Parameter optimization and technology comparison for landfill leachate treatment
垃圾渗滤液处理工艺运行参数优化与技术比较

Landfill leachate is a high-strength wastewater that may contain high concentrations of organic and inorganic matter.In this study,the operating parameters and removal efficiency for COD and ammonia nitrogen (NH4+-N) were compared for two different treatment chains and operating parameters at the Liulitun landfill leachate system during 2007 and 2010.In 2007,before improvement,the removal of COD and NH4+-N in the treatment chain of a mesophilic UASB+A/O+flocculation were 62%~97% and 18%~74%,respectively.The process was changed by reducing the hydraulic retention time by 1/3,adjustment of A/O aeration method,optimization of operating parameters such as pH and DO,and by replacing the flocculant used by MBR.Over a period of 1 year,these changes resulted in a COD removal of 81%~99%,and NH4+-N removal of 99.5%.The effluent content of NH4+-N was less than 10 mg/L.These results indicate that optimization of UASB+A/O+MBR processes can have a profound effect on system performance allowing shorter treatment periods and easy management while substantially reducing COD and NH4+-N.