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heavy metal pollution of river water and eco-friendly remediation using potent microalgal species

Water Science and Engineering 2024年第1期17卷 41-50页

作者： Amudham Radha Amal Raj Prabhakaran Mylsamy V.Sivasankar B.Sathish Kumar Kiyoshi Omine T.G.Sunitha Phycological Research Laboratory Research Department of BotanyPachaiyappa's College(Affiliated to University of Madras)Chennai 600030India Research Department of Chemistry Pachaiyappa's College(Affiliated to University of Madras)Chennai 600030India Department of Botany Sri Vidya Mandir Arts&Science College(Autonomous)KatteriUthangarai 636902India Department of Civil Engineering School of Engineering.Nagasaki UniversityNagasaki-Daigaku1-14 Bunkyo-machiNagasaki 8528521Japan

Pollution of rivers is mainly caused by anthropogenic activities such as discharge of effluent from industrial facilities,maintenance of sewage/effluent treatment plants,and dumping of solid waste on river *** study dealt with the pollution issues of the Cooum River in the well-known city of Chennai in South *** samples from 27 locations were collected and analyzed for 12 elements,including Ba,B,and Al,as well as heavy metals such as Pb,Cr,Mn,Fe,Co,Ni,Cu,Zn,and *** samples showed levels of these elements that exceeded World Health Organization *** correlation analysis revealed the inter-dependency among elements,and the contribution of each element based on factor loadings showed its percentage contribution compared to *** samples from six significant locations were chosen for remediation with three algae:Chlorella vulgaris,Scenedesmus dimorphus,and Phormedium *** uptake of pollutants led to the continuous growth of algae during the incubation period of 15 d,effectively removing heavy metals from the river *** increasing levels of algal counts and the chlorophyll a content confirmed the algal growth during the incubation period,followed by a declining stage after the incubation *** scanning electron microscopic images of algae before and after the remediation showed no remarkable modification of morphological *** study showed that the uptake of heavy metals using algae is an effective water pollution remediation measure,making the process practicable in the field on a large scale in the near future.

关键词： heavy metal Cooum river Phycoremediation Microalgae Factor analysis

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Machine learning assisted adsorption performance evaluation of biochar on heavy metal

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Frontiers of Environmental Science & Engineering 2024年第5期18卷 29-42页

作者： Qiannan Duan Pengwei Yan Yichen Feng Qianru Wan Xiaoli Zhu Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity College of Urban and Environmental SciencesNorthwest UniversityXi’an710127China Department of Environment Science Shaanxi Normal UniversityXi’an710062China

heavy metals(HMs)represent pervasive and highly toxic environmental pollutants,known for their long latency periods and high toxicity levels,which pose significant challenges for their removal and ***,the removal of heavy metals from the environment is crucial to ensure the water *** materials,known for their intricate pore structures and abundant oxygen-containing functional groups,are frequently harnessed for their effectiveness in mitigating heavy metal ***,conventional tests for optimizing biochar synthesis and assessing their heavy metal adsorption capabilities can be both costly and *** address this challenge,this paper proposes a data-driven machine learning(ML)approach to identify the optimal biochar preparation and adsorption reaction conditions,with the ultimate goal of maximizing their adsorption *** utilizing a data set comprising 476 instances of heavy metal absorption by biochar,seven classical integrated models and one stacking model were trained to rapidly predict the efficiency of heavy metal adsorption by *** predictions were based on diverse physicochemical properties of biochar and the specific adsorption reaction *** results demonstrate that the stacking model,which integrates multiple algorithms,allows for training with fewer samples to achieve higher prediction accuracy and improved generalization ability.

关键词： Machine learning Biochar heavy metal Adsorption efficiency

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Nanoscale Zero-Valent Iron(nZVI)for heavy metal Wastewater Treatment:A Perspective

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Engineering 2024年第5期36卷 16-20页

作者： Shaolin Li Lei Li Weixian Zhang State Key Laboratory for Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Industries such as non-ferrous metal smelting discharge billions of gallons of highly toxic heavy metal wastewater(HMW)worldwide annually,posing a severe challenge to conventional wastewater treatment plants and harming the *** is traditionally treated via chemical precipitation using lime,caustic,or sulfide,but the effluents do not meet the increasingly stringent discharge *** issue has spurred an increase in research and the development of innovative treatment technologies,among which those using nanoparticles receive particular *** such initiatives,treatment using nanoscale zero-valent iron(nZVI)is one of the best *** nZVI is already well known for its site-remediation use,this perspective highlights its application in HMW treatment with metal *** demonstrate several advantages of nZVI in this wastewater application,including its multifunctionality in sequestrating a wide array of metal(loid)s(>30 species);its capability to capture and enrich metal(loid)s at low concentrations(with a removal capacity reaching 500 mg·g^(-1)nZVI);and its operational convenience due to its unique *** these advantages are attributable to nZVI’s diminutive nanoparticle size and/or its unique iron *** also present the first engineering practice of this application,which has treated millions of cubic meters of HMW and recovered tons of valuable metals(e.g.,Cu and Au).It is concluded that nZVI is a potent reagent for treating HMW and that nZVI technology provides an eco-solution to this toxic waste.

