水生态学杂志2025，Vol.46Issue(4)：12-23,12.DOI:10.15928/j.1674-3075.202408310001
斜生栅藻-活性污泥藻菌系统净水关键因素及多污染物去除研究
Key Factors Influencing Water Purification and Removal Rules for Multiple Pollutants in an Algal-Bacterial System of Scenedesmus obliquus-Activated Sludge
摘要
Abstract
To provide guidance for the efficient removal of antibiotics and conventional pollutants using the algal-bacterial symbiotic system,we explored multi-factor regulation efficiency,the dynamics of algal and bacterial density,and the interaction between antibiotics and conventional pollutants during water purification.In this study,an algal-bacterial system of Scenedesmus obliquus and activated sludge was constructed to treat secondary effluent.We quantitatively compared the impacts of light-dark conditions,nitrogen form,and hydraulic retention time(HRT)on the removal efficiency of conventional pollutants.Further,we explored the response of algal/bacterial biomass to an external stressor,and the subsequent removal efficiency of multiple pollutants and antibiotics.This was accomplished by adding the antibiotic sulfamethoxazole(SMZ)at various concentrations(0,1,4,7,10 mg/L)to the algal-bacterial system,under both light and dark conditions.Light was the key environmental factor affecting the algal-bacterial symbiotic system,and significantly improved pollutant removal by promoting nitrogen and phosphorus as-similation by the microalgae.Compared with dark conditions,the removal rates of total phosphorus(TP),nitrate nitrogen(NO3--N),and ammonia nitrogen(NH4+-N)on day 7 increased by 85.51%,24.88%,and 60.03%,respectively.Light promoted S.obliquus growth and,on day 7,algal density was higher by 264.00%(P<0.05)compared with the dark treatment.Under illuminated conditions,increasing the HRT from 3 days to 7 days enhanced mean removal of TP from 85.16%to 95.37%,NO3--N from-0.32%to 24.14%,NH4+-N from 26.71%to 58.45%,and COD from 57.28%to 89.96%.While the differences for NO3--N,NH4+-N,and COD were not statistically significant,the TP removal rate did decrease significant-ly,from 0.85 mg/(L·d)to 0.41 mg/(L·d)(P<0.05).The removal rate of SMZ was low in the algal-bacteri-al symbiotic system,with a removal range of 0-28.74%on day 10.The high SMZ concentration(10 mg/L)had opposite effects on algae and bacteria growth.Although SMZ inhibited bacterial growth,its removal was mainly attributed to bacterial metabolism,supplemented by microalgae.The high concentration of SMZ also promoted nitrate nitrogen removal under light conditions.关键词
斜生栅藻/活性污泥/抗生素/脱氮除磷/影响因素/协同去除Key words
Scenedesmus obliquus/activated sludge/antibiotics/nitrogen and phosphorus removal/influ-encing factor/synergistic removal分类
资源环境引用本文复制引用
田婉青,甘璐,庄林岚,张建..斜生栅藻-活性污泥藻菌系统净水关键因素及多污染物去除研究[J].水生态学杂志,2025,46(4):12-23,12.基金项目
国家杰出青年科学基金项目(51925803) （51925803）
自然科学基金面上项目(52370043). （52370043）
