Assessing Greenhouse Gas Emissions and Energy Efficiency of Four Treatment Methods for Sustainable Food Waste Management

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Recycling Pub Date : 2023-08-27 DOI:10.3390/recycling8050066
Xiaoming Liu, Si Li, Wenhao Chen, Huizhou Yuan, Yiguan Ma, Muhammad Ahmar Siddiqui, Asad Iqbal
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引用次数: 1

Abstract

Food waste (FW) increases with urbanization and population growth, which puts pressure on the treatment system, causing a variety of harmful impacts on the environment. Proper FW treatment is imperative for ecological integrity and public health. Even though FW treatment is an extensively studied topic, the sustainable FW treatment considering holistic-lifecycle-based environmental impacts has rarely been evaluated. This study addresses this gap through a comprehensive analysis of various FW treatment methods, including co-treatment with sewage, anaerobic digestion, incineration, and aerobic composting. The impacts of greenhouse gas (GHG) emission and energy use efficiency are assessed by analyzing diverse FW treatment methods in Shenzhen, China. The study indicates that FW addition to sewage does not adversely affect the current sewage treatment plant, but benefits GHG avoidance and energy recovery. Compared with the other FW treatment methods, FW anaerobic digestion avoids the most GHG emissions with −71.3 kg CO2 eq/FU and recovers the most energy with −223 kWh/FU, followed by FW co-treated with sewage. The energy conversion efficiency of the combined heat and power (CHP) unit greatly affects FW incineration, while energy consumption in incineration and anaerobic digestion (AD) process is relatively minor. Perturbation analysis pinpoints key parameters influencing outcomes, including CHP efficiency, GHG emission factor of local electricity, and chemical oxygen demand (COD) in FW with ratios of −13~−0.942, −0.518~0.22, and −13~1.01, respectively, that should be given special attention. This study sheds light on sustainable FW management strategies, not only in China but also transferrable to regions confronting similar challenges. Advocating ecologically balanced and resource-efficient approaches, the study aligns with broader aims of fostering sustainable development.
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评估可持续食物垃圾管理的四种处理方法的温室气体排放和能源效率
食物垃圾(FW)随着城市化和人口增长而增加,这给处理系统带来了压力,对环境造成了各种有害影响。适当的FW处理对生态完整性和公众健康至关重要。尽管FW处理是一个广泛研究的主题,但考虑到基于生命周期的整体环境影响的可持续FW处理很少得到评估。本研究通过对各种FW处理方法的综合分析,解决了这一差距,包括与污水共处理、厌氧消化、焚烧和好氧堆肥。通过对深圳市不同FW处理方法的分析,评估了温室气体排放和能源利用效率的影响。研究表明,在污水中添加FW不会对目前的污水处理厂产生不利影响,但有利于避免温室气体排放和能源回收。与其他FW处理方法相比,FW厌氧消化以−71.3 kg CO2 eq/FU避免了最多的GHG排放,并以−223 kWh/FU回收了最多的能量,其次是与污水共同处理的FW。热电联产(CHP)机组的能量转换效率对FW焚烧的影响很大,而焚烧和厌氧消化(AD)过程的能耗相对较小。扰动分析确定了影响结果的关键参数,包括CHP效率、当地电力的GHG排放因子和FW中的化学需氧量(COD),其比值分别为−13~−0.942、−0.518~0.22和−13~1.01,应特别注意。本研究揭示了可持续FW管理策略,不仅在中国,而且可以转移到面临类似挑战的地区。该研究倡导生态平衡和资源高效的方法,符合促进可持续发展的更广泛目标。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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