关键词： Nanoscale zero-valent iron Wastewater heavy metal Resource recovery

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heavy metal pollution risk of desulfurized steel slag as a soil amendment in cycling use of solid wastes

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Journal of Environmental Sciences 2023年第5期127卷 349-360页

作者： Fanyi Kong Yuqian Ying Shenggao Lu Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment Key Laboratory of Environmental Remediation and Ecosystem HealthMinistry of EducationCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China

The by-product of wet flue gas desulfurization,desulfurized steel slag(DS),had chemical characteristics like natural gypsum that can be used to improve saline-sodic ***,contamination risk of heavy metals for cycling utilization of DS in agriculturewas concerned *** pot and field experiments were conducted for evaluating the potential pollution risk of DS as the amendment of saline-sodic *** showed that application of DS decreased the contents of Cd,Cu,Zn,and Pb,while significantly increasing chromium(Cr)content in DS-amended *** field experiment demonstrated that the migration of heavy metals(Cd,Zn,Cu,and Pb)in the soil profile was *** application of DS at the dosage of 22.5–225 tons/ha significantly increased the Cr content in alfalfa(Medicago sativa L.)but lower than the national standard for feed in China(GB 13078-2017).DS altered the chemical fraction of heavy metals(Zn,Cu,and Pb),transferred exchangeable,reducible into oxidizable and residual forms in DS-amended *** of DS combined with fulvic acid(FA)could effectively reduce the movement of heavy metals in soil and the accumulation of Cr in *** on our results,DS was a safe and feasible material for agricultural use and presented relatively little pollution risk of heavy ***,the results also showed that DS to a certain extent had a potential environmental risk of Cr if larger dosages of DS were used.

关键词： Desulfurized steel slag(DS) heavy metal Chromium(Cr) Saline-sodic soil Soil amendment Environmental risk

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heavy metal Remediation in Sludge Compost: Recent Progress

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Journal of Renewable Materials 2022年第2期10卷 469-486页

作者： Rongwei Xiong Xiufang Gao Xinyue Tu Yilin Mao Li Jiang Lu Zheng Yitong Du Yangtze University Wuhan430100China Engineering Research Center of Ecology and Agricultural Use of Wetland Ministry of EducationJingzhou434025China School of Environmental Science&Engineering Hubei Polytechnic UniversityHuangshi435003China

The safe and efficient disposal and utilization of sludge are major issues to be solved in solid waste treatment and environmental protection due to the complex characteristics of sludge and the low rate of innocuous *** is a process of decomposing organic matter and transformed low-molecular organic acids into high-molecular humus substances under the action of *** land-use after composting has become an important direction for sludge treatment,heavy metal pollution is still the bottleneck problem restrict-ing land use of sludge *** zeolite,hydroxyapatite,and other conditioning agents to the composting process affects the concentration or form of some heavy metals and effectively reduces the environmental *** and phosphorus modifiers change heavy metal speciation in samples,playing a role in decreasing biological availability and *** this study,the effects of sludge composting treatment and conditioning agents on the concentrations and forms of heavy metals are *** review will provide a theoretical basis to treat heavy metals in sludge composting and lay the foundation for the land utilization and waste recycling of sludge.

关键词： Sludge compost heavy metal conditioning agents remediation

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Sulfur mediated heavy metal biogeochemical cycles in coastal wetlands:From sediments,rhizosphere to vegetation

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 165-182页

作者： Yueming Wu Zhanrui Leng Jian Li Chongling Yan Xinhong Wang Hui Jia Lingyun Chen Sai Zhang Xiaojun Zheng Daolin Du Institute of Environment and Ecology School of the Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China Laboratory of Microbiota College of Life ScienceNorthwest Normal UniversityLanzhou 730070China Department of Physics and Electronic Engineering Jiangsu UniversityZhenjiang 212013China

