scholarly journals Adsorption of heavy metal by natural clayey soil

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Wawan Budianta
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Soil Sample ◽  
Waste Disposal ◽  
Clayey Soil ◽  
Batch Experiment ◽  
Concentrated Solutions ◽  
Retention Capacity ◽  
Metal Retention ◽  
Soil Batch

This study focused on the capability of Clayey soil to retain and release heavy metals. Batch experiment for sample of clayey soil was conducted with several concentrated solutions of heavy metals. The results show that the clayey soil sample may have a relatively high heavy metal retention capacity. This is particularly positive in the context of municipal waste disposal (landfills) in Indonesia Keywords: Adsorption, heavy metal, clayey soil, batch experiment

scholarly journals Strippable Polymeric Nanocomposites Comprising “Green” Chelates, for the Removal of Heavy Metals and Radionuclides

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4194
Author(s):  
Gabriela Toader ◽  
Daniela Pulpea ◽  
Traian Rotariu ◽  
Aurel Diacon ◽  
Edina Rusen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Complexing Agents ◽  
Mechanical And Thermal Properties ◽  
Polymeric Nanocomposites ◽  
Retention Capacity ◽  
Metal Retention ◽  
Removal Of Heavy Metals ◽  
Iminodisuccinic Acid ◽  
Minimal Environmental Impact

The issue of heavy metal and radionuclide contamination is still causing a great deal of concern worldwide for environmental protection and industrial sites remediation. Various techniques have been developed for surface decontamination aiming for high decontamination factors (DF) and minimal environmental impact, but strippable polymeric nanocomposite coatings are some of the best candidates in this area. In this study, novel strippable coatings for heavy metal and radionuclides decontamination were developed based on the film-forming ability of polyvinyl alcohol, with the remarkable metal retention capacity of bentonite nanoclay, together with the chelating ability of sodium alginate and with “new-generation” “green” complexing agents: iminodisuccinic acid (IDS) and 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC). These environmentally friendly water-based decontamination solutions are capable of generating strippable polymeric films with optimized mechanical and thermal properties while exhibiting high decontamination efficiency (DF ≈ 95–98% for heavy metals tested on glass surface and DF ≈ 91–97% for radionuclides 241Am, 90Sr-Y and 137Cs on metal, painted metal, plastic, and glass surfaces).

Applications of Bentonite to Soil Decontamination

2018 ◽  
Vol 69 (7) ◽  
pp. 1695-1698
Author(s):  
Marin Rusanescu ◽  
Carmen Otilia Rusanescu ◽  
Gheorghe Voicu ◽  
Mihaela Begea
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Laboratory Experiments ◽  
Experimental Studies ◽  
Heavy Metal Concentration ◽  
Polluted Soil ◽  
Raw Material ◽  
Soil Decontamination ◽  
Metal Retention ◽  
Removal Of Heavy Metals

A calcium bentonite from Orasu Nou deposit (Satu Mare Romania) was used as raw material. We have conducted laboratory experiments to determine the influence of bentonite on the degree of heavy metal retention. It has been observed that the rate of retention increases as the heavy metal concentration decreases. Experimental studies have been carried out on metal retention ( Zn) in bentonite. In this paper, we realized laboratory experiments for determining the influence of metal (Zn) on the growth and development of two types of plants (Pelargonium domesticum and Kalanchoe) and the effect of bentonite on the absorption of pollutants. These flowers were planted in unpolluted soil, in heavy metal polluted soil and in heavy metal polluted soil to which bentonite was added to observe the positive effect of bentonite. It has been noticed that the flowers planted in unpolluted soil and polluted with heavy metals to which bentonite has been added, the flowers have flourished, the leaves are still green and the plants whose soils have been polluted with heavy metals began to dry after 6 days, three weeks have yellowish leaves and flowers have dried. Experiments have demonstrated the essential role of bentonite for the removal of heavy metals polluted soil.

