In the reclaimed water reuse process, does the biological contact oxidation process need to design a

Biological contact oxidation, also known as "submerged biological filter", "contact aeration method", "sessile activated sludge method", is a sewage treatment technology pioneered in the early 70s of the 20th century, its technical essence is to fill the filler in the biological reaction tank, and the oxygenated sewage is immersed in all the filler and flows through the filler at a certain flow rate. The filler is covered with biofilm, and the sewage is in extensive contact with the biofilm, and under the action of microbial metabolism on the biofilm, the organic pollutants in the sewage are removed and the sewage is purified.

<> primary sedimentation tank can remove sinkable matter and floating matter in wastewater. After the initial sedimentation of wastewater, about 50% of the sedimentable matter, grease and floating matter can be removed, 20% of the BOD, according to the removal of unit mass BOD or solid matter, the primary sedimentation tank is the most economical purification step, and the primary sedimentation tank is easy to use the pretreatment of the primary sedimentation tank for domestic sewage and industrial sewage with high suspended solids.

The intermediate pool is generally located in the place where the secondary lifting is required to provide water volume adjustment for the intermediate water pump.

So you should have an intermediate pool!

The meaning of the two pools is different.

The primary sink is used for pretreatment, while the intermediate pool is generally used for advanced treatment.

After biological contact oxidation treatment, sand filtration, carbon filtration, there is no intermediate pool, how can the pump pump water to achieve stable and continuous filtration?

The secondary biological contact oxidation method is a commonly used sewage treatment process, and its process characteristics are that after the first-level biological contact oxidation pond (anoxic pond), the sewage is treated by the second-level biological contact oxidation pond (aerobic pond). In the secondary biological contact oxidation tank, the treated sewage will contain a large number of suspended microorganisms and organic matter, which requires the precipitation of particulate matter to meet the discharge standards stipulated by the state.

The "medium sedimentation tank" is usually a defoaming tank for sludge sedimentation and thickening set up after the secondary biological contact oxidation tank, and the specific situation should be decided according to the actual situation. The situation of the sedimentation tank in the setup is as follows:

1.At present, the sludge content of the inlet water of the secondary biological contact oxidation tank is high, resulting in too much sludge in the tank, and when the treatment capacity is exceeded, in order to make the treatment effect meet the expectations, it is necessary to set up a medium sedimentation tank for sludge sedimentation and thickening.

2.When the outlet water of the secondary biological contact oxidation tank contains more microorganisms and organic matter, it is necessary to ensure that the concentration of suspended solids in the effluent meets the discharge standard, and a medium sedimentation tank can be set up to remove sludge.

3.When poor effluent quality factors may lead to the formation of a small amount of bubbles and oxygen foam in the secondary biological contact oxidation tank, and the foam is difficult to break, a medium sedimentation tank is also required to eliminate the foam.

In short, before setting up the sedimentation tank, it is necessary to consider a variety of factors, such as the amount of sewage, the quality of the inlet water, the water quality requirements of the effluent, etc., in order to achieve the treatment effect and eliminate the pollution.

What is the significance of sewage treatment, AO method, secondary sedimentation tank sludge reflux to tank A, most of the sludge is aerobic bacteria, reflux to tank A?

Hello, I have helped you find the result; The AO method is a sewage treatment technology that includes two pools, Pool A and Pool O. Pool A is a mixing tank that is used to treat suspended solids and organic matter in sewage, while Pool O is an aerobic tank that is used to treat organic matter in sewage. The sludge is returned to tank A, which can increase the number of green birds in tank A, thereby improving the efficiency of sewage treatment.

In addition, most of the sludge is aerobic bacteria, and the reflux into tank A can increase the aerobic bacteria in tank A, thereby improving the environmental conditions of sewage treatment. Hope mine can help you!

Summary. The advantage of separating the sewage treatment reaction tank and sedimentation tank is that it is a treatment structure that uses gravity sedimentation to remove suspended particles with a density greater than water from the water, which is one of the most widely used treatment units in wastewater treatment, which can be used for wastewater treatment, post-treatment and advanced treatment of biological treatment. The application of the sedimentation principle in the grit tank can remove the inorganic impurities in the water, the application of the sedimentation principle in the primary sedimentation tank can remove the suspended solids and other solids in the water, the application of the sedimentation principle in the secondary sedimentation tank can remove the activated sludge in the biological treatment of the water, the application of the sedimentation principle in the thickening tank to separate the water in the sludge and make the sludge concentrate, and the application of the sedimentation principle in the field of advanced treatment of the secondary sedimentation tank effluent after the flocculant coagulation reaction can remove the suspended solids in the water.

