scholarly journals Characterization of heavy metal in soils as affected by long-term irrigation with industrial wastewater

2018 ◽  
Vol 9 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Bushra Haroon ◽  
An Ping ◽  
Arshid Pervez ◽  
Faridullah ◽  
Muhammad Irshad
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Industrial Effluent ◽  
Contamination Level ◽  
Ph Values ◽  
Exchangeable Fraction ◽  
Irrigated Soils ◽  
Exchangeable Form

AbstractInvestigation of heavy metals (HM) fractions in soils irrigated with wastewater (WW) would ascertain their bioavailability and contamination level in soils. This study investigated HM fractions in soils after long-term WW irrigation. WW irrigation profoundly affected HM fractions in soil. The ranges of HM concentrations in soils irrigated with WW were apparently wide. All fractions were significantly higher in the fields irrigated with industrial WW than rain-fed fields. HM concentrations varied in the soils as Pb > Cu > Ni > Zn > Fe > Cd > Mn after WW irrigation. In rainfed fields, HM concentrations differed in soils as Fe > Zn > Mn > Pb > Cd > Cu > Ni. The HM fractions were dominant in the residual form followed by oxides bound and carbonate associated fractions in WW-irrigated soils. Lower contents of HM in the soil were obtained in the exchangeable fraction. WW irrigation resulted in the transformation of HM into different fractions as residual > oxide associated > carbonate associated > organically bound > exchangeable form. Repeated WW irrigation increased pH values of the soils. The higher EC of soil indicated an accumulation of salts in the soils due to WW irrigation. Mitigation of HM contamination in Hattar industrial effluent is required before irrigation.

Evaluating the mobile heavy metal pool in soakaway sediment, road dust and soil through sequential extraction and isotopic exchange

2010 ◽  
Vol 62 (4) ◽  
pp. 920-928 ◽  
Author(s):  
Manish Kumar ◽  
Hiroaki Furumai ◽  
Futoshi Kurisu ◽  
Ikuro Kasuga
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Sequential Extraction ◽  
Isotopic Exchange ◽  
Road Dust ◽  
Weak Acid ◽  
Isotopic Dilution ◽  
Contamination Level ◽  
Isotopic Tracers ◽  
Exchangeable Fraction

Selective sequential dissolution (SSD) and isotopic dilution are two most commonly applied techniques for the measurement of mobile fraction of heavy metal present in the urban environment. This work examined the compliance between SSD proposed by the Community Bureau of Reference (BCR) and isotopic dilution technique (IDT) for determination of mobile pool of heavy metal contained in soakaway sediment, road dust, and soil sample. Heavy metals (Cu, Zn, Cd and Pb) were fractionated using the three-stage BCR protocol, while isotopically exchangeable metal concentrations (E-value) were investigated through isotopic tracers (111Cd, 65Cu, 207Pb and 66Zn). In general, total contamination level, E-value and BCR exchangeable fractions of different samples followed the similar order of road dust > soakaway sediment > soil. Results revealed that the E-value exceeded the BCR exchangeable fraction in all samples. In addition, the first three fractions of BCR which have potential to become mobile under certain environmental conditions were collectively termed as “potential mobile pool” and compared with E-value. It was concluded that metal extracted by weak acid underestimates the exchangeable fraction while the potential mobile pool extracted by three reagents overestimates the real mobile forms of heavy metals. However, better mobility characteristics of heavy metals can be assessed by coupling information obtained through sequential extraction and isotopic exchange.

scholarly journals The Alternative Method of Conditioning Industrial Wastewater Containing Heavy Metals Based on the Hydrothermodynamic Cavitation Technology

2020 ◽  
pp. 991-1001
Author(s):  
Olga G. Dubrovskaya ◽  
Vladimir A. Kulagin ◽  
Yao Limin
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Mathematical Modelling ◽  
Physicochemical Properties ◽  
Industrial Wastewater ◽  
Heavy Metal Ions ◽  
Industrial Effluent ◽  
Process Equipment ◽  
Optimal Parameters ◽  
Physicochemical Changes

