http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ken Kawamoto (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
-
Current State of Construction and Demolition Waste Management in Vietnam
( Han Hoang ),( Tomonori Ishigaki ),( Rieko Kubota ),( Masato Yamada ),( Ken Kawamoto ),( Giang Nguyen ),( Kien Tong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
The construction industry plays an important role in the Vietnamese economy. However, a significant amount of CDW has been generated in association with increasing growth of this industry. CDW accounts for 10-12% of total municipal solid waste generated, equaling about 9,000 tonnes/day in Vietnam (MONRE, 2011). Despite rising CDW related issues, current CDW management activities are not well documented. To date, there are no official statistics of and limited studies on CDW generation and handling practices. To fill this information gap, the overarching aim of this study is to provide better understanding of the overall situation of CDW in Vietnam through: (1) estimating CDW generation rates and CDW composition, and (2) identifying CDW flows. 15 building construction and demolition sites were surveyed during the course of two months. The sites were selected so that they were located in diverse districts in Hanoi and involved different contractors and developers. Three pilot site visits were implemented to identify shortcomings of and revise survey methodology. The following three methods were applied to collect data: ㆍ CDW quantification: waste amount was determined through applying the method developed by Lau, Whyte, and Law (2008). Of which, CDW was categorised and measured according to its layout in order to identify its volume. CDW volume was converted into CDW weight afterwards. ㆍ CDW composition: Image analysis was utilised to identify CDW compositions. Photos of waste stockpiles/ piles were captured and superimposed by 11x11 dot grids to determine waste components. The sum of dots indicates each waste component’s proportion in the stockpiles/piles. ㆍ CDW flow: Face-to-face interviews using semi-structured questionnaires were conducted with site managers and contractors to identify final destinations of CDW and actors involved in CDW flows. Data collected identified that brick and concrete are the main wastes generated in demolition activities whilst soil is dominant in construction ones (Figure 1 and 2). Given that surveyed construction sites are significantly larger than other sites, soil has the most significant share (64.9%) in total waste composition, followed by concrete (20.2%), brick (5.9%) and wood (3.3%). The interviews on the CDW flow revealed that about 33% of CDW is reused and recycled through backfilling at other construction sites (concrete, brick, etc.) or sold to recyclers (wood, metal, plastics, etc.). The rest is disposed either at official CDW landfills (34%) or at unknown/unofficial dumping areas (33%). Current CDW handling practices is solely profit-driven with very limited management of the government. The identified WGRs and composition are beneficial to future studies that estimate the amount of CDW generated nationwide. The study findings on nature of current CDW management system are hoped to lead to better plans or business strategy development for CDW recycling market in Vietnam.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
