention should be paid to environmental protection to avoid and reduce secondary pollution. It is required to improve labor hygiene conditions and implement the policy of safe production and clean and civilized production;
4) In order to improve the management level of sewage treatment station, the design adopts a high degree of automation and low labor intensity of operators;
5) Reasonable selection of high-quality accessories, reducing energy consumption, improving work efficiency and service life, and reducing costs;
6) In the process design, it has greater flexibility and adjustability to adapt to the periodic changes of water quantity and water quality. Adopt a set of sewage treatment facilities to improve the flexibility and variability of the system;
7) Adopt sludge pre-reflux nitrification process to reduce sludge output;
8) Adjust measures to local conditions, make rational layout and make effective use of space.
3. Design scope
1) from the grid well of sewage treatment to the discharge port of treatment equipment.
2) Process flow design, process equipment selection, process equipment structure arrangement and electrical control of sewage engineering.
3) Construction, installation and debugging of reinforced concrete structures and equipment in sewage treatment project.
After gravity concentration in the concentration section, the sludge is transported to the dehydration section. In the process of propulsion, with the gradual reduction of filter gap and pitch, as well as the blocking effect of back pressure plate, huge internal pressure is generated, and the volume is continuously reduced to achieve the purpose of full dehydration.
Brief introduction of equipment
The stacked screw sludge dehydrator is a new type of solid-liquid separation equipment. It uses the principle of screw extrusion to realize sludge extrusion dehydration through the strong extrusion force generated by the change of screw diameter and pitch and the tiny gap between the traveling ring and the fixed ring.
Principle of equipment construction
L The main body of the dehydrator is a filtering device, which is composed of a fixed ring and a traveling ring, and a spiral shaft runs through it. The front section is a concentration section and the back section is a dehydration section. Quotation of stacked spiral sludge dehydrator
L The filtering gap formed between the fixed ring and the moving ring and the pitch of the screw shaft gradually decrease from the concentration part to the dehydration part.
The rotation of the screw shaft not only pushes the sludge from the concentration part to the dehydration part, but also drives the moving ring to clean the filtration gap to prevent clogging.
L sludge is gravity concentrated in the concentration department and then transported to the dehydration department. With the gradual reduction of filter gap and pitch and the blocking effect of back pressure plate, huge internal pressure is generated, and the volume is continuously reduced to achieve the purpose of full dehydration.
Dehydration principle of equipment
The main body of the stacked spiral dehydrator is a filtering device, which is stacked into a cylinder by a fixed ring and a traveling ring, and a spiral shaft runs through it. Because the inner diameter of the screw shaft is larger than that of the traveling ring, the rotation of the screw shaft drives the traveling ring to do circular motion to prevent blockage. After gravity concentration in the concentration section, the sludge is transported to the dehydration section. In the process of propulsion, as the filter gap and pitch gradually become smaller, under the blocking effect of the back pressure plate, internal pressure is generated, and the volume is continuously reduced to achieve the purpose of full dehydration.
Sludge dewatering workflow
Process description:
1. Through flocculation test, determine the matching flocculant type and dosage ratio.
2. The sludge is delivered to the sludge delivery port through the sludge delivery pump.
3. The sludge is transported to the flocculation mixing box after the flow is adjusted by the metering box, and fully stirred and mixed by the blender.
4. After being fully stirred by a blender to form larger alum flakes, they are sent into the piled snails.
5. Alumen flowers are concentrated by gravity in the concentration part, and a large amount of filtrate is discharged from the filtration gap of the concentration part. The concentrated filtrate has a low solid content and directly flows back to the original water tank.
6. The gap between the floating ring and the fixed ring of the dewatering part is narrowed, and then the pressure is further dehydrated by adjusting the back pressure plate located at the discharge port, and finally the mud cake is discharged.
L is not easy to get stuck
It has self-cleaning function. There is no need to clean the filter seam to prevent clogging, which reduces the washing water consumption and reduces the internal circulation burden.
