期刊文献+
共找到289篇文章
< 1 2 15 >
每页显示 20 50 100
Feasibility Evaluation of Using Biochar-based Permeable Reactive Barrier for the Remediation of Mercury and Arsenic Composite Polluted Water Bodies
1
作者 Dilixiati·Abulizi 《Asian Agricultural Research》 2024年第5期15-19,共5页
This study employed a modified biochar material to construct a permeable reactive barrier(PRB)for the treatment of water bodies polluted with mercury and arsenic.The experimental results demonstrated that the addition... This study employed a modified biochar material to construct a permeable reactive barrier(PRB)for the treatment of water bodies polluted with mercury and arsenic.The experimental results demonstrated that the addition of goethite-modified biochar significantly enhanced the remediation efficiency of As(III),achieving a maximum removal rate of 100%.Conversely,pure biochar exhibited high efficiency in the removal of Hg(II),with a maximum removal rate approaching 100%.Furthermore,the pH level of the water significantly influenced the adsorption efficiency of heavy metal ions,with the optimal removal performance observed at a pH of 6.0.The PRB system demonstrated excellent removal rates under low concentrations of heavy metals.However,as the concentration increased,the remediation efficiency exhibited a slight decrease.In summary,the findings of this study provide compelling evidence for the use of modified biochar in the construction of PRBs for the remediation of mercury and arsenic-polluted water bodies.Furthermore,the study reveals the mechanism by which pH and heavy metal concentration influence remediation efficiency. 展开更多
关键词 BIOCHAR Goethite-modified biochar Permeable reactive barrier(PRB) Mercury and arsenic pollution remediation efficiency
下载PDF
Advances in Microbial Remediation on the Application of Heavy Metal Pollution in Agricultural Water Resources 被引量:2
2
作者 虞志强 《Agricultural Science & Technology》 CAS 2015年第12期2824-2828,共5页
Heavy metal pollution in agricultural water resources is very serious in re- cent years, resulting in large losses of the agricultural economy and endangering human life and health. Due to the advantages of low cost, ... Heavy metal pollution in agricultural water resources is very serious in re- cent years, resulting in large losses of the agricultural economy and endangering human life and health. Due to the advantages of low cost, high efficiency and less secondary pollution, microbial ramediation technology is widely used in the treatment of heavy metal pollution in agricultural water resources. At present, with the progress of modern biotechnology, microbial remediation of heavy metals in agricul- tural water resources has grown rapidly. The sources and status quo of heavy met- al pollution in agricultural water resources at home and aboard, and the principles of microbial remediation of heavy metals pollution in agricultural water resources were reviewed in this paper, as well as the several common microbial remediation technology of heavy metals in agricultural water resources. Additionally, the further research work of heavy metal contaminated agricultural water resources by microbial ramediation were prospected. 展开更多