The benefits of securing the reactor and sedimentation tank separately for sewage treatment.

The advantage of separating the sewage treatment reaction tank and sedimentation tank is that it is a treatment structure that uses gravity sedimentation to remove suspended particles with a density greater than water from the water, which is one of the most widely used treatment units in wastewater treatment, which can be used for wastewater treatment, post-treatment and advanced treatment of biological treatment. The application of the sedimentation principle in the grit tank can remove the inorganic impurities in the water, the application of the sedimentation principle in the primary sedimentation tank can remove the suspended solids and other solids in the water, the application of the sedimentation principle in the secondary sedimentation tank can remove the activated sludge in the biological treatment of the water, the application of the sedimentation principle in the thickening tank to separate the water in the sludge and make the sludge concentrate, and the application of the sedimentation principle in the field of advanced treatment of the secondary sedimentation tank effluent after the flocculant coagulation reaction can remove the suspended solids in the water.

The sedimentation tank consists of five parts: water inlet area, sedimentation area, buffer zone, sludge area and effluent area. The function of the inlet area and the outlet area is to make the water flow evenly through the sedimentation tank, avoid the adverse effects of short flow and reduce turbulence on the sedimentation cattle, and at the same time reduce the dead water area and improve the volume utilization rate of the sedimentation tank; The sedimentation area is also called the clarification area, that is, the working area of the sedimentation tank, which is sufficient to separate the sedimentary particles from the wastewater; The sludge area is the area where sludge is stored, thickened and discharged; The buffer zone is the area of the water layer that separates the sedimentation zone from the sludge zone, so as to ensure that the precipitated particles do not float again due to the agitation of the water flow.

Theoretically, the shallower the tank, the easier it is for the particles to reach the bottom of the tank, which is the theoretical basis for shallow sedimentation tanks such as inclined tubes or inclined plate sedimentation tanks. In order to make the particles slightly greater than the upwelling velocity in the sedimentation tank settle down and prevent the sedimented sludge from being disturbed by the influent flow and float again, a buffer zone is left between the sedimentation area and the sludge storage area, so that the particles slightly greater than the upwelling velocity or the particles that float again in these sedimentation tanks are in contact with each other and then precipitate again.

1.If the B c value of the raw wastewater is greater than that, it is recommended to discard section A;

2.The O section of low load should be strictly controlled, and c:n:p should be appropriately adjusted to close to 100:5:1;

3.In an immediate way, the external strains increased SV30 to 20%, MLSS was controlled at 2000mg L, and SVI was controlled at 100.

The Water Department Big Spine Suspicion Classroom is officially launched!

for everyone to learn.

Regularly updated every Wednesday.

Don't forget to pay attention

What is a Biological Contact Oxidation Pond?

Biological contact oxidation tank is a kind of biofilm method, which is an aerobic biotechnology that removes pollutants such as suspended solids, organic matter, ammonia nitrogen, total nitrogen and other pollutants in sewage through the biofilm attached to the filler in the process of filling filler, sewage and all filler, and removing all fillers in the process of three-phase contact between oxygen, sewage and filler.

What are the advantages and disadvantages of biological contact oxidation ponds?

Advantages of biological contact oxidation tank: simple structure, small footprint; Low sludge production, no sludge reflux, no sludge expansion; The microbial biomass in the biofilm is stable, the biophase is abundant, and the adaptability to water quality and quantity fluctuations is strong. It is easy to operate and has less power consumption than the activated sludge method; It has a good effect on the removal of pollutants.

Deficiencies of biological contact oxidation tank: the addition of biological filler leads to high construction costs; poor controllability; The treatment effect of phosphorus is poor, and the deep phosphorus removal facilities for effluent should be built in rural areas with high requirements for total phosphorus index.

What is the scope of application of the biological contact oxidation tank?

The treatment scale of biological contact oxidation pond can be large or small, and can be built into single-household, multi-household sewage treatment facilities and village sewage treatment stations. In order to reduce the power consumption of aeration and reduce the operating cost, the terrain height difference can be used to completely or partially replace the aeration and oxygenation by using the wild imitation falling water oxygenation. If it is used as a sewage treatment facility in villages or townships, it is recommended to adopt this technology in economically developed areas, which can use electric energy aeration and oxygenation to lift rollers with high treatment effect.

REF: "Rural Sewage Treatment Policy and Knowledge Quiz".