廃棄物資源回収によるCO_2排出削減効果とごみ集積所の計画ごみのリサイクルと分別を考慮した事務所建物のごみ集積所に関する調査研究（その3）

摘要

1．はじめに循環型社会を促進する上では、廃棄物の排出が抑制され、適正な循環的利用を促進し、且つ循環資源の適正処理により天然資源の消費を抑制し環境への負荷を低減することが肝要である。資源回収の具体的な実施要領は、廃棄物の再資源化による環境負荷の低減効果が定量的に把握されていることが望ましいが、それらを評価する汎用的な手法は充分に整理されていない。%This report presents calculations of the CO_2 emissions during the transportation and processing of each class of recyclable materials recovered from waste of the operations in an office building.' Emissions were shown to correlate with the rate of resource recovery from municipal solid wastes, and areas of waste collection points in buildings needed in order to recover resources were estimated. The findings are as follows. 1) Great variation was seen in the actual values of the rate of resource recovery due to variations in how the wastes were generated and in the methods of separation and recovery used in the buildings, but the mean of the rate of resource recovery in the surveyed buildings was approximately 60%. 2) Comparing with the volume of generated wastes for each class of recovered materials between before and after promulgation of the Basic Act on Establishing a sound Material Cycle Society indicated a tendency for the enforcement of these laws to suppress the volumes of each class. 3) When the actual resource recovery of wastes from the monitored buildings reached about 60%, the CO_2 emissions due to transportation and processing were estimated to be equivalent to the reduction in CO_2 emissions during the resource recovery.4) Targets were set for waste collection point area ratios of 0.4% and 0.35% for property areas up to 30,000 m2 and 50,000 m2, respectively to make it convenient to recover resources. These were roughly equal to the ratios found in the buildings surveyed. About 0.8% was estimated to be needed in property areas of 10,000 m2 or less. These findings suggest that the current standard was set by the municipalities regulation is too small.