Abstract: Using water sorted organic fraction of municipal solid waste (WS-OFMSW) as materials, pilot scale (35 L) mesophilic [(30±2)℃] middle solid batch anaerobic digestions were carried out to investigate the effects of reactor total solids (TSr 16.0%, 13.5% and 11.0%) on start-up stability and performance of anaerobic digestion. The experimental results showed that all of three TSr could start up without inhibitions of VFAs and ammonia. The "inhibited steady state" was not found. The anaerobic digestion systems had the ability of self-saving. During the period of start-up, the pH value increased gradually and then kept in neutral. The free VFAs and free ammonia concentrations were lower than 50 and 6 mg/L respectively which were lower than inhibition levels of methane production. The low TSr was favorable for rapid start-up and shortening the period of anaerobic digestion. The peaks of methane productions were found at 32, 25 and 12 d for TSr at 16.0%, 13.5% and 11.0% respectively. The lag time of start-up was10.8, 5.6 and 1.9 d.

Key words: water sorting technology, organic waste, anaerobic digestion, middle solid, start-up

摘要： 以水分选城市生活有机垃圾为原料，采用35 L厌氧反应器进行中温[(30±2)℃]批式厌氧消化，考察了反应器总固体浓度(TSr)对厌氧消化启动稳定性及启动性能的影响. 结果表明，3种TSr下(16.0%, 13.5%和11%)均能实现正常启动，没有挥发性有机酸(VFAs)和氨抑制，也未出现"抑制型稳态". 系统具有自我调节能力，启动后的系统pH值逐渐上升并维持在中性，游离VFAs和游离氨分别稳定在50和6 mg/L以下，低于产甲烷抑制浓度. 较低的TSr有助于快速启动并缩短厌氧消化周期，3种TSr的厌氧消化分别于32, 25和12 d达到产气高峰，启动延滞期分别为10.8, 5.6和1.9 d.

关键词: 水分选技术, 有机垃圾, 厌氧消化, 中固体, 启动