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A comparative treatment of bleaching wastewater by physicochemical processes.
Water Sci Technol. 2017 Nov; 76(9-10):2367-2379.WS

Abstract

The bleaching effluent discharged from a pulp and paper mill contains chlorinated organic compounds which are toxic to living matter. Physicochemical treatments such as coagulation and different advanced oxidation processes (AOPs) were employed for combined bleaching effluent generated from the first two stages (i.e. chlorination and alkali extraction) (pH = 3.5, chemical oxygen demand (COD) = 1,920 mg/L, and total organic carbon (TOC) = 663 mg/L). At optimum conditions (pH = 7.5, polyaluminium chloride (PAC) dose = 3.84 g/L and slow mixing time = 25 min), ∼68% removal in UV254 and ∼23% TOC removal was obtained during coagulation. Among various AOPs, UV/Fe2+/TiO2/H2O2 system showed the highest TOC and COD removals (∼78%) after 2 h duration (Fe2+:H2O2 molar ratio = 1:100). After the AOP process, chloride ion concentration and biodegradability of the treated wastewater was increased to 2,762 mg/L and 0.46 from an initial value of 2,131 mg/L and 0.29, respectively. The wastewater and sludge analysis showed oxidation and adsorption as the major mechanisms for organics removal. Upon reuse of the regenerated catalysts, TOC removal was reduced significantly. It was found that three times more sludge per unit TOC removal was generated after coagulation in comparison to that produced after UV/Fe2+/TiO2/H2O2 treatment.

Authors+Show Affiliations

Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India E-mail: a.garg@iitb.ac.in.Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India E-mail: a.garg@iitb.ac.in.Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India E-mail: a.garg@iitb.ac.in.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

29144295

Citation

Oke, Ninad, et al. "A Comparative Treatment of Bleaching Wastewater By Physicochemical Processes." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 76, no. 9-10, 2017, pp. 2367-2379.
Oke N, Singh S, Garg A. A comparative treatment of bleaching wastewater by physicochemical processes. Water Sci Technol. 2017;76(9-10):2367-2379.
Oke, N., Singh, S., & Garg, A. (2017). A comparative treatment of bleaching wastewater by physicochemical processes. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 76(9-10), 2367-2379. https://doi.org/10.2166/wst.2017.355
Oke N, Singh S, Garg A. A Comparative Treatment of Bleaching Wastewater By Physicochemical Processes. Water Sci Technol. 2017;76(9-10):2367-2379. PubMed PMID: 29144295.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparative treatment of bleaching wastewater by physicochemical processes. AU - Oke,Ninad, AU - Singh,Swati, AU - Garg,Anurag, PY - 2017/11/17/entrez PY - 2017/11/17/pubmed PY - 2018/5/10/medline SP - 2367 EP - 2379 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 76 IS - 9-10 N2 - The bleaching effluent discharged from a pulp and paper mill contains chlorinated organic compounds which are toxic to living matter. Physicochemical treatments such as coagulation and different advanced oxidation processes (AOPs) were employed for combined bleaching effluent generated from the first two stages (i.e. chlorination and alkali extraction) (pH = 3.5, chemical oxygen demand (COD) = 1,920 mg/L, and total organic carbon (TOC) = 663 mg/L). At optimum conditions (pH = 7.5, polyaluminium chloride (PAC) dose = 3.84 g/L and slow mixing time = 25 min), ∼68% removal in UV254 and ∼23% TOC removal was obtained during coagulation. Among various AOPs, UV/Fe2+/TiO2/H2O2 system showed the highest TOC and COD removals (∼78%) after 2 h duration (Fe2+:H2O2 molar ratio = 1:100). After the AOP process, chloride ion concentration and biodegradability of the treated wastewater was increased to 2,762 mg/L and 0.46 from an initial value of 2,131 mg/L and 0.29, respectively. The wastewater and sludge analysis showed oxidation and adsorption as the major mechanisms for organics removal. Upon reuse of the regenerated catalysts, TOC removal was reduced significantly. It was found that three times more sludge per unit TOC removal was generated after coagulation in comparison to that produced after UV/Fe2+/TiO2/H2O2 treatment. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/29144295/A_comparative_treatment_of_bleaching_wastewater_by_physicochemical_processes_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2017.355 DB - PRIME DP - Unbound Medicine ER -