Enhancing methane production from waste activated sludge using combined free nitrous acid and heat pre-treatment

被引:138
|
作者
Wang, Qilin [1 ]
Jiang, Guangming [1 ]
Ye, Liu [1 ,2 ]
Yuan, Zhiguo [1 ]
机构
[1] Univ Queensland, AWMC, Brisbane, Qld 4072, Australia
[2] Univ Queensland, Sch Chem Engn, Brisbane, Qld 4072, Australia
基金
澳大利亚研究理事会;
关键词
Free nitrous acid; Anaerobic digestion; Waste activated sludge; Methane; Pathogen; Heat; ANAEROBIC-DIGESTION; SEWAGE-SLUDGE; BIODEGRADABILITY; INHIBITION; PROTEIN; RAW;
D O I
10.1016/j.watres.2014.06.010
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Methane production from anaerobic digestion of waste activated sludge (WAS) is often limited by the slow degradation and poor substrate availability of WAS. Our previous study revealed that WAS pre-treatment using free nitrous acid (FNA, i.e. HNO2) is an economically feasible and environmentally friendly method for promoting methane production. In order to further improve methane production from WAS, this study presents a novel strategy based on combined FNA and heat pre-treatment. WAS from a full-scale plant was treated for 24 h with FNA alone (0.52-1.43 mg N/L at 25 degrees C), heat alone (35, 55 and 70 degrees C), and FNA (0.52-1.11 mg N/L) combined with heat (35, 55 and 70 degrees C). The pre-treated WAS was then used for biochemical methane potential tests. Compared to the control (no FNA or heat pre-treatment of WAS), biochemical methane potential of the pre-treated WAS was increased by 12-16%, 0-6%, 17-26%, respectively; hydrolysis rate was improved by 15-25%, 10-25%, 20-25%, respectively, for the three types of pre-treatment. Heat pretreatment at 55 and 70 degrees C, independent of the presence or absence of FNA, achieved approximately 4.5 log inactivation of pathogens (in comparison to similar to 1 log inactivation with FNA treatment alone), thus capable of producing Class A biosolids. The combined FNA and heat pre-treatment is an economically and environmentally attractive technology for the pre-treatment of WAS prior to anaerobic digestion, particularly considering that both FNA and heat can be produced as by-products of anaerobic sludge digestion. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:71 / 80
页数:10
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