KOH/NH_3·H_2O复合预处理稻草厌氧消化优化研究
|
摘要
文章提出一种KOH/NH_3·H_2O复合预处理稻草进行厌氧消化的绿色环保高效预处理方法,既能使稻草木质纤维素更好地进行生物降解产生物甲烷,同时能调节厌氧消化过程中的C/N,节省营养元素调配成本,且厌氧消化后产生的沼渣含K可直接用作沼肥,不会产生环境污染。运用正交实验法对预处理剂浓度(1%KOH+1%NH_3·H_2O,2%KOH+2%NH_3·H_2O,2%KOH+4%NH_3·H_2O,4%KOH+2%NH_3·H_2O)、预处理温度(20℃,30℃,40℃,50℃)、水添加量(稻草干重的3倍,6倍,9倍,12倍)、预处理时间(1 d,2 d,3 d,4 d)进行了优化筛选,试验结果表明,复合预处理稻草厌氧消化甲烷总产量为8738～10492 mL,比未预处理稻草(7343 mL)提高了19.0%～42.9%,效果明显(p<0.05)。对1%KOH+1%NH_3·H_2O复合预处理与2%KOH,2%NH_3·H_2O单试剂预处理稻草厌氧消化性能进行了比较。试验表明,复合预处理组累积产甲烷量及单位VS产甲烷量分别为10404 mL,244 mL·g~(-1)VS,比未处理稻草提高41.7%,比2%KOH预处理组提高19.4%,比2%NH_3·H_2O预处理组提高16.4%;1%KOH+1%NH_3·H_2O复合预处理组T_(80)为34 d,比未预处理,2%KOH,2%NH_3·H_2O单试剂预处理组分别提前9 d,7 d,2 d。KOH/NH_3·H_2O复合预处理能够促进稻草厌氧消化产甲烷,缩短厌氧消化周期,增加沼渣沼液肥效。
Anaerobic digestion of rice straw was conducted, and pretreatment was made with combined potassium hydroxide(KOH) and ammonia solution(NH_3·H_2O),which was aimed to enhance the biodegradation of lignocellulose for methane production and regulate C/N ratio of anaerobic digestion. The orthogonal experimental method was adopted, and the different concentration of KOH/NH_3·H_2O(1%KOH+1%NH_3·H_2O, 2%KOH+2%NH_3·H_2O, 2%KOH+4%NH_3·H_2O, 4%KOH+2%NH_3·H_2O), pretreatment temperature(20℃, 30℃, 40℃, 50℃), the amount of water addition(3 times, 6 times, 9 times, 12 times of dry straw), pretreatment time(1 d, 2 d, 3 d, 4 d), were tested. The results showed that the total methane yield of pretreated straw were 8738～10492 mL, which was 19.0%～42.9%(p<0.05) higher than that of untreated(7343 mL). The 1% KOH and 1% NH_3·H_2O combined pretreatment was compared with sole 2% KOH and sole 2% NH_3·H_2O pretreatment. The 1% KOH and 1% NH_3·H_2O combined pretreatment obtained cumulative methane production of 10404 mL and the VS methane yield of 244 mL·g~(-1), which was 41.7% higher than that of the untreated, 19.4% higher than the sole 2% KOH pretreatment, and 16.4% higher than the sole 2% NH_3·H_2O pretreatment. The T80(80% of methane production) of 1% KOH and 1% NH_3·H_2O combined pretreatment was 34 days, which was 9, 7, and 2 days earlier than the un-pretreated, sole 2% KOH and sole 2% NH_3·H_2O pretreatment, respectively. The KOH and NH_3·H_2O combined pretreatment had better effect to improve methane yield of rice straw,and shorten the anaerobic digestion cycle.
Anaerobic digestion of rice straw was conducted, and pretreatment was made with combined potassium hydroxide(KOH) and ammonia solution(NH_3·H_2O),which was aimed to enhance the biodegradation of lignocellulose for methane production and regulate C/N ratio of anaerobic digestion. The orthogonal experimental method was adopted, and the different concentration of KOH/NH_3·H_2O(1%KOH+1%NH_3·H_2O, 2%KOH+2%NH_3·H_2O, 2%KOH+4%NH_3·H_2O, 4%KOH+2%NH_3·H_2O), pretreatment temperature(20℃, 30℃, 40℃, 50℃), the amount of water addition(3 times, 6 times, 9 times, 12 times of dry straw), pretreatment time(1 d, 2 d, 3 d, 4 d), were tested. The results showed that the total methane yield of pretreated straw were 8738～10492 mL, which was 19.0%～42.9%(p<0.05) higher than that of untreated(7343 mL). The 1% KOH and 1% NH_3·H_2O combined pretreatment was compared with sole 2% KOH and sole 2% NH_3·H_2O pretreatment. The 1% KOH and 1% NH_3·H_2O combined pretreatment obtained cumulative methane production of 10404 mL and the VS methane yield of 244 mL·g~(-1), which was 41.7% higher than that of the untreated, 19.4% higher than the sole 2% KOH pretreatment, and 16.4% higher than the sole 2% NH_3·H_2O pretreatment. The T80(80% of methane production) of 1% KOH and 1% NH_3·H_2O combined pretreatment was 34 days, which was 9, 7, and 2 days earlier than the un-pretreated, sole 2% KOH and sole 2% NH_3·H_2O pretreatment, respectively. The KOH and NH_3·H_2O combined pretreatment had better effect to improve methane yield of rice straw,and shorten the anaerobic digestion cycle.
