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Preceding pretreatment mainly physico-chemical treatment, including grille Cleaner, mix thoroughly, coagulation sedimentation and other structures, mainly to remove the grille fabric waste water, hair and other bulk material, strip material; regulation of water and mix thoroughly by the pool, mix thoroughly water quality and reduce water temperature; then enter microelectrolysis tower, waste water electrolysis principle is very simple, is the use of iron - carbon particles exist between the potential difference and the formation of numerous tiny primary battery. These tiny battery is low potential corrosion of iron and an anode, a cathode potential of high carbon do occur in an aqueous solution containing an acidic electrolyte in the electrochemical reaction. Result of the reaction is corroded iron into divalent iron ions into the solution. Domestic electrolytic reactor effluent adjust the PH value to about 9, since the iron ions and hydroxide role in the formation of ferrous hydroxide having a coagulation, which is weakly negatively charged particles and pollutants opposites attract in the band, formed Compare floe (also called iron sludge) is removed.
Coagulating sedimentation can effectively remove most of the water suspension and colloidal dye, while the removal of heavy metal ions in wastewater, chromaticity. Avoid subsequent biological treatment facilities dampen, reduce the subsequent processing facility operating load.
Follow-up to enter the pool acid hydrolysis, and the inflow of raw sewage into the synchronization from the secondary settling tank sludge reflux of phosphorus, this pool is the main function of phosphorus release, the sewage of P concentration, dissolved organic matter is absorbed leaving the microbial cells effluent BOD concentration decreased; in addition, NH3-N synthesis by cells are removed part of the sewage in the NH3-N concentration decreased, but the NO3-N content did not change.
And oxygen in the tank, denitrifying bacteria use organic matter in sewage as the carbon source, reflux mixture into a large number of NO3-N and NO2-N is reduced to N2 is released into the air, and therefore decrease the concentration of BOD5, NO3-N concentration significant decline, while phosphorus is small change.
In the aerobic tank, biochemical microbial degradation of organic matter, and continue to decline; organic amide nitrogen is then nitrated to make significant decrease NH3-N concentration, but with the nitrification process so that an increase in the concentration of NO3-N, P with poly excessive intake of phosphorus bacteria, but also a faster rate of decline. So, A2 / O process it can be done at the same time removal of organic matter, excessive intake of denitrification and phosphorus are removed and other functions, provided that denitrification is NH3-N should complete nitrification, aerobic tank can accomplish this function, the lack of nitrogen and oxygen pool complete the function. Combined anaerobic tank and aerobic tank complete Phosphorus.