Biological nitrogen removal from landfill leachate using anaerobic-aerobic process: Denitritation via organics in raw leachate and intracellular storage polymers of microorganisms

摘要

A system which combined ASBR with pulsed SBR (PSBR) was introduced to enhance COD and nitrogen removal from the real landfill leachate. ASBR was used to degrade the organics from raw leachate mainly. Three equal feeds mode was applied in PSBR operation. The results obtained from the joint operation period (157days) show that the COD removal rate of ASBR was 83-88% under the specific loading rate of 0.43-0.62gCODgVSS~(-1)day~(-1). PSBR's operation can be divided into four phases according to the different influent NH_4 ~+-N which increased to 800-1000mgL~(-1) finally, and total nitrogen (TN) removal rate of more than 90% with the effluent TN of less than 40mgL~(-1) was obtained. PHB and glycogen can act as electron donor for endogenous denitritation orderly with the hypothetical function from DNGAOs. Consequently, the system achieved COD and TN removal rate of 89.61-96.73% and 97.03-98.87%, respectively, without any extra carbon source addition.