Study on engineering process and equipment operation of total treatment project of leachate and concentrated solution

Abstract

The accumulation of a large amount of leachate and concentrated liquid caused by MSW is a serious potential safety hazard and environmental hazard. A full treatment project of leachate and concentrate were performed, with treatment capacity of leachate 1100 t/d and concentrate 550 t/d. The leachate treatment process adopts “pretreatment + second-stage A/O biochemistry + ultrafiltration + chemical softening + second-stage DTRO+HPRO+RO+ ion exchange”. The main processing equipment is jet aerator, submersible mixer, centrifugal pump, ultrafiltration membrane assembly, softening membrane assembly, DT membrane column, RO system, ion exchange tank, sludge mixer, sludge dehydrator, etc. The concentrated liquid treatment process adopts “pretreatment +MVR forced circulation evaporation + triple-effect evaporation +RO+ ion exchange”. The main processing equipment is filter press, feed pump, compressor, MVR heater, circulating pump, discharge pump, original liquid pump, triple-effect evaporator, RO system, ion exchange tank, etc. The treatment results show that each indicator of external drainage meets the standard requirements of GB16889-2008 and DB37/3416.4-2018. The engineering process and equipment of the project run stably, with high recovery rate, and can properly solve the problem of concentrated liquid. So, engineering process and equipment operation of total treatment project of leachate and concentrated solution were studied, which has important reference significance for the full treatment of leachate from the national waste treatment plant.