قائمة الطعام
The swelling property of granules is advantageous to pack them in a loose bed with appropriate mesh support. The biopolymer (chitosan) used for the granulation was carefully selected, also adsorbs arsenic thus playing synergistic effect with iron oxide for the arsenic removal (Gang et al. 2010; Jiang et al. 2013; Liu et al. 2010). Post ...
Arsenic (As) removal is of major significance because inorganic arsenic is highly toxic to all life forms, is a confirmed carcinogen, and is of significant environmental …
Conventionally applied techniques to remove arsenic species include oxidation, coagulation-flocculation, and membrane techniques. Besides, progress has …
Comparison of Arsenic Removal Sorbents. Source: Chen et al., 2010, Water Research Foundation. The ion exchange (IX) process differs from the AM process in that IX media is meant to be regenerated …
Numerous iron-based materials and processes have been developed to address the issue of arsenic removal from drinking water. ... and Sasai, R. (2010). Arsenate removal from water using Fe3O4-loaded activated carbon prepared from waste biomass. Chemical Engineering Journal 160, 57–62. doi: 10.1016/j.cej.2010.03.003. …
Epub 2010 Jun 18. Author. Wolfgang H Höll 1. Affiliation. 1 [email protected]. PMID: 20559860. DOI: 10.1007/s10653-010-9307-9. Abstract. In this review paper, various …
Arsenic elimination by membrane processes. Membrane processes offer additional possibilities for As-removal. Elimination can be achieved by (1) filtration of As-bearing particles, (2) exclusion because of size of hydrated ions, or (3) electric repulsion by the membrane (see references in EPA 2000 ).
In the present work, the possibility of using a non-conventional finely ground (250 μm) Azadirachta indica (neem) bark powder [AiBP] has been tested as a low-cost biosorbent for the removal of arsenic(III) from water. The removal of As(III) was studied by performing a series of biosorption experiments (batch and column). The biosorption …
Corpus ID: 130395001; SURVEY OF ARSENIC REMOVAL FROM WATER BY COAGULATION AND DISSOLVED AIR FLOATATION METHOD @article{Mostafapour2010SURVEYOA, title={SURVEY OF ARSENIC REMOVAL FROM WATER BY COAGULATION AND DISSOLVED AIR FLOATATION METHOD}, …
This study shows that nanocrystalline iowaite is a promising, low-cost material for arsenic removal from natural arsenic-rich waters or contaminated high-arsenic waters. ... 117–125 (2010).
This publication includes arsenic treatment design criteria for central treatment by oxidation/ filtration, adsorptive media, and anion exchange; and for point-of-use (POU) and point-of-entry (POE) treatment devices. Under certain circumstances, a pilot study may be required prior to detail plan submittal for the arsenic removal treatment system.
Arsenic contamination of groundwater and surface water is widespread throughout the world. Considering its carcinogenicity and toxicity to human and animal health, remediation of arsenic-contaminated water has become a high priority. There are several physicochemical-based conventional technologies available for removing …
3.2. Sorption isotherm of arsenite removal with ferrihydrite in adsorption and coprecipitation. The sorption isotherm of the adsorption process follows the Langmuir-type model shown in Fig. 1 (b). The saturated sorption density of As(III) was ~0.2 (mol-As/mol-Fe), which is the same as that of As(V) [24], and it corresponds to the exchange capacity …
The removal of As(V) increased from 60 to 90% as the arsenic feed water concentration was increased from 10 to 316 mg/L. Compared to As(V), the rejection of the uncharged As(III) species was ...
Arsenic removal by adsorption. Many methods have been given for Arsenic removal which include chemical precipitation [ 25 ], adsorption [ 26 ], ion exchange [ 27 ], reverse osmosis [ 28 ], and electro-dialysis [ 29 ]. Out of all these methods adsorption method found to be cheap and best for the removal of arsenic.