关键词 Heavy metal pollution Microbial remediation Agricultural water re- sources Microbial absorption
下载PDF
Preparation of Biomanganese Oxide-biochar Composite and Its Remediation of Arsenic Contamination
3
作者 Dilixiati Abulizi 《Asian Agricultural Research》 2023年第5期24-28,33,共6页
[Objectives]To prepare biomanganese oxide/biochar composite(BMO-BC)and examine its remediation performance on arsenic contamination.[Methods]The BMO-BC was prepared by cultivating Pseudomonas putida MnB1 in the presen... [Objectives]To prepare biomanganese oxide/biochar composite(BMO-BC)and examine its remediation performance on arsenic contamination.[Methods]The BMO-BC was prepared by cultivating Pseudomonas putida MnB1 in the presence of Mn 2+and biochar.[Results]The initial concentration of Mn 2+in the culture system had no significant effect on the growth rate and domestication cycle of Pseudomonas putida MnB1.The results of SEM-EDS and XRD analysis confirm that the adsorbent prepared in this experiment was a composite of biomanganese oxide and biochar particles.The results of arsenic pollution removal test in simulated environment showed that the in-situ formed BMO-BC composite had certain removal effect on As(III)and the presence of biochar particles and manganese dioxide in the reaction system and the manganese oxidation ability of microbial strain MnB1 affect its remediation performance to As(III).[Conclusions]When the initial concentration is in the range of 0-10.0 mg/L,the isothermal adsorption data of BMO-BC on As(III)conforms to the Langmuir model. 展开更多
关键词 arsenic pollution Bio-manganese oxide BIOCHAR remediation
下载PDF
Photocatalytic removal of heavy metal ions and antibiotics in agricultural wastewater:A review 被引量:1
4
作者 Jiaxin Song Malik Ashtar +3 位作者 Ying Yang Yuan Liu Mingming Chen Dawei Cao 《Journal of Semiconductors》 EI CAS CSCD 2023年第11期26-41,共16页
In recent years,the treatment of agricultural wastewater has been an important aspect of environmental protection.The purpose of photocatalytic technology is to degrade pollutants by utilizing solar light energy to st... In recent years,the treatment of agricultural wastewater has been an important aspect of environmental protection.The purpose of photocatalytic technology is to degrade pollutants by utilizing solar light energy to stimulate the migration of photocarriers to the surface of photocatalysts and occur reduction-oxidation reaction with pollutants in agricultural wastewater.Photocatalytic technology has the characteristics of high efficiency,sustainability,low-energy and free secondary pollution.It is an environmental and economical method to recover water quality that only needs sunlight.In this paper,the mechanism and research progress of photocatalytic removal of heavy metal ions and antibiotics from agricultural water pollution were reviewed by combining photocatalytic degradation process with agricultural treatment technology.The mechanism of influencing factors of photocatalytic degradation efficiency was discussed in detail and corresponding strategies were proposed,which has certain reference value for the development of photocatalytic degradation. 展开更多
