Chelant-Assisted Depollution of Metal-Contaminated Fe-Coated Sands and Subsequent Recovery of the Chemicals Using Solid-Phase Extraction Systems

Rahman, Ismail M.M.; Begum, Zinnat A.; Sawai, Hikaru; Ogino, Masashi; Furusho, Yoshiaki; Mizutani, Satoshi; Hasegawa, Hiroshi

doi:10.1007/s11270-015-2312-y

Cited by 14 publications

(2 citation statements)

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“…In general, acidic condition is beneficial for heavy metals removal and the removal efficiency significantly decreased with the increasing pH. In other words, the heavy metals are easy to depose and became difficult to be removed when the condition in alkaline by regulating the metals chelant stability constants, ion-exchange, the sorption or desorption reactions a nd the aqueous metals fractions [28]. However, an overly acidic or alkaline condition is not good for the subsequent processing of sludge.…”

Section: Effect Of Phmentioning

confidence: 99%

Optimizing Heavy Metals Removal of Excess Sludge by Biodegradable Chelants GLDA Using a Response Surface Methodological Approach

Xu¹,

Hong²,

Qiao-Feng³

et al. 2018

Pol. J. Environ. Stud.

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High heavy metals content is the major drawback of sludge resource, especially for sludge derived from an industrial wastewater treatment plant. A novel and more environmentally friendly kind of chelating agent, GLDA, was employed to treat sludge contaminated by heavy metals in the present study. The effects of the GLDA concentration, pH, and reaction time on sludge heavy metals availability and removal were investigated, and the response surface methodology (RSM) based on the Box-Behnken design was employed to optimize these parameters. The results showed that the higher GLDA concentration and the lower pH led to the higher removal rate of heavy metals, but the effect of longer reaction time is not obvious. The optimum conditions of extraction reaction at a GLDA concentration of 0.05 mol•L -1 , pH of 3.56, and reaction time of 2.05 h, under the optimum conditions that the comprehensive heavy metals removal rate was 76.40%, and the extraction efficiencies of Cd, Cu, Pb, and Ni can reach 81.04%, 77.35%, 67.75%, and 75.78%, respectively. Analyzing the response surface plots and contour plots indicated that the effect of pH was more significant than GLDA concentration and reaction time. Scan electron microscope (SEM) observation demonstrated that the flocculent structure of sludge was replaced obviously by mass structure and the layered structure after treatment. Meanwhile, adsorption ability and volume were reduced. The research results also showed that the GLDA treatment sludge can effectively reduce sludge heavy metals content and improve chemical stability, which is advantageous to the sludge dewatering and its further processing and utilization.

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Section: Effect Of Phmentioning

confidence: 99%

Optimizing Heavy Metals Removal of Excess Sludge by Biodegradable Chelants GLDA Using a Response Surface Methodological Approach

Xu¹,

Hong²,

Qiao-Feng³

et al. 2018

Pol. J. Environ. Stud.

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“…Hence, the extraction yield of metals was found to be dependent on the Although there are differences in the rate of metal extraction with EDTA, EDDS and HIDS, the differences are not significant except under highly acidic and strongly basic conditions. In spite of the higher efficiency of EDTA, its poor photo-, chemo-and biodegradability evoke environmental concerns [34][35][36][37], and the biodegradable alternatives (EDDS or HIDS) deserve consideration [38][39][40]. The extraction of Pb and Zn from solids with EDDS was observed to be Chemical Engineering Journal, 277: 219-228, 2015 The original publication is available at: http://dx.doi.org/10.1016/j.cej.2015.04.112 11 superior to extraction with HIDS under basic conditions [40], and EDDS has been selected for subsequent studies.…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Selective recovery of indium from lead-smelting dust

Sawai

Rahman

Tsukagoshi

et al. 2015

Chemical Engineering Journal

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Non-ferrous smelting dust, especially lead-smelting dust (LSD), contains percent levels of indium and thus constitutes a novel indium resource. The main difficulty in recovering indium from LSD is the coexisting presence of lead and zinc. In this study, a unique indium separation process was designed, combining techniques that involve washing with a chelant, leaching with acid and precipitation as hydroxide. The majority of the Pb in the LSD was selectively separated during chelant-assisted washing with ethylenediaminedisuccinate (EDDS), while the residual Pb was diminished through an acid leaching treatment with a mixed solution of sulfuric acid and hydrochloric acid. The chelant washing step also ensures a decrease in the raw LSD weight at a ratio of approximately 82 % due to the removal of lead and counterions such as sulfate, and the washing step also minimizes the consumption of corrosive acids in the subsequent step. Selective indium separation from LSD is further complicated by the similarity of the behavior of zinc during the acid leaching step. Therefore, hydroxide precipitation at pH 5 has been introduced as the final step, ensuring the maintenance of zinc as a soluble species in the supernatant and the selective separation of indium (∼ 88 %) as a hydroxide precipitate. KeywordsIndium recovery; Selective separation; Lead-smelting dust; Chelant-assisted washing; Acid leaching, Hydroxide precipitation Chemical Engineering Journal, 277: 219-228, 2015 The original publication is available at: http://dx.doi. org/10.1016/j.cej.2015.04.112 3 IntroductionThe metal indium, particularly as ITO (indium-tin-oxide) thin film, is an industrially important component because ITO is necessary for building electronic devices [1]. ITO is widely utilized for manufacturing liquid crystal displays, plasma displays and solar energy cells [2], which consume approximately two-thirds of the global indium production [1]. One of the resource materials for raw indium is non-ferrous metal ore [3], which is obtained as a by-product of the smelting process of the non-ferrous metal ore [4]. Raw indium deposits are region-specific (i.e., China, Korea, and Russia) [5]. Discrepancies in demand, supply and price are therefore observed. The search for alternate sources of raw indium is vital from the point of view of resource strategy, and this search is focused mostly on the processing of indium-laden waste materials, e.g., ITO scrap [2, 6-8], end-of-life liquid crystal displays [6,[9][10][11] and etching waste [12][13][14].The residue and flue dust from the smelting of non-ferrous metals, such as lead, termed lead smelting dust or LSD hereafter, also includes indium [15] and is expected to be a novel indium resource. Acid leaching is commonly employed for metal smelting from waste resources [16][17][18].Indium recovery from waste material has been reported through the use of acid leaching and hydroxide or sulfide precipitation [2,6,7,[19][20][21]. This approach is frequently criticized both in terms of overall efficiency d...

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Mechanism and Optimization of Polyepoxysuccinic Acid in Washing Cd-, Pb-, and Zn-Contaminated Soils

Zhong

Zhang

et al. 2021

Water Air Soil Pollut

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Chelant-Assisted Depollution of Metal-Contaminated Fe-Coated Sands and Subsequent Recovery of the Chemicals Using Solid-Phase Extraction Systems

Cited by 14 publications

References 48 publications

Optimizing Heavy Metals Removal of Excess Sludge by Biodegradable Chelants GLDA Using a Response Surface Methodological Approach

Optimizing Heavy Metals Removal of Excess Sludge by Biodegradable Chelants GLDA Using a Response Surface Methodological Approach

Selective recovery of indium from lead-smelting dust

Mechanism and Optimization of Polyepoxysuccinic Acid in Washing Cd-, Pb-, and Zn-Contaminated Soils

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