What is the function and function of the biochemical cell in the CAST process?

The biological selection zone and the main reaction zone are separated by a partition wall, and the sewage enters the main reaction zone through the lower part of the partition wall through the biological selection zone, and the water layer rises slowly, and its structure is shown in Figure 9. In the pre-reaction zone, the microorganisms rapidly adsorb most of the soluble organic matter in the sewage through the rapid transfer mechanism of enzymes, and undergo a high-load matrix rapid accumulation process, which plays a good buffering role in the influent water quality, water quantity, pH and toxic and harmful substances, and at the same time inhibits the growth of filamentous bacteria, effectively prevents the sludge from swelling, and then undergoes a matrix degradation process with a lower load in the main reaction zone. The degradation of pollutants by the CAST process is a push-flow process in time, and the microorganisms are in the periodic change of aerobic-anoxic-anaerobic, so the CAST process has good denitrification and phosphorus removal functions.

It uses continuous water intake, and a complete operation cycle includes four steps: aeration stage, sedimentation stage, decanting stage and idle stage. The CAST process does not need a primary sedimentation tank and a secondary sedimentation tank, which has low construction cost and saves floor space.

Your sludge concentration is not high, if this is the case, your SVI should be high, then there should be filamentous bacteria, but your microscopy is not, then I can only doubt that you are doing SV30.

The main part of wastewater treatment is the use of microorganisms to degrade COD in wastewater

There are five types of biochemical treatment methods in the sewage treatment system: 1. Anaerobic tank (also known as hydrolysis acidification tank); 2. Aerobic pond (also known as aeration tank); 3. Hydrophobic pool (aerobic, anoxic and anaerobic at the same time); 4. Contact oxidation pool (also called oxidation pool, the function should be similar to that of aeration tank); 5. a bioadsorption pool; The functional goal of all biochemical tanks is to use microorganisms to degrade and decompose organic matter in the effluent.

The biochemical tank decomposes the organic matter in the sewage through the anoxic, anaerobic and aerobic processes, and removes phosphorus and nitrogen.

Biochemical treatment, divided into anaerobic and aerobic, mainly to degrade COD

The main part of wastewater treatment is the use of microorganisms to degrade the biochemical waste in the sewage.

Biochemical tanks provide wastewater treatment for a temporal procedure rather than a continuous provision of space procedures for wastewater treatment. The biochemical tank system does not need the primary sedimentation tank, the secondary sedimentation tank and the sludge return system, which is ideal for quiet sedimentation and has good separation effect. It can be used in chemical industry, petroleum, electric power, iron and steel, textile, printing and dyeing, transportation, storage, food brewing, fermentation, water treatment, seawater desalination, etc.

It is the same process, Drainage Engineering, Vol. II, Fifth Edition, p. 201. As for rural sewage, sewage treatment machines are now used in the project.

The core structure of CASS is a reaction tank, and there is no secondary sedimentation tank and sludge return equipment, and there is generally no regulating tank and primary sedimentation tank. As a result, wastewater treatment facilities are compactly arranged, occupy a small area, and have low investment. CAST process.

1. The treatment effect is good, and the effluent quality is relatively stable; 2. The purpose of denitrification and phosphorus removal can be achieved through program control; 3. Good sludge sedimentation performance; 4. It can buffer the fluctuation of inlet water quality and quantity; 5. The process is simple and the infrastructure investment is low; It is suitable for treating rural domestic sewage.

1. High efficiency in removing COD, BOD, SS, ammonia nitrogen and phosphorus.

2. It can withstand a large flow rate and organic load impact.

3. Occupy less space, low investment, good reliability and low operating cost.

4. It can effectively control the expansion of activated sludge.

5. The system is simple in composition and flexible in operation.

6 Compared with the traditional activated sludge process, the cast system produces less activated sludge, so the sludge treatment cost is relatively low. Compared with the A 0 process and the oxidation ditch process, the construction and operation costs and land area are less; The operation is simple and flexible; The treatment capacity and the ability to adapt to water quality are strong.

The main part of wastewater treatment is the use of microorganisms to degrade COD in wastewater

Anaerobic pond and aerobic biochemical pond should reserve a bundle of elastic three-dimensional filler, the upper end of the rope is tied to the guardrail of the operating platform, the packing part naturally falls into the wastewater, the lower end should not be fixed, after a period of debugging or daily operation, the packing bundle can be pulled out of the water surface to view the growth of biofilm.

Notes:

Under the hydraulic impact, the bundle filler in the anaerobic tank and the aerobic biochemical tank may occur the phenomenon of fiber bundle winding, clumping, breakage, etc., and the winding, clumping may be caused by unfavorable installation, and can appropriately increase the hydraulic load and aeration intensity to solve. The fiber bundle is broken and should be replaced in time.

At the beginning of the commissioning of the aerobic biochemical tank, the aeration volume should start from the small gas volume and gradually increase with the increase of wastewater inflow, so as to ensure that the dissolved oxygen in the wastewater of the biochemical tank is about 2 4mg l.

In the commissioning stage, the inlet and outlet water quality of the anaerobic tank and aerobic biochemical tank should be sampled and tested every week to understand the changes in water quality and grasp the growth status of biofilm.

The sewage treatment biochemical tank mainly uses microorganisms to degrade COD in sewage, which has the characteristics of high efficiency and energy saving, small footprint, impact load resistance, and convenient operation and management. Whether it is used in the treatment of industrial wastewater, aquaculture sewage and domestic sewage, it has achieved good economic benefits. --Green Ye environmental protection.

The role of the distribution well, which distributes raw water, in sewage treatment, is usually set up after the grit tank and before the biological treatment system. Collect wastewater to reduce the impact of flow changes on the treatment system.

After the sewage passes through the grit tank, it first flows to the water distribution well, and after reaching a certain capacity, the sewage is evenly distributed to the next level of structure for treatment. The function of the mixed well is similar to that of the water distribution well, which collects and mixes different sewage or adds chemicals to make the composition and concentration of the sewage relatively stable.

The installation is fast, the construction area is small, the maintenance is convenient, the service life is long, the comprehensive cost is low, the maintenance cost is less, it can be recycled, and the use cost is greatly saved; Due to the good sealing, it effectively prevents the leakage of sewage, greatly reduces the cost of sewage treatment, and thus saves a lot of energy.

It is the sump tank, which collects sewage and reduces the impact of flow changes on the treatment system. The sewage first flows to the water distribution well, reaches a certain capacity, and then the next step is to deal with it. The function of the mixer well is similar, collecting different sewage or adding chemicals to make the composition and concentration of sewage relatively stable.

The distribution well is the well in front of the sedimentation tank that provides water to the next level of water treatment structure.

The water distribution well is not only responsible for water distribution, but also for collecting sewage for the next treatment.

The node of the water distribution is not very clear, guessing, haha.