| 上推流厌氧反应器连续干发酵猪粪产沼气试验研究 |
| 摘要点击 2831 全文点击 1238 修订日期：2011-07-10 |
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| 中文关键词 猪粪 上推流式厌氧反应器(UPAR) 连续干发酵 氨抑制 流动性 |
| 英文关键词 pig manure up plug-flow type anaerobic reactor (UPAR) continuous dry fermentation ammonia inhibition effluent liquidity |
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| 中文摘要 |
| 为解决猪粪连续干发酵存在的氨抑制和出料难等难题,在温度(25±2)℃、有机负荷为干物质(TS)4.44 g·(L·d)-1的条件下,采用上推流式厌氧反应器(UPAR)对猪粪进行连续干式发酵试验,研究了猪粪干发酵过程的产气情况、氨抑制现象和出料流动性,并考察了上推流厌氧反应器进行猪粪干发酵的可行性.试验采用4种不同TS质量分数(20%、25%、30%、35%)的猪粪作为原料,经160 d的运行.结果表明,进料TS质量分数对发酵过程有很大的影响, 4种不同进料TS质量分数稳定的池容产气率分别为2.40、1.73、0.89、0.62 L·(L·d)-1,进料TS质量分数为20%、25%和30%的产气效率明显优于进料TS=35%的产气效率.随着进料TS质量分数从20%增加到35%,氨氮质量浓度>2300 mg·L-1会出现明显的产气抑制.在进料TS=35%时,氨氮质量浓度能达到3800 mg·L-1,产气速率相对于进料TS=20%递减74.1%.当进料TS达到35%、出料TS质量分数达到17.1%、流速<0.002 m·s-1时,UPAR不能顺利出料. |
| 英文摘要 |
| To solve the problems of ammonia inhibition and discharging difficulty in continuous dry fermentation of pig manure, under the experimental conditions of temperature of (25±2)℃ and organic loading rate (TS) of 4.44 g·(L·d)-1, a lab-scale up plug-flow type anaerobic reactor(UPAR) was setup to investigate biogas production, ammonia inhibition, effluent liquidity, and the feasibility of continuous dry fermentation of pig manure using up plug-flow type anaerobic reactor. The experiment was operated for 160 days using the pig manure with four different TS mass fractions (20%, 25%, 30%, 35%) as feeding. Results showed that the feeding TS mass fraction exerted a significant influence on the dry fermentation of pig manure; the stable volumetric biogas production rates of four different feeding TS mass fractions were 2.40, 1.73, 0.89, and 0.62 L·(L·d)-1, respectively; the biogas producing efficiencies of the reactors with feeding TS mass fractions of 20%, 25% and 30% were obviously superior to that with feeding TS of 35%. With feeding TS mass fraction increased from 20% to 35%, obvious inhibition to biogas producing occurred when concentration of ammonia nitrogen reached more than 2300 mg·L-1. When the feeding TS mass fraction was 35%, the concentration of ammonia nitrogen could accumulate to 3800 mg·L-1 but biogas production rate decreased 74.1% of that with feeding TS of 20%. Additionally, while the feeding TS mass fraction was 35%, the effluent TS mass fraction achieved 17.1%, and the velocity of effluent was less than 0.002 m·s-1, the effluent of UPAR could not be smoothly discharged. |
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