添加蛋白质类餐厨垃圾促进污泥厌氧发酵产酸  

Anaerobic Fermentation of Sludge to Produce Acid Promoted by Addition of Protein Food Waste

作　　者：苑宏英 李琦[1,2] 张嘉艺 杨玉萍 王雪 张小亚 YUAN Hong-ying;LI Qi;ZHANG Jia-yi;YANG Yu-ping;WANG Xue;ZHANG Xiao-ya(School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China)

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室,天津300384

出　　处：《中国给水排水》2022年第17期100-103,共4页China Water & Wastewater

基　　金：政府间国际科技创新合作项目(2019YFE0122400);天津市水质科学与技术重点实验室项目(KJZHZ-CA-1754)。

摘　　要：为了提高发酵系统中短链脂肪酸(SCFAs)的产量,将蛋白质类餐厨垃圾按总固体(TS)质量比为1∶1添加到剩余污泥中,进行为期8 d的间歇式发酵,研究不同pH对SCFAs产量的影响。结果表明,向污泥中添加蛋白质类餐厨垃圾能够明显提高SCFAs产量,混合底物中最大SCFAs产量为215.9 mgCOD/gTS,是单独污泥的6.1倍。蛋白质类餐厨垃圾的添加,不仅提高了混合底物中蛋白质含量,而且促进了蛋白质的利用,从而导致SCFAs产量增加。强碱性条件有利于蛋白质含量丰富的混合底物产生SCFAs,这归因于溶解性COD(SCOD)的大量增加。pH为10的反应组SCOD浓度远高于其他反应组,为后续反应提供了基质。对混合底物在pH为10时SCFAs的组成进行分析发现,最主要的成分是乙酸,其次是丙酸。To improve the yield of short-chain fatty acids(SCFAs)in fermentation systems,protein food waste was added to the excess sludge at a total solid(TS)mass ratio of 1∶1,and batch experiment with fermentation cycle of 8 days was carried out to investigate the effect of different pH on the yield of SCFAs.The addition of protein food waste to excess sludge could significantly increase the SCFAs yield.The maximum SCFAs yield in the mixed substrate was 215.9 mgCOD/gTS,which was 6.1 times that of the single sludge.The addition of protein food waste not only increased the protein content in the mixed substrate,but also provided easily biodegradable proteins for the microorganisms,which led to the increase of SCFAs yield.Strongly alkaline condition was beneficial for protein-rich mixed substrate to produce SCFAs,which was attributed to the significant increase in soluble COD(SCOD).The SCOD of the experimental group with pH of 10 was much higher than that of the other control groups,which provided a substrate for the subsequent reactions.Analysis of the composition of SCFAs in mixed substrate at pH of 10 showed that acetic acid was the main component,followed by propionic acid.

关 键 词：短链脂肪酸 蛋白质类餐厨垃圾 污泥 厌氧发酵 

分 类 号：TU992[建筑科学—市政工程]