Experimental Study Of Optimum Operating Condition On Landfill Leachate Treated By Anaerobic Sequencing Batch Reactor

Contamination of leachate from landfill which may trigger polution is one of the major environmental problems, effective leachate treatment is the inevitable requirement of garbage harmless. In the current leachate treatment process, anaerobic pretreatment is one of the key links.This paper has carried out experiental study that used the anaerobic sequencing batch reactor (ASBR) on landfill leachate pretreatment which is rising in recent years.On the base of comparative effectiveness research using ASBR of medium temperature and normal atmospheric temperature under domestication.this paper studied the optimal conditions for different temperature ASBR treating leachate,so the research results can provide references and draw lessons for the similar technology of treating leachate in landfill.The start-up test of reactor has showed that volume load of reactor achieves up to2.4kgCOD/(m3·d) under the medium temperature and normal atmospheric temperature, in which tha COD removal efficiency under the medium temperature is stable in96%, another COD removal efficiency under the normal atmospheric temperature is stable in93%, effluent VFA and pH values are stable at200mg/L and7.7. It has been showed that ASBR could get better domestication effects using mixed water from leachate and domestic sewage and reducing the frequency and intensity of stirring..The operating parameters experimental study indicated that, the most suitable system volume loading was2.55kgCOD/(m3·d),the most suitable reaction cycle in the mesophilic ASBR was36hours, the most suitable mixing frequency was2min/h. The orthogonal test shows that in the mesophilic ASBR the determination of the Optimum operating conditions were the reaction time36h, mixing frequency2min/2h, the system volume loading2.98kgCOD/(m3·d),at the moment, the COD removal efficiency was96%in the mesophilic ASBR.In the normal temperature ASBR, the determination of the Optimum operating conditions were the reaction time48h, mixing frequency2min/2h, the system volume loading2.13kgCOD/(m3·d),at the moment, the COD removal efficiency was93%in the normal temperature ASBR.The paper not only provides reference for the stability of landfill leachate Treatment compliance, but also promote the in-depth study on anaerobic sequencing batch reactor at high-concentration organic wastewater.