scholarly journals INVESTIGATION OF INFLUENCE OF LAPES LANDFILL LEACHATE ON GROUND AND SURFACE WATER POLLUTION WITH HEAVY METALS/LAPIŲ SĄVARTYNO FILTRATO ĮTAKOS APLINKOS PAVIRŠINIŲ IR POŽEMINIŲ VANDENŲ UŽTERŠTUMUI SUNKIAISIAIS METALAIS TYRIMAI/ ИССЛЕДОВАНИЕ ЗАГРЯЗНЕНИЯ ПОВЕРХНОСТНЫХ И ПОДЗЕМНЫХ ВОД ТЯЖЕЛЫМИ МЕТАЛЛАМИ ИЗ ФИЛЬТРАТА СВАЛКИ В ЛАПЕС

2009 ◽  
Vol 17 (3) ◽  
pp. 131-139 ◽  
Author(s):  
Bronius Jaskelevičius ◽  
Vaida Lynikienė
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Waste Disposal ◽  
Industrial Waste ◽  
Iron Concentration ◽  
Chemical Properties ◽  
Biological Interactions ◽  
Paper Properties ◽  
Toxic Compounds ◽  
The Third

As a result of global and intense production the waste disposal problems become more and more urgent. Waste processing, utilization and recycling is to a certain extent limited by many economic, organisational and technological factors, and this inevitably encourages waste disposal in landfills. Physical, chemical and biological interactions in landfill cell result in formation of landfill gas and harmful leachate. Because of lack of control, together with usual communal waste, industrial waste was also dumped to landfills, therefore gas and leachate produced include large amounts of toxic compounds. Once hazardous waste materials occured in landfills, later they vastly expanded the whole spectrum of toxic materials and compounds. In the landfill environment chemical properties of surface and ground water and concentration of separate components are governed by seepage of leachate and industrial solutants into soil and ground layers and their transport by subsurface waters. Influence on the environment exerted by heavy metals contained in the leachate of Lapes Landfill is discussed in this paper. Properties of industrial waste material influenced order of the main pollutants: the most important elements in this case are Cu, Ni, Zn, Pb, Mn, Cr and other ions, the sulphides of these metals and other toxic compounds. The First Landfill field is more polluted with heavy metal polutants than the Third field. In all the samples iron concentration is the greatest exceeding even 200 times the admissible value allowed (Norm HN 24:2003). Sources (springs) S11 and S17 are least contaminated with heavy metals. The greatest groundwater pollution was found in monitoring bore G13s. The leachate processed in purification devices is released to the Third stream. Heavy metal concentrations in waters of this stream are low and they further decrease downstream because the pollutants are diluted. Santrauka Masiškai gaminant produkciją, ją vartojant, vis opesnė tampa atliekų problema. Atliekų perdirbimą, utilizavimą iš dalies ribojantys ekonominiai, organizaciniai bei technologiniai veiksniai neišvengiamai skatina atliekas šalinti į sąvartynus. Dėl sąvartyno tūryje vykstančių fizinių, cheminių bei biologinių reakcijų susidaro sąvartyno dujos ir kenksmingas filtratas. Kadangi dėl nepakankamos kontrolės į sąvartynus kartu su buitinėmis, komunalinėmis atliekomis buvo šalinamos pramonės atliekos, susidarančiose dujose bei filtrate yra daug toksiškų junginių. Šią toksinių medžiagų bei junginių įvairovę dar labiau papildo į sąvartynus patenkančios pavojingos atliekos. Gruntinio ir paviršinio upelių vandens cheminę sudėtį ir kai kurių komponentų koncentraciją sąvartyno aplinkoje lemia filtrato ir pramoninių tirpalų įsisunkimo į gruntą mastas bei požeminių tėkmių pernašos. Straipsnyje nagrinėjama Lapių sąvartyno filtrate aptiktų sunkiųjų metalų įtaka aplinkai. Pramonės atliekos lėmė, kad filtrato pagrindiniai teršiantieji elementai yra Cu, Ni, Zn, Pb, Mn, Cr ir kt. jonai, šių metalų sulfidai ir kiti toksiniai junginiai. Pirmasis kaupimosi laukas yra labiau užterštas sunkiaisiais metalais nei trečiasis laukas. Visuose mėginiuose didžiausia yra geležies koncentracija. Ji net iki 200 kartų viršija HN 24:2003 leidžiamąją normą. Mažiausiai sunkiaisiais metalais užteršti šaltiniai (S11 ir S17 postai). Požeminis vanduo labiausiai užterštas G13s gręžinyje. Iš valymo įrenginių išvalytas filtratas yra išleidžiamas į upelį. Šio upelio vandenyje rastų sunkiųjų metalų koncentracijos yra nedidelės, o upeliui tekant tolyn teršalai atskiedžiami, ir metalų koncentracijos mažėja. Резюме Массовое производство продукции, пользование ею все более обостряют проблему отходов. Процессы переработки и утилизации отходов, в определенной степени ограничивающие экономические, организационные и технологические факторы, неизбежно способствуют интенсификации удаления отходов на свалки. На свалках отходов в результате протекающих физических, химических и биологических реакций образуются газы и токсичный фильтрат. Поскольку из-за недостаточного контроля на свалку вместе с бытовыми, коммунальными отходами удалялись и промышленные отходы, в составе образующихся газов и фильтрата имеется много токсичных соединений. Опасные отходы еще более увеличили спектр токсичных материалов и соединений в газах и фильтрате свалки. Химический состав и концентрация отдельных компонентов грунтовых и поверхностных вод в районе свалки определяют проникновение фильтрата и промышленных растворов в грунт и их перенос подземными течениями. В статье изучается влияние тяжелых металлов из фильтрата свалки в Лапес на состояние вод в районе свалки. Промышленные отходы способствовали появлению в фильтрате ионов основных загрязняющих элементов Cu, Ni, Zn, Pb, Mn, Cr, сульфидов этих металлов и других токсичных соединений. Первое поле накопления отходов в большей степени загрязнено тяжелыми металлами, чем третье поле. Во всех опытных образцах воды отмечена самая большая концентрация ионов железа, почти в 200 раз превышающая допустимую норму HN 24:2003. Наименьшее загрязнение тяжелыми металлами отмечено в подземной воде источников (посты S11 и S17). Грунтовые воды больше всего загрязнены в скважине G13s. Поверхностные воды ручьев, в которые проникает фильтрат, а также сливается очищенный фильтрат, содержат небольшие концентрации тяжелых металлов, которые разбавляются течением и уменьшаются.

