厨余垃圾短程发酵产物的性质及其反硝化性能  

Characteristics of free fermentation products from food wastes and its denitrification performance

作　　者：张永梅[1] 王晓昌[1] 程喆[1] 李玉友[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]日本东北大学环境科学研究院

出　　处：《环境工程学报》2017年第5期3017-3023,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(50838005)

摘　　要：针对厨余垃圾的短程自由发酵过程,考察了不同初始固体浓度在60 h内对发酵过程和发酵产物的影响,结果表明,短程自由发酵是一种不完全的水解酸化过程,初始固体浓度为(13±0.5)%时有机酸(以COD计)产量最高(16.56 g·L^(-1))。短程发酵液是以碳水化合物为主,同时也包含了乳酸、乙酸、蛋白质和丁酸等的混合物碳源。发酵液的反硝化性能通过硝酸盐利用速率(NUR)实验来验证,结果表明COD/N=6是最优条件,该条件下的反硝化速率v_(DN)=12.89 mg·(g·h)-1(以VSS计)和反硝化能力P_(DN)=0.174 g·g^(-1)(以COD计),同时短程发酵液中快速降解有机物组分为58.35%。Food wastes were used for free short-term anaerobic fermentation to prepare a carbon source for en- hancing denitrification performance. The effect of initial solid concentration on the hydrolysis and acidogenesis products during 60 h of reaction was studied,and the results indicated that short-term fermentation led to an in- complete process,with the maximum organic acids content of （13 ±0.5）% occurring at the initial solid concen- tration （16.56 g · L^-1）. The short-term fermentation liquid was a complex carbon source that included a large proportion of carbohydrates with some lactic,acetic,and butyric acids and proteins. The denitrification perform- ance of the fermentation liquid was evaluated by a nitrate utilization rate （NUR）batch test and a COD/N of 6 was the optimum condition to obtain the lowest concentrations of nitrogen and COD in the effluent. Under this opti- mum condition,the denitrification performance parameters （with a denitrification rate VDN = 12. 89 mg · （g · h） ^-1（ caculated by VSS） and a denitrification potential PDN = 0. 174 g · g^-1（ caculated by COD） were obtained. The readily biodegradable substrates in the short-term fermentation liquid were 58.35%.

关 键 词：厨余垃圾 自然发酵 碳源 反硝化性能 

分 类 号：X703.1[环境科学与工程—环境工程]