Experimental Study on the Concentrated Filtrate from Membrane Filtration of “Middle-Aged and Aged” Leachate by Coagulation and Micro-Electrolysis

"Middle aged and aged" landfill leachate has the characteristics of high ammonia nitrogen concentration and poor biodegradability. The concentrated liquid of leachate membrane from middle-aged and elderly garbage is a high concentration organic wastewater generated in landfill sites. This type of wastewater usually comes from the decomposition and filtration process of elderly garbage in landfills. Due to the long-term decomposition and stabilization process of organic matter in elderly garbage, the concentration of organic matter in its leachate is high, and it contains some difficult to degrade substances. However, the concentrated liquid after membrane filtration is more difficult to treat because of its own poor biochemical properties. For "middle aged" leachate membrane filtration concentrate, it is advisable to retreat by physicochemical method to reduce organic load and improve biodegradability before returning to the biochemical system for treatment. The combined process of coagulation and enhanced micro-electrolysis was used in this experiment, and the best operating parameters were studied.