L simple operation
Through the linkage of the electric control cabinet with the drug soaking device, sludge delivery pump and dosing pump, 24-hour continuous unmanned operation is realized; The daily maintenance time is short and the maintenance operation is simple.
L compact structure
Compact design, the dehydrator includes an electric control cabinet, a flocculation mixing box, a filtrate collecting box, a PAM stirring box and a dehydration main body; Small floor space, convenient maintenance and replacement, compact integrated box structure and reasonable design, saving space for each user.
L save engineering investment
The spiral sludge dehydrator itself has the function of sludge concentration, which can directly treat aerobic sludge in the aeration tank without concentration and storage units, thus reducing the occupied space and construction cost of all-day sewage treatment facilities.
Energy conservation and environmental protection
The rotating speed of the screw shaft is about 2-3 rpm, and the power consumption is extremely low; Less faults, less noise and vibration, and safe operation. Without secondary water pollution, the sludge runs in such a slow working state, and the odor does not spread, creating a very good operating environment.
Dewatering principle of sludge stacker
1. Dehydration: the concentrated sludge moves forward continuously with the rotation of the screw shaft; Along the outlet direction of the mud cake, the pitch of the spiral shaft decreases gradually, the gap between rings decreases gradually, and the volume of the spiral cavity continues to decrease; Under the action of the outlet back pressure plate, the internal pressure gradually rises, and the water in the sludge is squeezed out in turn under the continuous operation of the screw transmission shaft, and the solid content of the filter cake increases continuously, finally realizing the continuous dehydration of the sludge.
2. Concentration: When the spiral push shaft rotates, a plurality of fixed and movable laminations arranged on the circumference of the push shaft move relatively, and under the action of gravity, water is filtered out from the gaps between the oppositely moving laminations, thus realizing rapid concentration. Weifang Chen Yi Environmental Protection Equipment Co., Ltd. is a comprehensive service enterprise integrating scientific research, development, manufacturing, sales and installation. This is a manufacturer of stacked spiral sludge dehydrators.
3. Self-cleaning: the rotation of the screw shaft pushes the traveling ring to rotate continuously, and the equipment realizes the continuous self-cleaning process by moving between the fixed ring and the traveling ring, which skillfully avoids the common blockage problem of the traditional dehydrator.
Principle analysis of sludge accumulation mechanism
① The spiral stacking main body of the dehydrator is a filtering device formed by stacking a fixed ring and a traveling ring, and the spiral shaft passes through the traveling ring. The front section is a concentration section and the back section is a dehydration section.
② The filtering gap formed between the fixed ring and the moving ring and the pitch of the screw shaft gradually decrease from the concentration part to the dehydration part.
(3) The rotation of the screw shaft not only pushes the sludge to be transported from the concentration part to the dehydration part, but also drives the traveling ring to clean the filtration gap to prevent blockage. The extensive application and operation points of sludge stacker.
At present, with the maturity of the process, the laminated spiral sludge dehydrator has been applied to the treatment of urban sewage and industrial wastewater. The main industries have also expanded from urban domestic sewage treatment plants to slaughterhouses, food factories, chemical plants, paper mills, pharmaceutical factories, printing and dyeing plants, landfill leachate treatment plants and other industries.
Sludge dewatering is an important link in the process of sewage treatment. At present, the stacked snail sludge dehydrator is mainly used in the back end of sewage treatment to separate sludge from solids in 20% pond and concentration pond. Among them, the stacked snail sludge dehydrator system needs flocculant dosing equipment, which can directly treat sewage. Some projects are also used for pretreatment or treatment of scum scraped by air flotation machine. Before dewatering these sludge, it is necessary to master the selection of flocculant. Only by forming a good sludge dewatering effect can the normal operation of the equipment be guaranteed. Pretreatment often has the characteristics of high sludge concentration, so it is necessary to judge before doing it at present. Stacked snail sludge dehydrator is widely used. At present, a mobile stacked snail sludge dehydrator system has been added, which can treat sludge in various places more automatically and flexibly, and realize low cost and high fluidity.
