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Nitrate removal to its fate in wetland mesocosm filled with sponge iron:Impact of influent COD/N ratio

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 77-85页

作者： Zhihao Si xinshan song Xin Cao Yuhui Wang Yifei Wang Yufeng Zhao Xiaoyan Ge Awet Arefe Tesfahunegn College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile IndustryDonghua UniversityShanghai 201620China

Sponge iron(s-Fe°)is a porous metal with the potential to be an electron donor for denitrification.This study aims to evaluate the feasibility of using s-Fe as the substrate of wetland mesocosms.Here,wetland mesocosms with the addition of s-Fe"particles(CW-Fc)and a blank control group(CW-CK)were established.The NOj-N reduction property and water quality parameters(pH.DO.and ORP)were examined at three COD/N ratios(0.***.and 10).Results showed that the NO3--N removal efficiencies were significantly increased by 6.6 to 58.9%in the presence of s-Fe NH4+-N was mainly produced by chemical denitrification,and approximately 50% of the NO3--N was reduced to N4+-N,at the COD ratio of 0.An increase of the influent COD/N ratio resulted in lower chemical denitrification and higher bio-dcnitrification.Although chemical denitrification mediated by s-Fe led to an accumulation of NH4+-N at COD/N ratios of 0 and 5.the TIN removal efficiencies increased by 4.5#12.4#.Moreover,the effluent pll,DO.and ORP values showed a significant negative correlation with total Fe and Fe(II)(P<0.01).High-throughput sequencing analysis indicated that Trichococctis(77.2%)was the most abundant microorganism in the CW-Fc mcsocosm,while Thauera,Zoogloea.and Herbaspirillum were the primary denitrifying bacteria.The denitrifiers,Simplicispira,IXxhloronwnas,and Denirratisoma.were the dominant bacteria for CW-CK.This study provides a valuable method and an improved understanding of NOj-N reduction characteristics of s-Fc in a wetland mcsocosm.

关键词： Sponge iron Wetland mesocosm Electronic donor Denitrification COD/N ratio

复合钛网生物膜电极反应器处理低C/N污水脱氮性能及机理研究

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环境科学学报 2024年第7期44卷 14-25页

作者：于晓倩崔申申付政宋新山王宇晖东华大学环境科学与工程学院上海201620

本研究在金属钛网间填充无机纤维棉形成多层电极组件,构建了一种新型复合钛网生物膜电极反应器(Multi Titanium-mesh Biofilm Electrode Reactor,MTBER)用于低碳氮比(C/N)污水的脱氮处理,并探究了电流密度、进水C/N、总氮负荷及水力停... 详细信息

本研究在金属钛网间填充无机纤维棉形成多层电极组件,构建了一种新型复合钛网生物膜电极反应器(Multi Titanium-mesh Biofilm Electrode Reactor,MTBER)用于低碳氮比(C/N)污水的脱氮处理,并探究了电流密度、进水C/N、总氮负荷及水力停留时间(HRT)对MTBER脱氮性能的影响.结果表明,总氮去除最佳电流密度范围为250~350 m A·m^(-2),适宜进水总氮浓度为60~75 mg·L^(-1),最佳水力停留时间为12~16 h.当C/N=1,进水总氮浓度=75 mg·L^(-1),电流密度=250 m A·m^(-2),HRT=12 h时,NO_(3)^(-)-N、NH_(4)^(+)-N和TN的去除率与未通电时相比分别提高了29.67%、30.30%和26.83%.MTBER对TN的脱除机制主要是在电化学氧化还原作用条件下,体系硝化、异养及氢自养协同反硝化的共同结果.