关键词 PHOTOCATALYSIS agricultural pollution water quality remediation heavy metals ANTIBIOTICS
下载PDF
Arsenic Distribution Pattern in Different Sources of Drinking Water and their Geological Background in Guanzhong Basin, Shaanxi, China 被引量:2
5
作者 LUO Kunli ZHANG Shixi +1 位作者 TIAN Yuan GAO Xing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第3期984-994,共11页
To study arsenic (As) content and distribution patterns as well as the genesis of different kinds of water,especially the different sources of drinking water in Guanzhong Basin,Shaanxi province,China,139 water sampl... To study arsenic (As) content and distribution patterns as well as the genesis of different kinds of water,especially the different sources of drinking water in Guanzhong Basin,Shaanxi province,China,139 water samples were collected at 62 sampling points from wells of different depths,from hot springs,and rivers.The As content of these samples was measured by the intermittent flowhydride generation atomic fluorescence spectrometry method (HG-AFS).The As concentrations in the drinking water in Guanzhong Basin vary greatly (0.00-68.08 tg/L),and the As concentration of groundwater in southern Guanzhong Basin is different from that in the northern Guanzhong Basin.Even within the same location in southern Guanzhong Basin,the As concentrations at different depths vary greatly.As concentration of groundwater from the shallow wells (〈50 m deep,0.56-3.87 μg/L) is much lower than from deep wells (110-360 m deep,19.34-62.91 μg/L),whereas As concentration in water of any depth in northern Guanzhong Basin is 〈10 μg/L.Southern Guanzhong Basin is a newly discovered high-As groundwater area in China.The high-As groundwater is mainly distributed in areas between the Qinling Mountains and Weihe River; it has only been found at depths ranging from 110 to 360 m in confined aquifers,which store water in the Lishi and Wucheng Loess (Lower and Middle Pleistocene) in the southern Guanzhong Basin.As concentration of hot spring water is 6.47-11.94 μg/L; that of geothermal water between 1000 and 1500 m deep is 43.68-68.08 μg/L.The high-As well water at depths from 110 to 360 m in southern Guanzhong Basin has a very low fluorine (F) value,which is generally 〈0.10 mg/L.Otherwise,the hot springs of Lintong and Tangyu and the geothermal water in southern Guanzhong Basin have very high F values (8.07-14.96 mg/L).The results indicate that high As groundwater in depths from 110 to 360 m is unlikely to have a direct relationship with the geothermal water in the same area.As concentration of all reservoirs and rivers (both contaminated and uncontaminated) in the Guanzhong Basin is 〈10 μg/L.This shows that pollution in the surface water is not the source of the high-As in the southern Guanzhong Basin.The partition boundaries of the high-and low-As groundwater area corresponds to the partition boundaries of the tectonic units in the Guanzhong Basin.This probably indicates that the