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Hematite-facilitated microbial ammoxidation for enhanced nitrogen removal in constructed wetlands

Frontiers of Environmental Science & Engineering 2024年第7期18卷 35-45页

作者： Hao Qin Wenbo Nie Duo Yi Dongxu Yang Mengli Chen Tao Liu Yi Chen Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment(Ministry of Education) Chongqing UniversityChongqing 400045China College of Environment and Ecology Chongqing UniversityChongqing 400045China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 610031China

Constructed wetlands(CWs)are widely applied for decentralized wastewater ***,achieving efficient removal of ammonia(NH+-N)has proven challenging due to insufficient *** this study,natural hematite(Fe,O3)was employed as a CW substrate(H-CWs)for the first time to drive anaerobic ammonia oxidation coupled with iron(I)reduction(Feammox).Compared to gravel constructed wetlands(G-CWs),ammonia removal was enhanced by 38.14%to 54.03%and nitrous oxide(N_(2)0)emissions were reduced by 34.60%in *** synergistic removal of ammonia and nitrate by H-CWs also resulted in the absence of ammoxidation *** and 15N isotope tracer incubations showed that Feammox accounting for approximately 40%of all ammonia removal in the *** enrichment of iron phosphate(Fe_(3)Fe_(4)(PO_(4))_(6))promoted the accumulation of the Feammox intermediate compound *** nanowires were observed on the surface of H-CW substrates as well,suggesting that the observed biological ammoxidation was most likely related to extracellular electron transfer(EET).Microbial and metagenomics analysis revealed that H-CWs elevated the integrity and enhanced the abundance of functional microorganisms and genes associated with nitrogen ***,the efficient ammonia removal in the absence of O2 together with a reduction in N_(2)O emissions as described in this study may provide useful guidance for hematite-mediated anaerobic ammonia removal in CWs.

关键词： Constructed wetlands nitrogen removal Feammox Hematite Iron cycle

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nitrogen removal from wastewater and bacterial diversity in activated sludge at different COD/N ratios and dissolved oxygen concentrations

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Journal of Environmental Sciences 2012年第6期24卷 990-998页

作者： Magdalena Zielińska Katarzyna Bernat Agnieszka Cydzik-Kwiatkowska Joanna Sobolewska Irena Wojnowska-Baryla Department of Environmental Biotechnology University of Warmia and Mazury in OlsztynS oneczna St.45G10-709 OlsztynPoland

The impact of the organic carbon to nitrogen ratio （chemical oxygen demand （COD）/N） in wastewater and dissolved oxygen （DO） concentration on carbon and nitrogen removal efficiency, and total bacteria and ammonia-oxidizing bacteria （AOB） communities in activated sludge in constantly aerated sequencing batch reactors （SBRs） was determined. At DO of 0.5 and 1.5 mg O2/L during the aeration phase, the efficiency of ammonia oxidation exceeded 90%, with nitrates as the main product. Nitrification and denitrification achieved under the same operating conditions suggested the simultaneous course of these processes. The most effective nitrogen elimination （above 50%） was obtained at the COD/N ratio of 6.8 and DO of 0.5 mg O2/L. Total bacterial diversity was similar in all experimental series, however, for both COD/N ratios of 6.8 and 0.7, higher values were observed at DO of 0.5 mg O2/L. The diversity and abundance of AOB were higher in the reactors with the COD/N ratio of 0.7 in comparison with the reactors with the COD/N of 6.8. For both COD/N ratios applied, the AOB population was not affected by oxygen concentration. Amplicons with sequences indicating membership of the genus Nitrosospira were the determinants of variable technological conditions.

关键词： nitrogen removal activated sludge COD/N ratio oxygen concentration ammonia-oxidizing bacteria microbial diversity

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nitrogen removal influence factors in A/O process and decision trees for nitrification/denitrification system

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Journal of Environmental Sciences 2004年第6期16卷 901-907页

作者： MAYong PENGYong-zhen WANGShu-ying WANGXiao-lian SchoolofMunicipalandEnvironmentalEngineering HarbinInstituteofTechnologyHarbin150090China DepartmentofEnvironmentalEngineering BeijingUniversityofTechnologyBeijing100022China

In order to improve nitrogen removal in anoxic/oxic(A/O) process effectively for treating domestic wastewaters, the influence factors, DO(dissolved oxygen), nitrate recirculation, sludge recycle, SRT(solids residence time), influent COD/TN and HRT(hydraulic retention time) were studied. Results indicated that it was possible to increase nitrogen removal by using corresponding control strategies, such as, adjusting the DO set point according to effluent ammonia concentration; manipulating nitrate recirculation flow according to nitrate concentration at the end of anoxic zone. Based on the experiments results, a knowledge-based approach for supervision of the nitrogen removal problems was considered, and decision trees for diagnosing nitrification and denitrification problems were built and successfully applied to A/O process.

