餐厨垃圾和稻草混合产酸工艺优化提高产甲烷性能  

Optimizing Acidogenic Process for Achieving High Biomethane Yield from Anaerobic Co-digestion of Food Waste and Rice Straw Using Orthogonal Test

作　　者：陈雪[1] 袁海荣[1] 邹德勋[1] 刘研萍[1] 朱保宁[1] 李秀金[1] 

机构地区：[1]北京化工大学环境科学与工程系,北京100029

出　　处：《中国沼气》2014年第1期32-36,共5页China Biogas

基　　金：国家科技部"十一五"支撑(2011DFA90800)

摘　　要：为了考察餐厨垃圾和稻草混合的产酸及产甲烷性能,首先采用正交试验设计对影响酸化相产酸效果的4个因素即餐草比,有机负荷,酸化时间,F/M(VS/VS)比进行试验研究,然后将酸化相出料接种厌氧污泥后进行产甲烷试验。试验结果表明,当餐草比为4∶1,有机负荷为40 gVS·L-1,酸化时间为8天,F/M(VS/VS)=2∶1时,酸化相的产酸效果为最优,VFA和乙醇的总量为17200 mg·L-1,比单因素最优水平组合VFA和乙醇总量提高18%。四个因素对于VFA产量的影响依次为进料负荷﹥酸化时间﹥F/M(VS/VS)﹥餐∶草比。本次试验中,在最优的产酸工艺条件下产生的酸化出料,产甲烷性能最佳(即负荷累计产甲烷率为410.5 mL·g-1VS),系统稳定性也较好,比单因素最优水平组合甲烷产量提高11%。In order to study the performance of two-phase anaerobic co-digestion with mixed food waste （FW） and rice straw （RS） as substrate,orthogonal test was employed to optimize acidogenic phase and increase the bio-methane yield in methanogenic phase.The four investigated variables were organic loading rate （OLR）,hydratlic retention time （HRT）,feedstock to microorganism ratio （F/M）,and food waste to rice straw ratio （FW/RS）.The effluent from acidogenic digester was fed to methanogenic digester for bio-methane production.The results showed that the maximum total VFA yield of 17200 mg · L-1 in the acidogenic phase was obtained under the optimal OLR of 40 g VS· L-1,HRT of 8 days,F/M of 2∶1 （VS/VS） and FW/RS of 4∶ 1.The effects of four factors on VFA yield were OLR ＞ HRT ＞ F/M ＞ FW/RS.The highest methane yield of 410.5 mL · g-1 VS was achieved when the optimal acidified effluent was digested in methanogenic phase,and the system was stable.

关 键 词：餐厨垃圾 稻草 两相厌氧消化 正交优化 

分 类 号：S216.4[农业科学—农业机械化工程]