关键词：复合钛网生物膜电极反应器低C/N污水脱氮性能氢自养反硝化同步硝化反硝化

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PDADMAC改性蒙脱土制备硝酸根吸附剂

东华大学学报（自然科学版） 2024年第1期50卷 127-133页

作者：袁雨暄顾雨薇宋新山赵晓祥环境科学与工程学院东华大学上海201600 国家环境保护部纺织工业污染防治工程技术中心东华大学上海201600

硝酸根因其电负性强、水溶性大,难以形成沉淀,因而难以被快速吸附去除,通过化学改性增加吸附剂表面正电性可增强硝酸根吸附。用聚二甲基二烯丙基氯化铵(poly dimethyl diallyl ammonium chloride, PDADMAC)对蒙脱土进行改性,成功将PDAD... 详细信息

硝酸根因其电负性强、水溶性大,难以形成沉淀,因而难以被快速吸附去除,通过化学改性增加吸附剂表面正电性可增强硝酸根吸附。用聚二甲基二烯丙基氯化铵(poly dimethyl diallyl ammonium chloride, PDADMAC)对蒙脱土进行改性,成功将PDADMAC负载在蒙脱土表面;通过对改性前后蒙脱土(Mt)进行表征,对比分析吸附机制。结果表明:改性后蒙脱土(PDM-Mt)的季胺氮含量增加,表面电势大幅提高;PDM-Mt对NO-3-N的吸附量在pH=7时为3.07 mg/g,相比改性前提升了86%;吸附过程符合准二级动力学模型以及Langmuir吸附等温模型,即主要是单分子层化学吸附;PDM-Mt对NO-3-N吸附过程在4 h内达到平衡,在pH值为5~7时有明显吸附效果;重复5次吸附后吸附量下降了21%,具有较高的可循环利用性。由此可见,PDADMAC具有作为改性剂促进硝酸根吸附的潜力。

关键词：硝酸根吸附改性蒙脱土 PDADMAC 阴离子吸附剂

Effects of Elevated CO_2 and Drought on Plant Physiology, Soil Carbon and Soil Enzyme Activities

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Pedosphere 2017年第5期27卷 846-855页

作者： WANG Yuhui YAN Denghua WANG Junfeng DING Yi song xinshan College of Environmental Science and Engineering Donghua University China Institute of Water Resources and Hydropower Research

Global climate models have indicated high probability of drought occurrences in the coming future decades due to the impacts of climate change caused by a mass release of CO_2. Thus, climate change regarding elevated ambient CO_2 and drought may consequently affect the growth of crops. In this study, plant physiology, soil carbon, and soil enzyme activities were measured to investigate the impacts of elevated CO_2 and drought stress on a Stagnic Anthrosol planted with soybean(Glycine max). Treatments of two CO_2 levels, three soil moisture levels, and two soil cover types were established. The results indicated that elevated CO_2 and drought stress significantly affected plant physiology. The inhibition of plant physiology by drought stress was mediated via prompted photosynthesis and water use efficiency under elevated CO_2 conditions. Elevated CO_2 resulted in a longer retention time of dissolved organic carbon(DOC) in soil, probably by improving the soil water effectiveness for organic decomposition and mineralization. Drought stress significantly decreased C:N ratio and microbial biomass carbon(MBC), but the interactive effects of drought stress and CO_2 on them were not significant. Elevated CO_2 induced an increase in invertase and catalase activities through stimulated plant root exudation.These results suggested that drought stress had significant negative impacts on plant physiology, soil carbon, and soil enzyme activities,whereas elevated CO_2 and plant physiological feedbacks indirectly ameliorated these impacts.

关键词：大气CO2浓度升高植物生理学土壤酶活性干旱胁迫土壤碳过氧化氢酶活性全球气候模型水分利用效率

Climate Trends of Temperature, Precipitation and River Discharge in the Abbay River Basin in Ethiopia

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Journal of Water Resource and Protection 2019年第10期11卷 1292-1311页

作者： Asaminew Abiyu Cherinet Denghua Yan Hao Wang xinshan song Tianlin Qin Mulualem T. Kassa Abel Girma Batsuren Dorjsuren Mohammed Gedefaw Hejia Wang Otgonbayar Yadamjav College of Environmental Science and Engineering Donghua University Shanghai China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research (IWHR) Beijing China Department of Water Resources China Institute of Water Resources and Hydropower Research (IWHR) Beijing China Bio-Taq Economy Innovations (BioTEI) Inc. Winnipeg Canada Department of Natural Resource Management University of Gondar Gondar Ethiopia Department of Environment and Forest Engineering School of Engineering and Applied Sciences National University of Mongolia Ulaanbaatar Mongolia Department of Hydraulic Engineering Tsinghua University Beijing China Department of Sociology and Social Work School of Art & Sciences National University of Mongolia Ulaanbaatar Mongolia.

