heavy metals removal Articles
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Heavy Metal Removal in a compact design
One of Wastech’s most popular standard products is the CWT-75. The CWT-75 is designed to treat small batches of rinse water – up to 500 gpd - with dissolved heavy metals of various concentrations and complexity. The system features a compact footprint, an ergonomical design with safety in mind, and ease of operation to deliver the same functionality of a large batch system at a ...
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Project - WTP Metakor
Process: Toveko sand filter Flow: 6 m3/h SS out: less than 10 mg/l Application: heavy metals removal ...
By KAMPS s.a.
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Heavy metals removal from aqueous solutions by using Ficus religiosa leaves ash: equilibrium and kinetics study
In this study, sorption of lead (II) and chromium (VI) by Ficus religiosa leaves ash (FRLA) was investigated. Batch experiments were performed to study the effects of pH, sorbent dose, temperature and initial metal concentrations. The maximum sorption capacity of lead (II) and chromium (VI) was found to be 68.03 and 38.02 mg g–1, respectively. The optimum pH of 2 and 4 was obtained for chromium ...
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Heavy metal removal - Case Study
KDF 55 and 85 Provide Non-Chemical Water Treatment Media for Lead Removal and Other Heavy Metal Removal from Water In New Jersey's mercury contaminated groundwater - KDF media have been removing mercury to levels below the MCL since 1992. Redox media, non-chemical water treatment remove up to 98% of water-soluble cations (positively-charged ions) of lead, mercury, copper, nickel, chromium, and ...
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Innovative use of silvichemical biomass and its derivatives for heavy metal sorption from wastewater
Biosorption is a process of metabolism-independent, passive, physico-chemical binding of metal ions involving non-living biomass, which offers advantages over conventional methods because of cost-effectiveness, especially for dilute metal solutions, and minimal environmental impact. This paper reviews heavy metal biosorption using silvichemical-based biomass materials. It discusses the use of a ...
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Heavy metal removal from wastewater using various adsorbents: a review
Heavy metals are discharged into water from various industries. They can be toxic or carcinogenic in nature and can cause severe problems for humans and aquatic ecosystems. Thus, the removal of heavy metals from wastewater is a serious problem. The adsorption process is widely used for the removal of heavy metals from wastewater because of its low cost, availability and eco-friendly nature. ...
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Biosorption of Cu(II) and Zn(II) ions from aqueous solution by water hyacinth (Eichhornia crassipes)
The biosorption of Cu(II) and Zn(II) ions from aqueous solution by raw water hyacinth (RWH) and acid treated water hyacinth (TWH) was studied as a function of time, biosorbent dosage and pH. The kinetic results obeyed well the pseudo second–order model. Maximum biosorption capacities for RWH and TWH were measured as 0.49, 6.56 mg/g for Cu(II) and 2.66, 10.71 mg/g for Zn(II), respectively. FT–IR ...
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Heavy metals removal from water by adsorption on propylthiol-functionalised mesoporous silica obtained by co-condensation
Propylthiol-functionalised mesoporous silica SBA-15 prepared by co-condensation has been tested for heavy metal removal. Adsorption from aqueous solution was examined for Cu(II), Pb(II), Cd(II), and Hg(II). Adsorption isotherms were determined at 20°C and Langmuir and Freundlich models were fitted to experimental data. The results from adsorption experiments indicate that mercury is efficiently ...
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Lead removal efficiency using biosorbents as alternative materials for permeable reactive barriers
As alternative materials for heavy metal removal, this study investigated biosorbents to determine their suitability for permeable reactive barriers. The lead removal efficiencies of brown seaweed (Undaria pinnatifida) and reed (Phragmites australis) were determined under different conditions (batch and column system). The experimental results for these biomaterials fitted the Langmuir isotherm ...
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Mechanisms of heavy metal removal using microorganisms as biosorbent
Release and distribution of heavy metals through industrial wastewaters has adverse affects on the environment via contamination of surface- and ground-water resources. Biosorption of heavy metals from aqueous solutions has been proved to be very promising, offering significant advantages such as low cost, availability, profitability, ease of operation, and high efficiency, especially when ...
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Treatment of heavy metals by iron oxide coated and natural gravel media in Sustainable urban Drainage Systems
Sustainable urban Drainage Systems (SuDS) filter drains are simple, low-cost systems utilized as a first defence to treat road runoff by employing biogeochemical processes to reduce pollutants. However, the mechanisms involved in pollution attenuation are poorly understood. This work aims to develop a better understanding of these mechanisms to facilitate improved SuDS design. Since heavy ...
