Application of combined membrane biological reactor and electro-oxidation processes for the treatment of landfill leachates

作者：Aloui Fathi; Fki Firas; Loukil Slim; Sayadi Sami^*

来源：Water Science and Technology, 2009, 60(3): 605-614.

DOI：10.2166/wst.2009.377

• detoxification
• electrochemical oxidation
• landfill leachates
• membrane biological reactor

Landfill leachate (LFL) is a very complex wastewater that poses considerable hazards to local communities and the environment. With this concern in mind, the present study was undertaken to investigate the performance of an aerobic membrane bioreactor treating raw LFL from Djebel Chekir ( Tunisia) discharge. The LFL samples collected from this site were found to be highly loaded with organic matter, ammonia, salts, greases, phenols and hydrocarbons. Important removals of chemical oxygen demand (COD) and NH(4)(+)-N were attained after 44 days of treatment at optimum conditions for the membrane and with organic loading rates (OLR) of 1.9 and 2.7 grams COD per litter and day. This treatment allowed for an important detoxification of the landfill leachates and a significant elimination of the microorganisms. Electrochemical oxidation using Pi/Ti was applied as a post-treatment and after the biological process in order to reduce the residual ammonia and COD. At a pH value of 9, current density of 4 Adm(-2) and electrolysis time of 60 minutes, COD and ammonia nitrogen were reduced to 1,000 mgL(-1) and 27 mgL(-1), respectively. COD and NH(4)(+)-N removals were accompanied by significant detoxification.

• 出版日期2009