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What are the main method currently used for Arsenic removal from waste water?

Coprecipitation

Human decontamination

Freundlich equation

Electrocoagulation

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The main methods currently used for arsenic removal from wastewater include adsorption, coprecipitation, electrocoagulation, and membrane processes. Adsorption techniques, such as using iron-coated pomelo peel or steel slag as adsorbents, have shown high arsenic removal efficiencies . Coprecipitation methods involving mixed metal systems like MgFe or CaFe have demonstrated significant arsenic removal efficiencies, especially when combined with biopolymers like alginate or chitosan . Electrocoagulation, coupled with supported liquid membranes, has been effective in selectively separating arsenic from drinking water and reducing its concentration below 10 ppb . Membrane processes, along with ion exchanges and emerging nanotechnology-based adsorbents, are also gaining attention for their efficiency in removing arsenic impurities from water sources . These methods offer diverse and effective approaches to combat arsenic contamination in wastewater.

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Open access•Journal Article•DOI Removal of Arsenic From Water With Low Cost and Environmentally-benign Adsorbents Seda Tözüm Akgül, S. Sule Kaplan Bekaroglu - Show less +1 more 01 Sep 2022-Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi 1 Citations	Main methods for arsenic removal from wastewater include adsorption using low-cost, environmentally-benign adsorbents like pumice, red mud, and steel slag, achieving 50-95% removal efficiency with batch tests.
Journal Article•DOI Hybrid technique for removal of arsenic from drinking water Soumi Sarkar, Soumendu Hazra, Kaushik Chakraborty, Ananya Nayak, Prabirkumar Saha - Show less +4 more 25 Oct 2022-Chemical Engineering & Technology	Hybrid technique combining supported liquid membrane and electrocoagulation is utilized for efficient removal of arsenic from drinking water, achieving concentrations below 10 ppb and producing a valuable iron-arsenic precipitate.
Open access•Dissertation•DOI Removal of arsenic from wastewater using mixed metal hydroxides and biopolymers Wei Wu 03 Apr 2023	Main methods for arsenic removal from wastewater include coprecipitation using mixed metal hydroxides (e.g., FeCl3, AlCl3 with MgCl2, CaCl2) and enhancing with biopolymers (alginate, chitosan) for improved efficiency.
Open access•Proceedings Article•DOI Removal Of Arsenic From Water Using Iron-Coated Pomelo Peel (ICPP) 21 Nov 2022	Iron-coated pomelo peel (ICPP) is a highly effective method for arsenic removal from water, surpassing raw pomelo peel, granular activated carbon, and various iron-based adsorbents.
Open access•Journal Article•DOI A review on different arsenic removal techniques used for decontamination of drinking water Howlader Rahidul Hassan 19 Jan 2023-Environmental pollutants & bioavailability 6 Citations	Main methods for arsenic removal from drinking water include ion exchanges, adsorption, membrane processes, electrokinetic processes, electrocoagulation, precipitation, phytoremediation, and nanotechnology-based techniques like nanoparticles and nano adsorbents.

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How batch adsorption takes place for the removal of arsenic from waste water?5 answersBatch adsorption for arsenic removal from wastewater involves utilizing various adsorbents like iron-coated pomelo peel (ICPP), steel slag, pumice, and red mud. These adsorbents exhibit high arsenic removal efficiencies ranging from 50% to 95%. The adsorption process is influenced by factors such as initial pH, contact time, and initial arsenic concentration. Adsorption isotherm models like Langmuir, Freundlich, and modified Freundlich are used to understand the arsenic adsorption behavior. The kinetics of arsenic adsorption follow models like the Elovich model, pseudo-first order, and pseudo-second order kinetic models. Additionally, desorption studies using solutions like 0.1 M NaOH can efficiently recover arsenic from adsorbents like granular ferric oxide (GFO). Overall, batch adsorption processes offer a promising method for arsenic removal from wastewater using various low-cost and effective adsorbents.

