Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: Effect of exposure time and concentration

被引：61

作者：

Zahedi, S. ^{[1
]}

Icaran, P. ^{[2
]}

Yuan, Z. ^{[3
]}

Pijuan, M. ^{[1
]}

机构：

[1] Univ Girona, Catalan Inst Water Res ICRA, Emili Grahit St 101,H2O Bldg,Sci & Technol Pk, Girona 17003, Spain

[2] FCC Aqualia, Dept Innovat & Technol, Balmes St 36,6th Floor, Barcelona 08007, Spain

[3] Univ Queensland, Adv Water Management Ctr, St Lucia, Qld 4072, Australia

来源：

BIORESOURCE TECHNOLOGY | 2016年 / 216卷

关键词：

Anaerobic digestion; Free-nitrous acid pre-treatment; Methane production; Mixed sludge; Sludge biodegradability; ANAEROBIC CO-DIGESTION; METHANE PRODUCTION; SEWAGE-SLUDGE; THERMAL PRETREATMENT; FERMENTATION; BIODEGRADABILITY; GREEN;

D O I：

10.1016/j.biortech.2016.06.038

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO2/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO2/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：870 / 875

页数：6

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