This article provides the results of studies of modifying the physicochemical properties of industrial wastewater when treated in a cavitation reactor. The authors performed an analysis of physicochemical changes in the makeup of industrial effluent and defined the efficiency of reducing the content of heavy metal ions under various modes of hydrothermodynamic action. The article also proposes the methods of mathematical modelling for determining the optimal parameters of cavitation treatment of wastewater and reveals the advantages of upgrading the wastewater process equipment with the inclusion of a unit of SC-reactors

scholarly journals Phytoremediation of Aluminum and Iron from Industrial Wastewater Using Ipomoea aquatica and Centella asiatica

2020 ◽  
Vol 10 (9) ◽  
pp. 3064 ◽  
Author(s):  
Marlia Mohd Hanafiah ◽  
Muhamad F. Zainuddin ◽  
Nurul Umairah Mohd Nizam ◽  
Azhar Abdul Halim ◽  
Akhtar Rasool
Keyword(s):  
Heavy Metals ◽  
Metal Concentration ◽  
Industrial Wastewater ◽  
Translocation Factor ◽  
Centella Asiatica ◽  
Good Relationship ◽  
Ipomoea Aquatica ◽  
Heavy Metals Accumulation ◽  
Low Concentrations

Heavy metals accumulation from industrial wastewater even at low concentrations can cause long term cumulative health effects. To overcome this problem, phytoremediation is an alternative method to treat industrial wastewater. In this study, Ipomoea aquatica and Centella asiatica were used as phytoremediation plants for removing aluminum (Al) and iron (Fe) from industrial wastewater. The results showed that the regression value (R2) for all metal concentrations (mg/L) over treatment day is positive and similar to R2 = 1. This result indicated that the metal concentration exhibits a good relationship for reflecting the decrease in the metal concentration with the proportion of treatment day. It was found that I. aquatica accumulates higher Al and Fe contents than C. asiatica. The translocation factor of both plants was found to be greater than 1, implying that both plants can accumulate and extract heavy metals from industrial wastewater.

scholarly journals Experimental method for the assessment and characterization of hazardous waste for long-term storage

2021 ◽  
Vol 3 (1) ◽  
pp. 19-28
Author(s):  
Gina Alina Catrina ◽  
◽  
Bogdan Stanescu ◽  
Agnes Serbanescu ◽  
Georgiana Cernica ◽  
...  
Keyword(s):  
Redox Potential ◽  
Experimental Method ◽  
Hazardous Waste ◽  
Ph Value ◽  
Ph Values ◽  
Long Term Storage ◽  
Chemical Conditions ◽  
Term Storage

Long-term landfilling of hazardous waste should be a careful choice for any producer or generator of waste, as the behavior of the waste is different due to the physical-chemical conditions or following contact with other hazardous waste. In this study, the research undertaken was aimed at developing an experimental method for the assessment and characterization of hazardous waste for long-term storage. The method consists in the assessment of the behavior of heavy metals from waste, under different leaching conditions. To study various hazardous wastes, fly ash from the incineration of medical waste and slag from aluminum casting were chosen. Contact time, pH and redox potential are important parameters in the leaching process. The solubility of metals increases at pH values between 2 - 5 pH units and decreases at pH values between 6-12 pH units. The highest solubility of metals (As, Cr, Cu, Ni, Pb and Zn) in the tested waste was obtained after 48 hours at pH values between 2 - 5 pH units. Also, the values of the redox potential decrease almost linearly as the pH value increases. The developed method is a useful tool to assess the behavior of hazardous waste for long-term storage in landfills for this category of wastes.

scholarly journals Heavy metals tolerance in bacteria from industrial wastewater

2021 ◽  
Vol 15 (3) ◽  
pp. 307-317
Author(s):  
Ntung Nseabasi-Maina ◽  
Gideon Chijoke Okpokwasili ◽  
Obioma Agwa
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Industrial Wastewater ◽  
Industrial Effluent ◽  
Heavy Metal Resistance ◽  
Metal Resistance ◽  
Health Concern ◽  
Waste Effluents ◽  
Metals Tolerance ◽  
Ph Level

