Effect of pH-neutralized leachate recirculation on a combined hydrolytic-aerobic biopretreatment for municipal solid waste.
Four trials with different durations (1, 2, 3 and 4 days) of neutralized leachate recirculation and a control with distilled water recirculation for 4 days were set up to investigate the effect of recirculation duration on MSW biopretreatment by a combined hydrolytic-aerobic process. Results showed that recirculation could enhance water removal and organics degradation rates and thus lead to a lower water content of biopretreated materials, when compared with the control. Recirculation with duration of 4 days had the highest rates of water removal (83.7%) and organics degradation (62.1%) and lowest final water content (43.1%) due to the elimination of acid inhibition. As a result, recirculation with duration of 4 days had the highest sorting efficiency (75%) and heating value (10570 kJ/kg) and lowest respiration activity (98.6 mgO(2)/g). Thereby, neutralized leachate recirculation with duration of 4 days was suggested to pretreat municipal solid waste with high water content.
State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai, PR China.
Dong-Qing
DQ
Zhang
Pin-Jing
PJ
He
Li-Ming
LM
Shao
D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002947:Cities; D004798:Enzymes / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D010100:Oxygen; D012037:Refuse Disposal; D013696:Temperature; D014867:Water; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
D004798:Enzymes; D014874:Water Pollutants, Chemical; D014867:Water; D010100:Oxygen