A two-stage strategy combining vermicomposting and membrane-covered aerobic composting to achieve value-added recycling of kitchen waste solid residues

Waste Disposal & Sustainable Energy Pub Date : 2024-08-03 DOI:10.1007/s42768-024-00206-1

Nan Hu, Zhenye Tong, Fei Li, Xia Zhang, Haofeng Gao, Jun Zhou

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Abstract

Kitchen waste solid residues (KWSR) are secondary organic solid wastes generated from kitchen waste (KW) after oil and slurry separation. In this study, two recycling methods for KWSR were investigated: direct membrane-covered aerobic composting (T1) and a two-stage method combining vermicomposting with membrane-covered aerobic composting (T2). Compared with T1, T2 had a faster increase in pile temperature, a shorter thermal stage, lower greenhouse gas emissions and higher NH₃ emissions. The vermicomposting promoted the formation of humus and shortened the maturation time during aerobic composting, resulting in a shorter treatment period for T2 (18 d) than for T1 (21 d). The initial bacterial communities of T1 and T2 were significantly different, but they became similar as composting progressed. The economic feasibility analysis showed that 1000 kg of KWSR generated a profit of 285 CNY using the T2 method, which was higher than that of T1 (36 CNY). The outcomes of the present study provide an improved strategy for the management of KWSR.

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结合蚯蚓堆肥和膜覆盖好氧堆肥的两阶段战略，实现厨余固体残渣的增值回收利用

厨余固体残渣（KWSR）是厨余（KW）经过油和泥浆分离后产生的二次有机固体废物。本研究调查了两种回收利用厨余固体残渣的方法：直接膜覆盖好氧堆肥法（T1）和蚯蚓堆肥与膜覆盖好氧堆肥相结合的两阶段法（T2）。与 T1 相比，T2 的堆温上升更快，热阶段更短，温室气体排放量更低，NH3 排放量更高。蚯蚓堆肥促进了腐殖质的形成，缩短了好氧堆肥的成熟时间，因此 T2 的处理期（18 天）比 T1（21 天）短。T1 和 T2 的初始细菌群落有显著差异，但随着堆肥的进行，它们变得相似。经济可行性分析表明，使用 T2 方法，1000 千克 KWSR 可产生 285 元人民币的利润，高于 T1 方法（36 元人民币）。本研究的结果为 KWSR 的管理提供了一种改进策略。

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Waste Disposal & Sustainable Energy

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