The incidence of chemical stressors in industrial waste effluents has culminated in the re-engineering the genetic and metabolic characteristic of resident microbiota. Microbial adaptability enables them to tolerate these stressors however, propelling the phenomena of acquisition of heavy metal resistance which may also incite resistance to antibiotics. Waste water from industrial establishments may travel from site into surrounding communities via canals and waterways thus, disseminating these stressors as well as resistance in the environment. This study seeks to investigate the physicochemical and heavy metal composition of industrial effluent and its tolerance in resilient bacteria from the study area. Physiochemical analyses revealed pH level which ranged between (5.8-10.87), BOD (6.612-16.01 mg/l), TDS (937.226-2173.49 mg/l), Sulphates (658.72- 1342.28 mg/l), Nitrates (11.46-70.16 mg/l), Phosphate (3.03-8.43 mg/l) exceeded the NESRA limits; Cu (0.024-4.521 mg/l) Cd (0.002-6.41 mg/l), Pb (0.001-8.151mg/l), Zn (0.511-6.092 mg/l). All the isolates showed marked tolerance to Cu, Cr, Pb, Cd and Zn at concentrations between 200 and 500µg/ml, except Alkanindiges sp. 5-0-9 and Bacillus altitudinis which were not susceptible to all the heavy metals at all concentrations. This study revealed the incidence of heavy metal resistance among bacterial isolates from industrial wastewater, the incidence of which could give rise to co-occurrence with antibiotic resistance thus, aggravating a public health concern.

scholarly journals Synthesis and Characterization of Iron Oxide Nanoparticles and Applications in the Removal of Heavy Metals from Industrial Wastewater

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Zuolian Cheng ◽  
Annie Lai Kuan Tan ◽  
Yong Tao ◽  
Dan Shan ◽  
Kok Eng Ting ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Maghemite Nanoparticles ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Solution Ph ◽  
X Ray ◽  
Adsorption Data ◽  
Removal Of Heavy Metals

This study investigated the applicability of maghemite (γ-Fe2O3) nanoparticles for the selective removal of toxic heavy metals from electroplating wastewater. The maghemite nanoparticles of 60 nm were synthesized using a coprecipitation method and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDX). Batch experiments were carried out for the removal of Pb2+ions from aqueous solutions by maghemite nanoparticles. The effects of contact time, initial concentration of Pb2+ions, solution pH, and salinity on the amount of Pb2+removed were investigated. The adsorption process was found to be highly pH dependent, which made the nanoparticles selectively adsorb this metal from wastewater. The adsorption of Pb2+reached equilibrium rapidly within 15 min and the adsorption data were well fitted with the Langmuir isotherm.

scholarly journals INDUSTRIAL REJECTION: REMOVAL OF HEAVY METALS BASED ON CHEMICAL PRECIPITATION AND RESEARCH FOR RECOVERABLE MATERIAL IN BYPRODUCTS

2020 ◽  
Vol 7 (2) ◽  
pp. 39-52
Author(s):  
Jemjami Saloua ◽  
Taoufik Mohamed ◽  
Moufti Ahmed ◽  
Moustaid Khadija
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Rapid Development ◽  
Thermal Analyses ◽  
Calcium Sulphate ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Optimum Ph ◽  
Removal Of Heavy Metals

With the acceleration of urbanization and the rapid development of industry and agriculture, a large number of industrial wastewater containing heavy metal is produced. In this study we worked on industrial rejection. The method for removing heavy metals from industrial wastewater based on chemical precipitation method is proposed in this paper, which utilizes lime (CaO), limestone (CaCO3), and sodium hydroxide (NaOH). Research on gypsum (CaSO4, 2H2O) in byproducts resulted from precipitation is carried out based on thermal analyses, infrared spectra and XRD examinations. The characterization of the effluent showed that’s very hard, rich in sulphate, chlorides, orthophosphate and in heavy metals. The results show that the examined chemical coagulants were all efficient in the removal of the studied metals (Cu, Cd, Fe, Co and Zn). The overall results indicate that the optimum pH for hydroxide precipitation of the studied metals is varied between pH 6.0 and 10.0. Since all effluent guidelines require an effluent pH between 7 and 8, the use of carbonate treatment is, therefore, recommended because its buffering capacity value is around pH 7. The analyzes carried out on the byproducts of treatment (FTIR, XRD, TGA/TDA) show that they are mostly composed of gypsum: calcium sulphate dihydrate (CaSO4·2H2O).

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