Fractionation of Macro and Trace Metals Due to Off-Time Interrupted Electrodewatering

Tuan, Pham-Anh; Sillanpää, Mika

doi:10.1080/07373937.2010.482693

Cited by 18 publications

(3 citation statements)

References 41 publications

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“…For the determination of the cation exchange capacity of soil, ammonium acetate, sodium chloride, formaldehyde, phenolphthalein and sodium hydroxide were used [21]. Exchangeable or macrometal cations were obtained with the ammonium acetate method [22]. While for carbonates, sulfuric acid, phenolphthalein and ethanol were used.…”

Section: Laboratory Testsmentioning

confidence: 99%

Design and Construction of a Prototype for Arsenic Retention in Mining-Contaminated Waters by Application of Nanoparticles-Based Technosols

et al. 2023

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A large number of heavy metals are usually contained in mine-derived liquids, which could cause contamination of surrounding water sources. Due to the detrimental effects on the environment and health, conventional treatments have been employed to capture heavy metals in mining-polluted streams. This study shows the results of the operation of a built prototype for the retention of arsenic contained in waters contaminated by mining activities using Technosols (mixtures of local soil with nanoparticles). Our team previously run laboratory tests using fixed-bed columns to find out the best dose of the Technosol (97% soil + 3% nanoparticles). Based on these results, the sizing and building of a scale model were conducted, which in turn was used to evaluate the performance of the treatment in a concrete channel packed with reactive barriers. Variations in water volume, barrier separation and gate opening were tested to analyze the behavior of the proposed system and to obtain the most optimal hydraulic retention time that allowed the prototype to reach an arsenic retention level of a minimum of 70%. Moreover, to analyze the procedure under conditions of high arsenic contamination, samples of mine tailings were enriched with the toxic metalloid. It was found that the content of Fe in the local soil allowed adsorption of the contaminant, which was subsequently compared with the increase in the uptake of As due to the Fe/FeS multicomponent nanoparticles (NPs), dosed in the Technosol in a proportion of 97% soil + 3% NPs. The best treatment achieved 70.5% of As removal in ten cycles with a volume of 44 L. Tests were run at a maximum input flow rate of 43.8 L·min−1, an output flow rate of 13.2 L·min−1, a speed of 6.0 m·min−1 and a hydraulic retention time of 3.4 min per cycle. Results of arsenic retention using this prototype suggest that this simple and inexpensive technological setup could be scaled up to a functional field application to effectively capture the toxic metalloid.

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Section: Laboratory Testsmentioning

confidence: 99%

Design and Construction of a Prototype for Arsenic Retention in Mining-Contaminated Waters by Application of Nanoparticles-Based Technosols

et al. 2023

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“…Water in sludge can be in the following forms, namely: (1) free water (bulk water) -water not associated with solid particles including void water not associated with capillary forces, (2) intestinal water -water trapped in crevices and interstitial spaces of flocs and microbes, (3) vicinal water -water held to particle surfaces by adsorption and adhesion, for instance by hydrogen bonding and (4) water of hydration -water chemically bound within the particle structure [26]. Although conventional mechanical sludge dewatering methods (centrifuge, filter press, vacuum filter) can only remove free water and an insignificant amount of intestinal water resulting in a high water content sludge [9], they are commonly used in medium and large scale wastewater treatment plants [27] as too in the case of our plant. High water content in sludge is a treatment disadvantage, as the incineration of such residues is consequently uneconomical.…”

Section: Mineralogical Composition Physical and Chemical Properties Of The Sludgementioning

confidence: 99%

“…The mobility of trace metals, their bioavailability and related eco-toxicity to plants depend strongly on their specific chemical forms or ways of binding. Extraction methods provide useful information about the bioavailability and potential mobility as well the eco-toxicity and environmental impacts of heavy metals in sewage sludge [9].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Municipal Sewage Sludge as a Soil Improver and a Fertilizer Product

Pöykiö

Watkins

Dahl

2019

Ecological Chemistry and Engineering S

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In this study, we have determined the main important physical and chemical properties of municipal sewage sludge and compared them to the requirements of the Finnish Fertilizer Product Act and Fertilizer Product Decree in order to assess the potential utilization of this by-product as a fertilizer. Except for Hg (1.4 mg/kg d.m.), the total concentrations of Cd, Cu, Ni, Pb, Zn, Cr and As in our sewage sludge were lower that the Finnish maximum permissible heavy metal concentrations for sewage sludge used as a fertilizer products. However, the sewage sludge may be utilized as a soil improver, a growing media or as a fertilizer product in landfill sites (e.g. surface structures) or in other closed industrial areas, because the above mentioned Finnish limit values are not applied at these sites. If the sewage sludge is to be utilized in these kinds of areas, an environmental permit may be needed. According to BCR-extraction, the lowest release potential (solubility) from the sample matrix was observed for sulphur (58.4 %) and the highest for Cd (100 %).

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Wastewater Reuse and Management

Sharma¹,

Sanghi²

2013

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Fractionation of Macro and Trace Metals Due to Off-Time Interrupted Electrodewatering

Cited by 18 publications

References 41 publications

Design and Construction of a Prototype for Arsenic Retention in Mining-Contaminated Waters by Application of Nanoparticles-Based Technosols

Design and Construction of a Prototype for Arsenic Retention in Mining-Contaminated Waters by Application of Nanoparticles-Based Technosols

Characterisation of Municipal Sewage Sludge as a Soil Improver and a Fertilizer Product

Wastewater Reuse and Management

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