Free nitrite pretreatment enhanced methane production from co-digestion of waste activated sludge and tobacco waste
XU Xue-qin1, LI Xiao-lan1, HUANG Shan-song1, JIA Hai-jiang1, ZHOU Yun1, LI Xiao-ming2
1. China Tobaco Guangxi Industrial Co. Ltd, Nanning 530001, China;
2. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
In order to improve the production efficiency of methane from sludge anaerobic digestion, this study reported a new method of adding tobacco waste (TW) and free nitrous acid (FNA) to the sludge. Experimental results showed that the optimal mixing ratio of sludge and TW was 1:1, and the corresponding methane yield was 203.6mL/g per gram volatile suspended solids (VSS), which was about 1.3times of that in sole sludge digestion. Co-digestion of sludge and TW benefited the consumption of protein, polysaccharide and cellulose in digestive matrix. Further application of free nitrous acid (FNA) pretreatment to improve the efficiency of co-digestion of sludge and TW, the optimal concentration of FNA was 1.5mg/L, the corresponding maximum methane yield was 286.4mL/g VSS. FNA pretreatment could promote the hydrolysis and acidification of organic matters, providing an sufficient digestive matrix for methanogenic Archaea. In addition, FNA pretreatment also enhanced the relative abundance of functional microorganisms of Bacteroidetes and Firmicutes.
Zhao J, Wang D, Li X, et al. Free nitrous acid serving as a pretreatment method for alkaline fermentation to enhance short-chain fatty acid production from waste activated sludge[J]. Water Research, 2015,78:111-120.
Feng L, Chen Y, Zheng X. Enhancement of waste activated sludge protein conversion and volatile fatty acids accumulation during waste activated sludge anaerobic fermentation by carbohydrate substrate addition:the effect of pH[J]. Environmental Science & Technology, 2009,43(12):4373-4380.
[7]
Zhao J, Zhang C, Wang D, et al. Revealing the Underlying Mechanisms of How Sodium Chloride Affects Short-Chain Fatty Acid Production from the Cofermentation of Waste Activated Sludge and Food Waste[J]. ACS Sustainable Chemistry & Engineering, 2016,4(9):4675-4684.
[8]
Liu Y, Dong J, Liu G, et al. Co-digestion of tobacco waste with different agricultural biomass feedstocks and the inhibition of tobacco viruses by anaerobic digestion[J]. Bioresource Technology, 2015,189:210-216.
[9]
Li X, Zhao J, Wang D, et al. An efficient and green pretreatment to stimulate short-chain fatty acids production from waste activated sludge anaerobic fermentation using free nitrous acid[J]. Chemosphere, 2016,144:160-167.
[10]
Zhao J, Liu Y, Ni B, et al. Combined effect of free nitrous acid pretreatment and sodium dodecylbenzene sulfonate on short-chain fatty acid production from waste activated sludge[J]. Scientific Reports, 2016,6,21622.
[11]
Anthonisen A C, Loehr R C, Prakasam T B, et al. Inhibition of nitrification by ammonia and nitrous acid.[J]. Journal-Water Pollution Control Federation, 1976,48(5):835-52.
[12]
Zhao J, Yang Q, Li X, et al. Effect of initial pH on short chain fatty acid production during the anaerobic fermentation of membrane bioreactor sludge enhanced by alkyl polyglcoside[J]. International Biodeterioration & Biodegradation, 2015,104:283-289.
[13]
Goering H K, VanSoest P J. Forage fiber analysis[M]//Agriculture Handbook. Agricuture Research Service, US Department of Agriculture." 1970.
[14]
Feng Y, Zhang Y, Quan X, et al. Enhanced anaerobic digestion of waste activated sludge digestion by the addition of zero valent iron.[J]. Water Research, 2014,52(4):242-250.
[15]
Zhang D, Fu X, Jia S, et al. Excess sludge and herbaceous plant co-digestion for volatile fatty acids generation improved by protein and cellulose conversion enhancement.[J]. Environmental Science and Pollution Research, 2016,23(2):1-13.
[16]
Wang D, Zhao J, Zeng G, et al. How does poly (hydroxyalkanoate) affect methane production from the anaerobic digestion of waste-activated sludge?[J]. Environmental Science & Technology, 2015,49(20):12253-12262.
[17]
Ometto F, Quiroga G, Pšeni?ka P, et al. Impacts of microalgae pre-treatments for improved anaerobic digestion:thermal treatment, thermal hydrolysis, ultrasound and enzymatic hydrolysis.[J]. Water Research, 2014,65:350-361.
[18]
Limam R D, Chouari R, Mazéas L, et al. Members of the uncultured bacterial candidate division WWE1are implicated in anaerobic digestion of cellulose.[J]. Microbiologyopen, 2014, 3(2):157-167.
[19]
Dai X, Li X, Zhang D, et al. Simultaneous enhancement of methane production and methane content in biogas from waste activated sludge and perennial ryegrass anaerobic co-digestion:The effects of pH and C/N ratio.[J]. Bioresource Technology, 2016,216:323.
[20]
Wang K, Yin J, Shen D, et al. Anaerobic digestion of food waste for volatile fatty acids (VFAs) production with different types of inoculum:Effect of pH[J]. Bioresource Technology, 2014,161(6):395-401.
[21]
Guo W, Wu Q, Yang S, et al. Optimization of ultrasonic pretreatment and substrate/inoculum ratio to enhance hydrolysis and volatile fatty acid production from food waste[J]. Rsc Advances, 2014,4(95):53321-53326.
[22]
Zhao J, Wang D, Li X, et al. Improved biological phosphorus removal induced by an oxic/extended-idle process using glycerol and acetate at equal fractions[J]. Rsc Advances, 2016,6(89):86165-86173.
[23]
Luo J, Feng L, Chen Y, et al. Alkyl polyglucose enhancing propionic acid enriched short-chain fatty acids production during anaerobic treatment of waste activated sludge and mechanisms[J]. Water Research, 2015,73:332-341.
[24]
Lee W S, Chua A, Yeoh H K, et al. A review of the production and applications of waste-derived volatile fatty acids[J]. Chemical Engineering Journal, 2014,235(1):83-99.
[25]
Mu H, Chen Y. Long-term effect of ZnO nanoparticles on waste activated sludge anaerobic digestion[J]. Water Research, 2011, 45(17):5612-5620.
