文献类型：期刊文献

英文题名：Effects of different alkalis on hydrolysis of swine manure during dry anaerobic digestion and resultant nutrients availability

作者：Yuan, Tian[1]; Huang, Weiwei[2]; Lei, Zhongfang[1]; Zhao, Ziwen[1]; Zhang, Zhenya[1]

机构：[1] Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan; [2] Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, No. 130 Meilong Road, Shanghai, 200237, China

年份：2017

卷号：123

起止页码：138

外文期刊名：International Biodeterioration and Biodegradation

收录：EI(收录号：20172703875208)

语种：英文

外文关键词：Organic carbon - Manures - Nitrogen - Mineralogy - Biochemistry - Potassium hydroxide - Volatile fatty acids - Alkalinity - Enzyme activity - Sodium hydroxide - Anaerobic digestion - Fertilizers - Nutrients

摘要：Hydrolysis is regarded as the rate-limiting step for dry anaerobic digestion (AD) of organic solid wastes. This study investigated the effect of different alkalis (Ca(OH)2, CaO, KOH and NaOH) on hydrolysis of swine manure during thermophilic dry AD at initial pH 10 and nutrients availability of the digestate by evaluating soluble organics production, hydrolase activity, nitrogen mineralization degree and phosphorus fractionation. Compared to their initial values, addition of Ca(OH)2 promoted the hydrolysis rate by 140% and enhanced volatile fatty acids (VFAs) production by 320%. Nitrogen mineralization was enhanced from 56% of control group to 64% when Ca(OH)2 was applied for initial pH adjustment, while decrease in P bioavailability was unavoidable. Both addition of NaOH and KOH achieved an increase around 250% on soluble total organic carbon (TOC) after 18 days’ fermentation, while little VFAs production and ammonia nitrogen were detected. In addition, the correlation between hydrolase activity and solid organics solubilization was also addressed. Further work is necessary to shed light on the mechanisms of dry AD after alkali addition to manure wastes. ? 2017