Kinetic modeling and microbiological study of two-step nitrification in a membrane bioreactor and hybrid moving bed biofilm reactor-membrane bioreactor for wastewater treatment

摘要

A membrane bioreactor (MBR), a hybrid moving bed biofilm reactor-membrane bioreactor (MBBR-MBR) containing carriers in the anoxic and aerobic zones of the bioreactor and a hybrid MBBR-MBR which contained carriers only in the aerobic zone were used in parallel with the same urban wastewater and compared. The reactors operated with a hydraulic retention time (HRT) of 9.5 h. Kinetic parameters for heterotrophic and autotrophic biomasses, mainly ammonium-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), were evaluated and related to organic matter and nutrients removals. The microbial communities of each wastewater treatment plant (WWTP) were analyzed by 454 pyrosequenc-ing methods to detect and quantify the contribution of nitrifying bacteria in the total bacterial community.