Indexed by:期刊论文

Date of Publication:2013-12-01

Journal:Journal of Environmental Chemical Engineering

Included Journals:EI、Scopus

Volume:1

Issue:4

Page Number:899-905

ISSN No.:22133437

Abstract:In this paper, a pre-denitrification biofilm process was conducted to investigate the degradation of Lurgi coal gasification wastewater (CGW). Under the HRT of 72 h and recycle ratio (R) of 2, 80% of COD and 48.9% of NH 4 +N could be removed in AOAO system. In order to improve the pollutants removal efficiency, the order of aerobic reactor (O1) and anaerobic tank (A2) was reversed to build the A2O 2 system. It was found that A2O2 had a better pollutant removal at the same operation conditions, the maximum removal rates of COD and NH4 +N were 94.4% and 90.7%, respectively. Recycle ratio (R) had negligible effect on COD removal, but could strongly affect nitrification efficiency in A2O2. The NH4 +N removal rate increased from about 75% at R was 1-90.72% at R was 2, but decreased to 80.31% at R was 3. Batch test results shown that the bio-degradability of nitrogenous heterocyclic compounds (pyridine, pyrrole and imidazole) could be improved as carbon source for denitrification under the condition of cosubstrate (phenol was used in this test) was introduced. Therefore, the results illustrated that the pre-denitrification biofilm process of A2O2 could treat the CGW effectively. ? 2013 Elsevier Ltd. All rights reserved.