Mandal, G.C. and Masto, R.E. (2020) Effective scrap iron particles (SIP) pre-treatment for complete mineralization of benzidine based azo dye effluent. Arabian Journal of Chemistry, 13 (1). pp. 134-145.

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Abstract

This study proposed that hybrid scrap cast iron particles (SIP)-aerobic biodegradation technology could enhance the biodegradability of toxic wastewater. SIP cleaved the azo linkages of Direct Green1 dye to form benzidine, 4-aminophenol, aniline and 1,2,7-triamino-8-hydroxynapthalene-3,6-disulfonic acid. SIP-mediated dye reduction was effective at wide pH range; however, kinetic analysis revealed fastest pseudo-first order dye reduction rate at acidic pH 3 (kd = 0.549 min−1) followed by pH 9 (kd = 0.383 min−1) and pH 7 (kd = 0.318 min−1). The daughter aromatic amines produced were partially adsorbed onto the SIP surface and maximally at neutral pH. The adsorption process followed pseudo-second order adsorption kinetics and Langmuir isotherm. Benzidine was adsorbed more than 4-aminophenol and aniline. BOD5 of the SIP-treated effluent increased from 0.93 to 12 mg/L showing improved biodegradability. The daughter amines were rapidly mineralized in the aerobic bioreactor within 6 h. Cost-effective SIP pre-treatment could accelerate mineralization and detoxification of recalcitrant wastewater.

Item Type:	Article
Uncontrolled Keywords:	Adsorption; Biodegradability; Direct green 1 (DG1); Reduction; Scrap cast iron particles (SIP)
Subjects:	Envieronmental Management Group
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	07 Mar 2020 06:28
Last Modified:	07 Mar 2020 06:28
URI:	http://cimfr.csircentral.net/id/eprint/2156

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