Approach
3.Biological treatment
Through the metabolism of microorganisms, the wastewater, which is a solution, a colloid and a micro-suspended organic pollutant, is converted into a stable and harmless substance wastewater treatment method. According to the different microorganisms, the biological treatment method can be divided into two types: aerobic biological treatment and anaerobic biological treatment.
Aerobic biological treatment is widely used in biological treatment of wastewater. According to the tradition, aerobic biological treatment is divided into two types: activated sludge method and biofilm method. The activated sludge process itself is a processing unit that operates in a variety of ways. The processing equipment belonging to the biofilm method includes a biological filter, a biological turntable, a biological contact oxidation tank, and a biological fluidized bed. The biological oxidation pond method is also called the natural biological treatment method. The anaerobic biological treatment method, also known as the biological reduction treatment method, is mainly used for treating high-concentration organic wastewater and sludge. The processing equipment used is mainly the digester.
The wastewater is treated by the biological contact oxidation method, that is, the biological reaction tank is filled with the filler by the biological contact oxidation process, and the oxygenated sewage is immersed in the entire 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. Under the action of microbial metabolism on the biofilm, the organic pollutants in the sewage are removed and the sewage is purified. Finally, the treated wastewater is discharged into the biological contact oxidation treatment system and mixed with domestic sewage for treatment, and discharged after chlorine disinfection. The biological contact oxidation method is a biofilm process between the activated sludge process and the biological filter, which is characterized in that a filler is arranged in the pool, the bottom aeration of the pool is used to oxygenate the sewage, and the sewage in the pool is in a flow. The state is to ensure that the sewage is fully contacted with the filler immersed in the sewage, and the defect of uneven contact between the sewage and the filler in the biological contact oxidation pond is avoided, and the aeration device is called blast aeration.
The microbial fuel cell processing method utilizes microorganisms degrading waste inoculated in a fuel cell to degrade toxic substances, organic substances and impurities. Common microbial fuel cells can be divided into: single-chamber microbial fuel cells, dual-chamber microbial fuel cells.