为了探究C/N对城镇固体废物(TSW)厌氧消化的影响,建立了半连续流反应器,通过向TSW中添加不同量餐厨垃圾来调节C/N(19.1、24.6、31.2、41.8)并探究了对应的TSW产甲烷特性.结果表明:当C/N由19.1提高至24.6时,甲烷产量由328.2 mL/g增加至374.6 mL/g,然而进一步提高C/N至41.8时,甲烷产量下降至253.9 mL/g.TSW厌氧消化产甲烷的最佳C/N为24.6,此时日甲烷产量也最大,pH在6.9～7.0波动,体系中挥发性脂肪酸(VFA)含量为923～977 mg/L,这主要与产甲烷菌消耗有关.且C/N为24.6时,厌氧消化过程中体系内的蛋白酶、滤纸酶、CMC酶的活性最强.%In order to explore the effect of C/N on anaerobic digestion of town solid wastes (TSW),this experiment established a semi-continuous flow reactor,and explored the methanogenic characteristics of TSW through adjusting the C/N ratio by adding different quantity of kitchen wastes to the TSW (19.1,24.6,31.2 and 41.8) to explore the changing rule. The results showed that when the C/N increased from 19.1 to 24.6,methane production rate increased from 328.2 mL/g to 374.6 mL/g,however,when the C/N further increased as high as 41.8,methane production rate decreased to 253.9 mL/g. The optimal C/N for methane production from anaerobic digestion was 24.6,and then the daily methane production was also the largest,the pH fluctuated between 6.9 and 7.0,and the volatile fatty acid (VFA) content was 923 ～ 977 mg /L,which was the lowest in all C/N groups,and this was mainly related to the consumption of methanogens. In addition,when C/N was 24.6,the activities of protease,filter paper enzyme and CMC enzyme in anaerobic digestion process were the strongest.
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