Min Yitian, Wang Zhao, Su Junfeng, Ali Amjad, Huang Tinglin, Yang Wenshuo
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
Environ Res. 2023 May 1;224:115476. doi: 10.1016/j.envres.2023.115476. Epub 2023 Feb 16.
Composite pollutants are prevalent in wastewater, whereas, the simultaneous accomplishment of efficient nitrogen removal and resources recovery remains a challenge. In this study, a bioreactor was constructed to contain Pseudomonas sp. Y1 using polyester fiber wrapped with shell powder and iron carbon spheres, achieving ammonia nitrogen (NH-N) removal, phosphate (PO-P) recovery, and nickel (Ni) immobilization. The optimal performance of bioreactor was average removal efficiencies of NH-N, PO-P, calcium (Ca), and Ni as 82.42, 96.67, 76.13, and 98.29% at a hydraulic retention time (HRT) of 6 h, pH of 7.0, and influent Ca and Ni concentrations of 100.0 and 3.0 mg L, respectively. The bioreactor could remove PO-P, Ca, and Ni by biomineralization, co-precipitation, adsorption, and lattice substitution. Moreover, microbial community analysis suggested that Pseudomonas was the predominant genus and had possessed tolerance to Ni toxicity in wastewater. This study presented an effective method to synchronously remove NH-N, recover PO-P, and fix heavy metals through microbially induced carbonate precipitation (MICP) and heterotrophic nitrification and aerobic denitrification (HNAD) technology.
复合污染物在废水中普遍存在，然而，同时实现高效脱氮和资源回收仍然是一项挑战。在本研究中，构建了一个含有假单胞菌属Y1的生物反应器，该反应器使用包裹有贝壳粉和铁碳球的聚酯纤维，实现了氨氮（NH-N）去除、磷酸盐（PO-P）回收和镍（Ni）固定。生物反应器的最佳性能是在水力停留时间（HRT）为6小时、pH值为7.0、进水Ca和Ni浓度分别为100.0和3.0 mg/L时，NH-N、PO-P、钙（Ca）和Ni的平均去除效率分别为82.42%、96.67%、76.13%和98.29%。该生物反应器可通过生物矿化、共沉淀、吸附和晶格置换去除PO-P、Ca和Ni。此外，微生物群落分析表明，假单胞菌是主要属，并且对废水中的Ni毒性具有耐受性。本研究提出了一种通过微生物诱导碳酸盐沉淀（MICP）和异养硝化和好氧反硝化（HNAD）技术同步去除NH-N、回收PO-P和固定重金属的有效方法。
