Anaerobic treatment of tannery wastewater: toxic effects of wastewater constituents and dosage of ferric chloride

Abstract

Investigates anaerobic two‐stage treatment of tannery wastewater. This results in a mean chemical oxygen demand (COD) removal of 60 per cent for tannery B and more than 70 per cent for tanneries A and C with COD_o = 5,710mg l^‐1 and mean detention time held at 3.5 days. Gas production was small, rating an estimated 75 l kg‐1 COD_o with COD_o = 5,710mg l^‐1. Tests simultaneously the influence of quality and quantity of wastewater on COD removal and gas production (multiple regression). Finds significant inhibitory effects were caused by chloride on gas volume and by sulphate on COD removal. Chromium showed no significant effect. Dosage of ferric chloride for removal of the toxic sulphide effected a decrease in gas volume and had no effect on COD removal (analysis of variance).

Citation

Genschow, E., Hegemann, W. and Maschke, C. (1997), "Anaerobic treatment of tannery wastewater: toxic effects of wastewater constituents and dosage of ferric chloride", Environmental Management and Health, Vol. 8 No. 1, pp. 28-38. https://doi.org/10.1108/09566169710159177