The Evaluation of Food Waste Recycling Strategies In Taipei City
Date Issued
2005
Date
2005
Author(s)
Tsai, Kun-Tsang
DOI
zh-TW
Abstract
The food waste scrap takes approximately 20 to 30% of the total garbage amount; in the past, most of them would be delivered to an incineration plant or landfill facilities for disposal, which was quite a pity. In order to be the top city of “resource recycling” and achieve the missionary goal of “complete recycling and zero garbage landfilled by year 2010”, the Taipei City had on 26th December 2003 promoted recycling of food waste scraps from households. At present, the food waste scraps are divided into “uncooked food waste scraps” and “cooked food waste scraps” for recycling. The uncooked food waste scraps were assigned to private companies for processing by means of compost; the cooked food waste scraps were sold to pig owners for feed and anaerobic digestion was further planned for processing in the future. The objective of this research was to firstly discuss the result of Taipei City Government’s 2004 promotion on household food waste scrap recycling and the reaction from citizens, as well as source, amount and flow direction of food waste scraps in Taipei City. Further analysis was carried out on the benefit from “environmental aspects” and “economic aspects” for proposal of processing food waste scraps in Taipei City with an incineration, landfilling, pig feeding, composting and anaerobic digestion.
From the collecting information, discussion on documents, telephone interviews and visits to the industry, this research summarized and analyzed results after the 2004 promotion on household food waste scrap recycling, the citizen’s level of acceptance, source, amount and flow direction of food waste scraps in Taipei City, costs, benefits and cost-benefit ratio of processing food waste scraps in Taipei City with incineration, landfilling, pig feeding, composting and anaerobic digestion. In addition, this research applied the method of life cycle evaluation to analyze the environmental impact from processing food waste scraps in Taipei City with incineration, landfilling, pig feeding, composting and anaerobic digestion for Taipei City Government’s reference on continuous promotion of food waste scrap recycling and reuse.
The result of the research revealed that the amount of 2004 food waste scraps recycled in Taipei City was already on average of 115 tons per day. The survey showed that more than 80% of citizens agreed and were willing to cooperate with Taipei City Government’s promotion on household food waste scrap recycling. However, statistics also showed that more than 50% of food waste scraps from households were still processed with incineration in 2004; hence the Taipei City Government had to face and discuss the question of how to effectively improve the rate of recycling in the future. The 2004 statistical result for the amount of food waste scraps produced in Taipei City revealed that households produced the most amount of food waste scraps, which was followed by markets and then restaurants. Schools produced the least amount of food waste scraps. Furthermore, the analytic result in this research for costs and benefits in “economical aspects” showed that: pig feeding <composting < anaerobic digestion < incineration < landfilling . If we looked from the case where Belgium applied anaerobic digestion to process food waste scraps with the certification system of the green power program to raise revenue from power sales, the cost-benefit ratio would be greater than pig feeding. From the “environmental aspect”, pig feeding > anaerobic digestion > incineration > composting > landfilling . Therefore, by compiling the above-mentioned analytic results in “economical” and “environmental” aspects, it was known that pig feeding with food waste scraps was the method with high economical benefit and low environmental impact. However, if food waste scraps are prohibited for pig feeding in the future for epidemic prevention, anaerobic digestion can be another method of processing food waste scraps for Taipei City Government’s reference.
Subjects
廚餘
養豬
堆肥
厭氧醱酵
food waste
pig feeding
composting
anaerobic digestion
Type
thesis
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