Method for realizing synchronous denitrification in membrane bioreactor

Abstract

The invention relates to a method for realizing synchronous denitrification in a membrane bioreactor, which belongs to the technical field of biological wastewater treatment. In the method, high ammonia nitrogen ratio wastewater or low carbon nitrogen ratio wastewater is used as a treatment object, slow-growing anaerobic ammonium oxidation (anammox) bacteria are cultivated in an external MBR, the loss of sludge with effluent is prevented to a maximum degree, the starting time is shortened, corresponding operating parameters are provided; the starting time of the bioreactor can be shortened to 87days, the sludge concentration of an anammox denitrification process in the external MBR is up to 12.7 to 14.8 g / L, the sludge color is changed into red brown from black, the total nitrogen removal rate is between 50 and 82 percent, the NH4<+>-N removal rate is between 46 and 92 percent, the NO2<->-N removal rate is between 63 and 92 percent and the membrane flux of stable operation is between 2.5 to 5.8 L / (m2.h). The method has less investment, low operating cost, high stability, low yield of residual sludge, superior effluent quality and a high theoretical value and can be applied in engineering practice.

Description

technical field

[0001] A method for realizing synchronous denitrification in a membrane bioreactor (Membrane Bioreactor, MBR), which relates to a high ammonia nitrogen or low carbon nitrogen ratio wastewater in the MBR to carry out anaerobic ammonium oxidation (ANaerobic AMMonium OXidation, Anammox) process startup and The research on operating conditions belongs to the technical field of wastewater biological treatment. Background technique

[0002] For the removal of ammonia nitrogen pollution in industrial and domestic sewage, the traditional method is to use a biological method that combines nitrification and denitrification. This method is suitable for the treatment of sewage with abundant biochemically usable carbon sources, but it has poor biochemical properties or high ammonia nitrogen concentration. High or low carbon nitrogen ratio sewage, such as landfill leachate and sludge digestion effluent from sewage treatment plants, in order to ensure a high nitrogen remova...