Shanghai Jiaotong University sewage treatment process after the treatment of water green what causes

The current domestic sewage treatment and regeneration mainly uses pretreatment (grating or grid, regulating tank, sand sedimentation tank, etc.), biochemical treatment (A/O method, SBR, contact oxidation, etc.), and then through the two sedimentation tanks for mud-water separation, sand filtration and disinfection and then reuse; or pre-treatment by aeration biofiltration tank (set of biochemical and filtration as a whole), and then disinfection and then reuse. But the traditional sewage treatment and regeneration of sewage treatment process is generally unsatisfactory, water quality fluctuations, etc. MBR membrane bioreactor combines membrane separation technology and biochemical technology and strengthen the biochemical treatment effect, which can replace the activated sludge method in the second sedimentation tank, solid-liquid separation, greatly improve the concentration of reactor sludge, water quality is good, stable, suspended solids and turbidity is close to zero. After disinfection, it can be directly reused for miscellaneous domestic water. Therefore, this scheme proposes to use MBR membrane system to remove COD, ammonia nitrogen and other pollutants, and then reuse after disinfection. Domestic wastewater usually contains a large number of bacteria, some of which may be pathogenic, reclaimed water must be effectively disinfected before reuse, especially for miscellaneous domestic water may come into contact with human beings. Chlorine dioxide disinfection generally only acts as an oxidizing agent, not a chlorinating agent, so few DBPs (disinfection by-products, e.g., trichloromethane) are formed. Its oxidizing property is higher than chlorine and second only to ozone, and it is superior to ozone because of its residual disinfection effect. (Information from Guangzhou Chaoyu, reprinted with source) MBR membrane bioreactor effluent SS close to zero, turbidity is very small, generally less than 0.5NTU, effective chlorine directly and continuously on the microorganisms, so that the microorganisms die or lose the ability to continue to survive and reproduce, so you can ensure that the quality of the effluent water will not be on the ZhouΧ living environment caused by the Σ harmful. MBR membrane bioreactor process combines the biological treatment and membrane separation technology, and the MBR membrane bioreactor process combines the biological treatment and membrane separation technology, and the biological treatment and membrane separation technology. MBR membrane bioreactor treatment process combines biochemical treatment and membrane separation technology, and replaces the secondary sedimentation tank for solid-liquid separation, MBR wastewater treatment and traditional biochemical treatment has the following advantages: MBR membrane bioreactor can efficiently carry out the separation of sludge and water, the effluent water quality is good and stable, the effluent water suspended solids and turbidity is close to zero, and it can be directly reused.The efficient interception of MBR membrane bioreactor membrane makes microorganisms intercepted in the reactor, and realizes the hydraulic retention time of the reactor. It realizes the complete separation of hydraulic retention time (HRT) and sludge age (SRT) of the reactor, which makes the operation control more flexible and stable.The microorganism concentration in MBR membrane bioreactor is high, which can reach more than 10,000mg/liter, with high biochemical efficiency and strong shock load resistance.MBR membrane bioreactor can control long SRT, which is conducive to the interception, growth and propagation of nitrifying bacteria that proliferate slowly, and has high ammonia nitrogen removal rate. MBR membrane bioreactor membrane separation makes the large molecules in the sewage difficult to degrade components, in the volume of limited bioreactor has enough residence time, is conducive to the cultivation of specialized bacteria, easy to purify the water network () greatly improves the degradation efficiency of the degradation of non-degradable organics, COD to go out of the rate is high. Suffer from load or toxic substances impact sludge expansion, bacteria will not be lost with the water, when the incoming water quality is normal, the system can quickly return to normal work. Long sludge age, less residual sludge, greatly reducing sludge treatment costs and secondary pollution. High sludge concentration, high volumetric load, small footprint.