重慶地區(qū)有機化工精餾殘渣污染特性及其環(huán)境風(fēng)險評價
[Abstract]:In the production process of organic chemistry industry, while obtaining useful products or intermediate products by distillation separation technology, most of them also produce a certain amount of residue or residual liquid in the tower kettle, which often contains more impurities and toxic and harmful substances. In China, hazardous waste management is often referred to as distillation residue (HW11). With the development of organic chemical industry and the improvement of refining rate, the amount of distillation residue is also increasing, but at present, there is still a lack of systematic research on distillation residue in China, and the control measures are still very weak. Therefore, it is of great significance to investigate typical organic chemical enterprises, deeply analyze the production and pollution characteristics of distillation residue, and analyze its components, and then carry out the health risk assessment of residue. On the basis of summing up the research results of typical organic chemical enterprises, the paper further analyzes the residue samples collected. The residue of distillation is mostly viscous tar liquid or solid, and the composition is complex. The main pollutants in the residue can be divided into benzene series, polycyclic aromatic hydrocarbons (PAHs), halogenates, heavy metals and other kinds. Using the risk evaluation index system, the five characteristic pollutants in distillation residue were evaluated by linear and exponential scoring methods respectively. The results of two evaluation methods showed that polycyclic aromatic hydrocarbons (PAHs) and benzene series had the highest risk grade. Very high risk level. Environmental pollution risk of heavy Metals in solid Distillation residue was evaluated by using potential Ecological Hazard Index method. The potential ecological risk grade of PTA rectification residue was strong Ni as the main pollution factor. The potential ecological risk index is 474.85, and Ni,Cr,Zn,Cu is a common pollution hazard in distillation residue. The pollutants in residue were divided into non-volatile and volatile pollutants according to different exposure pathways, and the population health risk assessment was carried out respectively. Taking heavy metals as an example, the health risk of non-volatile pollutants in distillate residue was studied. The results showed that the carcinogenic risk of heavy metals in the four kinds of rectified residue was 8.55E-04 ~ 4.91E-04N 4.48E-03N 4.19E-04, respectively. Carcinogenic pollution factors are Cr and As, and As is more carcinogenic than Cr. The number of carcinogens caused by these four residues was calculated to be 38.5% 12.322.4% 25.1 respectively. The health risks of volatile hydrocarbons in distillate residue were studied by taking chlorohydrocarbons with high volatility and toxicity as an example. The results showed that the comprehensive carcinogenic risk values of chlorinated hydrocarbons in the three kinds of distillation residues were 3.62E-05n3.68E-06n9.81E-06respectively. CCl4 and C2HCl3 are the main pollution factors, and the risk contribution rates are 66% and 33% respectively. It is calculated that the number of carcinogens caused by residue pollution is 116U 0.552c11.3 per year. If the production process of methane chloride is optimized, the number of carcinogens per year can be reduced from 116 to 3.
【學(xué)位授予單位】:北京化工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:X783;X82
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