Projecting future changes of streamflow in the Abby River Basin (ARB) is important for planning and proper management of the basin system. The current study conducted in five stations of the Abbay river basin, and investigated the annual temperature, precipitation, and river discharge variability using the Innovative trend analysis method, Mann-Kendall, and Sen’s slope test estimator. The result showed a slightly increasing trend of annual precipitation in Assoa (Z = 0.71), Bahir Dar (Z = 0.13), and Gonder (Z = 0.26) stations, while a significant increasing trend was observed in Nedgo (Z = 2.45) and Motta (Z = 1.06) stations. Interestingly, the trend of annual temperature in Assosa (Z = 5.88), Bahir Dar (Z = 3.87), Gonder (Z = 4.38), Nedgo (Z = 4.77), and Motta (Z = 2.85) was abruptly increased. The average mean temperature has increased by 0.2°C in the past 36 years (1980 to 2016). The extreme high temperature was observed in the semi-dry zone of northern Ethiopia. During the study period, a significant declining trend of the river discharge was recorded, and the river discharge was sharply decreased from 1992 onwards. The results of the current study showed annual variability of river discharge, precipitation, and temperature of the study area of the basin that could be used as a basis for future studies.

关键词： Abbay River Basin Climate Change Ethiopia Precipitation River Discharge Temperature

Trickling filter in a biocathode microbial fuel cell for efficient wastewater treatment and energy production

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Science China(Technological Sciences) 2019年第10期62卷 1703-1709页

作者： CAO Xin LIANG Peng song xinshan WANG YuHui Qiu Yong HUANG Xia State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Scienceand EngineeringDonghua UniversityShanghai201620China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

Aiming to reduce the energy input, oxygen supply by trickling filter was employed in a biocathode microbial fuel cell(MFC) to examine its performance of electricity production and sewage treatment. During batch operation, trickling MFC(TMFC) could start and aerate effectively(DO>3.60 mg/L). During continuous operation, TMFC produced a maximum current density of 71.8 A/m^3 and maximum power density of 26.2 W/m^3 under the hydraulic retention time(HRT) of 10 h. By increasing the HRT to 15 h, 90.6% of COD and 99.0% of ammonia in simulated domestic sewage were efficiently removed and the maximum power density was 19.4 W/m^3. Continuous purification of real municipal wastewater achieved 85.9% of COD removal rate and 91.6%of ammonia removal rate. Sequencing result of biocathodic microorganisms indicated that it consisted of four major classes and the dominant class was γ-proteobacteria, which accounted for up to 84.38%. The dominant genus was Acinetobacter, which accounted for 57.81%. The phylogenetic tree showed different relationships among the 19 species of biocathode microorganisms and the predominant species was Acinetobacter calcoaceticus.

关键词： microbial fuel cell biocathode trickling filter electricity generation sewage purification

Modeling on Residence Time Distribution in Subsurface Flow Constructed Wetlands by Multi Flow Dispersion Model

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湿地科学 2010年第3期8卷 233-239页

作者： ZHANG Tao song xinshan LU Shoubo YAN Denghua College of Environmental Science and Engineering Donghua UniversityShanghai 201620P.R.China China Institute of Water Resources and Hydropower Research Beijing 100044P.R.China

As an important design factor for constructed wetlands,hydraulic retention time and its distribution will affect the treatment performance.Instantaneously injected sodium chloride tracers were used to obtain residence time distributions of the lab scale subsurface flow constructed wetland.Considering the presence of trailing and multiple peaks of the tracer breakthrough curve,the multi flow dispersion model(MFDM)was used to fit the experimental tracer breakthrough curves.According to the residual sum of squares and comparison between the experimental values and simulated values of the tracer concentration,MFDM could fit the residence time distribution(RTD)curve satisfactorily,the results of which also reflected the layered structure of wetland cells,thus to give reference for application of MFDM to the same kind of subsurface flow constructed wetlands.