关键词： A/O process nitrification denitrification nitrogen removal decision trees

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nitrogen removal from sludge dewatering effluent through anaerobic ammonia oxidation process

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Journal of Environmental Sciences 2005年第6期17卷 1030-1033页

作者： ZHANG Shao-hui ZHENG Ping HUA Yu-mei Department of Environmental Engineering Zhejiang University Hangzhou 310029 China

Anaerobic ammonia oxidation（Anammox） process is a novel and promising wastewater nitrogen removal process. The feasibility of transition of Anammox from denitrification and the performance of lab-scale Anammox biofilm reactor were investigated with sludge dewatering effluent. The results showed that Anammox process could be successfully started up after cultivation of denitrification biofilm and using it as inoculum. The transition of Anammox from denitrification was accomplished within 85 d. Anammox process was found suitable to remove ammonia from sludge dewatering effluent. The effluent ammonia concentration was detected to be 23.11 mgN/L at HRT of 28 h when influent ammonia concentration was fed 245 mgN/L, which was less than that for the national discharge standard Ⅱ （25 rngN/L） of China. Volumetric total nitrogen loading rate was up to 584.99 mg TN/（L. d） at HRT of 17 h, while influent concentrations were kept 243.25 mg NH4＊ -N/L and 288.31 mg NO2^- -N/L.

关键词： denitrification Anammox sludge dewatering effluent nitrogen removal

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nitrogen removal from Molten Steel under Argon DC Glow Plasma

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Journal of Iron and Steel Research International 2005年第4期12卷 6-8页

作者： SUNMing-shan DINGWei-zhong LUXiong-gang TaiyuanIronandSteelGroupCo Taiyuan030003China ShanghaiUniversity Shanghai200072China

Under argon DC glow plasma, the nitrogen removal from molten steel was studied. The experimental result showed that nitrogen mass percent could be reduced to 0000 8%. The change of polarity had no impact on nitrogen removal when the nitrogen mass percent was low. The mechanism of denitrogenation of molten steel under argon DC glow plasma was discussed.

关键词： argon DC glow plasma nitrogen removal molten steel kinetic

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nitrogen removal from municipal wastewater by limit-oxic/anoxic/oxic biological aerated filter system

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Journal of Harbin Institute of Technology(New Series) 2011年第2期18卷 47-50页

作者：韩洪军胡宏博李雨霏王冰 State Key Laboratory of Urban Water Resources and Environment Harbin Institute of Technology

In this study,a three-stage biological aerated filter(BAF) system was proposed for the enhancement of nitrogen removal in the treatment of low carbon-to-nitrogen ratio(C/N ratio) municipal *** parameters were studied for each process for maximum nitrite accumulation in the nitrification step and nitrite adaptation in the denitrification *** accumulation during nitrification could be controlled by the dissolved oxygen(DO) concentration,presenting a mean value of 40% at around 1.0 mg DO/*** could be adapted to nitrite and the process was stable if nitrite in the reactor was keep *** the operational parameters were established,the process was stable and a steady state was maintained for over 30 days,and the various indexes of discharged water were up to the Discharge standard of pollutants for municipal wastewater treatment plant(GB18918-2002) Level-one *** was concluded that the three-stage BAF system proposed in this study was excellent in nitrogen removal performance by employing three-column functioning as short-cut nitrification,short-cut denitrification and secondary nitrification,respectively.

关键词： nitrogen removal BAF Municipal wastewater Nitrite accumulation DO

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Bamboo charcoal addition enhanced the nitrogen removal of anammox granular sludge with COD:Performance,physicochemical characteristics and microbial community

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Journal of Environmental Sciences 2022年第5期34卷 55-64页

作者： Menglei Guo Ying Jiang Junxiang Xie Qianfei Cao Qun Zhang Adams Mabruk Chongjun Chen School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou 215009China Jiangsu Provincial Key Laboratory of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China

The effects of different chemical oxygen demand(COD)concentrations on the anammox granular sludge with Bamboo Charcoal(BC)addition were evaluated in UASB *** results showed that the average total nitrogen(TN)removal efficiency was reduced from 85.9%to 81.4%when COD concentration was increased from 50 to 150 mg/***,the TN removal efficiency of BC addition reactors was dramatically 3.1%-6.4%higher than that without BC under different COD *** average diameter of granular sludge was 0.13 mm higher than that without *** settling velocity was increased by elevated COD concentration,while the EPS and VSS/SS were increased with BC *** high-throughput Miseq sequencing analyses revealed that the bacterial diversity and richness were decreased under COD addition,and the Planctomycetes related to anammox bacteria were Candidatus Brocadia and Candidatus *** Metagenomic sequencing indicated that the abundance of denitrification related functional genes all increased with elevated COD,while the abundance of anammox related functional genes of *** func-tional genes related to anammox was hydrazine synthase encoding genes(hzsA,hzsB and hzsB).The average relative abundance of hzs genes in the reactor with BC addition was higher than the control at COD concentrations of 50 mg/L and 150 mg/*** functional genes of denitrification mediated by BC were higher than those without BC throughout the operation *** is interesting to note that BC addition greatly enriched the related func-tional genes of denitrification and anammox.