high-As groundwater areas can be correlated to their geological underpinning and structural framework.In southern Guanzhong Basin,the main sources of drinking water for villages and small towns today are wells between 110-360 m deep.All of their As contents exceed the limit of the Chinese National Standard and the International Standard (〉10 μg/L) and so local residents should use other sources of clean water that are 〈50 m deep,instead of deep groundwater (110 to 360 m) for their drinking water supply. 展开更多
关键词 HYDROLOGY pollution water chemistry drinking water quality different groundwaterdepths arsenic content Pleistocene Loess Guanzhong Basin
下载PDF
Arsenic(III) Remediation from Contaminated Water by Oxidation and Fe/Al Co-Precipitation 被引量:1
6
作者 Wensheng Zhang Pritam Singh Touma B. Issa 《Journal of Water Resource and Protection》 2011年第9期655-660,共6页
Battery grade γ-MnO2 powder was investigated as an oxidant and an adsorbent in combination with Fe/Al coagulants for removal of arsenic from contaminated water. Simultaneous oxidation of As(III) and removal by coprec... Battery grade γ-MnO2 powder was investigated as an oxidant and an adsorbent in combination with Fe/Al coagulants for removal of arsenic from contaminated water. Simultaneous oxidation of As(III) and removal by coprecipitation/adsorption (one step process) was compared with pre-oxidation and subsequent removal by coprecipitation/adsorption (two step process). The rate of As(III) oxidation with MnO2 is completed in two stages: rapid initially followed by a first order reaction. As(III) is oxidised to As(V) by the MnO2 with a release of approximately 1:1 molar Mn(II) into the solution. No significant pH effect on oxidation of As(III) was observed in the pH range 4 - 6. The rate showed a decreasing trend above pH 6. The removal of As(V) by adsorption on the MnO2 decreased significantly with increasing pH from 4 to 8. The adsorption capacity of the γ-MnO2 with particle size 90% passing 10 μm was determined to be 1.5 mg/g at pH 7. MnO2 was found to be more effective as an oxidant for As(III) in the two step process than in the one step process. 展开更多
关键词 Manganese OXIDES Iron HYDROXIDES arsenic remediation Fe/Al COAGULANTS Contaminated water
下载PDF
Book Review of Green Materials for Sustainable Water Remediation and Treatment
7
作者 Nour-Eddine Es-Safi 《Green and Sustainable Chemistry》 2014年第3期175-176,共2页
Water is one of the most important substances on earth. Safe drinking water is essential to humans and other life forms. All plants and animals must have water to survive. If there was no water, there would be no life... Water is one of the most important substances on earth. Safe drinking water is essential to humans and other life forms. All plants and animals must have water to survive. If there was no water, there would be no life on earth. Apart from drinking it to survive, people have many other uses for water. This natural resource is becoming scarcer and its demand exceeds supply in some region rendering its availability a major social and economic concern. Apart of this scarcity is water pollution which is increasing day by day in many parts of the world. Sources of fresh water on land are getting more and more polluted than ever before. As a result, contaminated water became unsuitable for use. Poor water quality is deadly since contaminated water causes hazards to public health through poisoning or the spread of disease. In order to address these issues, the practice of water remediation has been developed. 展开更多
