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biotreatment of Odor Waste Gases by Immobilized Ceramsite Biofilter

Agricultural Science & Technology 2016年第3期17卷 737-741页

作者：万俊杰曾志聪谢键羽庄煜培罗凯平柯志梅黎志坤广东轻工职业技术学院环境工程系广州510300

[Objective] To find out the process conditions and influence factors for the biotreatment of odor gases of hydrogen sulfide（H2S） and ammonia（NH3）. [Method]The degradation performances on H2 S and NH3 were investigated during the start-up and stable operation process of biofilter with ceramsites as the packing microorganisms. [Result] The biofilm formation of the biofilter system to purify the waste gas of H2 S was completed within 9 d, and the removal rate of H2 S could reach up to 99% with the initial concentration of 100-1 000 mg/m^3 and empty bed residence time（EBRT） of142-290 s. The biofilm formation of the biofilter system to purify the waste gas of NH3 was completed within 10 d with the removal rate reaching up to 94.61%.[Conclusion] Under suitable conditions, the biofilter showed high removal rates to both H2 S and NH3.

关键词： Biofilter Ammonia Hydrogen sulfide biotreatment

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Nanoscale zero-valent iron integrated with bioreactor for recalcitrant antimony-Congo red dyeing wastewater treatment

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Progress in Natural Science:Materials International 2023年第5期33卷 569-574页

作者： Jing Liu Airong Liu Yi Wei Jiahui Fu Wei-xian Zhang State Key Laboratory for Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University

Antimony（Sb） and recalcitrant organic dyes often coexist in dyeing wastewater, and the simultaneous removal of Sb and dyes has been a challenge for traditional biological method in the treatment of Sb-dyeing *** zero-valent iron（n ZVI） is particularly suitable for separating heavy metals and enhancing the biodegradability of recalcitrant organic compounds. Herein, n ZVI is integrated with bioreactors（n ZVI-bio system） to achieve enhanced removal of Sb and degradation of Congo red（CR） in wastewater. The n ZVI-bio system achieves a reduction in Sb levels from 2.5 g L-1to 0.064 mg L-1, with a color removal efficiency of up to 98.60 % and a reduction in COD from 167 mg L-1to 55 mg L-1. The excellent performance is mainly attributed to n ZVI pretreatment, which removes Sb and degrades CR into smaller and more biodegradable organic compounds,providing favorable environmental conditions for the subsequent biotreatment system. This suggests that integrated n ZVI-bio system has potential for the treatment of complex wastewater containing heavy metals and recalcitrant organic dyes.

关键词： Nanoscale zero-valent iron biotreatment Antimony Congo red nZVI-bio system

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Recovering rare earth elements via immobilized red algae from ammonium-rich wastewater

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Environmental Science and Ecotechnology 2022年第4期12卷 72-80页

作者： Yabo Sun Tao Lu Yali Pan Menghan Shi Dan Ding Zhiwen Ma Jiuyi Liu Yupeng Yuan Ling Fei Yingqiang Sun School of Chemistry&Chemical Engineering School of Material Science&EngineeringAnhui UniversityJiulong Rd 111HefeiAnhui230039PR China Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Anhui University) Ministry of EducationHefeiAnhui230601PR China Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province Anhui UniversityHefeiAnhui230601PR China Chemical Engineering Department University of Louisiana at LafayetteLafayetteLA70504United States

biotreatment of acidic rare earth mining wastewater via acidophilic living organisms is a promising approach owing to their high tolerance to high concentrations of rare earth elements(REEs);however,simultaneous removal of both REEs and ammonium is generally hindered since most acidophilic organisms are positively ***,immobilization of acidophilic Galdieria sulphuraria(***)by calcium alginate to improve its affinity to positively charged REEs has been used for simultaneous bioremoval of REEs and *** results indicate that 97.19%,96.19%,and 98.87%of La,Y,and Sm,respectively,are removed by *** beads(GS-BDs).The adsorption of REEs by calcium alginate beads(BDs)and GS-BDs is well fitted by both pseudo first-order(PFO)and pseudo second-order(PSO)kinetic models,implying that adsorption of REEs involves both physical adsorption caused by affinity of functional groups such as-COO-and -OH and chemical adsorption based on ion exchange of Ca^(2+) with ***,GS-BDs exhibit high tolerance to La,Y,and Sm with maximum removal efficiencies of 97.9%,96.6%,and 99.1%,***,the ammonium removal efficiency of GS-BDs is higher than that of free *** cells at an initial ammonium concentration of 100 mg L^(-1),while the efficiency decreases when initial concentration of ammonium is higher than 150 mg L^(-1).Last,small size of GS-BDs favors ammonium removal because of their lower mass transfer *** study achieves simultaneous removal of REEs and ammonium from acidic mining drainage,providing a potential strategy for biotreatment of REE tailing wastewater.

关键词： Immobilized algae Galdieria sulphuraria Rare earth elements Deammonification biotreatment

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