Residue-free removal of arsenic, iron, manganese and ammonia from groundwater

Rott, Ulrich; Meyer, Carsten; Friedle, M.

doi:10.2166/ws.2002.0003

Cited by 13 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Especially at low to moderate arsenic concentrations, the technology of arsenic adsorption is relatively effective. A new approach to remove arsenic from groundwater is by retention in the subsurface, because during in-situ or subsurface iron removal, arsenic levels are also reduced (Rott and Meyer, 2002;van Halem et al, 2008). At many groundwater treatment plants in Europe, incidental co-precipitation of arsenite and arsenate occurs during iron removal.…”

Section: Arsenic Not a Problem In Europe?mentioning

confidence: 99%

Arsenic in drinking water: a worldwide water quality concern for water supply companies

Halem

Bakker

Amy

et al. 2009

Drink. Water Eng. Sci.

136

View full text Add to dashboard Cite

Abstract. For more than a decade it has been known that shallow tube wells in Bangladesh are frequently contaminated with arsenic concentrations at a level that is harmful to human health. By now it is clear that a disaster of an unheard magnitude is going on: the World Health Organization has estimated that long-term exposure to arsenic in groundwater, at concentrations over 500 µg L −1 , causes death in 1 in 10 adults. Other studies show that problems with arsenic in groundwater/drinking water occur in many more countries worldwide, such as in the USA and China. In Europe the focus on arsenic problems is currently confined to countries with high arsenic levels in their groundwater, such as Serbia, Hungary and Italy. In most other European countries, the naturally occurring arsenic concentrations are mostly lower than the European drinking water standard of 10 µg L −1 . However, from the literature review presented in this paper, it is concluded that at this level health risks cannot be excluded. As consumers in European countries expect the drinking water to be of impeccable quality, it is recommended that water supply companies optimize arsenic removal to a level of <1 µg L −1 , which is technically feasible.

show abstract

Section: Arsenic Not a Problem In Europe?mentioning

confidence: 99%

Arsenic in drinking water: a worldwide water quality concern for water supply companies

Halem

Bakker

Amy

et al. 2009

Drink. Water Eng. Sci.

136

View full text Add to dashboard Cite

show abstract

“…Groundwater arsenic concentrations were not reported in this publication, but the surrounding wells had concentrations exceeding 500 µg l −1 . Arsenic removal during subsurface treatment has also been observed by Rott et al (2002), reducing arsenic concentrations from 38 µg l −1 to below 10 µg l −1 after repeating the process 20 times. Van Halem et al (2010b) found less encouraging results at sites in Bangladesh with 145 µg l −1 arsenic, with immediate arsenic breakthrough upon abstraction (V i = 1 m 3 ).…”

Section: Introductionmentioning

confidence: 91%

Subsurface arsenic removal column tests: from the laboratory to the field

Moed¹,

Halem²,

Verberk³

et al. 2012

Preprint

View full text Add to dashboard Cite

Previous laboratory column experiments have given evidence of competitive effects between different groundwater constituents in the process of subsurface arsenic removal, a process in which arsenic is removed from groundwater by injecting water with oxygen into the subsurface. The presence of phosphate and other anions significantly limited arsenic removal. To investigate the influence of phosphate in natural groundwater, pumping stations in Loosdrecht (the Netherlands) and Subotica (Serbia) both with low phosphate concentrations (<0.1 mg l<sup>−1</sup>) and considerable arsenic concentrations (30 and 110 μg l<sup>−1</sup>) were chosen, to perform experiments identical to the previous laboratory work. Despite of the absence of phosphate, the subsurface arsenic removal process performed poorly in Subotica, with 50% arsenic breakthrough occurring after 2 to 4 column pore volumes of abstracted water. In Loosdrecht subsurface arsenic removal showed more promising results, 50% breakthrough after 6 to 7 pore volumes, while having a lower pH than Subotica and similar silicate concentrations. The water composition of both locations gives reason to suggest that natural organic matter has a limiting effect on subsurface arsenic removal as well. The presented results have shown the complexity of factors influencing subsurface arsenic removal, making it very challenging to select appropriate sites

show abstract

“…In contrast, the in situ arsenic removal is a relatively new venture (Rott et al, 2002;van Halem et al, 2009). Nevertheless, the in situ arsenic removal has potentially been developed as a costeffective method to provide safe drinking water for rural and remote areas.…”

mentioning

confidence: 99%

“…Nevertheless, the in situ arsenic removal has potentially been developed as a costeffective method to provide safe drinking water for rural and remote areas. It has been reported that injecting aerated water into an aquifer reduced the concentration of arsenic from as high as 400 μg/L to the WHO standard (≤ 10 μg/L) (Appelo and de Vet, 2003;Rott et al, 2002). In Bangladesh, Sarkar and Rahman (2001) reported that using this method can lower high concentrations of arsenic (500-1300 μg/L) by more than 50%.…”

mentioning

confidence: 99%

In situ treatment of arsenic contaminated groundwater by aquifer iron coating: Experimental study

Xie

Wang

et al. 2015

Science of The Total Environment

View full text Add to dashboard Cite

In situ arsenic removal from groundwater by an aquifer iron coating method has great potential to be a cost effective and simple groundwater remediation technology, especially in rural and remote areas where groundwater is used as the main water source for drinking. The in situ arsenic removal technology was first optimized by simulating arsenic removal in various quartz sand columns under anoxic conditions. The effectiveness was then evaluated in an actual high-arsenic groundwater environment. The arsenic removal mechanism by the coated iron oxide/hydroxide was investigated under different conditions using scanning electron microscopy (SEM)/X-ray absorption spectroscopy, electron probe microanalysis, and Fourier transformation infrared spectroscopy. Aquifer iron coating method was developed via a 4-step alternating injection of oxidant, iron salt and oxygen-free water. A continuous injection of 5.0 mmol/L FeSO4 and 2.5 mmol/L NaClO for 96 h can form a uniform goethite coating on the surface of quartz sand without causing clogging. At a flow rate of 7.2 mL/min of the injection reagents, arsenic (as Na2HAsO4) and tracer fluorescein sodium to pass through the iron-coated quartz sand column were approximately at 126 and 7 column pore volumes, respectively. The retardation factor of arsenic was 23.0, and the adsorption capacity was 0.11 mol As per mol Fe. In situ arsenic removal from groundwater in an aquifer was achieved by simultaneous injections of As(V) and Fe(II) reagents. Arsenic fixation resulted from a process of adsorption/co-precipitation with fine goethite particles by way of bidentate binuclear complexes. Therefore, the study results indicate that the high arsenic removal efficiency of the in situ aquifer iron coating technology likely resulted from the expanded specific surface area of the small goethite particles, which enhanced arsenic sorption capability and/or from co-precipitation of arsenic on the surface of goethite particles.

show abstract

Residue-free removal of arsenic, iron, manganese and ammonia from groundwater

Cited by 13 publications

References 0 publications

Arsenic in drinking water: a worldwide water quality concern for water supply companies

Arsenic in drinking water: a worldwide water quality concern for water supply companies

Subsurface arsenic removal column tests: from the laboratory to the field

In situ treatment of arsenic contaminated groundwater by aquifer iron coating: Experimental study

Contact Info

Product

Resources

About