关键词 water water remediation pollution
下载PDF
Constructed Wetland Systems as a Methodology for the Treatment of Wastewater in Bucaramanga Industrial Park 被引量:2
8
作者 Chukwunonye Ezeah Carlos Alberto Ríos Reyes Jairo Fernando Contreras Gutiérrez 《Journal of Geoscience and Environment Protection》 2015年第3期1-14,共14页
Effluent discharges from municipal, industrial, and agricultural activities constitute major sources of pollution on land and water bodies. During the 1990s, large-scale application of Constructed Wetlands (CWs) as a ... Effluent discharges from municipal, industrial, and agricultural activities constitute major sources of pollution on land and water bodies. During the 1990s, large-scale application of Constructed Wetlands (CWs) as a remediation option drew much attention globally from the public and green groups alike. The most common application of CWs is for flow management in river system and little is documented on using CWs for treating polluted river water. This article goes beyond constructed wetlands as a stand-alone methodology to propose an integrated remediation system incorporating constructed wetlands in Bucaramanga Industrial Park S.A., Santander (Colombia), which will form part of an innovation park. In addition to pollution abatement, the project is projected to provide other environmental benefits to the entire Oro River Sub-basin. Other benefits of the project include mitigation of environmental impacts, improvement in water quality, landscape amenity, as well as tourism and recreational benefits. 展开更多
关键词 water pollution CONSTRUCTED WETLANDS WASTEwater integrated remediation System TOURISM and RECREATION
下载PDF
Coal fy ash:an emerging material for water remediation
9
作者 N.B.Singh Anupam Agarwal +1 位作者 Anindita De Pragya Singh 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第3期18-49,共32页
Coal fy ash(CFA)is a byproduct of thermal power plant and collected from fue gases by separator.Composition of CFA depends on the type of coal used and it has both crystalline and amorphous character.It is considered ... Coal fy ash(CFA)is a byproduct of thermal power plant and collected from fue gases by separator.Composition of CFA depends on the type of coal used and it has both crystalline and amorphous character.It is considered to be an environmental pollutant and used in number of areas.CFA is a useful material and widely used in cement production and as a promising adsorbent for water remediation.CFA used for remediation of wastewater solves problems related to water quality issues and waste management.The physical properties such as porosity,surface area,morphology,and chemical composition(iron oxide,alumina,silica,titania,etc.)make CFA efcient material for wastewater treatment.CFA is also converted to geopolymer,which is used as an adsorbent and photocatalyst.Dye,organic compounds,toxic heavy metal ions,etc.have been removed using CFA and modifed CFA adsorbents.Diferent adsorption efciencies have been reported for diferent adsorbate and CFA adsorbents.Numbers of adsorption isotherm and kinetic models have been discussed. 展开更多
