数字农科院2.0

Recovery Of Unstable Digestion Of V.egetable Waste By Adding T race Elements Using The Bicarbonate Alkalinity To Total Alkalinity Ratio As An Early Warning Indicator

文献类型： 外文期刊

作者： Li, D; Sun, J; Cao, Q; Chen, YC; Liu, XF; Ran, Y

作者机构：

关键词： Vegetable waste; Anaerobic digestion; Organic loading rate; Early warning; Trace element; Recovery of unstable digestion

期刊名称： BIODEGRADATION

ISSN： 0923-9820

年卷期： 2019 年 30 卷 1 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Vegetable waste (VW) is highly perishable and susceptible to acidification during anaerobic digestion, which inhibits biogas production. Effective process monitoring, diagnosis and control are necessary to maintain stable anaerobic digestion at a high organic loading rate (OLR). Continuous mesophilic digestion was conducted at OLRs of 0.5, 1.0, 1.5, 2.0, 3.0, 3.5 and 4.0g volatile solids (VS)/(Ld) with effluent recirculation (ER) in a reactor with total volume of 70L. The effectiveness of three early warning indicators was validated. The ability of trace elements (TEs) (Fe, Co and Ni) to recover unstable VW digestion systems was evaluated. The results showed that the ratio of bicarbonate alkalinity (BA) to total alkalinity (TA) was a more effective warning indicator than the ratios of methane (CH4) to carbon dioxide and volatile fatty acids (VFAs) to TA. When the ratio of BA/TA was lower than 0.9, the digestion system tended to be unstable. ER maintained a stable OLR of 1.5g VS/(Ld). The addition of TEs achieved a maximum stable OLR of 3.5g VS/(Ld) with an average volumetric biogas production rate of 1.91 L/(Ld). Severe VFAs accumulation and unrecoverable instability occurred at an OLR of 4.0g VS/(Ld). The supplementation of ammonium bicarbonate was not useful for the recovery of the unstable system when the OLR was greater than 3.5g VS/(Ld) for the digestion of VW. The specific methane production was approximately 340 L/kg VS during the stable period with a digestion efficiency of 85%.

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