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Reducing the levels of Cr (VI) in wastewaters and provide alternative sources. •. Cr − uptake, translocation, and toxicity on plant and human were discussed. …
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Download: Download high-res image (187KB) Download: Download full-size image Engineering extracellular electron transfer to promote simultaneous brewing wastewater treatment and chromium reduction. A highly electroactive Shewanella algae-L3 was firstly screened from activated sludge.Subsequently, to facilitate the EET rate of …
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A number of factors have been identified to influence chromium toxicity on activated sludge, such as, pH, biomass concentration, presence of organic substances or other heavy metals, acclimation process, exposure time, etc. Naturally, the presence of chromium species in wastewaters may affect the performance of wastewater …
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The present study investigated the performance of a chromium-based advanced oxidation process using chromium (as Cr3+ or Cr6+) and H2O2 for the treatment of synthetic and simulated textile wastewaters. With the Cr3+/H2O2 system, the maximum total organic carbon (TOC) and color removals from the synthetic dye …
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Chromium (Cr) is widely used in industry such as electroplating, leather tanning, and metallurgy 1,2.During these industrial activities, Cr is inevitably released into groundwater and surface ...
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By improving the reusability of nanomaterial and process efficiency, current treatment approaches can be boosted and treatment process can be reduced. This …
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Chromium (VI) in Wastewater: History and Remedies for the Large Scale Treatment ... Treatment of tannery wastewater has been a challenge due to its complex organic pollutants orginated from ...
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These results suggest that the PU@nZVI nanocomposite is a highly efficient and sustainable option for chromium(VI) removal in water treatment applications. Scientific Reports - Hexavalent chromium ...
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Introduction Copper and chromium are two of the most common metals found in wastewater discharge of petrochemical plants and also prevalent in run-off wastewater discharge from other industrial sites [1]. The effluent from these industries contains hexavalent chromium, Cr(VI), at concentrations ranging from tenths to …
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Contamination of water resources by industrial effluents containing heavy metal ions and management of solid waste from agricultural and food industries is a serious issue. This study presents the ...
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In Egypt, the tannery wastewater is discharged directly to the main domestic sewage pipeline which adds difficulties to the sewer system and to the wastewater treatment plants. Chromium has been ...
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The world's water supplies have been contaminated due to large effluents containing toxic pollutants such as dyes, heavy metals, surfactants, personal care products, pesticides, and pharmaceuticals from agricultural, industrial, and municipal resources into water streams. Water contamination and its treatment have emerged out as an …
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This study presents a feasible strategy for Cr(VI) detoxification and synchronous on-site H 2 O 2 generation, providing a new perspective for innovative …
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The wastewater treatment techniques currently employed treat hexavalent chromium-containing effluent streams with low-cost industrial byproducts. Emphasis is …
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Various types of waste such as vegetable waste, alum sludge and dome slag, can be considered for growth media. So far, mineralized waste (aged municipal waste), water treatment residues (by-products of water treatment systems) and fly ash (solid coal power plants waste) have been used as wetland bedding media (Bavandpour …
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Biological treatment of chromium-containing wastewater has great potential due to its economy, efficiency and safety (Pradhan et al. 2017). In the late 1970s, Romanenko & Koren'Kov (1977) isolated a genus (Pseudomonas) that can reduce Cr(VI) under anaerobic conditions. This was the first report of microbial reduction of Cr(VI).
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The results suggest that BSFL can serve as a sustainable and economically viable biological treatment for hazardous waste such as COPR, offering potential benefits for both the environment and the economy. Further research is needed to explore the mechanisms and effects of BSFL on hazardous waste treatment.
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Hence the MgO was found to be a good precipitating agent for removal and recovery of chromium from tanning wastewater. The basic chromium sulfate (BCS) recovered at pH 2.8 is suitable for tanning ...
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Water pollution by recalcitrant compounds is an increasingly important problem due to the continuous introduction of new chemicals into the environment. Choosing appropriate measures and developing successful strategies for eliminating hazardous wastewater contaminants from industrial processes is currently a primary …
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Electro-coagulation, utilizing low-cost iron plate electrodes, was explored for factual tannery wastewater treatment in this manuscript.
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The demand for innovative waste treatment techniques has arisen because of the establishment and operation of rigorous waste discharge guidelines into the environment. ... (Cd), chromium (Cr), nickel (Ni), and lead (Pb) are present in freshwater reservoirs. Due to its carcinogenic and teratogenic activities, heavy metals offer serious …
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Wastewater from electroplating facilities and certain types of chemical plants contains toxic forms of hexavalent chromium such as chromate and dichromate. The hexavalent chromium in this wastewater must be reduced before the water can be discharged. This requires a two-step process: hexavalent chromium (CR6) is reduced to trivalent …
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Through the isotherm analysis of Cr(VI) adsorption, the high degree of fitting with a model can help us to preliminarily understand the removal mechanism of Cr(VI), help us to have a macro understanding of Cr(VI) adsorption, and to provide a good idea in enhancing material properties and solving the actual chromium wastewater treatment.
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Water scarcity is one of the major problems in the world and millions of people have no access to freshwater. Untreated wastewater is widely used for agriculture in many countries. This is one of the world-leading serious environmental and public health concerns. Instead of using untreated wastewater, treated wastewater has been found …
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Hexavalent chromium [Cr(VI)] is considered one of the most carcinogenic and mutagenic toxins among numerous heavy metals and metalloids that are commonly found in various industrial waste streams ...
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Secondly, as noted above, chromium is a toxic heavy metal. Therefore, in the treatment of chromium complex wastewater using biotechnology, chromium in the wastewater may be toxic to the microorganisms, resulting in reduced efficacy or treatment failure (Zhao et al., 2005). On the other hand, chromium in wastewater would be …
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Heavy metals such as barium, beryllium, cadmium, mercury, lead, chromium, arsenic, copper, selenium, antimony and thallium all cause toxicity in water depending on their concentration [3], [4].The National Primary Drinking Water Regulations of United States Environmental Protection Agency for heavy metals are given in Table …
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inhibition levels for trivalent chromium and hexavalent chromium were included in the local limits calculations. However, the inhibition concentration levels for these pollutants were the same or higher than total chromium. The calculated protection criteria for trivalent chromium was 10 mg/L and 1.0 mg/L for hexavalent chromium.
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This treatment adds to the already high cost of wastewater treatment and places an extra burden on treatment facilities. ... zinc, chromium, oil and grease and suspended solids below discharge. In …
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chromium with precipitation to chromium hydroxide a harmless, non-toxic substance. Chrome Waste Treatment Process Chromate waste rinse water is typically treated in 2 stages. Stage 1 changes hexavalent chromium (Cr+6) to trivalent chromium (Cr+3). Trivalent chromium freely bonds to hydroxide in Stage 2 of the treatment process.
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