关键词 Coal fy ash ADSORBENT DYE GEOPOLYMER water remediation POLLUTANTS
下载PDF
Nanobiochar for the remediation of contaminated soil and water:challenges and opportunities
10
作者 Mengyuan Jiang Lizhi He +7 位作者 Nabeel Khan Niazi Hailong Wang Williamson Gustave Meththika Vithanage Kun Geng Hua Shang Xiaokai Zhang Zhenyu Wang 《Biochar》 SCIE CAS CSCD 2023年第1期21-41,共21页
Although research on biochar has received increasing attention for environmental and agricultural applications,the significance of nanobiochar for environmental pollutant remediation is poorly understood.In contrast t... Although research on biochar has received increasing attention for environmental and agricultural applications,the significance of nanobiochar for environmental pollutant remediation is poorly understood.In contrast to bulk biochar,nanobiochar has superior physicochemical properties such as high catalytic activity,unique nanostructure,large specific surface area and high mobility in the soil environment.These unique characteristics make nanobiochar an ideal candidate for pollution remediation.Thus far,the research on nanobiochar is still in its infancy and most of the previous studies have only been conducted for exploring its properties and environmental functions.The lack of in-depth summary of nanobiochar’s research direction makes it a challenge for scientists and researchers globally.Hence in this review,we established some key fabrication methods for nanobiochar with a focus on its performance for the removal of pollutants from the environment.We also provided up-to-date information on nanobiochar’s role in environmental remediation and insights into different mechanisms involved in the pollutant removal.Although,nanobiochar application is increasing,the associated drawbacks to the soil ecosystem have not received enough research attention.Therefore,further research is warranted to evaluate the potential environmental risks of nanobiochar before large scale application. 展开更多
关键词 Environmental pollution NANOTECHNOLOGY Modified biochar remediation Soil and water system
原文传递
富里酸改性FeMnNi-LDH对砷镉污染土壤的钝化修复
11
作者 何雅馨 魏世强 蒋珍茂 《中国环境科学》 EI CAS CSCD 北大核心 2024年第4期2184-2197,共14页
选用腐殖质活性组分富里酸(FA)作为铁锰镍层状双氢氧化物(FeMnNi-LDH)的修饰物,采用共沉淀法制备出稳定层状FA@FeMnNi-LDH复合材料,并运用于As(Ⅲ)和Cd(Ⅱ)复合污染土壤的钝化修复.通过小白菜盆栽实验研究了在不同砷镉复合污染水平及不... 选用腐殖质活性组分富里酸(FA)作为铁锰镍层状双氢氧化物(FeMnNi-LDH)的修饰物,采用共沉淀法制备出稳定层状FA@FeMnNi-LDH复合材料,并运用于As(Ⅲ)和Cd(Ⅱ)复合污染土壤的钝化修复.通过小白菜盆栽实验研究了在不同砷镉复合污染水平及不同初始土壤pH值条件下,复合材料对土壤As(Ⅲ)和Cd(Ⅱ)的钝化效果、各形态含量变化及对小白菜根部和地上部As(Ⅲ)和Cd(Ⅱ)转运、富集系数的影响,并进行相关性分析.结果表明,FA@FeMnNi-LDH复合材料对As和Cd具有显著的同步钝化效果.当复合材料添加量由0%增加到1.0%,促进了土壤非专性吸附态和结晶铁铝氧化物结合态As向专性吸附态、无定型铁铝氧化物结合态和残渣态As转化,土壤可交换态Cd主要向残渣态、碳酸盐结合态、铁锰氧化物结合态和有机结合态Cd转化;土壤初始pH对As和Cd的钝化效果影响明显,酸性和中性土壤的pH分别增加了1.65和0.64个pH单位,土壤有效态As的降低率分别达到69.74%和63.31%,有效态Cd的降低率分别为60.25%和61.78%;小白菜的鲜重和株高随复合材料添加量的增加而提高,并且复合材料添加量的增加降低了小白菜各部位对As和Cd的转运和富集系数,使小白菜地上部As、Cd的浓度均低于国家食品安全标准限值.相关性分析显示,非专性吸附态As、可交换态Cd与土壤pH值呈极显著负相关性,残渣态As和Cd与土壤pH呈现极显著正相关,小白菜地上部分和根部中As和Cd的含量与土壤残渣态As和Cd呈极显著负相关关系.FA@FeMnNi-LDH复合材料能提高土壤pH值,促进土壤As和Cd向残渣态的转化,从而降低土壤As和Cd生物有效性和在小白菜植株中的累积,为土壤中As(Ⅲ)和Cd(Ⅱ)复合污染的同步修复提供了新的参考. 展开更多