(1) adopts independent technology.
The spindle adopts a self-developed variable pitch cone shaft, which increases the axial and radial bidirectional pressure of sludge during the operation of the screw shaft, and improves the dehydration rate and work efficiency.
(2) Specialized imported laser cutting and imported leveling processing technology.
The imported laser cutting and leveling technology ensures the flatness of the lamination, improves the dehydration rate of the equipment, and the moisture of the mud cake is clear after drying. Moreover, the stacked spiral sludge dehydrator will not have the phenomenon of mud leakage and mud soup (some stacked spiral sludge dehydrator manufacturers don't flatten or simply cut the laminations to save costs, so the appearance of stacked spiral sludge is the same, such as mud leakage and mud soup in actual use).
(3) Long service life of the equipment
The equipment body is made of 304 stainless steel, which is corrosion-resistant, wear-resistant and high-strength. Through scientific design, the service life can be extended to more than ten years by using full welding technology for the easily worn laminations and spindles (if the outer 304 stainless steel, inner carbon steel or 20 1 stainless steel is used, or the relatively thin 304 stainless steel plate is used, these will affect the service life).
(4) High degree of automation, saving water and electricity and reducing the cost of environmental protection projects.
Due to the low-speed screw extrusion technology, the power consumption is very low! At the same time, it is equipped with an automatic spraying system, which avoids the blockage problem and does not need a lot of water washing. Pumping out sludge, injecting liquid medicine and discharging mud cake are all controlled automatically, which can realize the effect of separating human mud and running continuously for 24 hours.
Shandong Bochuan Environmental Protection Co., Ltd., located in Weifang, the capital of kites, is one of the earliest manufacturers in China to customize the stacked snail sludge dehydrator. The company has rich engineering technology management experience and product quality management ability, perfect testing equipment, and the products are very popular. The following enterprises introduce the working process and characteristics of stacked spiral sludge dehydrator for us.
Workflow:
1. The sludge in the sludge tank is transported to the metering tank by the sludge delivery pump, and the amount of sludge is adjusted by adjusting the liquid level adjusting pipe in the metering tank, and the remaining sludge is returned to the sludge tank through the return pipe.
2. Sludge and flocculant are fully mixed in a flocculation mixing tank by a stirrer to form alum flower, and the ideal diameter of alum flower is about 5 mm ..
3. Alumen flowers are concentrated by gravity in the concentration part, and a large amount of filtrate is discharged from the filtration gap of the concentration part.
4. The concentrated sludge continues to move forward along the rotation direction of the screw shaft and is fully dehydrated under the internal pressure formed by the back pressure plate.
5. The dehydrated mud cake is discharged from the gap formed between the back pressure plate and the spiral main body. By adjusting the rotating speed of the screw shaft and the gap of the back pressure plate, the sludge treatment capacity and the moisture content of the mud cake can be adjusted. The sewage pipe of the flocculation mixing tank is only used when cleaning the mixing tank.
I. Overview
The stacked spiral body of the stacked spiral sludge dehydrator is a filtering device formed by stacking a fixed ring and a moving ring through which a spiral shaft passes. The filtering gap formed between the fixed ring and the moving ring and the pitch of the screw shaft gradually decrease from the concentration part to the dehydration part. The rotation of the screw shaft pushes the sludge from the concentration part to the dehydration part, and at the same time, it constantly drives the traveling ring to clean the filtration gap to prevent clogging.
The invention integrates a full-automatic control cabinet, a flocculation preparation tank, a sludge concentration and dehydration body and a liquid collection tank, and can realize efficient flocculation under full-automatic operation conditions, continuously complete sludge concentration and squeezing dehydration, and finally return or discharge the collected filtrate.
