Effect of oxygen dosing point and mixing on the microaerobic removal of hydrogen sulphide in sludge digesters

被引：93

作者：

Diaz, I. ^{[1
]}

Perez, S. I. ^{[1
]}

Ferrero, E. M. ^{[1
]}

Fdz-Polanco, M. ^{[1
]}

机构：

[1] Univ Valladolid, Dept Chem Engn & Environm Technol, Escuela Ingn Ind, E-47011 Valladolid, Spain

来源：

BIORESOURCE TECHNOLOGY | 2011年 / 102卷 / 04期

关键词：

Biogas; Sulphide; Microaerobic; Sulphide-oxidising bacteria; Sludge digestion; ANAEROBIC-DIGESTION; HIGH-SULFATE; SULFUR-COMPOUNDS; WASTE-WATER; SP-NOV;

D O I：

10.1016/j.biortech.2010.12.016

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Limited oxygen supply to anaerobic sludge digesters to remove hydrogen sulphide from biogas was studied. Micro-oxygenation showed competitive performance to reduce considerably the additional equipment necessary to perform biogas desulphurization. Two pilot-plant digesters with an HRT of similar to 20 d were micro-oxygenated at a rate of 0.25 NL per L of feed sludge with a removal efficiency higher than 98%. The way of mixing (sludge or biogas recirculation) and the point of oxygen supply (headspace or liquid phase) played an important role on hydrogen sulphide oxidation. While micro-oxygenation with sludge recirculation removed only hydrogen sulphide from the biogas, dissolved sulphide was removed if micro-oxygenation was performed with biogas recirculation. Dosage in the headspace resulted in a more stable operation. The result of the hydrogen sulphide oxidation was mostly elemental sulphur, partially accumulated in the headspace of the digester, where different sulphide-oxidising bacteria were found. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：3768 / 3775

页数：8

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