Externalities of Fugitive Dust

It is known that fugitive dust can cause human health and environmental problems, alone or in combination with other air pollutants. These problems are referred to as ‘external costs’ that have been traditionally ignored. However, there is a growing interest towards quantifying externalities to assist policy and decision-making. With this in mind, the present study aimed at discussing the environmental regulations that deal with fugitive dust, the impact of fugitive dust on human health and global climate system, and the available methods for calculating fugitive dust externalities. The damage cost associated with human health and global environmental problems was predicted based on the environmental strategy priority model. The damage cost estimated by the model ranged from 40 to 374 EUR/kg of emitted fugitive dust with a mean value of 120 EUR/kg of emitted fugitive dust. It was also found that PM_2.5 and PM₁₀ have contributed to about 60% and 36% of the estimated damage cost, respectively. The remaining 4% was attributed to both nitrate and sulfate aerosols.     

美国环境健康损害赔偿立法及其对我国的启示

美国尚未制定专门的环境健康损害赔偿立法。由环境保护法律中的相关规定、涉及环境侵权赔偿或者补偿的相关立法以及环境健康损害赔偿典型判例构成的法规体系,为环境健康保护提供了重要的法律依据。从《超级基金法》、《詹姆斯.扎德加9.11健康与赔偿法案》、《联邦侵权赔偿法》和《联邦雇员补偿法》等立法以及Sterling诉Velsicol化学公司案、普莱斯诉美国海军案等判例中总结的美国经验主要包括:适时制定专门立法;建立损害赔偿社会化机制;适用惩罚性赔偿机制;科学确定赔偿范围和数额;明确公职人员的法律责任。我国应当基于自身国情,充分借鉴美国的成熟经验,加快环境健康损害赔偿立法进程。     

The shaped blasting experimental study on damage and crack evolution of high stress coal seam

In the deep high stress coal and rock mass, the efficiency of the ordinary blasting method is constantly affected by the high pressure. This study investigates the shaped blasting technology with increased blasting efficiency, develops a mechanical model for coal crack expansion during shaped blasting, and examines the force-energy action of energy-gathering jets during coal splitting. The established model was combined with experiments and simulations to reveal the damage and evolution of cracks in coal and rock masses. Experiments demonstrate that shaped blasting can create an energy-gathering jet that causes a directional fracture in the test block. The peak of compressive strain in the energy-gathering direction is 1.12 times greater than that of ordinary blasting, and the static action period of the explosive gas is prolonged by 1.3 μs according to the stress curve. Moreover, the peak pressure strain increased 3.2 times, and the pull strain peak increased 3.92 times. The damage amount was represented by the resistivity and ultrasonic wave speed, and shaped blasting causes 1.2 and 1.5 times greater damage than ordinary blasting. The research results provide technical methods for safe and rapid penetration blasting in deep high-ground stressed coal mines.     

环境污染损害评估个案分析及对策建议

国内环境污染损害评估工作刚刚起步，科学评估环境污染损害数额成为亟需解决的问题。在分析国内环境污染损害赔偿现状的基础上，简述了开展污染损害评估的必要性。结合具体案例阐述了环境污染损害评估的计算方法，提出开展环境污染损害评估工作的建议及措施，包括建立高效的环境污染应急处置机制，开展预防为主的企业清洁生产审核验收和企业环境风险评价，建立终身责任追究、产权责任追究和连带责任追究制度等。