The effect of sludge recirculation rate on a UASB-digester treating domestic sewage at 15 °C | Zendy

Lei Zhang | Zendy; T.L.G. Hendrickx | Zendy; Christel Kampman | Zendy; G. Zeeman | Zendy; Hardy Temmink | Zendy; Weiguang Li | Zendy; C.J.N. Buisman | Zendy

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The effect of sludge recirculation rate on a UASB-digester treating domestic sewage at 15 °C

Author(s) -

Lei Zhang,

T.L.G. Hendrickx,

Christel Kampman,

G. Zeeman,

Hardy Temmink,

Weiguang Li,

C.J.N. Buisman

Publication year - 2012

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2012.487

Subject(s) - biogas , sewage sludge , anaerobic exercise , anaerobic digestion , waste management , chemical oxygen demand , environmental science , sewage , pulp and paper industry , sewage sludge treatment , biogas production , sewage treatment , chemistry , environmental engineering , methane , engineering , physiology , organic chemistry , biology

The anaerobic treatment of low strength domestic sewage at low temperature is an attractive and important topic at present. The upflow anaerobic sludge bed (UASB)-digester system is one of the anaerobic systems to challenge low temperature and concentrations. The effect of sludge recirculation rate on a UASB-digester system treating domestic sewage at 15 °C was studied in this research. A sludge recirculation rate of 0.9, 2.6 and 12.5% of the influent flow rate was investigated. The results showed that the total chemical oxygen demand (COD) removal efficiency rose with increasing sludge recirculation rate. A sludge recirculation rate of 0.9% of the influent flow rate led to organic solids accumulation in the UASB reactor. After the sludge recirculation rate increased from 0.9 to 2.6%, the stability of the UASB sludge was substantially improved from 0.37 to 0.15 g CH₄-COD/g COD, and the bio-gas production in the digester went up from 2.9 to 7.4 L/d. The stability of the UASB sludge and bio-gas production in the digester were not significantly further improved by increasing sludge recirculation rate to 12.5% of the influent flow rate, but the biogas production in the UASB increased from 0.37 to 1.2 L/d. It is recommended to apply a maximum sludge recirculation rate of 2-2.5% of the influent flow rate in a UASB-digester system, as this still allows energy self-sufficiency of the system.

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