引文
[1] 朱超,等. 接种量对稻草厌氧消化产气性能影响[J]. 可再生能源, 2016, 34(4): 593-599.
[2] 孟颖,等.氨化预处理玉米秸秆与餐厨垃圾混合两相厌氧消化性能研究[J]. 可再生能源, 2014, 32(9): 1365-1370.
[3] Phitsuwan, P, et al. Evaluation of fuel ethanol production from aqueous ammonia-treated rice straw via simultaneous saccharification and fermentation[J]. Biomass Bioenergy, 2016, 93: 150-157.
[4] Pellera, F.M, et al. Effect of alkaline pretreatment on anaerobic digestion of olive mill solid waste[J]. Waste Management, 2016, 58: 160-168.
[5] 何艳峰,等. NaOH固态预处理对稻草厌氧消化产气量影响的机理研究(英文)[J].International Conference on Biomass Energy Technologies Proceeding, 2008(2): 482-488.
[6] Shetty, D.J, et al. Alkali pretreatment at ambient temperature: A promising method to enhance biomethanation of rice straw[J]. Bioresource Technology, 2016, 226: 80-88.
[7] Li, L, et al. Pretreatment of Corn Stover for Methane Production with the Combination of Potassium Hydroxide and Calcium Hydroxide[J]. Energy Fuels, 2015, 29(9): 1508-1541.
[8] Zheng, Y, et al. Pretreatment of lignocellulosic biomass for enhanced biogas production[J]. Progress in Energy Combustion Science, 2014, 42(1): 35-53.
[9] Moset, V, et al. Combined low thermal alkali addition and mechanical pre-treatment to improve biogas yield from wheat straw[J]. Journal of Cleaner Production, 2018, 172:1391-1398.
[10] Liu, X, et al.,Pretreatment of wheat straw with potassium hydroxide for increasing enzymatic and microbial degradability[J]. Bioresour Technol, 2015, 185:150-157.
[11] Jaffar, M, et al.,Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion[J]. Chinese Journal of Chemical Engineering, 2016, 24(3): 404-409.
[12] Z, S, et al. Hydrolyzabilities of different corn stover fractions after aqueous ammonia pretreatment[J]. Applied Biochemistry Biotechnology, 2014, 172(3): 1506-1516.
[13] 马淑勍,等. 氨化预处理对稻草厌氧消化产气性能影响[J]. 农业工程学报, 2011, 27(6): 294-299.
[14] Mahdy, A, et al. Ammonia tolerant inocula provide a good base for anaerobic digestion of microalgae in third generation biogas process[J]. Bioresource Technology, 2017, 225: 272-278.
[15] Americ PJB.Standard methods for the examination of water and wastewater[D].American Public Health Association,1971.
[16] 魏域芳,等. 不同预处理玉米秸秆与牛粪混合厌氧消化产气性能比较[J]. 中国沼气, 2016, 34(2): 36-40.
[2] 孟颖,等.氨化预处理玉米秸秆与餐厨垃圾混合两相厌氧消化性能研究[J]. 可再生能源, 2014, 32(9): 1365-1370.
[3] Phitsuwan, P, et al. Evaluation of fuel ethanol production from aqueous ammonia-treated rice straw via simultaneous saccharification and fermentation[J]. Biomass Bioenergy, 2016, 93: 150-157.
[4] Pellera, F.M, et al. Effect of alkaline pretreatment on anaerobic digestion of olive mill solid waste[J]. Waste Management, 2016, 58: 160-168.
[5] 何艳峰,等. NaOH固态预处理对稻草厌氧消化产气量影响的机理研究(英文)[J].International Conference on Biomass Energy Technologies Proceeding, 2008(2): 482-488.
[6] Shetty, D.J, et al. Alkali pretreatment at ambient temperature: A promising method to enhance biomethanation of rice straw[J]. Bioresource Technology, 2016, 226: 80-88.
[7] Li, L, et al. Pretreatment of Corn Stover for Methane Production with the Combination of Potassium Hydroxide and Calcium Hydroxide[J]. Energy Fuels, 2015, 29(9): 1508-1541.
[8] Zheng, Y, et al. Pretreatment of lignocellulosic biomass for enhanced biogas production[J]. Progress in Energy Combustion Science, 2014, 42(1): 35-53.
[9] Moset, V, et al. Combined low thermal alkali addition and mechanical pre-treatment to improve biogas yield from wheat straw[J]. Journal of Cleaner Production, 2018, 172:1391-1398.
[10] Liu, X, et al.,Pretreatment of wheat straw with potassium hydroxide for increasing enzymatic and microbial degradability[J]. Bioresour Technol, 2015, 185:150-157.
[11] Jaffar, M, et al.,Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion[J]. Chinese Journal of Chemical Engineering, 2016, 24(3): 404-409.
[12] Z, S, et al. Hydrolyzabilities of different corn stover fractions after aqueous ammonia pretreatment[J]. Applied Biochemistry Biotechnology, 2014, 172(3): 1506-1516.
[13] 马淑勍,等. 氨化预处理对稻草厌氧消化产气性能影响[J]. 农业工程学报, 2011, 27(6): 294-299.
[14] Mahdy, A, et al. Ammonia tolerant inocula provide a good base for anaerobic digestion of microalgae in third generation biogas process[J]. Bioresource Technology, 2017, 225: 272-278.
[15] Americ PJB.Standard methods for the examination of water and wastewater[D].American Public Health Association,1971.
[16] 魏域芳,等. 不同预处理玉米秸秆与牛粪混合厌氧消化产气性能比较[J]. 中国沼气, 2016, 34(2): 36-40.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |