Manuscript belongs to the Forum  Reusing sludge from surface water treatment plant for hexavalent chromium adsorption in aqueous solution

Nguyen Duc Dat Duc; Le Minh Thanh; Nguyen Tan Phong

doi:10.15625/2525-2518/16463

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Authors

Nguyen Duc Dat Duc Ho Chi Minh City University of Food Industry, 140 Le Trong Tan, Tay Thanh, Tan Phu Distct, Ho Chi Minh city, Viet Nam
Le Minh Thanh Ho Chi Minh City University of Food Industry, 140 Le Trong Tan, Tay Thanh, Tan Phu Distct, Ho Chi Minh city, Viet Nam
Nguyen Tan Phong Ho Chi Minh City University of Food Industry, 140 Le Trong Tan, Tay Thanh, Tan Phu Distct, Ho Chi Minh city, Viet Nam https://orcid.org/0000-0003-1716-7117

DOI:

https://doi.org/10.15625/2525-2518/16463

Keywords:

adsorption, hexavalent chromium, plating wastewater, surface water treatment sludge

Abstract

Contaminants in plating wastewater are hard to remove, especially hexavalent chromium ions. This waste stream contains a large amount of Cr⁶⁺, a highly toxic metal, potential to cause cancer. To reduce this pollution, sludge from a supply water treatment plant (DWTS) has been used to make adsorbent. This sludge was denaturized by thermal method. After that, a plating synthetic waste stream contained Cr⁶⁺ was treated by a batch adsorption model with adsorbent made from DWTS. pH, amount of adsorbent, and treatment time were investigated to determine the suitable treatment conditions. The study was also evaluated the suitability of two adsorption models Langmuir and Freundlich. Results showed that, under the conditions of pH = 6.0, the adsorbent content of 25.0 g/l, after 90.0 minutes, Cr⁶⁺ content remained 0.14 mg/l, close to QCVN 40:2011/BTNMT, column B. The parameters of the Langmuir and Freundlich adsorption equations are: q_max = 12.578 mg/g; K_ads = 0.747 l/mg; n = 0.338; k_f= 5.138. The Freundlich isothermal model is better fitted to the chromium adsorption process than Langmuir isothermal model.

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