Bioremediation of arsenic from water with citric acid cross-linked water hyacinth (E. crassipes) root powder

Abstract

A green and novel approach was demonstrated for successful remediation of arsenic from contaminated water by citric acid (CA) cross-linked water hyacinth root powder (RP). Different analytical techniques were used to investigate the binding and structural properties of prepared materials. Titanium dioxide played a significant role in the cross-linking process. Incorporation of CA into RP enhanced its integrity, and thus removal efficiency remained unaffected after several cyclic runs. Also the turbidity which formed due to treatment with uncross-linked RP was reduced to below the permissible limit. Effect of the amount of CA, material dose, treatment time, initial ion concentration, and pH were investigated. Use of 10% (w/w) CA was found to be sufficient to bring down the turbidity of the treated water below 2.5 nephelometric turbidity unit (NTU) without hampering the removal capacity/rate. A material dose of 5 g/L removed successfully total inorganic arsenic concentration to below 10 μg/L. The sorption process could be reasonably explained by Langmuir isotherm, and the maximum adsorption capacity was found to be 28 μg of arsenic/g. The material was found to be more efficient at acidic pH (pH = 6.72). The sorption process was governed by a pseudo-second-order kinetic model.

Rice Flour and Bran Enriched with Blueberry Polyphenols Increases Storage Stability and Decreases Arsenic Content in Bran

“…Another unique aspect of the pomace extract used in this study was the addition of citric acid to the water for the extraction of polyphenols from pomace. Research has shown that citric acid can be a useful complexing agent (with Fe (II) present) in the removal of arsenic from water [38,39]; however, further testing is warranted to examine the ability of citric acid to aid in the removal of arsenic from rice bran (with and without added pomace polyphenols). Additionally, both the i-As content of rice bran after the addition of blueberry pomace extract (0.295 ppm) and the total As content (0.445 ppm) were still above the 0.200 ppm maximum level in polished rice recommended in 2014 by the Codex Alimentarious Commision’s Committee on Contaminants in Foods [40].…”

Future perspectives and mitigation strategies towards groundwater arsenic contamination in West Bengal, India

“…To remove arsenic from pumped groundwater, the ATUs follow chemical principles of ion exchange and membrane‐based processes (Dominguez‐Ramos et al., 2014; USEPA, 2003), oxidation (Bajpai & Chaudhuri, 1999; Katsoyiannis et al., 2008), coagulation (Jekel & Seith, 2000; Kobya et al., 2020; Kumar et al., 2004; Pokhrel et al., 2005), adsorption (Kango & Kumar, 2016; Lunge et al., 2014; Nikolaidis et al., 2003; Uddin & Jeong, 2020), etc., followed by filtration. Few advanced methods consist of phytoremediation (Kubiak et al., 2012) and bioremediation (Dadwal & Mishra, 2017; Gogoi et al., 2017; Katsoyiannis & Zouboulis, 2004; Kumari et al., 2019; Maity et al., 2021; Rahman et al., 2014; Tsai et al., 2009) of the arsenic‐contaminated water. The water treatment media in these units comprise minerals of iron and aluminum for their high sorption and co‐precipitation affinity towards arsenic (Abass et al., 2016; Bora et al., 2016; Guzmán et al., 2016; Habuda‐Stanić & Nujić, 2015; Kobya et al., 2020; Ordonez et al., 2020).…”

Review: Economic impacts of the invasive species water hyacinth (Eichhornia crassipes): Case study of Rawapening Lake, Central Java, Indonesia

“…It has been shown, for example, that water hyacinth is a good biosorbent for heavy metals contamination and it can improve the quality of water around the plant cover (Wang et al 2012;Moyo et al 2013;Ammar et al 2014;Wanyonyi et al 2014;Matindi et al2014;Pusphe et al 2016;Feng et al 2017;Arenas et al 2018;Ting et al 2018;Sayago 2019). The remediated water that is not polluted by heavy metals can be used for various uses, for example for agricultural irrigation, so that in can increase economic income (Akinwade et al 2013;Matindi et al 2014;Canazart et al 2017;Gogoi et al 2017;Priya et al 2018;Nash et al 2019).…”