Brief Introduction of Biological Contact Oxidation

The biological contact oxidation method is one of the main facilities of the biofilm method. The biofilm method is a general term for a large class of biological treatment methods. method. Biofilm is an ecosystem composed of highly dense aerobic bacteria, anaerobic bacteria, facultative bacteria, fungi, protozoa and algae, etc. The solid medium attached to it is called filter material or carrier. The biofilm can be divided into aerobic layer, aerobic layer, attached water layer and moving water layer from the filter material outward. The principle is that the biofilm first adsorbs the organic matter attached to the water layer, which is decomposed by the aerobic bacteria in the aerobic layer, and then enters the anaerobic layer for anaerobic decomposition, and the flowing water layer washes away the aging biofilm to grow a new biofilm. , so as to achieve the purpose of purifying sewage. The aging biofilm is constantly falling off, and is removed by the secondary precipitation with the inflow of water.

The treatment structure of the biological contact oxidation method is a submerged aerated biological filter, also known as a biological contact oxidation tank. The biological contact oxidation tank is equipped with fillers, the fillers are submerged in the wastewater, and the fillers are covered with biofilms. During the contact between the wastewater and the biofilms, the organic matter in the water is adsorbed, oxidatively decomposed and transformed into new biofilms by microorganisms. The biofilm falling off the filler is removed after flowing to the secondary sedimentation tank with the water, and the wastewater is purified. In the contact oxidation pond, the oxygen required by the microorganisms comes from the water, and the waste water continuously replenishes the lost dissolved oxygen from the bubbling air. The air enters the water flow through the perforated air distribution pipe at the bottom of the pool. When the bubbles rise, oxygen is supplied to the waste water, and sometimes it is used to return the pool water.

The characteristics of biological contact oxidation method:

  1. Due to the large specific surface area of ​​the filler, the oxygenation conditions in the pool are good. The amount of biological solids per unit volume in the biological contact oxidation tank is higher than that of the activated sludge aeration tank and the biological filter, so the biological contact oxidation tank has a higher volume load;
  2. The biological contact oxidation method does not require sludge backflow, so there is no sludge bulking problem, and the operation and management are simple;
  3. Due to the large amount of biological solids and the completely mixed water flow, the biological contact oxidation tank has strong adaptability to sudden changes in water quality and quantity;
  4. When the organic volume load of the biological contact oxidation tank is high, its F/M is kept at a low level, and the sludge production is less

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Further reading:

MBBR living waste water

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