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Combined oxidative and biological treatment of separated streams of tannery wastewater.
Water Sci Technol. 2004; 49(4):287-92.WS

Abstract

Leather tanning effluents are a source of severe environmental impacts. In particular, the unhairing stage, belonging to the beamhouse processes, generates an alkaline wastewater with high concentrations of organic matter, sulphides, suspended solids, and salts, which shows significant toxicity. The objective of this work was to evaluate the biodegradation of this industrial wastewater by combined oxidative and biological treatments. An advanced oxidation process (AOP) with Fenton's reagent was used as batch pretreatment. The relationships of H2O2/Fe2+ and H2O2/COD were 9 and 4, respectively, reaching an organic matter removal of about 90%. Subsequently, the oxidised beamhouse effluent was fed to an activated sludge system, at increasing organic load rates (OLR), in the range of 0.4 to 1.6 g COD/L x day. The biological organic matter removal of the pre-treated wastewater ranged between 35% and 60% for COD, and from 60% to 70% for BOD. Therefore, sequential AOP pretreatment and biological aerobic treatment increased the overall COD removal up to 96%, compared to 60% without pretreatment. Bioassays with D. magna and D. pulex showed that this kind of treatment achieves only a partial toxicity removal of the tannery effluent.

Authors+Show Affiliations

Environmental Science Center EULA-Chile, University of Concepción, P.O. Box 160-C, Concepción, Chile. glvidal@udec.clNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15077985

Citation

Vidal, G, et al. "Combined Oxidative and Biological Treatment of Separated Streams of Tannery Wastewater." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 49, no. 4, 2004, pp. 287-92.
Vidal G, Nieto J, Mansilla HD, et al. Combined oxidative and biological treatment of separated streams of tannery wastewater. Water Sci Technol. 2004;49(4):287-92.
Vidal, G., Nieto, J., Mansilla, H. D., & Bornhardt, C. (2004). Combined oxidative and biological treatment of separated streams of tannery wastewater. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 49(4), 287-92.
Vidal G, et al. Combined Oxidative and Biological Treatment of Separated Streams of Tannery Wastewater. Water Sci Technol. 2004;49(4):287-92. PubMed PMID: 15077985.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Combined oxidative and biological treatment of separated streams of tannery wastewater. AU - Vidal,G, AU - Nieto,J, AU - Mansilla,H D, AU - Bornhardt,C, PY - 2004/4/14/pubmed PY - 2004/7/28/medline PY - 2004/4/14/entrez SP - 287 EP - 92 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 49 IS - 4 N2 - Leather tanning effluents are a source of severe environmental impacts. In particular, the unhairing stage, belonging to the beamhouse processes, generates an alkaline wastewater with high concentrations of organic matter, sulphides, suspended solids, and salts, which shows significant toxicity. The objective of this work was to evaluate the biodegradation of this industrial wastewater by combined oxidative and biological treatments. An advanced oxidation process (AOP) with Fenton's reagent was used as batch pretreatment. The relationships of H2O2/Fe2+ and H2O2/COD were 9 and 4, respectively, reaching an organic matter removal of about 90%. Subsequently, the oxidised beamhouse effluent was fed to an activated sludge system, at increasing organic load rates (OLR), in the range of 0.4 to 1.6 g COD/L x day. The biological organic matter removal of the pre-treated wastewater ranged between 35% and 60% for COD, and from 60% to 70% for BOD. Therefore, sequential AOP pretreatment and biological aerobic treatment increased the overall COD removal up to 96%, compared to 60% without pretreatment. Bioassays with D. magna and D. pulex showed that this kind of treatment achieves only a partial toxicity removal of the tannery effluent. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/15077985/Combined_oxidative_and_biological_treatment_of_separated_streams_of_tannery_wastewater_ DB - PRIME DP - Unbound Medicine ER -