Arsenite Removal from Drinking Water using Naturally available Laterite in Sri Lanka

Ranasinghe, Rasn; Werellagama, D. R. I. B.; Weerasooriya, Rohan

doi:10.4038/engineer.v47i2.6865

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…19 In Sri Lanka naturally obtainable laterite was used as an effective adsorbent for removing arsenic from contaminated water. 21 The dominant form of arsenic in water is arsenate which can also be removed by using laterite as adsorption material. 22 In a study, operational conditions were accessed for evaluating the natural efficiency of laterite to remove As(V) from groundwater after determining the adsorption capacity through the Langmuir isotherm model, which was 0.565 mg g -1 .…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

“…Role of pH in arsenic removal efficiency of laterite was studied and showed that at pH 10 more than 90 % arsenite removed and less than 10 µg L -1 concentration can be maintained within 5 minutes by keeping arsenite and laterite ratio less than 10 (mg g -1 ). 21 Electrical conductivity indicates the amount of dissolved ionic constituents in water. Non-significant variation occurred in the EC of Filter 1 was observed O n L i n e F i r s t throughout the experiment and it remained in the range of 2 µS/cm to 2.8 µS/cm whereas in case of the Filter 2 the EC was reduced significantly from 10 µs/cm to 5 µs/cm and then remained below 4 µs/cm throughout the experiment.…”

Section: Filter Test and Water Quality Parametersmentioning

confidence: 99%

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Evaluation of laterite as filter media to remove arsenic from groundwater

et al. 2021

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Arsenic (As) in drinking water has a chronic effect on humans and thus is a global health issue. Mostly people of Pakistan use groundwater for drinking, consequently prone to As toxicity. The objective of this study was to evaluate laterite as an adsorbent media for As removal, and subsequent preparation of a low-cost As filter. Laterite was tested for As adsorption capacity through batch sorption experiment and fitting Langmuir model. Two identical filters were prepared using a variable particle size of laterite and substrate material ratios (sand, activated carbon, and brick chips). Arsenic contaminated water was poured daily and collected at the bottom for analysis. The water samples were analyzed for As using an atomic absorption spectrophotometer coupled with hydride generation assembly. Other water quality parameters viz., electrical conductivity (EC), pH, chloride (Cl), total suspended solids (TSS), total dissolved salts (TDS), nitrate (NO-3), calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), carbonate (CO-3), bicarbonate (HCO-3), and sulfate (SO-4) were also tested. Filter1 had an As removal efficiency of about 83 to 93 % while Filter 2 had about 67 to 85 %. Most of the water quality parameters remained under the WHO recommended limits indicating no harmful addition to the filtered water by substrates. It appears that laterite may serve as an economical option for As removal from contaminated groundwater.

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Section: O N L I N E F I R S Tmentioning

confidence: 99%

Section: Filter Test and Water Quality Parametersmentioning

confidence: 99%

Evaluation of laterite as filter media to remove arsenic from groundwater

et al. 2021

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“…Before describing the findings of the present study, a concise summary of selected important results from a previous study on the same soil samples (Ratnayake et al, submitted), is briefly summarized in this paragraph. The soil is lateritic, and lateritic soils are acidic in nature 29 , acidic soils being defined as having pH less than 5.5 for most of the year 30 . Concerning this work, the sampled soils are reddish clayey rock material, with a surface area between 20 – 30 m 2 g -1 and an average soil pH of 4.4 ± 0.2 (i.e., extremely acidic 31 ).…”

Section: Introductionmentioning

confidence: 99%

Combined X-ray absorption and SEM–EDX spectroscopic analysis for the speciation of thorium in soil

Ratnayake

Lützenkirchen

Finck

et al. 2023

Sci Rep

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Mobility and bioavailability of radionuclides in the environment strongly depend on their aqueous speciation, adsorption behavior and the solubility of relevant solid phases. In the present context, we focus on naturally occurring Th-232 at a location in central Sri Lanka presenting high background radiation levels. Four different soil samples were characterized using X-ray Absorption Spectroscopy (XAS) at the Th L3-edge (16.3 keV), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) spectroscopy. X-ray Absorption Near Edge Structure (XANES) spectra are applied as a fingerprint indication for Th existing in different chemical environments. Linear combination fitting (LCF) of the Extended X-ray Absorption Fine Structure (EXAFS) data involving reference Th-monazite (phosphate) and thorianite (oxide) compounds suggested that Th is mostly present as Th-phosphate (76 ± 2%) and Th-oxide (24 ± 2%), even though minor amounts of thorite (silicate) were also detected by SEM–EDX. Further studies on selected individual particles using micro-focus X-ray Fluorescence (μ-XRF) and micro-X-ray Absorption Spectroscopy (μ-XAS) along with SEM–EDX elemental mapping provided information about the nature of Th-bearing mineral particles regarding mixed phases. This is the first study providing quantitative and XAS based speciation information on Th-mineral phases in soil samples from Sri Lanka.

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“…This makes laterite a good adsorbent. Other than that, the high porosity and the availability of anion exchange sites are beneficial for the use of laterite as an adsorbent 17,18 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of Kaolin-rich Laterite Soil for Applications for the Development of Soil-based Cosmetic Products

Dissanayake

Pupulewatte

Jayawardana

et al. 2022

J. Drug Delivery Ther.

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The present study aims to characterize the properties of the raw and thermally activated laterite soil to be used to develop cosmetic products. Collected soil samples were washed and air-dried for 48 hours, collected soil samples were air-dried for 48 hours. Air-dried soil was crushed to create 500 µm powdered materials. Thermally activated soil samples were prepared by heating the laterite soil at 100 0C, 200 0C, 300 0C, and 400 0C for 3 hours in a muffle furnace. The physicochemical properties of laterite such as morphology, surface functional groups, elemental composition, surface area, and trace elements were analyzed. The Cell Forming Unit (CFU) was counted in the raw soil, and thermally activated soil samples at the beginning. Antimicrobial Assay was tested with Candida albicans, Pseudomonas aeruginosa, Staphylococcus aureus microorganisms in raw and thermally activated laterite soil. An uncountable amount of microorganisms per gram was observed in the raw soil sample and fewer microorganisms were counted in 100 0C, and 200 0C samples. The CFU was zero microorganisms per gram for the 300 0C, and 400 0C samples. The optimum density of the culture is measured to estimate the growth of the microbial cells. Oil absorption, sweat absorption and swelling capacity were used to characterize the samples with raw and thermally activated soils. The characterization results indicated that chosen soil samples have good oil and sweat absorption, good swelling capacity and microbiological safety, making them suitable for cosmetic applications. Keywords: Cosmetics, Chemical analysis, Laterite soil, Microbiology, Thermally activation, physiochemical features

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Arsenite Removal from Drinking Water using Naturally available Laterite in Sri Lanka

Cited by 6 publications

References 15 publications

Evaluation of laterite as filter media to remove arsenic from groundwater

Evaluation of laterite as filter media to remove arsenic from groundwater

Combined X-ray absorption and SEM–EDX spectroscopic analysis for the speciation of thorium in soil

Characterization of Kaolin-rich Laterite Soil for Applications for the Development of Soil-based Cosmetic Products

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