Economic feasibility of nanofiltration membrane for arsenic removal is also discussed. Arsenic contamination in drinking water causes serious environmental and health issues worldwide. More than 230 million people are exposed to arsenic conta. ... (2010) Influence of operating parameters on the arsenic removal by nanofiltration. …
2.4. Scientometric analysis. The scientometric analysis, a method applied to identify the research priority in any field of science, was applied to identify the research needs in As removal from aqueous solution ( Wu et al., 2020 ). Literature was searched using the keywords "Arsenic", "removal" and "water" in the Scopus.
High arsenic (As) in groundwater poses a severe health risk to 100 million people worldwide (Fendorf et al. 2010; Rodriguez-Lado et al. 2013).To provide As-safe drinking water, the groundwater in deep aquifers (>150 m) is suggested as an alternative source (Michael and Voss 2008).However, such large-scale exploitation could facilitate …
The trend of arsenic removal with the change of temperature is not the same for all membranes as the applied pressure, such as increasing by 20 • C in temperature, the arsenate removal decreases ...
The study showed that, apart from pH, the removal of arsenic from contaminated water also depends on contact time and initial concentration of arsenic. Equilibrium was achieved in 3 h in the case of 2 mg/L of As(V) and As(III) concentrations at pH 6.5. ... 21 March 2010. Accepted: 08 November 2010. Published: 07 December 2010. …
In this work the removal of pentavalent arsenic from synthetic water was studied on laboratory scale by using two commercial nanofiltration (NF) spiral-wound membrane modules (N30F by Microdyn-Nadir and NF90 by Dow Chemical). The influence of main operating parameters such as feed concentration, pH, pressure and temperature on the …
Selective removal of arsenic (As) is the key challenge for any of As removal mechanisms as this not only increases the efficiency of removal of the main As species …
Ferrous based red mud sludge (FRS) which combined the iron–arsenic co-precipitation and the high arsenic adsorption features was developed aimed at low arsenic water treatment in rural areas. Arsenic removal studies shown that FRS in dosage of 0.2 or 0.3 g/l can be used effectively to remove arsenic from aqueous solutions when initial …
Presently used arsenic removal technology has been reviewed, pointing especially to the promise of membrane technologies as a practical means of purification. The membrane technologies include reverse osmosis (RO), nanofiltration (NF), ultrafiltration (UF) and microfiltration (MF). Among them, the applications of the first two have proved …
Overall, iron-based adsorbents offer significant potential towards developing adsorbents for arsenic removal from water. The recent developments on iron-based adsorbents such as iron oxyhydroxides nanoparticles, zero-valent iron, bimetallic oxides, and iron oxyhydroxide-doped composite materials are fully discussed in this review. Go …
Tables 8.1 and 8.2 showed the various oxidants for arsenic removal with different parameters and various coagulants utilized for the removal of arsenic from wastewater and groundwater ... Pan B, Qiu H, Nie G, Xiao L, Lu L (2010) Highly efficient removal of heavy metals by polymer-supported nanosized hydrated Fe(III) oxides: …
Arsenic being the twentieth most abundant metalloid in the earth's crust is one of the most hazardous elements both for humans and animals. Arsenic results from both man-made and natural activities pose a major health hazard for around 150 million people across the globe due to its carcinogenic properties. Thus, the review article …
Arsenic removal experiments were performed by the batch equilibrium method at room temperature (25 ± 1 °C) with various initial arsenic concentrations and an adsorbent dose of 0.5 g/L ...
The Socio-economics of Arsenic Removal. Nature Geoscience, 2010, 3(1):2-3. Suzanne Hanchett. Nearly an eighth of the population in Bangladesh relies on arsenic-contaminated drinking water. Arsenic-removal filters could help to reduce exposure, but their price is high for the poor and their maintenance is cumbersome,
Rice (Oryza sativa L.) is particularly susceptible to arsenic (As) accumulation. Currently, to decrease the level of As accumulated in rice, various post-harvest methods, i.e., polishing, parboiling, pH-dependent soaking, washing, and cooking at different rice-to-water ratios (r/w), are being focused, because it removes significant …
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