Removal of hexavalent Chromium-Industry treated water and Wastewater: A review

Polyelectrolytes as a Material of Value in Water Treatment: A Review

Asian Journal of Water Environment and Pollution ◽

10.3233/ajw210035 ◽

2021 ◽

Vol 18 (3) ◽

pp. 109-115

Author(s):

Shagufta Jabin ◽

Priti Gupta ◽

Mukta Sharma

Keyword(s):

Water Treatment ◽

Industrial Wastewater ◽

Aquatic Animals ◽

Treated Water ◽

Optimum Dosage ◽

Water And Wastewater ◽

Removal Of Contaminants ◽

Different Origins

The use of polyelectrolytes in the treatment of water/wastewater has been studied with special emphasis on the characteristic impurities, which should be removed and the types of polyelectrolytes commonly available. Much attention is being on using polyelectrolyte as primary coagulation, their application as a coagulant aid, including the use of dual polyelectrolytes in the treatment of complex industrial wastewater. The optimum dosage of polyelectrolytes in all kinds of water and wastewater is very low when they are used as coagulant aids in conjunction with inorganic polyelectrolytes. Hence, the quantification of remaining polyelectrolytes in the water after their treatment is ruled out in this case. Polymer toxicity in aquatic animals has been assessed and the presence of residual polyelectrolytes in the treated water has been discussed. Keeping in view the applicability of these polyelectrolytes for the removal of contaminants, it is expected that this technique can be applied for further investigation in various types of water from different origins.

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Cr(VI) Femoval from Ground Waters by Ferrous Iron Redox-Assisted Coagulation in a Continuous Treatment Unit Comprising a Plug Flow Pipe Reactor and Downflow Sand Filtration

Applied Sciences ◽

10.3390/app10030802 ◽

2020 ◽

Vol 10 (3) ◽

pp. 802 ◽

Cited By ~ 3

Author(s):

Ioannis A. Katsoyiannis ◽

Maria Xanthopoulou ◽

Anastasios I. Zouboulis

Keyword(s):

Drinking Water ◽

Hexavalent Chromium ◽

Ferrous Iron ◽

Ph Value ◽

Iron Concentration ◽

Plug Flow ◽

Linear Velocity ◽

Continuous Treatment ◽

Treatment Unit ◽

Treated Water

Chromium(VI) (Cr(VI)) is the main chromium species found in groundwater and is considered as a highly toxic and carcinogenic element to humans. In the present study, removal of Cr(VI) by coagulation with ferrous iron is studied in a continuous flow treatment unit comprising pipe flocculation reactors followed by a sand filter. The studied parameters, regarding their effect on the removal of hexavalent chromium, were the ferrous iron dose, the effect of linear velocity, and the effect of the starting Cr(VI) concentration. The experiments have shown that the Cr(VI) removal achieved was very efficient and residual Cr(VI) and total Cr concentration in the treated water was lower than 10 μg/L, provided that the required dose of ferrous iron is provided. In particular, the study demonstrated that the removal of hexavalent chromium, from initial concentration of 50 μg/L and 100 μg/L, was more than 90% with ferrous doses of 1 mg/L and 2 mg/L respectively, applying linear velocity of 8 m/h, at an initial pH value of 7.3. Iron concentration in treated water was very low, far below 200 μg/L, which is the limit for iron in drinking water. This unit comprises a simple treatment option, for applications at the household level, with minimum maintenance requirements capable of removing Cr(VI) to concentrations below 10 μg/L, which might be the future limit for chromium in drinking water.

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Removal of Hexavalent Chromium-Contaminated Water and Wastewater: A Review

Water Air & Soil Pollution ◽

10.1007/s11270-008-9893-7 ◽

2008 ◽

Vol 200 (1-4) ◽

pp. 59-77 ◽

Cited By ~ 488

Author(s):

Mojdeh Owlad ◽

Mohamed Kheireddine Aroua ◽

Wan Ashri Wan Daud ◽

Saeid Baroutian

Keyword(s):

Hexavalent Chromium ◽

Contaminated Water ◽

Water And Wastewater

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Polypyrrole-polyaniline copolymer coated green rice husk ash as effective adsorbent for the removal of hexavalent chromium from contaminated water

Materials Advances ◽

10.1039/d0ma00862a ◽

2021 ◽

Author(s):

Soumi Dutta ◽

Suneel Kumar Srivastava ◽

Ashok Kumar Gupta

Keyword(s):

Acute Toxicity ◽

Human Health ◽

Hexavalent Chromium ◽

Rice Husk ◽

Rice Husk Ash ◽

Contaminated Water ◽

Water And Wastewater

The acute toxicity and mobility of hexavalent chromium (Cr(VI)) in water and wastewater possess a severe risk to the environment and human health. In view of this, the present work...

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