scholarly journals Heavy Metal Assessment of Kavre Valley Basin River System

2019 ◽  
Vol 24 ◽  
pp. 32-34
Author(s):  
Siddhartha Shakya ◽  
Prekshya Gurung ◽  
Anjal Bohaju ◽  
Dipson Ojha ◽  
Bhim Prasad Kafle
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Population Growth ◽  
Waste Disposal ◽  
River System ◽  
City Size ◽  
Uv Spectrophotometry ◽  
Heavy Metal Assessment ◽  
Valley River ◽  
Basin System

Recent population growth, industrialization and unplanned urbanization have led to an increase in untreated waste disposal directly to the river system, including heavy metals. The present investigation was conducted for assessment of heavy metals in the Kavre valley river basin system. Through this basin, two major rivers Punyamata and Roshi along with their tributaries, flow passing through cities (Banepa, Shree Khandapur and Panauti) and the heavy metals selected were Iron (Fe), Chromium (Cr), Manganese (Mn), Lead (Pb), Zinc (Zn) and Cadmium (Cd). Seven sites were selected on the basis of city size and meeting point of tributaries. Fe, Cr and Mn were examined using UV-spectrophotometry whereas Pb, Zn and Cd were determined using AAS. The highest concentration of Cr, Mn, Fe, Cd, Zn, Pb were determined to be 1.9 μg/L, 22.6 μg/L, 514 μg/L, 340 μg/L, 20 μg/L, 80 μg/L, respectively, with Fe, Cd and Pb exceeding the WHO limits.

