By: Sunny Wu(Kate@aquasust.com)
Post Date: May 27st 2021
Post Tags: Analysis Of Two Core Technologies: Activated Sludge Method And Biofilm Method
Biological treatment technology has always been the core technology of domestic sewage treatment, and it has been developed and used early in various countries. For example, the early natural treatment of septic tanks and biogas digesters belong to the category of biological treatment technology. With the effective combination of technology and technology, more and more More and more processes appear to be used, such as: AO process, A2O process, MBR process, biological aerated filter and so on. Biological treatment technology can be divided into two categories: activated sludge method and biofilm method. This article mainly introduces the difference between biofilm method and activated sludge method
Domestic sewage treatment process-activated sludge method
Activated sludge method: a biological wastewater treatment method based on aerobic biological treatment and activated sludge as the main body. Under the conditions of artificial oxygenation, the sewage and various microbial groups are continuously mixed and cultivated to form activated sludge. The biological coagulation, adsorption and oxidation of activated sludge are used to remove organic matter in rural domestic sewage.
The main components of the activated sludge method:
1.Aeration tank
2.Secondary sedimentation tank
3.Reflux system
4.Oxygen supply system
The process flow is as follows:
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Domestic sewage treatment process-biofilm method
Biofilm method: a kind of aerobic biological treatment technology parallel to the activated sludge method. The difference from the activated sludge method is the "fixation" of its biggest feature. Fillers are added to the biological reaction tank, and under the condition of oxygenation, the microorganisms The surface of the filler is adsorbed to form a biofilm. When the biofilm is completely formed, the surface is aerobic and the inside is anoxic. When the domestic sewage passes through the biofilm, the microorganisms decompose and adsorb the organic matter in the rural domestic sewage to achieve purification.
The conditions of the biofilm method in the domestic sewage treatment process are:
1. Supporting carrier-filler or filter material
2. Nutrients-organic matter, N P, etc.
3. Need to cultivate biofilm
The process model is as follows:
