The biochemical methane potentials for typical fruit and vegetable waste （FVW） and food waste （FW） from a northern China city were investigated, which were 0.30, 0.56 m3 CH4/kgVS （volatile solids） with biodegrad...The biochemical methane potentials for typical fruit and vegetable waste （FVW） and food waste （FW） from a northern China city were investigated, which were 0.30, 0.56 m3 CH4/kgVS （volatile solids） with biodegradabilities of 59.3% and 83.6%, respectively. Individual anaerobic digestion testes of FVW and FW were conducted at the organic loading rate （OLR） of 3 kg VS/（m3-day） using a lab-scale continuous stirred-tank reactor at 35°C. FVW could be digested stably with the biogas production rate of 2.17 ma/（m3-day） and methane production yield of 0.42 m3 CH4/kg VS. However, anaerobic digestion process for FW was failed due to acids accumulation. The effects of FVW： FW ratio on co-digestion stability and performance were further investigated at the same OLR. At FVW and FW mixing ratios of 2：1 and 1：1, the performance and operation of the digester were maintained stable, with no accumulation of volatile fatty acids （VFA） and ammonia. Changing the feed to a higher FW content in a ratio of FVW to FW 1：2, resulted in an increase in VFAs concentration to 1100-1200 rag/L, and the methanogenesis was slightly inhibited. At the optimum mixture ratio 1：1 for co-digestion of FVW with FW, the methane production yield was 0.49 m3 CH4/kg VS, and the volatile solids and soluble chemical oxygen demand （sCOD） removal efficiencies were 74.9% and 96.1%, respectively.展开更多
为了提高北方地区玉米秸秆与牛粪的厌氧发酵产气效果,试验将秸秆与畜禽粪便混合来进行厌氧发酵研究。采用总固体(TS)质量分数为20%的发酵工艺,在35℃的条件下分别研究了玉米秸秆与猪粪、鸡粪、牛粪;牛粪与玉米秸秆、水稻秸秆、大豆秸秆...为了提高北方地区玉米秸秆与牛粪的厌氧发酵产气效果,试验将秸秆与畜禽粪便混合来进行厌氧发酵研究。采用总固体(TS)质量分数为20%的发酵工艺,在35℃的条件下分别研究了玉米秸秆与猪粪、鸡粪、牛粪;牛粪与玉米秸秆、水稻秸秆、大豆秸秆混合厌氧发酵的产气效果,探讨原料的混合及配比对产气效果的影响。原料混合发酵可显著提高总产气量、产气速率。在玉米秸秆与不同粪便的混合发酵研究中,玉米秸秆和鸡粪以1∶2配比产气效果最好,产气率为309 m L·g-1TS;在牛粪与不同秸秆的混合发酵研究中,牛粪和玉米秸秆以3∶1配比产气效果最好,产气率为273 m L·g-1TS。确定了玉米秸秆与不同粪便及牛粪与不同秸秆混合厌氧发酵的最适混合及配比,为提高厌氧发酵的产气效果提供了依据。展开更多
采用批次及批次与半连续耦合的发酵方法,35℃条件下,研究了稻秸与餐厨垃圾、人粪尿混合物(简称生活污水,下文同)的不同混合比例以及生活污水不同负荷对稻秸产沼气性能及污水中粪大肠菌群去除率的影响。结果表明:在发酵总固体浓度(TS)为...采用批次及批次与半连续耦合的发酵方法,35℃条件下,研究了稻秸与餐厨垃圾、人粪尿混合物(简称生活污水,下文同)的不同混合比例以及生活污水不同负荷对稻秸产沼气性能及污水中粪大肠菌群去除率的影响。结果表明:在发酵总固体浓度(TS)为16%条件下,稻秸与生活污水混合比例为1∶1.72(W/W)时,稻秸TS产气量达到377 mL/g,比稻秸与生活污水比为1∶3.44的处理高7.71%,比单一稻秸高24.42%;在稻秸TS浓度为10%条件下,生活污水有机负荷(OLR)从0.5 g COD/(L.d)逐步提高到4.0 g COD/(L.d),其厌氧发酵系统运行正常,与单一稻秸发酵相比,容积产气效率提高,且沼气中甲烷含量提高近20%,与单一生活污水厌氧发酵相比,生活污水COD去除率基本一致,均超过80%,但是随着污水有机负荷的增加,粪大肠菌群去除率由99.4%下降到了86.0%,出水中粪大肠菌群未达到国家允许的1×104个/mL排放标准。展开更多
