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
Author affiliations


  • 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



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


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: qmax = 12.578 mg/g; Kads = 0.747 l/mg; n = 0.338; kf = 5.138. The Freundlich isothermal model is better fitted to the chromium adsorption process than Langmuir isothermal model.


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How to Cite

N. D. D. Duc, L. M. Thanh, and N. T. Phong, “Manuscript belongs to the Forum Reusing sludge from surface water treatment plant for hexavalent chromium adsorption in aqueous solution”, Vietnam J. Sci. Technol., vol. 60, no. 6, pp. 1098–1110, Dec. 2022.