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Optimisation of cell surface and structural components for improving adsorption capacity of Pseudomonas putida 5-x to Cu2+
A heavy metal binding bacterium Pseudomonas putida 5-x was used as biosorbent for heavy metal removal from wastewater. In order to compete with physical adsorbent, the optimisation of the cell preparation technique for further improving its biosorption capacity was conducted. Results showed that the compositions of medium for cell culturing, cell growth age and cell pre-treating technique would ...
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Preparation and characterization of nanoporous resin for heavy metal removal from aqueous solution
New nanoporous resin (NPR), based on organic xerogel compounds, was prepared at 150 °C by sol–gel method from pyrogallol and formaldehyde mixtures in water using perchloric acid as catalyst. NPR was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and nitrogen porosimetry. The metal uptake characteristics were explored using ...
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Comparison of removal of chromium (III) from aqueous solution by two kinds of modified diatomite: manganese-oxide-modified diatomite and microemulsion-modified diatomite
Crude Diatomites Modified by Microemulsion (DMM) and manganese oxide (MnD) are tested for the removal of chromium (III) in this study. The results indicate that zero point of charge (pHZPC) of DMM is 4.7 and that of MnD is 4.6. Both DMM and MnD show remarkable increase in the sorption capacity of chromium (III) when compared with untreated diatomite, and the removal of chromium (III) by DMM is ...
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Removal of Cu(II) from aqueous solutions by living and non–living cultured sludges: equilibrium modelling
In this study, the removal of Cu(II) from aqueous solutions using living and non–living cultured sludges of different sludge ages was investigated. For non–living sludge, only the metabolism–independent bio–adsorption process occurred and Langmuir model was adequate to describe the adsorption isotherm. When living sludge was used as the adsorbent, a proposed model incorporating the bio–adsorption ...
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EPS production and bioremoval of heavy metals by mixed and pure bacterial cultures isolated from Ankara Stream
This study is focused on isolation of Ni(II), Cu(II) and Cr(VI) resistant bacteria to assess their exopolysaccharide (EPS) production and related bioremoval capacities. Mixed cultures had higher heavy metal removal capacity in media with molasses (MAS) than the control cultures lacking this carbon (AS) containing 50 mg/l of heavy metal. The yields were 32%, 75.7%, and 51.1% in MAS, while the ...
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Adsorptive removal studies of lead(II) ions using functionalized silica
An adsorbent was prepared by the functionalization of 2-hydroxyacetophenone-3-thiosemicarbazone onto 3-aminopropyl silica by diazotation and characterized by Fourier transmission infra red spectrometry. The functionalized silica was evaluated for removal of lead(II) ions in aqueous solutions. The maximum adsorption capacity 385 μg/g was obtained with an initial concentration of 1,000 μg/L by the ...
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Removal of cadmium(II) ions from aqueous solution using Ni (15 wt.%)-doped
α -Fe2O3 nanocrystals: equilibrium, thermodynamic, and kinetic studiesThe present publication investigates the performance of nanocrystalline Ni (15 wt.%)-doped α-Fe2O3 as an effective nanomaterial for the removal of Cd(II) ions from aqueous solutions. The nanocrystalline Ni-doped α-Fe2O3 powders were prepared by mechanical alloying, and characterized by X-ray diffraction and a vibrating sample magnetometer. Batch-mode experiments were ...
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Lead, copper, cobalt and nickel removal from water solutions by dynamic ionic exchange in LECA zeolite beds
LECA zeolite, a novel material containing zeolite crystallised on light expanded clay aggregates (LECA) substrates with the aid of a hydrothermal process, was used in ionic exchange applications. LECA zeolite combines the porosity, low density and good mechanical properties of LECA substrates with the microporosity and ion-exchange properties of zeolites. In the present work, the dynamic ionic ...
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Rapid removal of heavy metal ions from aqueous solutions by low cost adsorbents
In the present investigation, different agricultural solid wastes namely: eggplant hull (EH), almond green hull (AGH), and walnut shell (WS), that are introduced as low cost adsorbents, were used for the removal of heavy metals (cobalt, strontium and mercury ions) from aqueous solutions. Activation process and/or chemical treatments using H2O2 and NH3 were performed on these raw materials to ...
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