关键词： Anammox granular sludge Bamboo charcoal COD concentration nitrogen removal Microbial community

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Experimental analysis of a nitrogen removal process simulation of wastewater land treatment under three different wheat planting densities

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Journal of Environmental Sciences 2002年第3期14卷 317-324页

作者： WangHQ ChenJJ StateKeyJointLaboratoryofEnvironmentalSimulationandPollutionControl InstituteofEnvironmentalSciencesBeijinNormalUniversityBeijing100875China.E－mail：whongqi@*** StateKeyJointLaboratory

nitrogen contaminant transport, transformation and uptake simulation experiments were conducted in green house under three different planting density of winter wheat. They were Group A, planting density of 0.0208 plants/cm 2, Group B, 0.1042 plants /cm 2, and Group C, 0.1415 plants/cm 2. The capacity and ratio of nitrogen removal were different on three kinds of conditions of wastewater land treatment. From analysis of wastewater treatment capacity, wastewater concentration and irrigation intensity for Group C were suitable and nitrogen quantity added was 2 times of that for Group B, 2.6 times for Group A while nitrogen residue was only 7.06%. Hence, wastewater irrigation and treatment design with purpose of waste water treatment should select the design with maximum capacity, optimal removal ratio and least residue in soil, which was closely related to crop planting density, crop growth status and also background nitrogen quantity in soil.

关键词： wastewater land treatment planting density winter wheat nitrogen removal soil

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nitrogen removal Performance of Continuous Anoxic/Oxic System Using Activated Sludge and Sludge Biofilms

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Journal of Donghua University(English Edition) 2021年第4期38卷 351-358页

作者： GHORI Faheem Ahmed CHEN Hong YU Xin SHE Shuaiqi XUE Gang CHEN Shanping SABIHA Yousuf College of Environmental Science and Engineering Donghua UniversityShanghai 201620China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Shanghai Institute for Design&Research on Environmental Engineering Co. Ltd.Shanghai 200232China College of Basic Medical Sciences Dalian Medical UniversityDalian 116044China

nitrogen is the most important component for living beings while the excessive discharge of organic and inorganic nitrogen may create severe environmental *** this study,a continuous anoxic/oxic(A/O)reactor adopting activated sludge and sludge biofilms in the anoxic and oxic zones was applied for total nitrogen(TN)and chemical oxygen demand(COD)removal,and the efficiencies of nitrification and denitrification were compared as *** showed that when using activated sludge,the effluent concentrations of NH_(4)^(+)-N,NO_(3)^(-)-N,NO_(2)^(-)-N,TN and COD were inconsistent and fluctuated greatly,and the removal efficiencies of corresponding nitrification,denitrification and TN were also unstable;the obtained average COD removal efficiency was 85%.While using sludge biofilms,the acquired effluent concentrations of NH^(+)_(4)-N,NO^(-)_(3)-N,NO_(2)^(-)-N,TN and COD became stable and *** nitrification,denitrification,TN and COD removal efficiencies were 96%,84%and 65%and 94%,*** community analysis of sludge biofilms indicated that the genus Arcobacter was the major denitrifiers in the anoxic zone with relative abundance of 76.1%,and in the oxic zone the abundances of Acinetobacter,Hydrogenophaga and Nitrospira responsible for complete nitrification were 20.05%,7.6%and 3.7%*** high abundance of nitrifying bacteria and denitrifiers were related with the high and stable nitrogen and COD removal.

关键词： nitrogen removal suspended sludge biofilm anoxic/oxic system

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Influence of seasonal temperature change on autotrophic nitrogen removal for mature landfill leachate treatment with high-ammonia by partial nitrification-Anammox process

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Journal of Environmental Sciences 2021年第4期33卷 291-300页

作者： Xiang Li Ming-yu Lu Yong Huang Yi Yuan Yan Yuan School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology Suzhou 215009China

In this study,a denitrification(DN)–partial nitritation(PN)–anaerobic ammonia oxidation(Anammox)system for the efficient nitrogen removal of mature landfill leachate was built with a zone-partitioning self-reflux biological reactor as the core device,and the effects of changes in seasonal temperature on the nitrogen removal in non-temperature-control environment were *** results showed that as the seasonal temperature decreased from 34℃to 11.3℃,the total nitrogen removal rate of the DN-PN-Anammox system gradually decreased from the peak value of 1.42 kg/(m^(3)·day)to 0.49 kg/(m^(3)·day).At low temperatures(nitrogen load(NLR)of the system is not appropriate,the fluctuation of high NH_(4)^(+)-N concentration in the landfill leachate greatly influenced the stability of the nitrogen *** temperatures of 11℃–15℃,the NLR of the system is controlled below 0.5 kg/(m^(3)·day),which can achieve stable nitrogen removal and the nitrogen removal efficiency can reach above 96%.The abundance of Candidatus Brocadia gradually increased with the decrease of ***,Candidatus Brocadia and Candidatus Kuenenia as the main functional microorganisms in the low temperature.

关键词： Landfill leachate Denitrification-partial nitrification-Anammox Seasonal temperature nitrogen removal Microbiology community

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