关键词 层状双金属氢氧化物(LDH) 富里酸(FA) 改性 砷镉复合污染土壤 钝化修复
下载PDF
层状双氢氧化物在砷污染水体/土壤修复中的应用研究进展
12
作者 黄玮婷 白圆 +4 位作者 马睿 敬宗显 万馨雯 吴海龙 刘洁 《环境监测管理与技术》 CSCD 北大核心 2024年第3期1-6,共6页
综述了层状双氢氧化物(LDHs)的结构、特性及其在砷污染水体/土壤修复中的应用研究现状,介绍了共沉淀、水热合成、离子交换、溶胶凝胶、焙烧等LDHs制备方法,以及表面改性、插层、焙烧复原等改性方法。分析了LDHs吸附除砷的机理和影响因素... 综述了层状双氢氧化物(LDHs)的结构、特性及其在砷污染水体/土壤修复中的应用研究现状,介绍了共沉淀、水热合成、离子交换、溶胶凝胶、焙烧等LDHs制备方法,以及表面改性、插层、焙烧复原等改性方法。分析了LDHs吸附除砷的机理和影响因素,以及当前在材料合成、优化和应用过程中存在的不足,提出了形成工业化生产工艺、研发选择性和稳定性更强的复合材料、提升在复杂基体中的抗冲击负荷能力、探讨同构置换对层状结构的影响等后续研究方向。 展开更多
关键词 层状双氢氧化物 改性 吸附 砷污染 水体修复 土壤修复
下载PDF
自然保护区林地水源污染修复及防治策略研究
13
作者 马力子 于海洋 田国行 《林业调查规划》 2024年第1期46-50,203,共6页
林地水源污染关系到整个自然保护区内生物的生存与发展,为保护水源水质开展了水源污染修复及防治策略研究。以某自然保护区内的一处水源地为例,采集试验所需的原水,在选取试验试剂和设备的基础上,确定4项水质分析项目和对应的检测方法... 林地水源污染关系到整个自然保护区内生物的生存与发展,为保护水源水质开展了水源污染修复及防治策略研究。以某自然保护区内的一处水源地为例,采集试验所需的原水,在选取试验试剂和设备的基础上,确定4项水质分析项目和对应的检测方法。通过壳聚糖微球+活性渗滤反应墙、原位投菌技术来修复水源,通过人工湿地和人工增氧来实现污染防治。结果表明,修复策略实施后,各项水质指标表现越来越好,林地水源中浮游生物数量和叶绿素a含量逐渐上升,重金属综合污染指数和高锰酸盐指数逐渐下降,修复策略起到了应有的净化效果;防治策略实施后,前1~3 d内4项水质指标的表现仍在继续提升,之后出现小幅度下降并最终维持在一个较为平稳的水平,说明防治策略基本维持住了修复策略的实施效果,起到了应有的防治作用。 展开更多
关键词 自然保护区 林地水源污染 水质分析 污染修复 污染防治
下载PDF
基于低水位运行的城市河流污染底泥中微生物群落特征及影响因素 被引量:1
14
作者 吴琼 陈文龙 陈军 《水资源保护》 EI CAS CSCD 北大核心 2024年第2期126-133,共8页
针对低水位运行修复城市河流污染底泥微生物机制不清的问题,基于高、低水位下不同城市河流的底泥理化性质检测分析、宏基因组高通量测序及生物信息学分析等手段,开展了低水位运行的城市河流污染底泥中微生物群落特征及影响因素研究。结... 针对低水位运行修复城市河流污染底泥微生物机制不清的问题,基于高、低水位下不同城市河流的底泥理化性质检测分析、宏基因组高通量测序及生物信息学分析等手段,开展了低水位运行的城市河流污染底泥中微生物群落特征及影响因素研究。结果表明:变形菌门、放线菌门、厚壁菌门和广古菌门分别是不同水位运行条件下相对丰度最高的细菌门类和古菌门类;高水位运行条件下底泥中细菌的香农指数显著高于低水位运行条件下的指数值(p<0.001),古菌则相反,说明古菌群落可能主导了低水位运行过程中底泥污染物降解过程;低水位运行时变形菌门可能是参与底泥中含氮污染物降解以及氮循环过程的主要微生物门类,α-变形菌纲则可能对底泥中氨氮的去除发挥了重要作用;TOC,TN和NH_(3)-N是影响城市河流底泥中微生物群落变化的主要环境驱动因子;低水位运行不仅能够有效降低底泥中常规污染指标的污染程度,解决底泥内源污染问题,还能显著降低底泥中致病菌的潜在危害,构建更为安全的亲水城市河流生态系统。 展开更多
关键词 城市河流 污染底泥 低水位运行 微生物 修复机制
下载PDF
海泡石在农产品及水体重金属污染修复中的研究进展 被引量:1
15
作者 孙迪 陈灿 +3 位作者 龚意辉 马银花 张新 张斌 《生命科学研究》 CAS 2024年第1期83-94,共12页
海泡石是一种吸附性很强的黏土矿物,在修复土壤、水体重金属污染中具有很强的优越性。本文介绍了海泡石修复机理及其改性方法,并综述性介绍了海泡石在降低农产品重金属(镉、汞、砷、铅、锌和铬等)含量和净化水体重金属污染方面的研究进... 海泡石是一种吸附性很强的黏土矿物,在修复土壤、水体重金属污染中具有很强的优越性。本文介绍了海泡石修复机理及其改性方法,并综述性介绍了海泡石在降低农产品重金属(镉、汞、砷、铅、锌和铬等)含量和净化水体重金属污染方面的研究进展。与天然海泡石相比,改性海泡石及其复配具有针对性强、修复效果好和修复范围广等优点。 展开更多
关键词 海泡石 重金属 农产品 水体 污染修复
下载PDF
砷胁迫下接种PGPR对水生植物砷累积及生理特性的影响
16
作者 李圆圆 张文静 李楠 《河南农业科学》 北大核心 2024年第6期67-78,共12页
为探究水生植物芦苇、灯芯草与根围促生细菌(PGPR)组合对重金属污染水体中砷(As)的富集作用以及生理响应,模拟水体As质量浓度(0、5、15、30 mg/L)并添加PGPR菌株荧光假单胞菌(Pseudomonas fluorescens,Pf)、贝莱斯芽孢杆菌(Bacillus vel... 为探究水生植物芦苇、灯芯草与根围促生细菌(PGPR)组合对重金属污染水体中砷(As)的富集作用以及生理响应,模拟水体As质量浓度(0、5、15、30 mg/L)并添加PGPR菌株荧光假单胞菌(Pseudomonas fluorescens,Pf)、贝莱斯芽孢杆菌(Bacillus velezensis,Bv)以及不添加菌株(对照,CK)共设计24个处理。结果表明,低质量浓度As对芦苇、灯芯草生长具有促进作用,而高浓度下产生抑制。添加PGPR能够增加芦苇和灯芯草株高和生物量,提高叶绿素含量以及叶绿素荧光参数,改善芦苇和灯芯草的根系构型并提高根系活力,增加植物地上部和根系的氮吸收量,增强根系对As的富集能力。5 mg/L As质量浓度下,与CK相比,添加Pf处理芦苇株高、生物量、根系氮吸收量和地上部氮吸收量分别增加54.6%、38.5%、11.5%、48.4%,叶绿素总含量增加23.4%,PSⅡ最大光化学效率(Fv/Fm)和PSⅡ潜在活性(Fv/Fo)分别提高6.7%、20.6%,根系总长度、根系总投影面积、根系总体积和根分叉数分别增加4.8%、19.3%、27.4%、14.8%;添加Bv处理芦苇株高、生物量、根系氮吸收量、叶绿素总含量、叶绿素荧光参数以及根系构型参数也有不同程度的提高。5 mg/L As质量浓度下,与CK相比,添加Pf和Bv处理灯芯草株高、生物量、叶绿素含量、叶绿素荧光参数以及根系构型等也有所提高。在30 mg/L As质量浓度下,Pf处理芦苇地上部和根部As含量达到最大值,分别为126.1、432.1 mg/kg。综上,芦苇+Pf对As的吸收和富集效果最好,可应用于重金属As污染水体的生态修复。 展开更多
