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Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes.
Water Res. 2009 Sep; 43(17):4347-55.WR

Abstract

Electrochemical oxidation is a promising technology to treatment of bio-refractory wastewater. Coking wastewater contains high concentration of refractory and toxic compounds and the water quality usually cannot meet the discharge standards after conventional biological treatment processes. This paper initially investigated the electrochemical oxidation using boron-doped diamond (BDD) anode for advanced treatment of coking wastewater. Under the experimental conditions (current density 20-60mAcm(-2), pH 3-11, and temperature 20-60 degrees C) using BDD anode, complete mineralization of organic pollutants was almost achieved, and surplus ammonia-nitrogen (NH(3)-N) was further removed thoroughly when pH was not adjusted or at alkaline value. Moreover, the TOC and NH(3)-N removal rates in BDD anode cell were much greater than those in other common anode systems such as SnO(2) and PbO(2) anodes cells. Given the same target to meet the National Discharge Standard of China, the energy consumption of 64kWhkgCOD(-1) observed in BDD anode system was only about 60% as much as those observed in SnO(2) and PbO(2) anode systems. Further investigation revealed that, in BDD anode cell, organic pollutants were mainly degraded by reaction with free hydroxyl radicals and electrogenerated oxidants (S(2)O(8)(2-), H(2)O(2), and other oxidants) played a less important role, while direct electrochemical oxidation and indirect electrochemical oxidation mediated by active chlorine can be negligible. These results showed great potential of BDD anode system in engineering application as a final treatment of coking wastewater.

Authors+Show Affiliations

Department of Environmental Engineering, Peking University, the Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.No affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

19595422

Citation

Zhu, Xiuping, et al. "Advanced Treatment of Biologically Pretreated Coking Wastewater By Electrochemical Oxidation Using Boron-doped Diamond Electrodes." Water Research, vol. 43, no. 17, 2009, pp. 4347-55.
Zhu X, Ni J, Lai P. Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes. Water Res. 2009;43(17):4347-55.
Zhu, X., Ni, J., & Lai, P. (2009). Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes. Water Research, 43(17), 4347-55. https://doi.org/10.1016/j.watres.2009.06.030
Zhu X, Ni J, Lai P. Advanced Treatment of Biologically Pretreated Coking Wastewater By Electrochemical Oxidation Using Boron-doped Diamond Electrodes. Water Res. 2009;43(17):4347-55. PubMed PMID: 19595422.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes. AU - Zhu,Xiuping, AU - Ni,Jinren, AU - Lai,Peng, Y1 - 2009/06/23/ PY - 2009/04/08/received PY - 2009/06/14/revised PY - 2009/06/16/accepted PY - 2009/7/15/entrez PY - 2009/7/15/pubmed PY - 2009/11/17/medline SP - 4347 EP - 55 JF - Water research JO - Water Res. VL - 43 IS - 17 N2 - Electrochemical oxidation is a promising technology to treatment of bio-refractory wastewater. Coking wastewater contains high concentration of refractory and toxic compounds and the water quality usually cannot meet the discharge standards after conventional biological treatment processes. This paper initially investigated the electrochemical oxidation using boron-doped diamond (BDD) anode for advanced treatment of coking wastewater. Under the experimental conditions (current density 20-60mAcm(-2), pH 3-11, and temperature 20-60 degrees C) using BDD anode, complete mineralization of organic pollutants was almost achieved, and surplus ammonia-nitrogen (NH(3)-N) was further removed thoroughly when pH was not adjusted or at alkaline value. Moreover, the TOC and NH(3)-N removal rates in BDD anode cell were much greater than those in other common anode systems such as SnO(2) and PbO(2) anodes cells. Given the same target to meet the National Discharge Standard of China, the energy consumption of 64kWhkgCOD(-1) observed in BDD anode system was only about 60% as much as those observed in SnO(2) and PbO(2) anode systems. Further investigation revealed that, in BDD anode cell, organic pollutants were mainly degraded by reaction with free hydroxyl radicals and electrogenerated oxidants (S(2)O(8)(2-), H(2)O(2), and other oxidants) played a less important role, while direct electrochemical oxidation and indirect electrochemical oxidation mediated by active chlorine can be negligible. These results showed great potential of BDD anode system in engineering application as a final treatment of coking wastewater. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/19595422/Advanced_treatment_of_biologically_pretreated_coking_wastewater_by_electrochemical_oxidation_using_boron_doped_diamond_electrodes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(09)00411-4 DB - PRIME DP - Unbound Medicine ER -