摘要
以阿莫西林为研究对象,探讨了其经不同程度磁性纳米铁(Fe_3O_4 NPs)多相类芬顿预处理后对活性污泥理化特性及其微生物群落结构的影响。结果表明,随着预处理程度(未经预处理、经40%H_2O_2预处理和经60%H_2O_2预处理)的升高,活性污泥对废水COD平均去除率由81.5%升高到89.1%,氨氮平均去除率由86.2%升高到95.6%,同时活性污泥中蛋白酶的含量由0.13 mg·g-1升高到0.19 mg·g-1。且随着阿莫西林预处理程度的升高,活性污泥溶性微生物产物(SMP)的三维荧光光谱(EEM)中可见光区类腐殖酸与类富里酸的吸收峰强度逐渐减小,表明活性污泥活性良好。对于微生物群落分布而言,在未经预处理、经40%H_2O_2、经60%H_2O_2预处理的条件下,变形菌门所占比例分别为73..81%、84.08%和77.08%,同时厚壁菌门所占比例为0.6%、0.82%与0.78%。变形菌门为优势菌种,诸多固氮细菌与聚磷菌属于变形菌门;而厚壁菌门可利用水解酶来分解蛋白质与糖类,两者所占比例的升高,为废水中污染物的高效去除提供了保障。
Amoxicillin was used as the research object to investigate the effects of heterogeneous Fenton-like pretreatment on the physicochemical properties and microbial community structure of activated sludge after different degrees of magnetic nano-iron(Fe3O4NPs).The results showed that with increasing the pre-treatment degrees(without pre-treatment,with40%H2O2and60%H2O2),the average COD removal rate increased from81.5%to89.1%,and the average ammonia nitrogen removal rate increased from86.2%to95.6%by the activated sludge.Meanwhile,the protease content increased from0.13mg·g?1to0.19mg·g?1in the activated sludge.With the increase of pre-treatment degrees,three-dimensional excitation emission matrix(EEM)spectra demonstrated that the absorption peaks of the fulvic acids and humic acids in the visible region were gradually decreased in the soluble microbial products(SMP)of the activated sludge.It was showed that the activated sludge had good activity.In addition,the abundance of Proteobacteria was73.81%,84.08%,77.08%,and the abundance of Firmicutes was0.6%,0.82%,0.78%at without pre-treatment,with40%H2O2and60%H2O2pre-treatment condition,respectively.Proteobacteria was the dominant bacteria species.Many nitrogen-fixing bacteria and phosphorus-accumulating bacteria belong to Proteobacteria.Meanwhile,Firmicutes could use hydrolytic enzymes to degrade proteins and sugars.The increase of the proportion of Proteobacteria and Firmicutes had provided a guarantee for the efficient removal of pollutants in the wastewater.
作者
宿程远
郑鹏
廖黎明
邓秋金
陈孟林
黄智
SU Chengyuan;ZHENG Peng;LIAO Liming;DENG Qiujin;CHEN Menglin;HUANG Zhi(University Key Laboratory of Karst Ecology and Environmental Change of Guangxi,Guangxi Normal University,Guilin541004,Guangxi,China;School of Environment and Resources,Guangxi Normal University,Guilin541004,Guangxi,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2018年第12期5237-5245,共9页
CIESC Journal
基金
国家自然科学基金项目(51641803)
广西自然科学基金项目(2017GXNSFAA198277)
岩溶生态与环境变化研究广西高校重点实验室资助项目(YRHJ16Z007)~~
关键词
阿莫西林
类芬顿预处理
活性
需氧
氧化
amoxicilli
Fenton-like pre-treatment
reactivity
aerobic
oxidation
