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A proposed framework of food waste collection and recycling for renewable biogas fuel production in Hong Kong

机译：为香港可再生沼气燃料生产提供食物垃圾收集和回收的拟议框架

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Hong Kong is experiencing a pressing need for food waste management. Currently, approximately 3600 tonnes of food waste are disposed of at landfills in Hong Kong daily. The landfills in Hong Kong are expected to be exhausted by 2020. In the long run, unavoidable food waste should be sorted out from the other municipal solid waste (MSW) and then valorized into valuable resources. A simple sorting process involving less behavioural change of residents is, therefore, of paramount importance in order to encourage residents to sort the food waste from other MSW. In this paper, a sustainable framework of food waste collection and recycling for renewable biogas fuel production is proposed. For an efficient separation and collection system, an optic bag (i.e. green bag) can be used to pack the food waste, while the residual MSW can be packed in a common plastic bag. All the wastes are then sent to the refuse transfer stations in the conventional way (i.e. refuse collection vehicles). At the refuse transfer stations, the food waste is separated from the residual MSW using optic sensors which recognize the colours of the bags. The food waste in the optic bags is then delivered to the proposed Organic Waste Treatment Facilities, in which biogas is generated following the anaerobic digestion technology. The biogas can be further upgraded via gas upgrading units to a quality suitable for use as a vehicle biogas fuel. The use of biogas fuel from food waste has been widely practiced by some countries such as Sweden, France, and Norway. Hopefully, the proposed framework can provide the epitome of the waste-to-wealth concept for the sustainable collection and recycling of food waste in Hong Kong.
机译：香港现正急切需要管理厨余。目前，每天在香港的堆填区弃置约3600吨厨余。预计香港的堆填区将在2020年耗尽。长远而言，应将不可避免的食物废物与其他城市固体废物（MSW）进行分类，然后转化为有价值的资源。因此，为了鼓励居民对其他生活垃圾中的食物垃圾进行分类，一个涉及居民行为改变较少的简单分类过程至关重要。本文提出了可再生沼气燃料生产的食物垃圾收集和回收的可持续框架。为了实现有效的分离和收集系统，可以使用光学袋（即绿色袋）包装食物残渣，而将剩余的城市固体废弃物包装在普通的塑料袋中。然后将所有废物以常规方式（即垃圾收集车）送到垃圾转运站。在垃圾转运站，使用识别袋子颜色的光学传感器将食物残渣与残留的MSW分离。然后，将光学袋中的食物废物输送到拟议的有机废物处理设施，在其中采用厌氧消化技术产生沼气。沼气可通过气体提升装置进一步提升到适合用作车辆沼气燃料的质量。瑞典，法国和挪威等一些国家已经广泛使用了食物垃圾中的沼气燃料。希望所提出的框架能够为香港实现食物垃圾的可持续收集和再循环提供“废物转化为财富”概念的缩影。

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