关键词 芦苇 灯芯草 根围促生细菌 水体污染 叶绿素 根系构型
下载PDF
不同钝化材料对降低农田镉砷污染效果及安全性评估的研究
17
作者 徐霄 张鑫 +2 位作者 章明奎 黄巧玲 尹献远 《中国农学通报》 2024年第17期43-48,共6页
为探讨镉与砷复合污染农田适用的钝化材料,采用盆栽试验,比较研究了赤泥、赤泥+铁粉、玄武岩红泥+石灰石粉、石灰石粉+铁粉和石灰石粉+生物质炭+硫酸亚铁等5种钝化材料对降低水稻籽粒中镉和砷的效果。试验结果揭示了所有测试的钝化材料... 为探讨镉与砷复合污染农田适用的钝化材料,采用盆栽试验,比较研究了赤泥、赤泥+铁粉、玄武岩红泥+石灰石粉、石灰石粉+铁粉和石灰石粉+生物质炭+硫酸亚铁等5种钝化材料对降低水稻籽粒中镉和砷的效果。试验结果揭示了所有测试的钝化材料均能显著改变土壤中镉和砷的化学形态,并降低它们的生物有效性,从而有效减少了水稻籽粒中的镉和砷含量。特别是,以赤泥+铁粉、石灰石粉+铁粉和石灰石粉+生物质炭+硫酸亚铁等3种复合钝化材料的效果最为明显,能够使籽粒中的镉和砷分别降低58%~63%和56%~67%。在试验条件下,5种钝化材料均不会导致土壤质量的明显下降,施用含石灰石粉和生物质炭的钝化材料还有利于降低土壤酸度、增加土壤有机质和阳离子交换量。综合效果,研究表明赤泥+铁粉是一种治理镉砷复合污染农田土壤较为理想的钝化材料。 展开更多
关键词 钝化材料 复合污染 农产品安全 赤泥 铁粉 土壤修复 水稻安全
下载PDF
微污染湖泊水体植物-微生物协同修复技术
18
作者 李世汩 陈文峰 +3 位作者 冯立辉 徐扬帆 郑娇莉 黄小龙 《农业环境科学学报》 CAS CSCD 北大核心 2024年第10期2384-2392,共9页
针对雨水溢流引起的水体微污染的修复,本研究建立了室内微模型模拟雨水溢流污染水体,分别采用投加复合脱氮菌剂、复合脱氮菌剂+镁改性麦饭石,以及复合脱氮菌剂+生态颗粒的方法进行处理,探究不同处理方式对水质、沉水植物苦草及底泥微生... 针对雨水溢流引起的水体微污染的修复,本研究建立了室内微模型模拟雨水溢流污染水体,分别采用投加复合脱氮菌剂、复合脱氮菌剂+镁改性麦饭石,以及复合脱氮菌剂+生态颗粒的方法进行处理,探究不同处理方式对水质、沉水植物苦草及底泥微生物菌群的影响。研究发现,菌剂的投加能够加速微污染水体的修复,同时投加镁改性麦饭石及生态颗粒,能够提升水体氨氮(NH_(4)^(+)-N)、总氮(TN)和化学需氧量(COD)的去除率,并促进苦草生长,其中镁改性麦饭石对苦草与微生物的耦合脱氮促生效果最优。复合脱氮菌剂单独投加,或同时投加镁改性麦饭石或生态颗粒,对底泥细菌群落α多样性影响均不显著。FAPROTAX功能预测表明,Anaerolineaceae等异养硝化-好氧反硝化细菌是苦草与微生物耦合脱氮的主导底泥微生物,镁改性麦饭石及生态颗粒有利于底泥菌群向微生物脱氮功能菌群结构演变,通过植物和微生物协同作用,两处理分别增加苦草叶长26.5%、11.8%,增加根长45.2%、35.5%。 展开更多
关键词 微污染水 脱氮菌剂 苦草 协同修复 麦饭石
下载PDF
艾蒿自然修复砷等重金属复合污染土壤的效果分析
19
作者 覃勇荣 罗美东 +2 位作者 刘旭辉 黄秀连 张治坤 《中国农学通报》 2024年第11期55-67,共13页
为了说明艾蒿在砷等重金属复合污染土壤修复中的作用,以广西某有色金属矿区废弃砒霜冶炼厂周边的艾蒿为研究对象,利用随机采样的方法,采集调查样地中的艾蒿优势种群及其根部土壤样品,对不同采样点艾蒿根部土壤的部分理化指标及艾蒿根茎... 为了说明艾蒿在砷等重金属复合污染土壤修复中的作用,以广西某有色金属矿区废弃砒霜冶炼厂周边的艾蒿为研究对象,利用随机采样的方法,采集调查样地中的艾蒿优势种群及其根部土壤样品,对不同采样点艾蒿根部土壤的部分理化指标及艾蒿根茎叶的重金属含量进行测定,并对艾蒿不同部位的重金属富集系数和转运系数进行比较分析,对根部土壤与艾蒿不同部位重金属含量的相关性进行分析,用单因子污染指数、内梅罗综合污染指数和地累积指数对艾蒿根部土壤的污染状况进行评价。结果表明:(1)采样点土壤重金属污染极为严重,与所在县区土壤背景值相比,艾蒿根部土壤被测重金属元素最大超标倍数分别为As 1582.6、Mn 11.4、Zn 44.3、Cu 32.6、Pb 12.2、Cd 285.7,平均超标倍数分别为As 545.37、Mn 2.60、Zn 7.56、Cu 4.77、Pb 5.50、Cd 80.83。其中,砷和镉的污染最为严重,锌的污染较为严重,铅的污染位居第三,铜的污染相对较轻,锰的污染最轻。(2)艾蒿根部土壤的单项污染指数与地累积指数计算结果基本一致,各采样点艾蒿根部土壤的内梅罗综合污染指数均为重度以上,不同重金属元素污染程度大小排序为:As>Cd>Zn>Pb>Cu。(3)艾蒿能够耐受土壤中多种重金属的复合胁迫,但不是被测重金属元素的超富集植物。(4)艾蒿对Mn、Zn、Cu的富集和转移能力相对较强,可将其转运到地上部分;而对Pb、As、Cd的富集和转运能力较弱,可将其主要囤积在根部。因为艾蒿生物量大,对生境要求不高,既可将土壤中的部分重金属进行稳定化处理,也可以将土壤中的部分重金属进行植物萃取处理,所以,可将其用于重金属复合污染土壤的植物修复。 展开更多
关键词 艾蒿 重金属 复合污染 土壤修复
下载PDF
新型环保化学品在污染防治中的应用研究
20
作者 成丰 林冠 《化肥设计》 CAS 2024年第4期20-22,共3页
通过分析新型环保化学品的类型及特点,重点研究了其在水污染、大气污染和土壤污染防治中的具体应用。研究表明,新型环保化学品因其高效、低毒、可生物降解等优点,在不同污染防治领域展现出独特优势。在水污染防治方面,可提高污染物去除... 通过分析新型环保化学品的类型及特点,重点研究了其在水污染、大气污染和土壤污染防治中的具体应用。研究表明,新型环保化学品因其高效、低毒、可生物降解等优点,在不同污染防治领域展现出独特优势。在水污染防治方面,可提高污染物去除效率;在大气污染防治方面,可实现多污染物协同控制;在土壤污染修复方面,可促进土壤生态功能恢复。因此,新型环保化学品在污染防治中具有广阔的应用前景。 展开更多
关键词 新型环保化学品 水污染 大气污染 土壤污染修复
下载PDF
上一页 1 2 15 下一页 到第
使用帮助 返回顶部