沼液全量连续回流对稻秸厌氧发酵特性的影响

doi:10.11934/j.issn.1673-4831.2017.09.011

摘要/Abstract

摘要：

秸秆厌氧发酵沼气工程中合理的沼液回流可减少沼液排放量，降低后续沼液处置利用成本。以稻秸为底物，采用完全混合搅拌反应器（CSTR）半连续发酵方式，研究沼液全量连续回流对稻秸厌氧发酵特性的影响，旨在为明确沼液全量回流对秸秆厌氧发酵的影响机制、改进沼液全量回流技术提供科学依据。结果表明：在100%沼液回流条件下连续回流50 d时系统运行稳定，总固体（TS）产气率、挥发性固体（VS）产气率及容积产气率分别稳定在245 mL·g^-1、300 mL·g^-1及0.74 L·L^-1·d^-1。但随着运行时间延长，回流天数达85 d时，虽然发酵液pH值和沼气中φ（CH₄）无明显变化，但系统产气效率明显受到抑制。产气受抑制阶段与产气稳定阶段相比，TS产气率、VS产气率及容积产气率分别下降到186 mL·g^-1、226 mL·g^-1及0.56 L·L^-1·d^-1，下降幅度达24%。进一步分析表明，沼液中ρ（NH₄⁺-N）下降到185 mg·L^-1，下降幅度为71%；主要金属离子总质量浓度增加到4.13 g·L^-1，增加幅度为342%。初步判断沼液全量连续回用会因氮含量严重下降和盐分积累致系统产气量下降，但真实原因还有待进一步研究。

关键词: 沼液回流, 厌氧发酵, 水稻秸秆, 沼气, 完全混合搅拌反应器(CSTR)

Abstract:

Rational reflux or reuse of biogas slurry in rice straw anaerobic biogas digesters can reduce amount of the slurry to be discharged, thus lowering the cost of subsequent disposal of the slurry. For the purpose of providing scientific basis for modification of the technology of full reuse of biogas slurry, an experiment was carried out using rice straw as substance and a continuous stirred tank reactor (CSTR) to study effect of continuous full reflux of biogas slurry on anaerobic fermentation of rice straw in an attempt to elaborate mechanism of the effect. Results show that using continuous full reflux of biogas slurry, the reaction system ran stably for 50 days with TS, VS and volumetric biogas production rate stabilized at 245 mL·g^-1, 300 mL·g^-1 and 0.74 L·L^-1·d^-1, respectively. However, with the system running on till 85 days, though no apparent changes were observed in pH of the solution and volume fraction of methane in the digester, TS, VS and volumetric biogas production rate declined to 186 mL·g^-1, 226 mL·g^-1 and 0.56 L·L^-1·d^-1, respectively, or by around 24% as compared with their respective ones in the stable period. Further analysis shows that ammonia nitrogen in the slurry dropped to 185 mg·L^-1 or by 71% in concentration. Meanwhile, the total concentration of main metal ions rose up to 4.13 g·L^-1 or by 342%. Consequently, it can be preliminarily ascertained that continuous full reflux of biogas slurry would affect biogas production of the system, which may be attributed to the significant decrease in nitrogen content and accumulation of salts caused by full reflux of biogas slurry in the solution of the system. However, further efforts should be made to dig its real causes.

Key words: reflux of biogas slurry, anaerobic digestion, rice straw, biogas, continuous stirred tank reactor(CSTR)

中图分类号:

X705
S216.4

张应鹏, 陈广银, 黑昆仑, 杨一帆, 许彩云, 常志州. 沼液全量连续回流对稻秸厌氧发酵特性的影响[J]. 生态与农村环境学报, 2017, 33(9): 845-851.

ZHANG Ying-peng, CHEN Guang-yin, HEI Kun-lun, YANG Yi-fan, XU Cai-yun, CHANG Zhi-zhou. Effects of Full Continuous Reflux of Biogas Slurry on Characteristics of Rice Straw Anaerobic Digestion.[J]. Journal of Ecology and Rural Environment, 2017, 33(9): 845-851.

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