How is water treated for arsenic in Arizona?5 answersWater in Arizona contaminated with arsenic is treated using various methods. One approach involves utilizing a combination of cactus mucilage and ferric salt as a flocculation-coagulation system to remove arsenic, achieving 75-96% removal in 30 minutes. Another method includes precipitating arsenic in wastewater under specific conditions using ultrasonic waves, hydrogen peroxide as an oxidant, and an iron salt as a precipitating agent. Additionally, a treatment method involves mixing reaction with hydrogen peroxide, ferric iron source compound, calcium oxide, and diatomite, followed by coagulation and adsorption for arsenic removal. Furthermore, a method employing a titanium dioxide photocatalyst for solid-liquid separation and photocatalytic activity is used, where trivalent arsenic is oxidized by light irradiation and then separated by sedimentation. These diverse techniques contribute to addressing arsenic contamination in Arizona's water sources.

What are the methods for removing arsenic from groundwater?5 answersThere are several methods for removing arsenic from groundwater. One method is electrosorption using materials derived from agricultural wastes, which has shown potential as a novel and environmentally friendly remediation method. Another effective method is the use of nanomaterials, particularly nano zerovalent iron (nZVI), which has been proven to be efficient for arsenic removal through adsorption. Additionally, γ-Fe2O3 nanoparticles have been found to have high arsenic removal potential through electrostatic interactions. Electrocoagulation is another method that has been successful in removing arsenic from groundwater, with high removal efficiencies achieved using different electrode combinations. Finally, iron electrocoagulation has been shown to be an efficient method for arsenic removal, with removal efficiencies exceeding 99.9% in some cases.

What are the most effective water waste treatment methods?4 answersThe most effective water waste treatment methods include coagulation and flocculation using natural coagulants as an alternative to synthetic coagulants. Other methods include activated carbon adsorption, chemical oxidation, and biological treatment. Additionally, constructed wetlands can be used for the purification of wastewater, providing a natural and low-cost solution. For specific types of water waste, such as water-based cutting waste liquid, a method involving mixing specific chemicals and carrying out gas floating treatment, electrolytic treatment, adsorption treatment, and disinfection treatment has been developed. In the paper-making industry, a method involving the addition of wet strength agents, filter aids, and retention aids, as well as the use of multi-disc filtering machines and membrane filtration, has been found to be effective in reducing impurities and reusing the water.

What are the current trends in the removal of arsenic from drinking water by adsorption?5 answersCurrent trends in the removal of arsenic from drinking water by adsorption include the use of natural adsorbents and modified natural materials. These adsorbents are derived from natural materials and offer a cost-effective alternative to traditional methods such as reverse osmosis and ion exchange. Parameters such as contact time, adsorbent dosage, flow rate, pH, reusability, temperature, and the influence of other ions are important factors that can affect the effectiveness of arsenic removal using natural adsorbents. Nanotechnology, specifically the use of graphene nanostructures supported with manganese oxides, has also been studied for the combined removal of arsenic and fluoride from drinking water. The presence of arsenic enhances fluoride removal, and the presence of fluoride enhances arsenic removal, particularly at a neutral pH value. These developments in adsorption technologies provide promising solutions for the efficient removal of arsenic from drinking water.

Which AAS technique is the most sensitive for the analysis of Arsenic in water?4 answersAnodic stripping voltammetry (ASV) using noble electrodes is the most sensitive AAS technique for the analysis of Arsenic in water. ASV can detect As(III) at low ppb levels, which is below the World Health Organization guideline value of 10 ppb. ASV is based on the reduction of As3+ to As0, followed by its stripping or oxidation to As3+ or As5+ species. Electrode surface modification with metallic nanoparticles, carbonaceous nanomaterials, and enzymes can improve detection sensitivity and selectivity. Despite the need for further development in electrode materials and analytical procedures, ASV remains a rapid and convenient method for detecting arsenic in water.

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