When the equipment is running, sludge enters the filter cartridge from the feed inlet and is pushed by the rotating blades of the screw shaft to move towards the discharge outlet. As the pitch between the rotating blades of the screw shaft gradually decreases, the pressure on the sludge is also increasing, and the sludge begins to dehydrate under the pressure difference, and water flows out from the filtration gap between the fixed plate and the movable plate. At the same time, the equipment relies on the self-cleaning function between the fixed plate and the movable plate to clean the filter gap and prevent clogging. The mud cake is fully dehydrated under the propulsion of the screw shaft and discharged from the discharge port.
Second, the scope of application
1. Spiral sludge dehydrator can be widely used in urban sewage treatment projects and water treatment systems in petrochemical, light industry, chemical fiber, paper making, pharmaceutical, leather and other industrial industries.
2. It is suitable for sludge in urban sewage, food, beverage, chemical industry, leather, welding materials, papermaking, printing and dyeing, pharmaceutical and other industries.
3. Suitable for dewatering high and low concentration sludge. When the sludge with low concentration (2000mg/L~) is dewatered, there is no need to build a concentration tank and a storage tank, which reduces the construction cost, the release of phosphorus and the generation of anaerobic smell.
Third, the structural principle.
1. concentration: when the spiral push shaft rotates, a plurality of fixed and movable laminations arranged on the circumference of the push shaft move relatively, and under the action of gravity, water is filtered out from the gaps between the oppositely moving laminations to realize rapid concentration.
2. Dehydration: the concentrated sludge moves forward with the rotation of the screw shaft; Along the outlet direction of the mud cake, the pitch of the spiral shaft decreases gradually, the gap between rings decreases gradually, and the volume of the spiral cavity continues to decrease; Under the action of the outlet back pressure plate, the internal pressure gradually increased, and the water in the sludge was squeezed out in turn under the continuous operation of the screw transmission shaft, and the solid content of the filter cake increased continuously, and finally the continuous dehydration of sludge was realized.
3. Self-cleaning: the rotation of the screw shaft pushes the traveling ring to rotate continuously, and the equipment realizes the continuous self-cleaning process by moving between the fixed ring and the traveling ring, which skillfully avoids the common blockage problem of the traditional dehydrator.
Five, equipment characteristics
1, suitable for dehydration of high and low concentration sludge. When low concentration (2000mg/L) sludge is dewatered, there is no need to build a concentration tank and a storage tank, which reduces the construction cost, the release of phosphorus and the generation of anaerobic smell.
2, no blockage, reduce washing water consumption, save water charges, and reduce the internal circulation burden caused by washing water backflow.
3. The electric control cabinet, flocculation mixing tank and dehydration main body are integrated, which reduces the occupied area and is simple and convenient to install.
4. The dehydrator is basically in a closed operation, and the treatment is stable and timely, which minimizes the odor on site and improves the working environment of workers.
5. Fully automatic 24-hour operation is realized, which reduces the labor intensity of operators.
6. The running speed of the screw shaft is low, 2-3 revolutions per minute, with low power consumption, and there is basically no vibration and noise on site.
7, the fuselage is almost entirely made of stainless steel, which can maximize the service life. Only the screw shaft and the slip ring need to be replaced, and the service life is long.
8. The daily maintenance time is short and the maintenance operation is simple.
Advantage of intransitive verbs
1. The design is compact, and the dehydrator includes an electric control cabinet, a metering box, a flocculation mixing box and a dehydrator main body.
2. The occupied space is small, which is convenient for maintenance and replacement; Light weight and easy to carry.
3. It has self-cleaning function. There is no need to clean the filter seam to prevent blockage, which reduces the washing water consumption and reduces the internal circulation burden.
4. Be good at dewatering oily sludge.
5. The fuselage is almost made of stainless steel, which can maximize the service life.
6. Only the spiral shaft and slip ring need to be replaced, and the service life is long.
7. Connect with the soaking machine, mud pump and dosing pump through the electric control cabinet. , realize 24-hour continuous unmanned operation.
8. The daily maintenance time is short and the maintenance operation is simple.