关键词： subsurface flow constructed wetlands tracer test residence time distribution multi flow dispersion model

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硫铁矿介导的自养反硝化研究进展

化工进展 2023年第9期42卷 4863-4871页

作者：许中硕周盼盼王宇晖黄威宋新山东华大学环境科学与工程学院上海201600

硫铁矿介导的自养反硝化是一种经济、高效和绿色的生物处理技术,具有节省外加有机碳源、同步脱氮除磷、减少污泥产量和CO_(2)排放量等优势,是近年来污水处理领域研究的前沿和焦点。本文系统总结了自然生境中硫铁矿介导的自养反硝化现象... 详细信息

硫铁矿介导的自养反硝化是一种经济、高效和绿色的生物处理技术,具有节省外加有机碳源、同步脱氮除磷、减少污泥产量和CO_(2)排放量等优势,是近年来污水处理领域研究的前沿和焦点。本文系统总结了自然生境中硫铁矿介导的自养反硝化现象以及基于硫铁矿构建的生物处理技术现状;分析了硫铁矿特性、添加量、pH以及温度等关键因素对其效能的影响;阐述了硫铁氧化耦合硝氮还原的功能微生物及其生物化学机制;探讨了硫铁矿生物利用性和铁沉积物抑制作用等关键难点,并提出了相应的潜在对策。综上所述,本文概述了硫铁矿介导的自养反硝化技术的现状、影响因素、生物机制以及关键难点四方面内容,以促进对硫铁矿介导的自养反硝化的深度理解,进而推动其在污水处理领域的实际应用。

关键词：硫铁矿自养反硝化影响因素生物机制

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一种改性生物填料强化生活污水脱氮效果研究

环境科学学报 2022年第1期42卷 222-230页

作者：程贤良王宇晖宋新山许中硕东华大学环境科学与工程学院上海201620

生物强化脱氮技术是城镇污水处理厂的重点关注之一.大量研究表明改性填料可以增强污水生物脱氮效果.本文制备了负载纳米MnO_(2)的改性聚氨酯棉填料(聚氨酯/MnO_(2)),构建分别以聚氨酯/MnO_(2)和聚氨酯为填料的生物滤池对比系统(R1和R2)... 详细信息

生物强化脱氮技术是城镇污水处理厂的重点关注之一.大量研究表明改性填料可以增强污水生物脱氮效果.本文制备了负载纳米MnO_(2)的改性聚氨酯棉填料(聚氨酯/MnO_(2)),构建分别以聚氨酯/MnO_(2)和聚氨酯为填料的生物滤池对比系统(R1和R2);并进一步探究两个系统对生活废水的脱氮效果差异以及主要运行参数的影响作用.结果表明,整个运行过程中实验组R1的脱氮效果优于对照组R2;其中,当进水C/N比为11,DO和HRT分别为3~4 mg·L^(-1)和12 h时,出水水质均可达到GB18918-2002《城镇污水处理厂污染物排放标准》一级A类标准.进一步地,当COD去除率均在85%以上时,R1的总氮去除负荷(0.059 g·L^(-1)·d^(-1))高于R2(0.047 g·L^(-1)·d^(-1));其中,NH_(4)^(+)-N、NO_(3)^(-)-N和TN的去除率比对照组R2分别提高了9.7%、20.0%、17.0%.本研究可为城镇污水处理厂中生物脱氮工艺提供新技术和新思路.

关键词：改性填料二氧化锰生物滤池脱氮