基金supported by the Ministry of Science and Technology of China (No. 2008BADC4B16, 2008BADC4B18,2008AA062401)
文摘The biochemical methane potentials for typical fruit and vegetable waste （FVW） and food waste （FW） from a northern China city were investigated, which were 0.30, 0.56 m3 CH4/kgVS （volatile solids） with biodegradabilities of 59.3% and 83.6%, respectively. Individual anaerobic digestion testes of FVW and FW were conducted at the organic loading rate （OLR） of 3 kg VS/（m3-day） using a lab-scale continuous stirred-tank reactor at 35°C. FVW could be digested stably with the biogas production rate of 2.17 ma/（m3-day） and methane production yield of 0.42 m3 CH4/kg VS. However, anaerobic digestion process for FW was failed due to acids accumulation. The effects of FVW： FW ratio on co-digestion stability and performance were further investigated at the same OLR. At FVW and FW mixing ratios of 2：1 and 1：1, the performance and operation of the digester were maintained stable, with no accumulation of volatile fatty acids （VFA） and ammonia. Changing the feed to a higher FW content in a ratio of FVW to FW 1：2, resulted in an increase in VFAs concentration to 1100-1200 rag/L, and the methanogenesis was slightly inhibited. At the optimum mixture ratio 1：1 for co-digestion of FVW with FW, the methane production yield was 0.49 m3 CH4/kg VS, and the volatile solids and soluble chemical oxygen demand （sCOD） removal efficiencies were 74.9% and 96.1%, respectively.
文摘为了提高北方地区玉米秸秆与牛粪的厌氧发酵产气效果,试验将秸秆与畜禽粪便混合来进行厌氧发酵研究。采用总固体(TS)质量分数为20%的发酵工艺,在35℃的条件下分别研究了玉米秸秆与猪粪、鸡粪、牛粪;牛粪与玉米秸秆、水稻秸秆、大豆秸秆混合厌氧发酵的产气效果,探讨原料的混合及配比对产气效果的影响。原料混合发酵可显著提高总产气量、产气速率。在玉米秸秆与不同粪便的混合发酵研究中,玉米秸秆和鸡粪以1∶2配比产气效果最好,产气率为309 m L·g-1TS;在牛粪与不同秸秆的混合发酵研究中,牛粪和玉米秸秆以3∶1配比产气效果最好,产气率为273 m L·g-1TS。确定了玉米秸秆与不同粪便及牛粪与不同秸秆混合厌氧发酵的最适混合及配比,为提高厌氧发酵的产气效果提供了依据。
文摘采用批次及批次与半连续耦合的发酵方法,35℃条件下,研究了稻秸与餐厨垃圾、人粪尿混合物(简称生活污水,下文同)的不同混合比例以及生活污水不同负荷对稻秸产沼气性能及污水中粪大肠菌群去除率的影响。结果表明:在发酵总固体浓度(TS)为16%条件下,稻秸与生活污水混合比例为1∶1.72(W/W)时,稻秸TS产气量达到377 mL/g,比稻秸与生活污水比为1∶3.44的处理高7.71%,比单一稻秸高24.42%;在稻秸TS浓度为10%条件下,生活污水有机负荷(OLR)从0.5 g COD/(L.d)逐步提高到4.0 g COD/(L.d),其厌氧发酵系统运行正常,与单一稻秸发酵相比,容积产气效率提高,且沼气中甲烷含量提高近20%,与单一生活污水厌氧发酵相比,生活污水COD去除率基本一致,均超过80%,但是随着污水有机负荷的增加,粪大肠菌群去除率由99.4%下降到了86.0%,出水中粪大肠菌群未达到国家允许的1×104个/mL排放标准。
