Impact of trash bin arrangement preference on real separation efficiency: 4 trash bins case = Impact of trash bin arrangement preference on real separation efficiency: 4 trash bins case
저자
( Nattapon Leeabai ) ; ( Qiuhui Jiang ) ; ( Dilixiati Dilinazi ) ; ( Shinya Suzuki ) ; ( Fumitake Takahashi )
발행기관
학술지명
권호사항
발행연도
2018
작성언어
-주제어
자료형태
학술저널
수록면
531-531(1쪽)
제공처
Waste collection is placed in the initial stage of waste management flow chart and trash bins or trash containers are well-known used took for waste collecting. Although trash bins seem to relate to waste separation efficiency, only a few researches are concerned about the impact of trash bins on waste segregation. Trash bins are designed to encourage waste segregation of recyclable and non-re eye lable wastes in public. Normally, there are four kinds of trash bins set for waste disposers; trash bins for combustible waste (burnable waste; BU), incombustible waste (NC), PET bottles (PE), and cans (CA). A previous study of the authors researched on psychological preferences of trash bins arrangement (Jiang et al. (2017) Proceedings of the 8th China-Japan Joint Conference on material recycling and waste management, 206-209,Hangzhou, 16-20th Sep.). In this study, the authors focus on the impact of four trash bin arrangement preferences, which was quantified by questionnaire surveys, on waste separation efficiency. This study tested the best arrangement preference, median arrangement preference, and the worst arrangement preference to find out the correlation between separation accuracy and trash bin arrangement.
Psychological preferences of trash bin arrangement were scaled by web questionnairs using pairwise comparison method with Thurstone’s law of comparative judgement. Web questionnairs were conducted three times from Jan. to Mar. in 2017 for 210 people. Therefore, a total of 630 data was collected in the previous study. Gender of respondents was balanced equally. The ages of respondents were from 20’s to 60’s and also balanced equally with 10-year interval. Preference scores of totally 24 arrangements of four trash bins are shown in Figure 1 indicating that higer score means higher preference. The best arrangement was, from left to right, BU, NC, PE, and CA respectively. The median arrangement preference was, from left to right, PE, BU, NC, CA respectively. The worst arrangement preference was, from left to right, NC, CA, BU, PE respectively. In this study, 1<sup>st</sup> batch data was collected only for combustible trash bins in the best/worst arrangements for two weeks from Jan. to Mar. in 2018. 2<sup>nd</sup> batch data was collected for each the best/median/worst arrangement for one week in from Mar. to Apr. in 2018. Both experiments perform at Takahashi Lab of Tokyo Institute of Technology.
The data of foreign wastes (weight percentage) was used for comparison. In 1<sup>st</sup> batch, the best arrangement preference 9.79% of wastes was incorrectly disposed to the combustible bin. In the worst one, 10.63% was incorrectly disposed wastes. This data might suggest that the best arrangement had better to encourage disposer to do waste segregation with lower percentage of foreign wastes. However, statistical test suggests that foreign wastes percentage of two trash bin arrangements were not different significantly at 10 % significane level (P = 0.336). In 2<sup>nd</sup> batch for the best/median/worst arrangements, 5.93%,8.71%, and 13.74% of wastes were incorrectly disposed, respectively. In case of incombustible bin, 19.30%,25.57%, and 63.25% of wastes were incorrectly disposed in the best/median/worst the best to the worst arrangement in the same way as 1<sup>st</sup> batch. However, statistical analysis with one-way ANOVA suggests that foreign wastes and combustible waste percentage of three arrangements were not different significantly at 10% significance level (P = 0.151). We concluded that arrangement preference was not effective towards waste separation efficiency for combustible trash bin. Even so, we learned that plastic waste was the majority of foreign wastes at 66.55% in the combustible trash bin. Future study will look on the separation of plastic wastes from combustible waste. For incombustible trash bin, incorrect waste disposal significantly increased from the best to the worst arrangement. One-way ANOVA suggests that foreign wastes and incombustible waste percentage of three arrangements were significantly different at 10% significance level (P = 0.0536).
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