Quantification of heavy metals in agricultural soils: the influence of sieving in standard analytical methods

2020 ◽  
Author(s):  
Anne Karine Boulet ◽  
Adelcia Veiga ◽  
Carla Ferreira ◽  
António Ferreira
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Soil Sample ◽  
Analytical Methods ◽  
Agricultural Soils ◽  
Soil Samples ◽  
Metal Concentrations ◽  
Aqua Regia ◽  
Heavy Metal Concentrations ◽  
Pre Treatment

<p>Conservation of agriculture soils is a topic of major concern, namely through the increase of soil organic matter. SoilCare project (https://www.soilcare-project.eu/) aims to enhance the quality of agricultural soils in Europe, through the implementation and testing of Soil Improving Cropping Systems in 16 study sites. In Portugal, the application of urban sewage sludge amendments in agriculture soils has been investigated. However, this application is a sensitive topic, due to the risk of long term accumulation of heavy metals and consequent contamination of the soil. The recent Portuguese legislation (Decret-Law 103/2015) is more restrictive than the precedent one (Decret-Law 276/2009) in terms of maximum concentrations of heavy metals in agricultural soils. The analytical quantification of heavy metals, however, raises some methodological questions associated with soil sample pre-treatment, due to some imprecisions in standard analytical methods. For example, the ISO 11466 regarding the extraction in Aqua Regia provides two pre-treatment options: (i) sieve the soil sample with a 2 mm mesh (but if mass for analyses is <2g, mill and sieve the sample <250µm is required), or (ii) mill and sieve the soil sample through a 150µm mesh. On the other hand, the EN 13650 requests soil samples to be sieved at 500µm. Since heavy metals in the soil are usually associated with finer particles, the mesh size used during the pre-treatment of soil samples may affect their quantification.</p><p>This study aims to assess the impact of soil particle size on total heavy metal concentrations in the soil. Soil samples were collected at 0-30cm depth in an agricultural field with sandy loam texture, fertilized with urban sludge amendment for 3 years. These samples were then divided in four subsamples and sieved with 2mm, 500µm, 250µm and 106µm meshes (soil aggregates were broken softly but soil wasn’t milled). Finer and coarser fractions were weighted and analyzed separately. Heavy metals were extracted with Aqua Regia method, using a mass for analyze of 3g, and quantified by atomic absorption spectrophotometer with graphite furnace (Cd) and flame (Cu, Ni, Pb, Zn and Cr).</p><p>Except for Cu, heavy metals concentrations increase linearly with the decline of the coarser fraction. This means that analyzing heavy metals content only in the finest fractions of the soil leads to an over estimation of their concentrations in the total soil. Results also show that coarser fractions of soil comprise lower, but not negligible, concentrations of heavy metals. Calculating heavy metal concentrations in the soil based on the weighted average of both fine and coarse fractions and associated concentrations, provide similar results to those driven by the analyses of heavy metals in the <2mm fraction. This indicates that milling and analyzing finer fractions of the soil did not influence the quantification of heavy metals in total soil. Clearer indications on analytical procedures should be provided in analytical standards, in order to properly assess heavy metal concentrations and compare the results with soil quality standards legislated.  </p>

scholarly journals ANALISIS KANDUNGAN LOGAM BERAT Pb DAN Cd DI MUARA SUNGAI MANGGAR BALIKPAPAN

