Enhancing sludge biodegradability through free nitrous acid pre-treatment at low exposure time

被引：32
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：
CHEMICAL ENGINEERING JOURNAL | 2017年 / 321卷
关键词：
Anaerobic digestion; Free-nitrous acid pre-treatment; Methane production; Secondary sludge biodegradability; Waste activated sludge; WASTE ACTIVATED-SLUDGE; WATER TREATMENT PLANTS; ANAEROBIC-DIGESTION; METHANE PRODUCTION; THERMAL PRETREATMENT; SECONDARY SLUDGE; SUBSTRATE RATIO; SEWAGE-SLUDGE; FATTY-ACIDS; FERMENTATION;
D O I：
10.1016/j.cej.2017.03.120
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The effectiveness of low free nitrous acid (FNA) pre-treatment times (PTs) (<8 h) on waste activated sludge (WAS) is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55 and 4.62 mg N-HNO2/L.) and three low PTs (2, 5 and 8 h) on WAS characteristics and methane generation. Increasing FNA concentrations and PTs resulted in an increase in the solubility of the organic matter (chemical oxygen demand, proteins and polysaccharides). Cell viability was below 15% in all cases at PTs higher than 2 h. Biochemical methane production tests (BMP) showed a significant increase (20-27%) on specific and total methane production (SMP and MP) when the sludge was pre-treated with 2.49- and 3.55 mg N-HNO2/L. during 5 h and 8 h. Increasing PT (>5 h) resulted in a decrease in MP due to a volatile solid reduction on WAS during the pretreatment. The highest FNA concentration tested (4.62 mg N-HNO2/L) did not further improve MP and SMP. This study clearly shows the effectiveness of the FNA sludge pretreatment at low exposure times. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：139 / 145
页数：7
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