秸秆发酵液作污水反硝化脱氮外加碳源的潜能研究
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摘要
为解决污水处理中碳源不足的问题,采用稻草、玉米秸秆在25、35、55℃下厌氧发酵,以COD/TN分别为4、6、8添加发酵液作外加碳源,探讨其反硝化脱氮效果。结果表明:稻草、玉米秸秆发酵的最佳温度均为35℃;稻草、玉米秸秆发酵液的碳源投加量均在COD/TN为6时脱氮率最佳,分别为80.1%、97.3%。综上所述,秸秆发酵液是一种有潜能的优质碳源。
In order to solve the problem of insufficient carbon source in sewage treatment,anaerobic fermentation of rice straw and corn stalk were carried out at 25,35,55 ℃ and the denitrification efficiency in water was investigated by adding the fermentation liquid as an external carbon source according to COD/TN ratios of 4,6,8 respectively. The results showed that the optimum fermentation temperature of rice straw and corn stalk were both at 35 ℃. The optimum amounts of the two straws fermentation liquid added were both at COD/TN of 6. The removal rates of nitrate nitrogen for rice straw and corn stalk were 80.1% and 97.3%,respectively. In summary,the fermentation liquid of straws is an excellent external carbon source candidate.
In order to solve the problem of insufficient carbon source in sewage treatment,anaerobic fermentation of rice straw and corn stalk were carried out at 25,35,55 ℃ and the denitrification efficiency in water was investigated by adding the fermentation liquid as an external carbon source according to COD/TN ratios of 4,6,8 respectively. The results showed that the optimum fermentation temperature of rice straw and corn stalk were both at 35 ℃. The optimum amounts of the two straws fermentation liquid added were both at COD/TN of 6. The removal rates of nitrate nitrogen for rice straw and corn stalk were 80.1% and 97.3%,respectively. In summary,the fermentation liquid of straws is an excellent external carbon source candidate.
引文
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[2]罗哲,周光杰,刘宏波,等.污泥厌氧产酸发酵液作碳源强化污水脱氮除磷中试研究[J].环境科学,2015,36(3):1000-1005.
[3]刘晔,王淑莹,袁悦,等.剩余污泥厌氧发酵混合物提高低C/N污水处理效果[J].农业工程学报,2016,32(8):206-211.
[4] Murali N,Fernandez S,Ahring B K. Fermentation of wet-exploded corn stover for the production of volatilefatty acids[J]. Bioresource Technology,2017,227:197-204.
[5]邵留,徐祖信,金伟,等.以稻草为碳源和生物膜载体去除水中的硝酸盐[J].环境科学,2009(5):1414-1419.
[6]孙雅丽,张国臣,阎中,等.以腐朽木为碳源去除废水中硝酸盐氮的研究[J].环境科学,2010,31(6):1494-1498.
[7]龙建兵,顾向阳.乳酸作为EBPR进水碳源的可行性研究[J].南京农业大学学报,2015,38(1):85-92.
[8]唐嘉陵,王晓昌,蒲云辉,等.餐厨垃圾酸性发酵及其产物为碳源的脱氮特性[J].中国环境科学,2017(4):1426-1433.
[9]邹胜男,梅翔,谢玥,等.以剩余污泥水解酸化液为外加碳源的污水生物脱氮[J].环境工程学报,2011,5(11):2519-2526.
[10] Zhang Yongmei,Wang Xiaochang,Cheng Zhe,et al. Effect of fermentation liquid from food waste as a carbon source for enhancing denitrification in wastewater treatment[J]. Chemosphere,2016,144(42):689-696.
[11] A. Lehtomaki,L. Bjornsson. Two-stage anaerobic digestion of energy crops:methane production,nitrogen mineralisation and heavy metal mobilisation[J]. Environmental Technology,2006,27(2):209-218.
[12] Ashok V,Hait S. Remediation of nitrate-contaminated water by solidphase denitrification process-a review[J]. Environmental Science and Pollution Research,2015,22(11):8075-8093.
[13] Zhang Yi,Zhao Jia,Xu Fuqing,et al. Pretreatment of lignocellulosic biomass for enhanced biogas production[J]. Progress in Energy and Combustion Science,2014,42(1):35-53.
[14] Kaparaju P,Serrano M,Angelidaki I. Effect of reactor configuration on biogas production from wheat straw hydrolysate[J]. Bioresource Technology,2009,100(24):6317-6323.
[15]李桂淑,李广,李晶,等.剩余污泥发酵产物作为碳源的反硝化特性研究[J].工业水处理,2015,35(5):23-26.