2018 ◽  
Vol 12 (2) ◽  
pp. 117
Author(s):  
Godfrida Any Yusriana Dewi ◽  
Steven A Samson ◽  
Usman Usman
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Waste Disposal ◽  
Metal Contamination ◽  
Metal Content ◽  
Heavy Metal Contamination ◽  
Aquatic Organisms ◽  
The Body ◽  
Metal Bioaccumulation ◽  
Heavy Metal Bioaccumulation

Human activities around the estuary of the Manggar river in Balikpapan produce waste disposal and cause heavy metal contamination such as lead (Pb) and cadmium (Cd) in water bodies. The contaminant can endanger the life of aquatic organisms. It can also occurs heavy metal bioaccumulation in the body of the aquatic organisms. The results show that the heavy metal content of Pb and Cd in water, sediment and water biota indicated that the estuary of the Manggar River was contaminated by heavy metals. The content of Pb and Cd in water is 0.276 mg/l and 0.020 mg/l, in sediments is 24.7 mg/kg and 4.52 mg/kg, and in the biota is 4.20 mg/kg and 0.80 mg/kg. This means that fish and shells taken from the waters around the estuary of the Manggar River are not safe for consumption because they can interfere the human health.

Hydroxyapatite Nanoparticles for Acidic Mine Waters Remediation

2019 ◽  
Vol 70 (9) ◽  
pp. 3167-3175
Author(s):  
Claudia Maria Simonescu ◽  
Daniela Cristina Culita ◽  
Virgil Marinescu ◽  
Christu Tardei ◽  
Dorinel Talpeanu
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Specific Surface ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Mining Activities ◽  
Retention Capacity ◽  
Synthesis Conditions ◽  
Mining Wastewater

Mining activities have a high negative impact on the environment and on human health. Environmental impacts can result in contamination of surface water, groundwater, soil and air. Large volumes of wastewater produced by mining activities have to be remediated before being discharged into the environment. Due to the complex composition of wastewater coming from the mining industry and because their negative impacts, numerous remediation techniques have been applied. Adsorption is one of the most extensively used ways to remediate mining wastewater as a consequence of its low cost, easiness to be performed, and also due to the wide variety of materials (natural and synthetic) that can be use as adsorbents. Hydroxyapatite (HAP, Ca10(PO4)6(OH)2), a naturally occurring form of calcium phosphate has a good capacity to remove heavy metal ions from aqueous solutions due to its excellent properties. By preparing hydroxyapatite using different synthesis methods, its properties can be manipulated in order to increase the adsorption properties and reactivity. Herein, we reported synthesis of hydroxyapatite (HAP) samples using different synthesis conditions to establish the effect of synthesis conditions onto HAP properties. The HAP samples prepared have been characterized by the use of X-ray diffraction, FT-IR spectroscopy, specific surface measurements, Scanning Electron Microscopy (SEM). The stoichiometric compounds with high degree of crystallinity, low average particle diameter values, and low specific surface have been prepared by the solid state reaction and high calcination temepratures. The addition of surfactant (dispersant) has resulted in an increase in the specific surface area, which will result in an increase in the retention capacity of heavy metal ions in wastewater. The adsorbents prepared were used to remediate mine water. Results showed that non-calcinated HAP samples have a higher heavy metals adsorption capacity compared to HAP samples calcinated at 600 �C and 900 �C. The HAP samples prepared in presence of surfactant exhibit a higher heavy metals adsorption capacity than samples prepared in absence of surfactant. The values of the retention capacity differ depending on the nature of the metal ion: QMn(II) ] QFe(III) ] QZn(II) ] QPb(II) ] QNi(II). A change in the pH of mine water from 2.6 to 5.5 has occur that means that the metal ion retention mechanism goes through chemical reactions. The metal ions retention capacity suggests application of hydroxyapatite for remediation of mining wastewater.

scholarly journals The Effect of Different Cleaning Methods on Needles for Assessing the Atmospheric Heavy Metal Retention Capacity of Three Coniferous Trees

