期刊
BIORESOURCE TECHNOLOGY
卷 151, 期 -, 页码 258-264出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2013.10.066
关键词
BAF; Synergistic denitrification and chemical precipitation; Ferrous iron; Residue phosphorus control; Sludge settleability
资金
- National science and technology major project of China for water pollution control [2012ZX07206002-02]
- Ministry of Housing and Urban-Rural Development of China [2012-K7-18]
- Shenzhen Technology Innovation Plan [CXZZ201303 19100941767]
A series of laboratory-scale experiments for examining the feasibility and suitability of using Fe2+ as the precipitant dosed in the pre-denitrification stage of a modified BAF process employing simultaneous chemical precipitation of TSS and phosphorus were carried out. The effects of dosing Fe2+ on effluent quality and sludge characteristics of the pre-denitrification stage were assessed with comparing to the cases of no additional chemical dosing and dosing Fe3+. Results obtained demonstrated a sound performance of synergistic denitrification and chemical precipitation in pre-denitrification of the modified BAF process when dosing Fe salts, which showed enhanced by using Fe2+ as the dosed precipitant in increasing the denitrification loading rate, exhibiting a better controlling of the residual phosphorus in pre-denitrification effluent, and improving sludge settleability. Dosing Fe salt showed no adverse impact in removing COD, but resulted in a relatively higher SS content in the pre-denitrification effluent. (C) 2013 Elsevier Ltd. All rights reserved.
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