摘要
生物干化是城市有机废弃物减量化的一种重要处理手段,但由于传统生物干化处理周期长、脱水效率低、运行温度不稳定,较难适应垃圾分类后巨量的餐厨垃圾处理需求。以餐厨垃圾和锯末作为原料,基于跟随辅热(T_(1))、连续50℃辅热(T_(2))、阶段50℃辅热(T_(3))等辅热模式,研究不同辅热策略对餐厨垃圾生物干化过程含水率(moisture content,MC)、种子发芽率(seed germination rate,GI)、挥发性固体(volatile solids,VS)、质量损失、能耗等指标的影响。结果表明:外源辅热显著影响生物干化效率,辅热处理T1、T2、T3的温度综合指数分别为:639.8、632.9、621.8℃,比对照组(T-CK)(无外热源)相对提高了42.15%、40.61%和38.15%;水分去除率分别为:78.42%、80.33%、77.86%,比对照组相对提高了51.27%、54.96%、50.19%。跟随辅热处理的有助于堆体维持高温、物料减重和产品腐熟,且能耗较低,适用于后续堆肥资源化利用;连续辅热处理的水分去除率和单位有机物降解脱水能力最高,有机质降解率、全碳、全氮损失率最低,有助于对物料脱水,但能耗较高且经过15 d的生物干化堆体未达到腐熟标准,适用于后续焚烧处理。
Bio-drying is an important treatment for the reduction of urban organic waste.However,due to the long processing cycle、low dehydration efficiency and unstable operating temperature of traditional bio-drying,It is difficult to adapt to the huge amount of food waste disposal needs after garbage classification.Food waste and sawdust were used as raw materials.Based on different thermal assist strategies such as following thermal assist(T_(1))、continuous 50℃thermal assist(T_(2)),and stage 50℃thermal assist(T_(3))to study the influence of different thermal assist strategies on the moisture content(MC),seed germination rate(GI),volatile solids(VS),quality loss,energy consumption,and other indicators of the bio-drying process of food waste.The results show that the thermal assist strategies can significantly affect the bio-drying efficiency.The temperature integration indexes of the three groups of thermal assist treatment(T1,T2,T3)are respectively:639.8,632.9,621.8℃,which are 42.15%,40.61%and 38.15%relative higher than the control group(T-CK).Moisture removal rates are 78.42%,80.33%,and 77.86%,which are 51.27%,54.96%,and 50.19%relative higher than the control group(no external heating source).Following thermal assist treatment helps to maintain the high temperature of the pile,reduce the weight of the material and the product decomposes,and has low energy consumption,which is suitable for the subsequent utilization of composting resources.The continuous thermal assist treatment has the highest water removal rate,unit organic matter degradation and dehydration capacity,and the lowest organic matter degradation rate、total carbon and total nitrogen loss rate,which is helpful for dewatering the material,but the energy consumption is higher and after 15 d bio-drying pile does not up to the maturity standard,which is suitable for subsequent incineration treatment.
作者
范鑫祺
陈睿
李琬婷
詹亚斌
孙宝茹
魏雨泉
李季
FAN Xin-qi;CHEN Rui;LI Wan-ting;ZHAN Ya-bin;SUN Bao-ru;WEI Yu-quan;LI Ji(College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;Organic Recycling Research Institute (Suzhou) of China Agricultural University, Suzhou 215100, China)
出处
《科学技术与工程》
北大核心
2021年第36期15688-15694,共7页
Science Technology and Engineering
基金
国家重点研发计划(2016YFD0800601)。
关键词
餐厨垃圾
生物干化
辅热策略
脱水效率
food waste
bio-drying
thermal assist strategies
dehydration efficiency
