Research On Ranking And Setting Priority To Coking Pollutants In Terms Of Toxicity Based On USEtox

Owing the privilege of large coal reserve, Shanxi is the biggest coke producingprovince in China, taking coking as pillar industry. However, coking industry is awell-known source of toxic pollutants, most of which have adverse effects on humanhealth and ecosystem. Therefore, to establish a systematic method to compare, screenand finally give priority to those pollutants which contribute most to the adverse effecton human health and ecosystem is the most effective way of toxic management.A field research and sampling project is conducted in coke plant in Shanxi so as tocomplete the coke emission inventory. The USEtox, a consensus model representingrecommended practice in LCIA characterization, is applied to the emission inventory toquantify the potential toxicity impacts of emerging pollutants. A rank list of emissiontoxicity score is obtained and priority pollutants are identified. In addition, priorityproduction procedures and influence of plant site to the toxic impact are analyzed.Benzo(a)pyrene, benzene, Zn and As are identified as the priority pollutants inhuman toxicity; pyrene and anthracene in ecotoxicity. Organics and metals have distincttoxic performance in four production procedures. Coal charging is the dominantprocedure for organic toxicity and priority pollutants include Benzo(a)pyrene, benzene,naphthalene, etc. While coke drenching is the dominant procedure for metal toxicity andpriority pollutants include Zn, As, Ti, Hg etc. Plant site is essential to the toxic impact.Emission to rural environment can reduce the organic toxicity significantly by82%compare to emission to urban environment. However, the site changing has no effect onmetal toxicity and might increase the risk of the metal pollution to rural water and soil.Thesis expands the approach to province scale and Lin fen, Lv liang, Tai yuan,Chang zhi, Yun cheng and Jin zhong are identified as priority cities threatened by thecoking toxic pollutants For coking intensive areas, such as Xiao yi, Hong dong, Tun liu,are identified as priority areas. Conclusions of the thesis are of reference value to toxicmanagement, pollution control and policy making.