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Bacterial reduction of CR (VI)-containing electroplating wastewater utilizing agricultural wastes

Ahmad, Wan Azlina and Surif, Salmijah and Zakaria, Zainul Akmar (2011) Bacterial reduction of CR (VI)-containing electroplating wastewater utilizing agricultural wastes. In: Bacteria in Environmental Biotechnology: The Malaysian Case Study-Analysis, Waste Utilization and Wastewater Remediation. Nova Science Publishers, Inc., Hauppauge, New York, p. 40559. ISBN 978-1-61728-350-5

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The bacterial reduction of Cr(VI) from industrial wastewater was evaluated using a 2.0-m3 bioreactor. Liquid pineapple waste was used as a nutrient for the biofilm community formed inside the bioreactor. The use of rubber wood sawdust as packing material was able to immobilize more than 106 CFU mL−1 of Acinetobacter haemolyticus cells after 3 days of contact time. Complete reduction of 15–240 mg L−1 of Cr(VI) was achieved even after 3 months of bioreactor operation. Cr(VI) was not detected in the final effluent fraction indicating complete removal of Cr from solution from the flocculation/coagulation step and the unlikely re-oxidation of Cr(III) into Cr(VI). Impatiens balsamina L. and Gomphrena globosa L. showed better growth in the presence of soil–sludge mixture compared to Coleus scutellarioides (L.) Benth. Significant amounts of Cr accumulated at different sections of the plants indicate its potential application in Cr phytoremediation effort. The bacterial-based system was also determined not to be detrimental to human health based on the low levels of Cr detected in the hair and nail samples of the plant operators. Thus, it can be said that bacterial-based Cr(VI) treatment system is a feasible alternative to the conventional system especially for lower Cr(VI) concentrations, where sludge generated can be used as growth supplement for ornamental plant as well as not detrimental to the health of the workers.

Item Type:Book Section
Uncontrolled Keywords:agricultural wastes
Subjects:T Technology > TD Environmental technology. Sanitary engineering
Divisions:Chemical Engineering
ID Code:45330
Deposited By: Haliza Zainal
Deposited On:29 Apr 2015 09:04
Last Modified:10 Aug 2017 04:41

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