The interactions and mechanisms between sulfur and heavy metals are a growing focus of biogeochemical studies in coastal *** issues underline the fate of heavy metals bound in sediments or released into the system through *** the fact that numerous published studies have suggested sulfur has a significant impact on the bioavailability of heavy metals accumulated in coastal wetlands,to date,no review article has systematically summarized those studies,particularly from the perspective of the three major components of wetland ecosystems(sediments,rhizosphere,and vegetation).The present review summarizes the studies published in the past four decades and highlights the major achievements in this *** and studies available thus far indicate that under anaerobic conditions,most of the potentially bioavailable heavy metals in coastal wetland sediments are fixed as precipitates,such as metal ***,fluctuations in physicochemical conditions may affect sulfur cycling,and hence,directly or indirectly lead to the conversion and migration of heavy *** the rhizosphere,root activities and microbes together affect the speciation and transformation of sulfur which in turn mediate the migration of heavy *** for plant tissues,tolerance to heavy metals is enhanced by sulfur-containing compounds via promoting a series of chelation and detoxification ***,to further understand the interactions between sulfur and heavy metals in coastal wetlands,some major future research directions are proposed.

关键词： Coastal wetland heavy metal Sulfur Biogeochemical cycle

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Recent progress in electrospun nanofibers and their applications in heavy metal wastewater treatment

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Frontiers of Chemical Science and Engineering 2023年第3期17卷 249-275页

作者： Xizi Xu He Lv Mingxin Zhang Menglong Wang Yangjian Zhou Yanan Liu Deng-Guang Yu School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Engineering Technology Research Center for High-Performance Medical Device Materials Shanghai 200093China

Novel adsorbents with a simple preparation process and large capacity for removing highly toxic and nondegradable heavy metals from water have drawn the attention of *** nanofiber membranes usually have the advantages of large specific surface areas and high porosity and allowing flexible control and easy *** membranes show remarkable application potential in the field of heavy metal wastewater *** this paper,the electrospinning technologies,process types,and the structures and types of nanofibers that can be prepared are reviewed,and the relationships among process,structure and properties are *** one hand,based on the different components of electrospun nanofibers,the use of organic,inorganic and organic−inorganic nanofiber membrane adsorbents in heavy metal wastewater treatment are introduced,and their advantages and future development are summarized and *** the other hand,based on the microstructure and overall structure of the nanofiber membrane,the recent progresses of electrospun functional membranes for heavy metal removal are reviewed,and the advantages of different structures for applications are ***,this study lays the foundation for future research aiming to provide more novel structured adsorbents.

关键词： electrospinning heavy metal adsorption nanostructure wastewater

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Occurrence,leaching behavior,and detoxification of heavy metal Cr in coal gasification slag

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Chinese Journal of Chemical Engineering 2023年第6期58卷 11-19页

作者： Jiangshan Qu Jianbo Zhang Huiquan Li Shaopeng Li Da Shi Ruiqi Chang Wenfen Wu Ganyu Zhu Chennian Yang Chenye Wang CAS Key Laboratory of Green Process and Engineering National Engineering Research Center of Green Recycling for Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100090China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China

Coal gasification slag(CGS)is a type of solid waste produced during coal gasification,in which heavy metals severely restrict its resource *** this work,the mineral occurrence and distribution of typical heavy metal Cr in CGS is *** leaching behavior of Cr under different conditions is studied in *** leaching-selective oxidation-coprecipitation method is proposed based on the characteristics of Cr in *** detoxification of Cr in CGS is realized,and the detoxification mechanism is *** show that Cr is highly enriched in *** speciation of Cr is mainly residual fraction(74.47%-86.12%),which is combined with amorphous ***^(3+)and Cr^(6+)account for 90.93%-94.82%and 5.18%-9.07%of total Cr,*** acid concentration and high liquid-solid ratio are beneficial to destroy the lattice structure of amorphous aluminosilicate,thus improving the leaching efficiency of Cr,which can reach 97.93%under the optimal *** leaching-selective oxidation-coprecipitation method can realize the detoxification of Cr in *** the optimal conditions,the removal rates of Fe^(3+)and Cr^(3+)in the leaching solution are 80.99%-84.79%and 70.58%-71.69%,respectively,while the loss rate of Al^(3+)is only 1.10%-3.35%.Detoxification slag exists in the form of Fe-Cr coprecipitation(Fe_(1-x)Cr_xOOH),which can be used for *** detoxification acid leaching solution can be used to prepare inorganic polymer composite coagulant poly-aluminum chloride(PAC).This study can provide theoretical and data guidance for detoxification of heavy metal Cr in CGS and achieve resource utilization of coal gasification solid waste.

