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

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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Techno-economic analysis of sidestream ammonia removal technologies:Biological options versus thermal stripping

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Environmental Science and Ecotechnology 2023年第1期13卷 107-114页

作者： Pascal Ochs Ben Martin Eve Germain-Cripps Tom Stephenson Mark van Loosdrecht Ana Soares Cranfield University College RoadCranfieldBedfordMK430ALUnited Kingdom Thames Water Reading STWIsland RoadRG20RPReadingUnited Kingdom Delft University of Technology Building 58Van der Maasweg 92629DelftNetherlands

Over the past twenty years,various commercial technologies have been deployed to remove ammonia(NH4eN)from anaerobic digestion(AD)*** recent years many anaerobic digesters have been upgraded to include a pre-treatment,such as the thermal hydrolysis process(THP),to produce more biogas,increasing NH4eN concentrations in the liquors are costly to *** study provides a comparative techno-economic assessment of sidestream technologies to remove NH4eN from conventional AD and THP/AD dewatering liquors:a deammonification continuous stirred tank reactor(PNA),a nitrification/denitrification sequencing batch reactor(SBR)and thermal ammonia stripping process with an ammonia scrubber(STRIP).The SBR and PNA were based on full-scale data,whereas the STRIP was designed using a computational approach to achieve NH4eN removals of 90e95%.The PNA presented the lowest whole-life cost(WLC)over 40 years,with£7.7 M,while the STRIP had a WLC of£43.9 *** study identified that THP dewatering liquors,and thus a higher ammonia load,can lead to a 1.5e3.0 times increase in operational expenditure with the PNA and the ***,this study highlighted that deammonification is a capable and cost-effective nitrogen removal *** like the STRIP respond to current pressures faced by the water industry on ammonia recovery together with targets to reduce nitrous oxide ***,ammonia striping-based processes must further be demonstrated in WWTPs and WLC reduced to grant their wide implementation and replace existing technologies.

关键词： deammonification Nitrification Denitrification Wastewater Sludge dewatering liquors

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全程自养脱氨新技术处理低C/N比废水的研究

全程自养脱氨新技术处理低C/N比废水的研究

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'2001中国水污染治理行业发展论坛

作者：陈晓松杨虹李道棠上海交通大学生命科学技术学院

全程自养脱氨是近几年出现的很有发展前景的新型生物脱氮工艺之一,特别适用于处理含高浓度 NH-N 且 C/N 比低的废水,能有效地降低能耗,且无需外加有机碳源即可进行反硝化。建立合适的反应器数学模型模型对该工艺的进一步研究具有重要作... 详细信息

全程自养脱氨是近几年出现的很有发展前景的新型生物脱氮工艺之一,特别适用于处理含高浓度 NH-N 且 C/N 比低的废水,能有效地降低能耗,且无需外加有机碳源即可进行反硝化。建立合适的反应器数学模型模型对该工艺的进一步研究具有重要作用。本文利用悬浮填料床反应器进行全程自养脱氨的工艺研究,通过反应器的启动和连续运行,总氮去除负荷将近 250mg/Ld,除氮率可达到50-70%,具有较好的工艺运用前景。

关键词：全程自养脱氨 deammonification 厌氧氨氧化 Oland

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