2021 ◽  
Vol 11 (4) ◽  
pp. 1668
Author(s):  
Tong Liu ◽  
Mei Zhang ◽  
Yihan Wang ◽  
Lili Tang ◽  
Kefan Wang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Urban Air Pollution ◽  
Retention Capacity ◽  
Cedrus Deodara ◽  
Metal Retention ◽  
Water Washing ◽  
Juniperus Chinensis ◽  
Accumulation Index ◽  
Ethanol Washing ◽  
Cleaning Methods

Urban air pollution has received increasing attention in recent years. To investigate the interaction between several heavy metal elements and the degree of atmospheric pollution, the leaves of three evergreen tree species—Chinese juniper (Juniperus chinensis L.), dragon juniper (Juniperus chinensis L. ‘Kaizuca’), and cedar (Cedrus deodara (Roxb. ex D.Don) G.Don)—were collected from main road intersections in the urban area of Tianjin, China. Two different treatments—water washing (WW) and ethanol washing (EW)—were used, and the contents of Cu, Mn, Cd, and Zn were measured in both washed and unwashed (UW) leaves. It was found that the heavy metal contents within Chinese juniper and dragon juniper were ranked as Mn > Zn > Cu > Cd, and the metal accumulation index (MAI) value was higher for dragon juniper. For the three plants, water washed off 5.36% to 58.58% of the total heavy metals in the needles, while ethanol washed off 16.08% to 71.60% of the total. Both washes were more effective for Cu, Zn, and Cd, and especially for the element Cd. Ethanol could clean off 38.64% to 71.60% of the total Cd from the leaves. Ethanol had a better elution effect compared to water, and the trend of the Cd content in the leaves of the three plants showed a change after the use of different washing methods, which suggests that the water washing may have masked the real difference.

scholarly journals Heavy Metal Immobilization Studies and Enhancement in Geotechnical Properties of Cohesive Soils by EICP Technique

2020 ◽  
Vol 10 (21) ◽  
pp. 7568
Author(s):  
Arif Ali Baig Moghal ◽  
Mohammed Abdul Lateef ◽  
Syed Abu Sayeed Mohammed ◽  
Munir Ahmad ◽  
Adel R.A. Usman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Cohesive Soils ◽  
Retention Capacity ◽  
Reliable Technique ◽  
Landfill Liner ◽  
Permeability Characteristics ◽  
In Situ Conditions ◽  
Contaminant Remediation ◽  
Multiple Heavy Metals

Soil treatment methods to cope with ever-growing demands of construction industry and environmental aspects are always explored for their suitability in different in-situ conditions. Of late, enzyme induced calcite precipitation (EICP) is gaining importance as a reliable technique to improve soil properties and for contaminant remediation scenarios. In the present work, swelling and permeability characteristics of two native Indian cohesive soils (Black and Red) are explored. Experiments on the sorption and desorption of multiple heavy metals (Cd, Ni and Pb) onto these soils were conducted to understand the sorptive response of the heavy metals. To improve the heavy metal retention capacity and enhance swelling and permeability characteristics, the selected soils were treated with different enzyme solutions. The results revealed that EICP technique could immobilize the heavy metals in selected soils to a significant level and reduce the swelling and permeability. This technique is contaminant selective and performance varies with the nature and type of heavy metal used. Citric acid (C6H8O7) and ethylene diamine tetra-acetic acid (EDTA) were used as extractants in the present study to study the desorption response of heavy metals for different EICP conditions. The results indicate that calcium carbonate (CaCO3) precipitate deposited in the voids of soil has the innate potential in reducing the permeability of soil up to 47-fold and swelling pressure by 4-fold at the end of 21 days of curing period. Reduction in permeability and swell, following EICP treatment can be maintained with one time rinsing of the treated soil in water to avoid dissolution of precipitated CaCO3. Outcomes of this study have revealed that EICP technique can be adopted on selected native soils to reduce swelling and permeability characteristics followed by enhanced contaminant remediation enabling their potential as excellent landfill liner materials.

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