餐厨垃圾乳酸发酵液为碳源时AAO生物脱氮除磷效能研究  

Biological nitrogen and phosphorus removal in AAO using lactic acid-rich fermentation liquid from food waste as carbon source

作　　者：孟雯 张佳颖 周俊才 聂显玲 史智炀 李晓玲[1,2] 高明 汪群慧 MENG Wen;ZHANG Jiaying;ZHOU Juncai;NIE Xianling;SHI Zhiyang;LI Xiaoling;GAO Ming;WANG Qunhui(School of Civil Engineering,Chang’an University,Xi’an 710061;Key Laboratory of Water Supply and Sewage Engineering,Ministry of Housing and Urban-Rural Development,Chang’an University,Xi’an 710054;Department of Environmental Engineering,University of Science and Technology Beijing,Beijing 100083)

机构地区：[1]长安大学建筑工程学院,西安710061 [2]长安大学建筑工程学院住建部给排水重点实验室,西安710054 [3]北京科技大学能源与环境工程学院,北京100083

出　　处：《环境科学学报》2023年第9期88-95,共8页Acta Scientiae Circumstantiae

基　　金：中央高校基本科研业务费资助项目(No.300102282104);高校合作项目(No.220128200613)。

摘　　要：以乳酸钠和餐厨垃圾乳酸发酵液(FLFW)分别为碳源,对比探究了污水中污染物的去除效果.结果表明,在AAO反应器中C/N为10时,以乳酸钠为碳源,TN、TP、COD去除率分别为96.06%±1.96%、94.00%±1.57%、92.83%±0.73%,以FLFW为碳源时分别为96.15%±2.62%、90.23%±4.91%、92.38%±1.76%(第51~70 d,FLFW-Ⅱ阶段).FLFW-Ⅱ阶段的反硝化速率为0.257 mg·g^(-1)·h^(-1)略高于乳酸钠体系(0.219 mg·g^(-1)·h^(-1)).在污泥性能方面,FLFW体系中污泥絮体更分散、沉降性能较差,研究发现这可能与系统中污泥EPS含量和蛋白质与多糖比值下降有关.高通量测序可知,FLFW系统中,硝化菌属如norank_f_Saprospiraceae(p_Bacteroidota)的相对丰度显著增加;此外,Proteobacteria中具有反硝化除磷功能的菌属Dechloromonas、Dokdonella等相对富集,表明FLFW系统可能存在反硝化除磷现象.但在FLFW-Ⅲ阶段,丝状菌Anaerolineae过度增殖,加剧了污泥膨胀现象,影响了系统的污染物去除效率.整体而言,餐厨垃圾乳酸发酵液是一种环境友好的资源型生物脱氮除磷高效碳源,但在活性污泥运行过程中存在的污泥膨胀问题还需要进一步研究.This study examined the efficacy of sodium lactate and lactic acid-rich fermentation liquid of food waste(FLFW)as carbon sources for removing contaminants.The results indicate that at a C/N ratio of 10 in the AAO reactor,using sodium lactate as the carbon source achieved removal rates of 96.06%±1.96%,94.00%±1.57%,and 92.83%±0.73%for TN,TP,and COD,respectively.Meanwhile,during the FLFW stabilization stage(51~70 d,FLFW-II),the removal rates were found to be 96.15%±2.62%,90.23%±4.91%,and 92.38%±1.76%,respectively.In addition,the denitrification rate was 0.257 mg·g^(-1)·h^(-1) in the FLFW-II stage,which was slightly higher than that of the sodium lactate system(0.219 mg·g^(-1)·h^(-1)).With regard to sludge characteristics,the FLFW system displayed more dispersed sludge flocs and poorer settling performance,which might be attributed to the decrease in EPS content and protein-to-polysaccharide ratio of the sludge.High-throughput sequencing results demonstrated a notable increase in the relative abundance of nitrifying genera,such as norank_f_Saprospiraceae(p_Bacteroidota),within the FLFW system.Furthermore,the genera Dechloromonas and Dokdonella in Proteobacteria,which play important roles in denitrification and phosphorus removal,still showed a relatively higher abundance,suggesting the likelihood of denitrification and phosphorus removal processes occurring within FLFW system.Nevertheless,during the FLFW-III stage,the presence of filamentous bacteria Anaerolineae worsened the problem of bulking,negatively impacting the removal of contaminants.In general,the findings suggest that FLFW is a promising and ecologically sustainable carbon source for biological nitrogen and phosphorus removal.However,additional research is required to address the issue of sludge bulking during operation.

关 键 词：餐厨垃圾乳酸发酵液 外加碳源 污染物去除 微生物群落 胞外聚合物 

分 类 号：X703[环境科学与工程—环境工程]