C/N对城镇固体废物厌氧消化产甲烷性能的影响
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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.
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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[15]邓永超,赵建伟,李小明,等.矿化垃圾对剩余污泥厌氧水解、酸化的影响[J].中国环境科学,2016,36(5):1491-1499.
[16] Zhao J,Wang D,Li X,et al. Free nitrous acid serving as a pretreatment method for alkaline fermentation to enhance shortchain fatty acid production from waste activated sludge[J]. Water Research,2015,78:111-120.
[2]谭旭娜.城市固体废弃物沼气发电系统设计[D].广州:华南理工大学,2013.
[3] Jain S,Jain S,Wolf I T,et al. A comprehensive review on operating parameters and different pretreatment methodologies for anaerobic digestion of municipal solid waste[J]. Renewable and Sustainable Energy Reviews,2015,52:142-154.
[4]曹秀芹,陈爱宁,甘一萍,等.污泥厌氧消化技术的研究与进展[J].环境工程,2008(增刊1):215-219.
[5]马磊,王德汉,谢锡龙,等.餐厨垃圾的高温厌氧消化处理研究[J].环境工程学报,2009,3(8):1509-1512.
[6] Ariunbaatar J,Panico A,Esposito G,et al. Pretreatment methods to enhance anaerobic digestion of organic solid waste[J]. Applied energy,2014,123:143-156.
[7] Kamali M,Gameiro T,Costa M E V,et al. Anaerobic digestion of pulp and paper mill wastes-An overview of the developments and improvement opportunities[J]. Chemical Engineering Journal,2016,298:162-182.
[8]王明.生物质组成成分对厌氧发酵产甲烷的影响[D].哈尔滨:东北农业大学,2015.
[9]史宏伟,邹德勋,左剑恶,等.原料差异对厌氧消化微生物群落的影响[J].农业环境科学学报,2011,30(8):1675-1682.
[10] Dhar H,Kumar P,Kumar S,et al. Effect of organic loading rate during anaerobic digestion of municipal solid waste[J]. Bioresource Technology,2016,217:56-61.
[11] Zhang Q, He J, Tian M, et al. Enhancement of methane production from cassava residues by biological pretreatment using a constructed microbial consortium[J]. Bioresource Technology,2011,102(19):8899-8906.
[12] Zhao J,Yang Q,Li X,et al. Effect of initial pH on short chain fatty acid production during the anaerobic fermentation of membrane bioreactor sludge enhanced by alkyl polyglcoside[J].International Biodeterioration&Biodegradation,2015,104:283-289.
[13] Dang Y,Sun D,Woodard T L,et al. Stimulation of the anaerobic digestion of the dry organic fraction of municipal solid waste(OFMSW)with carbon-based conductive materials[J].Bioresource Technology,2017,238:30-38.
[14]段妮娜,董滨,戴翎翎,等.有机固体废弃物高含固厌氧消化的研究与应用[J].环境工程,2016,34(9):119-124.
[15]邓永超,赵建伟,李小明,等.矿化垃圾对剩余污泥厌氧水解、酸化的影响[J].中国环境科学,2016,36(5):1491-1499.
[16] Zhao J,Wang D,Li X,et al. Free nitrous acid serving as a pretreatment method for alkaline fermentation to enhance shortchain fatty acid production from waste activated sludge[J]. Water Research,2015,78:111-120.