关键词： Coal gasification slag heavy metal Distributions Leaching Detoxification Precipitation

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Unraveling biochar surface area on structure and heavy metal removal performances of carbothermal reduced nanoscale zero-valent iron

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Journal of Bioresources and Bioproducts 2023年第4期8卷 388-398页

作者： Tharindu N.Karunaratne Prashan M.Rodrigo Daniel O.Oguntuyi Todd E.Mlsna Jilei Zhang Xuefeng Zhang Department of Sustainable Bioproducts Mississippi State UniversityMississippi StateMS 39762USA Department of Chemistry Mississippi State UniversityMississippi StateMS 39762USA

Carbothermal reduction using biochar(BC)is a green and effective method of synthesizing BCsupported nanoscale zero-valent iron(nanoFe^(0))***,the effect of BC surface area on the structure,distribution,and performance such as the heavy metal uptake capacity of nanoFe^(0)particles remains *** stover-based BCs with different surface areas(1.7−1472 m^(2)/g)were prepared in this *** have been used for in-situ synthesis BCs-supported nanoFe^(0)particlesthrough carbothermal reduction of ferrous *** BCs-supported nanoFe^(0)particles were found to be covered with graphene shells and dispersed onto BC surfaces,forming the BC-supported graphene-encapsulated nanoFe^(0)(BC-G@Fe^(0))*** graphene shells covering the nanoFe^(0)particles were formed because of gaseous carbon evolved from biomass carbonization reacting with iron oxides/iron *** BC surface area decreased the average diameters of nanoFe^(0)particles,indicating a higher BC surface area alleviated the aggregation of nanoFe^(0)particles,which resulted in higher heavy metal uptake *** the optimized condition,BC-G@Fe^(0)composite exhibited uptake capacities of 124.4,121.8,254.5,and 48.0 mg/g for Cu^(2+),Pb^(2+),Ag^(+),and As^(3+),respectively(pH 5,25℃).Moreover,the BC-G@Fe^(0)composite also demonstrated high stability for Cu^(2+)removal from the fixed-bed continuous flow,in which 1 g of BC-G@Fe^(0)can work for 120 h in a 4 mg/L Cu^(2+)flow continually and clean 28.6 L Cu^(2+)contaminated ***,the BC-G@Fe^(0)composite can effectively immobilize the bioavailable As^(3+)from the contaminated soil,i.e.,5%(w)of BC-G@Fe^(0)composite addition can immobilize up to 92.2%bioavailable As^(3+)from the contaminated soil.

关键词： Carbothermal reduction Nanoscale zero-valent iron heavy metal Fix-bed sorption Soil remediation

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Effect of Zn^(2+)-Cu^(2+)combined heavy metal on mechanical properties and microstructure of clayey soil

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Journal of Mountain Science 2022年第9期19卷 2556-2569页

作者： MA Qiang WU Nian-ze XIAO Heng-lin LI Wen-tao XIANG Jun-chen School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan 430068China Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes Hubei University of TechnologyWuhan 430068China School of Resources and Civil Engineering Northeastern UniversityShenyang 10819China Science and Technology Innovation Center for Smart Water Conservancy and Resources and Environment Northeastern UniversityShenyang 10819China

The strength deterioration mechanism of soil polluted by heavy metals plays a crucial role in the research of mine site *** this study,an unconfined compressive strength(UCS)test,a pH test,a scanning electron microscopy(SEM)test,a low filed nuclear magnetic resonance(NMR)test,and an X-ray diffraction(XRD)test were conducted on Zn^(2+),Cu^(2+) and the combination of Zn^(2+) and Cu^(2+) polluted soil to investigate the strength deterioration *** results show that both the UCS and pH value of soil decrease with increasing heavy metal *** UCS of Zn^(2+)-Cu^(2+) combined polluted soil is between Zn^(2+) and Cu^(2+) polluted soil at the same total ***,the deterioration rate of combined heavy metal polluted soil is less than the sum of deterioration rate of the two single polluted soils at the same total *** addition,heavy metal cations in polluted soil cause flocculent gels of cosmids to shrink,the micropores to become smaller and the macropores to become *** porosity increases slightly with the increase of heavy metal concentration due to decreased pH *** results from SEM,low field NMR,and pH could explain the dynamic evolution process of soil structure with different heavy metals and concentrations,which provides an experimental basis for mine-site polluted heavy metal treatment technology and the prediction of clayey soil strength deterioration.

关键词： Combined polluted soil Mechanical properties Pore size distribution Microstructure heavy metal

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