为提高餐厨垃圾厌氧消化产气性能,评估不同预处理策略的有效性和经济可行性.采用全自动CH4潜力测试系统(AMPTS Ⅱ),探究不同预处理策略(超声、碱处理、中温、高温)对餐厨垃圾厌氧消化产CH4性能及其能量平衡的影响.研究结果表明,不同预处理策略对CH4累计产量的提升效果介于7.9％～16.3％,高温预处理后的累积CH4产量最高,达到225.0 mL CH4·(g·VS)-1,对照组的累计CH4产量仅为193.5 mL CH4·(g·VS)-1.此外,比较不同模型的适用性,其中修正的Gompertz二阶模型解释了餐厨垃圾两阶段的降解特性,为第二阶段难降解物质产CH4潜力提供了预测.厌氧消化过程中溶解性有机物(SCOD)、氨氮、蛋白质和多糖浓度变化趋势与CH4产量一致,表明预处理后的餐厨垃圾能够提供更多的有机消化物质,提高厌氧消化的效率.预处理后餐厨垃圾表面结构的空隙变大,空隙更密集,给厌氧微生物提供更多的附着点,提高厌氧消化系统产气速率.能量平衡分析结果表明,不同处理组的能量提升效益介于8.3％～15.1％,高温组的净能量收益最高为293.5 kJ.这将为今后优化餐厨垃圾预处理策略提供理论参考依据,为餐厨垃圾资源化和能源化利用提供新途径.
Impact of pretreatment strategies on anaerobic digestion of food waste and energy balance analysis
To enhance methane production from food waste through anaerobic digestion,the effectiveness and economic feasibility of various pretreatment methods were evaluated.The automatic methane potential test system(AMPTS Ⅱ)was used to explore the effects of various pretreatment methods on methane production and energy balance during the anaerobic digestion of food waste.The results showed that various pretreatment methods resulted in a methane yield increase of 7.9％to 16.3％.Thermophilic pretreatment showed the highest cumulative methane yield of 225.0 mL CH4·(g·VS)-1,while the control group only had a cumulative methane yield of 193.5 mL CH4·(g·VS)-1.Comparing the applicability of the Cone,Modified Gompertz and Modified Gompertz second-order equation models to pretreated food waste,the Modified Gompertz second-order equation model explained the degradation characteristics of the two stages of FW and provided predictions for the methane production potential of refractory substances in the second stage.The concentration trends of dissolved organic matter(SCOD),ammonia nitrogen,protein,and polysaccharides during anaerobic digestion were consistent with methane production.This study suggested that pretreated food waste could provide a greater amount of organic digested substances and ultimately improve the efficiency of anaerobic digestion.In addition,after pretreatment,the voids in the surface structure of food waste become larger and denser,providing more attachment points for anaerobic microorganisms and improving the methane production rate of the anaerobic digestion system.The results of the energy balance analysis indicated that the energy efficiency of different treatment groups ranged from 8.3％to 15.1％,and the high temperature group had the highest net energy benefit of 293.5 kJ.This study provides a theoretical framework for optimizing food waste pretreatment and offers a new approach to food waste resource and energy utilization.
国家科技期刊平台
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