| In accordance with the National Hazardous Wastes Catalogue, waste mineral oil includes waste engine oil used diesel oil waste gasoline waste crude oils waste hydraulic oil waste vacuum pump oil waste heat treatment oil waste camphor oil and some other mineral oil-based lubricants which loss of the original function of the oil. Waste mineral oil is classified as toxic substance and number as HW08 in National Hazardous Wastes Catalogue. Its mainly oil sludge and oil foot from mining and refining of oil and sediment from oil Storage as long as oil from replacing and cleanout in facility of machine motivity or transportation. Several toxic substance found in waste mineral oil, so waste mineral oil is being administrated as hazardous waste. Some of those toxic substance is additives in fresh oil, and other is the reaction products of the fresh oil occur chemical change during using process.Petroleum is very important to national economy, sometimes called as the blood of industry. And it is used in industrial production and transportation and almost all fields of national economy. The yield coefficient of waste oil in industrial production and transportation is between 0.1 and 0.8. The number of an estimation of waste oil only from transportation in 2006 is up to 10692 thousand ton. The number of waste oil is growing fast along with the economy developing. A quite number of waste oil is illegal disposed because of out of the eyes of environment protection departments or because of people lack of consciousness in environmental protection. A case of those illegal disposal is landfill with municipal solid waste. And it will be hazardous to the health of people. The previous studies nearly are qualitative description. There is no quantitative assessment to this hazardousness or this environmental risk.Screening out four primary pollutants by analysis and testing 30 waste oil samples are lead zinc polycyclic aromatic hydrocarbons (PAHs) benzene. And their average concentration is respectively 121.9 mg/kg 208.5 mg/kg 4.1% and 0.7%.In this study, start with the storage link of waste oil. as long as transportation link and disposal link. Conduct a risk analysis using DOW chemical fire & explosion assessment for 10 tons waste oil single storage in a typical factory. And the quantitative result of fie &explosion hazardous index is 13, the influence scope of the fire risk is just 10.92 meter. In transportation link, we study two possibilities respectively, one is leak and the other is fire after leak. We predict the human health using surface water module in the case of drinking surface water which is polluted by leaking waste oil. The results show that the human health carcinogenic risk of PAHs and benzene from drinking water is 3.46×10-5 and 2.35×10-8 respectively, the carcinogenic risk from PAHs is the primary risk sources. While in the case of waste oil firing after leak, we account the risk of the whole route into three sections. And we use pool fire module. The results show that the maximum risk of the three sections is 6.2×10-5 which exceeds the threshold of human health risk. To the disposal link, we take a typical scene of a landfill site of municipal solid waste in Chongqing city. And assume that the quantity of waste oil which co-disposes with municipal solid waste in the landfill is 50 tons. We use 3MRA risk assessment module to predict the amount of pollutants which enter air by volatilization and particulate emission in the surface of landfill. Also the amount of pollution which infiltrate into vadose zone and aquifer by infiltrating along with leachate. And the prediction show that the average concentration of Pb Zn PAHs benzene in the air round the landfill 2.5 kilometers is 7.73×10-3 mg/m3,5.99×10-2 mg/m3,2.09×10-4 mg/m3 1.34×10-2 mg/m3, and the average concentration of Pb Zn PAHs benzene in the drinking groundwater is 3.40×10-2 mg/L,3.32 mg/L,2.61×10-4 mg/L,8.07×l0-2mg/L.Using exposure module predict the average human exposure dose of Pb,Zn,PAHs benzene in drinking groundwater and inhalation air. Show that the average human exposure dose of Pb PAHs benzene which are carcinogen to human health during lifetime in drinking groundwater is 3.59×10-4 mg/kg·d,2.75×l0-6mg/kg·d8.52×10-4mg/kg·d respectively, and in inhalation air is 5.40×10-4 mg/kg·d 1.47×10-5 mg/kg·d,9.41×10-4 mg/kg·d respectively. And the average human exposure dose of Zn which is no-carcinogen during exposure period in drinking groundwater and inhalation air is 1.02×10-1 mg/kg·d and 1.23×10-2 mg/kg·d respectively.According to the exposure dose of four pollutants in drinking water and inhalation air, make a estimation of carcinogenic risk and non- carcinogenic risk using risk characterization module of human health for human settling around the landfill. Results show that human carcinogenic risk and non- carcinogenic risk is 9.56×10-7 and 3.41×10-3 respectively. The carcinogenic risk is slightly low than the threshold value acceptable, and the non-carcinogenic risk is also less than 1. |
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