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Title of Journal: J Cent South Univ

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Abbravation: Journal of Central South University

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Central South University

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DOI

10.1007/bf02407784

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2227-5223

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Advanced treatment of biologically pretreated coki

Authors: Luting Pan Yue Han Jinfeng Wu
Publish Date: 2015/10/18
Volume: 22, Issue: 10, Pages: 3781-3787
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Abstract

Experiments were conducted to investigate the behavior of the sequential system of intensified zerovalent iron process IZVI and anaerobic filter and biological aerated filter AF/BAF reactors for advanced treatment of biologically pretreated coking wastewater Particular attention was paid to the performance of the integrated system for the removal of chemical oxygen demand COD ammonia nitrogen NH3N and total nitrogen TN The average removal efficiencies of COD NH3N and TN were 7628 9676 and 5997 with the average effluent mass concentrations of 56 053 and 1883 mg/L respectively reaching the first grade of the national discharge standard Moreover the results of gas chromatography/mass spectrum GC/MS and gel permeation chromatography GPC analysis demonstrated that the refractory organic compounds with high relative molecular mass were partly removed in IZVI process by the function of oxidationreduction flocculation and adsorption which could also enhance the biodegradability of the system effluent The removal efficiencies of NH3N and TN were achieved mainly in the subsequent AF/BAF reactors by nitrification and denitrification Overall the results obtained show that the application of IZVI in combination with AF/BAF is a promising technology for advanced treatment of biologically pretreated coking wastewater

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