某石化企业废水处理站VOCs排放量估算及自厂排放系数研究

发布时间：2018-03-21 21:09

本文选题：废水处理站　切入点：VOCs排放量　出处：《中国矿业大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着我国经济的迅速发展,大气污染问题日益严重,雾霾天气频繁出现,挥发性有机物(VOCs)作为雾霾的重要前体物受到广泛关注,成为我国“十三五”大气污染防治的重点污染物。石化行业作为重要的工业污染源,其废水环节污染物成分复杂,VOCs的去除既有物理挥发作用也存在生物化学反应,所以废水环节的VOCs排放量估算是一个难题,本研究利用WATER9模型法对某石化企业的废水处理站VOCs排放量进行估算,估算后结合实测结果对模型法进行优化,同时探讨研究适用于我国自厂排放系数建立规程,得出以下结论:(1)利用WATER9模型对废水处理站10套废水处理装置的VOCs排放量进行估算,在不考虑加盖的情况下,企业废水处理站VOCs排放总量为2158.97t/a,其中1#废水处理装置、2#废水处理装置、含油废水处理装置和氧化废水处理站排放量最多,占99%以上;带有曝气或搅拌装置的废水池VOCs排放量较高,二沉池排放量较低;(2)结合实测结果对WATER9模型计算过程进行优化,主要对调节池和曝气传质系数进行优化,企业废水处理站优化后VOCs排放量为1179.98t/a,优化后估算结果与实测结果的相对误差在±7%范围内,比无修正情况下误差较小,修正可信;(3)计算出该企业各废水处理装置的排放系数在0.001~0.239kg/m3范围内,根据该企业废水处理站运行现状,得出该企业的自厂排放系数为0.021 kg/m3。
[Abstract]:In recent years, with the rapid development of China's economy, the problem of air pollution is becoming more and more serious, haze weather frequently appears, volatile organic compounds (VOCs) as an important precursor of haze has received extensive attention. Petrochemical industry, as an important source of industrial pollution, has not only physical volatilization but also biochemical reaction in the removal of VOCs from wastewater. Therefore, the estimation of VOCs emission from wastewater is a difficult problem. In this paper, the WATER9 model method is used to estimate the VOCs emission from wastewater treatment plant in a petrochemical enterprise, and the model method is optimized by combining the measured results with the estimation. At the same time, this paper discusses the rules for establishing discharge coefficient of domestic wastewater treatment plants, and draws the following conclusion: (1) using WATER9 model to estimate the VOCs emissions of 10 wastewater treatment plants in wastewater treatment stations, without considering the capping, The total amount of VOCs discharged from the wastewater treatment station is 2158.97 t / a, among which, the wastewater treatment unit of 1#, the oily wastewater treatment unit and the oxidation wastewater treatment station have the most discharge, accounting for more than 99%. The VOCs emission of wastewater tank with aeration or mixing unit is higher, the discharge of secondary settling tank is lower than that of secondary settling tank. The calculation process of WATER9 model is optimized by combining the measured results, and the mass transfer coefficients of regulating tank and aeration are optimized. The optimized VOCs discharge of waste water treatment station is 1179.98 t / a. The relative error between the estimated result and the measured result is within 卤7%, which is smaller than that in the case of no correction. The discharge coefficient of each wastewater treatment plant in this enterprise is calculated in the range of 0.001~0.239kg/m3. According to the operation status of the wastewater treatment station in this enterprise, the discharge coefficient of the plant is 0.021 kg / m ~ (3).
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X78

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