System-based Assessment for Siting a Hazardous Waste Treatment Facility
|關鍵字:||有害廢棄物;場址評估;系統效益評估;危害度;指標;永續環境系統分析;hazardous waste;site assessment;system benefit assessment;hazard level;index;sustainable environmental systems analysis|
Assessing a prospective hazardous waste treatment facility (HWTF) site generally considers only the impact on its surrounding environment, residents, and related factors or conditions. However, a new facility can significantly affect also the collection and distribution of hazardous wastes, and thus the potential risk posed on the entire system may be significantly altered too. No method is currently available for assessing the effect of a new facility on the entire system. This study is thus initiated to establish a method for estimating the system benefit of a new site by analyzing three essential factors. The proposed method is expected to improve the assessment of a candidate HWTF site. First, this study implements the conventional assessment based on several environmental, sociocultural, and economic factors for candidate sites. The proposed method is then applied to analyze spatial, hazard, and transportation risk factors. The spatial factor is evaluated according to the quantities of hazardous wastes transported and treated inside or outside a collection zone. The hazard factor is evaluated based on the NFPA hazard rank values of major representative chemicals of hazardous wastes, and several indexes are established to determine potential hazard levels. The transportation risk is estimated based on the transportation distance, population along passed roads, and the accidental rates of the roads. Then, the system benefit of a new site is estimated according to the three factors. Finally, the suitability of a candidate site is evaluated according to the results of the conventional site assessment and its system benefit. The established method is applied to assess several prospective sites and their system benefits. For each prospective site, hazardous wastes are redistributed based on the Shortest Distance approach and Gravitation approach. The applicability of the method for improving the site assessment of a HWTF site is demonstrated. According to the results, the traditional site assessment is easy to overlook how a new site affects the entire system. Other than assessing the suitability of a HWTF site, the method can be used to improve the quality of decision for selecting a new site. According to the cases implemented for both single and multiple category hazardous waste, the proposed method can facilitate the siting analysis to effectively identify the appropriate candidate site.
|Appears in Collections:||Thesis|