摘要
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 m L/g to374. 6 m L/g,however,when the C/N further increased as high as 41. 8,methane production rate decreased to 253. 9 m L/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 was24. 6,the activities of protease,filter paper enzyme and CMC enzyme in anaerobic digestion process were the strongest.
引文
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