低温热水解污泥厌氧产甲烷过程研究
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摘要
为了促进剩余污泥(WAS)的厌氧降解转化,本文在50～110℃温度下,对WAS进行热水解,考察热水解污泥的厌氧产气效能。粒径、溶解性蛋白和多糖、磷酸盐等指标的分析结果表明,低温热水解能有效破坏WAS的絮体结构,促进有机物释放。110℃处理2h后,WAS粒径从208.9μm降低至10.8μm,相应的溶解性化学需氧量(SCOD)浓度提高3.29倍。此外,生物气产量随热水解温度的升高而升高,最大累积生物气产量比对照组提高34.1%,且CH_4和H_2含量合计可达81.8%。
In order to promote the anaerobic degradation and transformation of waste activated sludge(WAS), in this study, the WAS was treated at thermal hydrolysis of 50～110℃, simultaneously, the biogas production of thermal hydrolysis WAS was observed. The particle size,soluble proteins and polysaccharides and phosphate were analyzed. The results indicated that the floc structure was destroyed efficiently, and the organic substances in the WAS were released. The particle size decreased from 208.9μm to 10.8μm, and the corresponding SCOD concentration increased by 3.29 times when the WAS was treated at 110℃ for 2 h. Simultaneously, the biogas production increased with the increase of the thermal hydrolysis temperature, and the maximum cumulative biogas production increased by 34.1% compared with control test, and the corresponding contents of CH4 and H2 reached 81.8%.
In order to promote the anaerobic degradation and transformation of waste activated sludge(WAS), in this study, the WAS was treated at thermal hydrolysis of 50～110℃, simultaneously, the biogas production of thermal hydrolysis WAS was observed. The particle size,soluble proteins and polysaccharides and phosphate were analyzed. The results indicated that the floc structure was destroyed efficiently, and the organic substances in the WAS were released. The particle size decreased from 208.9μm to 10.8μm, and the corresponding SCOD concentration increased by 3.29 times when the WAS was treated at 110℃ for 2 h. Simultaneously, the biogas production increased with the increase of the thermal hydrolysis temperature, and the maximum cumulative biogas production increased by 34.1% compared with control test, and the corresponding contents of CH4 and H2 reached 81.8%.
引文
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[5]李孟,章蕾,张倩,等.污泥高温热水解预处理的影响条件及机理研究[J].武汉理工大学学报,2013,35(10):115-119.
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[9]I.Ferrer, S.Ponsá, F.Vázquez, et al. Increasing biogas production by thermal(70℃)sludge pre-treatment prior to thermophilic anaerobic digestion[J]. Biochemical Engineering Journal, 2008, 42(2):186-192.
[10]魏复盛,国家环境保护总局,《水和废水监测分析方法》编委会.水和废水监测分析方法[M].北京:中国环境科学出版社,2002.
[11]O.H.Lowry, N.J.Rosebrough, A.L.Farr, et al. Protein measurement with the Folin phenol reagent[J]. Journal of Biological Chemistry, 1951, 193(1):265-275.
[12]D.Herbert, P.J.Philipps, R.E.Strange. Carbohydrate analysis[J]. Methods Enzymol B, 1971(5):265-277.
[13]刘亚利.剩余污泥强化预处理及其厌氧产酸产甲烷研究[D].哈尔滨:哈尔滨工业大学,2015.
[14]孙德栋,马妮娜,郭思晓,等.微波联合活性炭纤维处理剩余污泥的研究[J].环球科学与技术,2011,34(8):143-146.
[15]D.H. Kim, S.K. Cho, M.K. Lee, M.S. Kim. Increased solubilization of excess sludge does not always result in enhanced anaerobic digestion efficiency[J]. Bioresource Technology,2013, 143:660-664.
[2]傅木星,张砺彦,苏泱洲,等.不同预处理方法对剩余污泥厌氧发酵产氢的影响[J].安全与环境学报,2015,15(1):273-276.
[3]W.G.Jie, Y.Z.Peng, N.Q.Ren, et al. Volatile fatty acids(VFAs)accumulation and microbial community structure of excess sludge(ES)at different pHs[J]. Bioresource Technology,2014, 152:124-129.
[4]H.N.Gavala, U.Yenal, I.V.Skiadas, et al. Mesophilic and thermophilic anaerobic digestion of primary and secondary sludge. Effect of pre-treatment at elevated temperature[J].Water Research, 2003, 37(19):4561-4572.
[5]李孟,章蕾,张倩,等.污泥高温热水解预处理的影响条件及机理研究[J].武汉理工大学学报,2013,35(10):115-119.
[6]A.Shana, S.Ouki, M.Asaadi, et al. The impact of intermediate thermal hydrolysis on the degradation kinetics of carbohydrates in sewage sludge[J]. Bioresource Technology, 2013,137:239-244.
[7]吴静,姜艳,曹知平,等.剩余污泥低温热水解中试[J].清华大学学报(自然科学版),2015,55(1):93-97.
[8]E.S.M. Borges, C.A.L. Chernicharo. Effect of thermal treatment of anaerobic sludge on the bioavailability and biodegradability characteristics of the organic fraction[J].Brazilian Journal of Chemical Engineering, 2009, 26(3):469-480.
[9]I.Ferrer, S.Ponsá, F.Vázquez, et al. Increasing biogas production by thermal(70℃)sludge pre-treatment prior to thermophilic anaerobic digestion[J]. Biochemical Engineering Journal, 2008, 42(2):186-192.
[10]魏复盛,国家环境保护总局,《水和废水监测分析方法》编委会.水和废水监测分析方法[M].北京:中国环境科学出版社,2002.
[11]O.H.Lowry, N.J.Rosebrough, A.L.Farr, et al. Protein measurement with the Folin phenol reagent[J]. Journal of Biological Chemistry, 1951, 193(1):265-275.
[12]D.Herbert, P.J.Philipps, R.E.Strange. Carbohydrate analysis[J]. Methods Enzymol B, 1971(5):265-277.
[13]刘亚利.剩余污泥强化预处理及其厌氧产酸产甲烷研究[D].哈尔滨:哈尔滨工业大学,2015.
[14]孙德栋,马妮娜,郭思晓,等.微波联合活性炭纤维处理剩余污泥的研究[J].环球科学与技术,2011,34(8):143-146.
[15]D.H. Kim, S.K. Cho, M.K. Lee, M.S. Kim. Increased solubilization of excess sludge does not always result in enhanced anaerobic digestion efficiency[J]. Bioresource Technology,2013, 143:660-664.