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( Yasushi Matsufuji ),( Ayako Tachifuji ),( Makiko Tanaka ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
최근에 소각장은 다이옥신 최소배출가스를 고비용으로 처리하고 있다. 그러므로 지방정부는 플라스틱 소각장 대신에 경제적인 또한 안전한 처리체계가 필요하다. 이 연구는 생분해 플라스틱을 포함한 도시고형폐기물을 플라스틱에서 생분해플라스틱(BP)으로 대부분 전환한 후 매립지로 처분한 경우 이것의 해결책과 문제를 제기한다. 이 결과로부터 (1)BP의 증가로 매립지의 오염부하 (2) 이문제는 준호기성 매립형태와 예를들면 PLA로서 BP 가스화로서 해결한다. Recently, the incineration plant was integrated to satisfy the limit levels of Dioxins in emission and get more expensive. Therefore local government needs an economical and safety treatment system instead of incinerating waste plastics. This study provides the problems and its solutions in case that municipal solid waste including biodegradable plastics (BP) was disposed of in landfill after converting most of plastics to BP. From this result, it was clarified (i) the pollutant load in landfill increase by receiving BP, (ii) this problem is solved by selecting the semiaerobic landfill type and BP with high in gasification rate such as PLA.
Applicability of R2A-DNB Index to Landfill Stabilization Indicator
( Noriko Ishibashi ),( Yasushi Matsufuji ),( Ayako Tachifuji ),( Hiromi Sawamura ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
The stabilization of landfills is important for reducing the potential risk of environmental pollution by the leachate. To evaluate the stabilization of landfills, Koikawa et al. focused on bacteria being decomposer of wastes and proposed the application of DNB index which indicates the dominance of oligotrophic bacteria (DNB bacteria), meaning the value divided DNB bacteria number by total bacteria number in 1992. This index has the potential to underestimate the dominance of DNB bacteria, because the total number calculated by the addition of DNB bacteria number to heterotrophic bacteria (NB bacteria) number is likely to doubly count the number of facultive oligotrophic bacteria. Therefore, in this study the applicability of modified DNB index (R2A-DNB index), in which the viable count in R2A medium is used as the total bacteria number, was evaluated by analyzing the relationship between this index and the concentration of pollutants. In general, the growth of DNB bacteria is affected by Cl⁻ concentration as well as nutrient concentration. At first, the eight leachate samples collected from Ky, Hi, Sh and Bf landfills (Table 1), having no inhibition of Cl⁻ (lower Cl⁻ concentration than 300mg/L), was selected from 30 leachate samples (11 landfills) provided for this study. The relation coefficient between R2A-DNB index (R<sup>2</sup> = 0.42) and BOD concentration was higher than that of DNB index (R<sup>2</sup> = 0.09), although there was a weak negative correlation in both index as shown in Figure 1. From these results, it seems that the R2A-DNB index is effective as an evaluation index for the stabilization of landfill compared with DNB index.