摘要
活性污泥微生物活动是去除污染的核心驱动力。该文以7种不同的磷化合物作为单一磷源,对常规活性污泥(O-S活性污泥)和以硝酸盐作为电子受体驯化后的活性污泥(N-S活性污泥)的微生态影响差异进行了研究。结果显示,对于2种活性污泥系统,磷酸钠、三偏磷酸钠和三聚磷酸钠的优势菌均为Pseudomonas,经过60 h的培养,其占比分别达到62.33%、61.07%和52.23%(O-S系统)、68.38%和63.41%(N-S系统)。磷酸肌酸优势菌由Candidatus Accumulibacter转变为Pseudomonas,功能基因pho A和pho U丰度大幅度提高,分别达O-S系统的3.52倍和1.54倍。D-葡萄糖-6-磷酸和2-磷酸甘油酸在以硝酸盐为电子受体活性污泥作用下,其优势菌转变为Rhizobium(7.38%和17.20%)。这些结果表明,活性污泥经不同电子受体驯化后,其微生态不同,与碱性磷酸酶相关的功能基因丰度也发生了变化。
Microorganisms in activated sludge are essential for pollutants removal.In this paper,the difference in micro-ecology of activated sludge cultivation by oxygen(O-S)and nitrate(N-S)with seven types phosphorus was studied.The dominant bacteria of sodium phosphate,sodium trimetaphosphate and sodium tripolyphosphate reached Pseudomonas,culturing for 60 hours,the proportion of which was 62.33%,61.07%and 52.23%(O-S system),68.38%and63.41%(N-S system),respectively.The dominant bacteria of creatine phosphate acid changed from Candidatus accumulibacter to Pseudomonas,and the abundance of AKP-associated genes—pho A and pho U increased significantly,which was 3.52 times and 1.54 times of that of O-S system,respectively.With the action of activated sludge of nitrate as electron receptor,the dominant bacteria of D-glucose-6-phosphate and 2-phosphoglyceric acid were transformed into Rhizobium(7.38%and 17.20%).The results illustrated that the micro-ecology of activated sludge was different after cultivation with different electron receptors,and the abundance of functional genes related to alkaline phosphatase also changed.
作者
任梦丽
赵茘
黄绵松
张现国
孙凡蛟
郑蕾
REN Mengli;ZHAO Li;HUANG Miansong;ZHANG Xianguo;SUN Fanjiao;ZHENG Lei(College of Water Science,Beijing Normal University,Beijing 100875,China;Beijing Tongzhou Municipal Commission of Housing and Urban-rural Development,Beijing 101100,China;Ningxia Capital Sponge City Construction&Development Co.,Ltd,Guyuan 756000,China;Hebei University of Architecture,Zhangjiakou 075000,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2020年第9期1-7,共7页
Environmental Science & Technology
基金
北京市科技计划(Z181100005518012)
国家重大水专项(2017ZX07103)
关键词
活性污泥
磷源
电子受体
微生态
activated sludge
phosphorus resources
electron acceptors
micro-ecology
