影响人粪沼液氨氮吹脱传质速率的因素分析
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摘要
以人粪厌氧发酵沼液为研究对象,采用吹脱法对其进行预处理,改善其C/N过低不利于生化处理的问题。研究了氨氮吹脱的4个主要影响因素(初始pH、空气流量、温度和填料)对沼液吹脱效果和总传质系数的影响。结果表明:在pH=10,空气流量为300 L/h,温度为50℃、投加填料的最优工艺条件下,其总传质系数为0.4535 h~(-1)。
Air stripping method was adopted for pre-treatment of biogas slurry from anaerobic digestion of faecal sludge, in order to improve its low carbon nitrogen ratio which was not good for biochemical treatment. Influences of four main factors(initial pH, air flow, temperature and filler) on stripping effect and total mass transfer coefficient were studies. The study results showed that temperature had a great influence on the mass transfer coefficient of the stripping system, and the total mass transfer coefficient of ammonia nitrogen stripping at 50 ℃ was 2.3 times of that at 30 ℃. The optimal process parameters were achieved when adding fillers under the conditions of pH=10, air flow rate of 300 L/h, temperature of 50 ℃. The total mass transfer coefficient under optimal process condition was 0.4535 h~(-1).
Air stripping method was adopted for pre-treatment of biogas slurry from anaerobic digestion of faecal sludge, in order to improve its low carbon nitrogen ratio which was not good for biochemical treatment. Influences of four main factors(initial pH, air flow, temperature and filler) on stripping effect and total mass transfer coefficient were studies. The study results showed that temperature had a great influence on the mass transfer coefficient of the stripping system, and the total mass transfer coefficient of ammonia nitrogen stripping at 50 ℃ was 2.3 times of that at 30 ℃. The optimal process parameters were achieved when adding fillers under the conditions of pH=10, air flow rate of 300 L/h, temperature of 50 ℃. The total mass transfer coefficient under optimal process condition was 0.4535 h~(-1).
引文
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[14] Liao P H, Chen A, Lo K V. Removal of nitrogen from swine manure wastewaters by ammonia stripping[J]. Bioresource Technology,1995,54(1):17-20.
[2] 叶小梅,常志州,钱玉婷,等. 江苏省大中型沼气工程调查及沼液生物学特性研究[J]. 农业工程学报,2012,28(6):222-227.
[3] Woli K P, Nagumo T, Kuramochi K, et al. Evaluating river water quality through land use analysis and N budget approaches in livestock farming areas[J]. Science of the Total Environment,2004,329(1/2/3):61-74.
[4] 姜丽娜,王强,李艾芬,等. 休闲稻田消解沼液生态效应及其对水稻安全生产影响研究[J]. 农业环境科学学报,2011,30(12):2483-2490.
[5] Lei X, Sugiura N, Feng C, et al. Pretreatment of anaerobic digestion ef?uent with ammonia stripping and biogas puri?cation[J]. Journal of Hazardous Materials,2007, 145(3):391-397.
[6] Bonmatí A, Flotats X. Air stripping of ammonia from pig slurry: characterisation and feasibility as a pre- or post-treatment to mesophilic anaerobic digestion[J]. Waste Management,2003, 23(3):261-272.
[7] 隋倩雯,董红敏,朱志平,等. 提高猪场沼液净化处理效果的氨吹脱控制参数[J]. 农业工程学报,2012,28(11):205-211.
[8] 李勇. Fenton-氨吹脱-SBR处理畜禽粪尿厌氧消化液的试验研究[D]. 长沙: 湖南农业大学,2012.
[9] Gustin S, Marinsek-Logar R. Effect of pH, temperature and air flow rate on the continuous ammonia stripping of the anaerobic digestion effluent[J]. Process Safety and Environmental Protection,2011,89(1):61-66.
[10] Wu Y, Li Q, Li F. Desulfurization in the gas-continuous impinging stream gas-liquid reactor[J]. Chemical Engineering Science,2007,62(6):1814-1824.
[11] Matter-Müller C, Gujer W, Giger W. Transfer of volatile substances from water to the atmosphere[J]. Water Research,1981,15(11):1271-1279.
[12] 沈耀良,王宝贞. 吹脱法去除渗滤液中氨的动力学及机理[J]. 污染防治技术,1999,12(2):67-71.
[13] 汪海涛,周康根,彭佳乐,等. 多面球填料塔的氨吹脱传质速率的影响因素[J]. 中南大学学报(自然科学版),2012,43(4):1211-1216.
[14] Liao P H, Chen A, Lo K V. Removal of nitrogen from swine manure wastewaters by ammonia stripping[J]. Bioresource Technology,1995,54(1):17-20.