Management of arsenic-accumulated waste from constructed wetland treatment of mountain tap-water

Nakwanit, Sannop; Visoottiviseth, Pornsawan; Khokiattiwong, Somkiat; Sangchoom, Wantana

doi:10.1016/j.jhazmat.2010.10.017

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…However, there has been limited research relating these properties with leaching behavior. Previous studies have compared leaching using the TCLP, with a final pH above 5, and have found slightly decreased leaching with increased curing time, from 14 to 28 days, and very little change between leaching from samples cured 28 days and samples cured longer than 1 year [15,[53][54][55]. In this study, we found little difference in curing conditions on arsenic leaching at a final pH 3.8-4.0 (Figure 3).…”

Section: Short-term Leaching Tests With Varying Phsupporting

confidence: 47%

Evaluating the cement stabilization of arsenic-bearing iron wastes from drinking water treatment

Clancy

Snyder

Reddy

et al. 2015

Journal of Hazardous Materials

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Cement stabilization of arsenic-bearing wastes is recommended to limit arsenic release from wastes following disposal. Such stabilization has been demonstrated to reduce the arsenic concentration in the Toxicity Characteristic Leaching Procedure (TCLP), which regulates landfill disposal of arsenic waste. However, few studies have evaluated leaching from actual wastes under conditions similar to ultimate disposal environments. In this study, land disposal in areas where flooding is likely was simulated to test arsenic release from cement stabilized arsenic-bearing iron oxide wastes. After 406 days submersed in chemically simulated rainwater, <0.4% of total arsenic was leached, which was comparable to the amount leached during the TCLP (<0.3%). Short-term (18 h) modified TCLP tests (pH 3-12) found that cement stabilization lowered arsenic leaching at high pH, but increased leaching at pH<4.2 compared to non-stabilized wastes. Presenting the first characterization of cement stabilized waste using μXRF, these results revealed the majority of arsenic in cement stabilized waste remained associated with iron. This distribution of arsenic differed from previous observations of calcium-arsenic solid phases when arsenic salts were stabilized with cement, illustrating that the initial waste form influences the stabilized form. Overall, cement stabilization is effective for arsenic-bearing wastes when acidic conditions can be avoided.

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Section: Short-term Leaching Tests With Varying Phsupporting

confidence: 47%

Evaluating the cement stabilization of arsenic-bearing iron wastes from drinking water treatment

Clancy

Snyder

Reddy

et al. 2015

Journal of Hazardous Materials

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“…Our results further showed the removal efficiencies of Mn, Fe, Pb and Zn as 88%, 85.71, 98% and 3.90%, respectively. These removal efficiencies are in line with those of previous studies [34][35][36][37][38][39][40] . Meanwhile, efficient removal of heavy metals from wastewater has been attributed to the added rhizobacterium and adsorbents used in the CW systems [38,39] .…”

Section: Heavy Metalssupporting

confidence: 92%

Performance of Common Reed (Phragmites australis) in a Constructed Wetland for Greywater Treatment in Akure, Nigeria

Alatise

Olanrewaju

et al. 2021

NJAS

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Shortage of freshwater is becoming a growing problem in both dry and semi-dry regions of the world, hence the need to make use of other source of water for agricultural production. The study was conducted to examine the performance of common reed in a constructed wetland for greywater treatment in Akure, Nigeria. Raw greywater was collected from Jadesola Hostel, Federal University of Technology, Akure, and pretreated through a combination of gravel of diameters < 32 mm, 24 mm and 16 mm with fine sand of diameter 0.2 mm arranged accordingly. The filtered water was thereafter released to a plastic constructed wetland (CW) which also consisted of same combination of layers of gravel and sand with common reed planted on it for complete treatment. The raw and treated greywater were analyzed for Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Dissolved Solid (TDS), and heavy metals. It was discovered that CW planted with common reed was effective in the treatment of greywater with reduction in BOD by 91.4%, COD by 91.5% and TDS by 38.7%. CW had appreciable removal effect on heavy metals with reduction in: manganese (Mn) from 0.100 ppm to 0.012 ppm, iron (Fe) from 0.014 ppm to 0.002 ppm, lead (Pb) from 0.05 ppm to 0.001 ppm and zinc (Zn) from 0.154 ppm to 0.148 ppm. Therefore, the use of common reed in constructed wetland for greywater treatment is recommended for farmers involved in irrigation with greywater, especially during dry seasons, and most importantly under the rising global water scarcity due to climate change.

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“…Entre os componentes tóxicos encontrados nesses resíduos, destacam-se o arsênio (As), o cromo (Cr), o cádmio (Cd), entre outros, e por essa razão, não devem ser destinados sem o devido controle, à medida que possuem potencial de serem lixiviados, liberando metais pesados para o meio ambiente (SULLIVAN et al, 2010;JUNKES et al, 2012;BRAGA;VEIGA, 2012;ARUKWE;EGGEN;MÖDER, 2012;SHARMA et al, 2014). Nesse sentido, vários trabalhos destacam os efeitos adversos desses elementos na saúde humana, bem como nos sistemas ambientais (NAKWANIT et al, 2011;COUSSY et al, 2012;TOUJAGUEZ et al, 2013;AGRAFIOTI;KALDERIS;DIAMADOPOULOS, 2014).…”

Section: Introductionunclassified

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

Barros

Dantas

Neves

et al. 2020

Eng. Sanit. Ambient.

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RESUMO Este trabalho objetivou imobilizar metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas em substituição total ao agregado natural. Dois tipos de resíduos foram utilizados: os resíduos de fragmentação das aparas (QS) e os do pó de serragem (QP). Os resíduos foram caracterizados por fluorescência de raios X, difração de raios X e ensaios de toxidade conforme metodologia da Norma Brasileira (NBR) 10005, da NBR 10006 e do Toxicity Characteristic Leaching Procedure (TCLP) 1311. Então, foram analisadas composições de argamassas contendo cimento, cal e os resíduos (QS, QP) utilizando-se a técnica de delineamento de mistura, determinando os melhores traços, o melhor tipo de cura (imersa ou úmida) e, posteriormente, avaliando a resistência dos corpos de prova após cura. A caracterização do resíduo de quartzito revelou a presença de vários metais pesados e extratos lixiviados em contato com a água, classificando-o como resíduo de Classe I — Perigoso. Os resultados indicam que as composições determinadas foram capazes de imobilizar os metais pesados presentes nos resíduos de quartzitos, bem como resultou em argamassas com resistências mecânicas superiores a 2 MPa. Por fim, mostrou-se que essa técnica de solubilização e estabilização dos contaminantes presentes nos resíduos de quartzito é uma alternativa tecnologicamente viável e ambientalmente adequada para a destinação final desses resíduos.

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Management of arsenic-accumulated waste from constructed wetland treatment of mountain tap-water

Cited by 12 publications

References 16 publications

Evaluating the cement stabilization of arsenic-bearing iron wastes from drinking water treatment

Evaluating the cement stabilization of arsenic-bearing iron wastes from drinking water treatment

Performance of Common Reed (Phragmites australis) in a Constructed Wetland for Greywater Treatment in Akure, Nigeria

Imobilização de metais pesados presentes nos resíduos de quartzito por meio da incorporação em argamassas com substituição total do agregado natural

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