【作者】 韩祯；

【导师】 程文；

【作者基本信息】 西安理工大学 ， 环境工程， 2010， 硕士

【摘要】 随着石油勘探开发及石油化工行业的发展,含石油废水已经成为工业水污染源中较为重要的组成部分。含油废水具有毒性大、COD含量高、可生化性差等特点,对水体、土壤以及动植物健康都有较大危害。鉴于此,寻求一种经济高效、操作简单、管理方便的含油废水处理工艺具有广泛的现实意义。本文针对含石油废水的特点,采用“水解-曝气生物滤池”两段式工艺对陕西某油田经过滤后的含油废水原水进行处理,分别考察了水解段和好氧段的运行效果,确定了两段式工艺的最优工况,并对影响系统运行效果的主要因素进行了深入的试验研究和理论分析。(1)试验研究表明：水解段能够显著改善含油废水的可生化性、有效截留原水中的SS,并且具有较强的抗污染冲击负荷能力,能够为后续好氧段的生物降解提供稳定、良好的进水条件。在保证水力停留为7h条件下,水解池出水的BOD/COD比进水提高了0.18左右、对SS去除率可达80%以上,同时对COD和油的去除率分别可以达到34.5%和23.7%。(2)水力负荷、进水COD浓度、气水比是影响好氧段曝气生物滤池运行效果的重要因素。试验确定了好氧段最佳运行条件为：水力负荷为0.2,气水比为5：1。正交试验确定了各因素影响作用的大小顺序依次为水力负荷、气水比、进水COD浓度。曝气生物滤池不同高度范围的滤料层内污染物降解速度也存在着较大差异,滤柱的前30cm段COD降解效率最高,可以占到总去除率的45.7%。(3)通过对水解段和好氧段不同工况组合条件下出水COD、石油类的监测,确定两段式工艺的HRT为12h,(其中水解段7h,好氧段5h),好氧段气水比为5：1。COD和石油类的去除率可以分别达到94.70%和92.44%,出水COD浓度为36.4-47.1mg/L,石油类浓度为3.47-4.86mg/L,均符合GB8987-1996规定的石化废水一级排放标准。此外,工艺系统在进水油浓度不超过70mg/L时,对进水石油类具有良好的耐受性；在进水中含盐量发生突变时,系统具有较强的抗冲击负荷能力,可以有效的保证出水水质。更多还原

【Abstract】 As the development of oil prospecting and petroleum chemical industry, oil wastewater has been one of the most important industrial pollution source. Oil wastewater has some characteristics such as high toxicity, high COD and weak biodegradability and it is harmful for the water environment, soil and the health of animals and plants. In order to solve these problems, it is widely significant to seeking for a technique which is effective feasibility, credible economy, convenient for management.In this paper, with respect to some characteristics of oil wastewater above mentioned, the "HOBAF" two stages type system which means the combination of Hydrolyzing and Acidification reactor, and the Biological Aerated Filter has been used to treating the oil wastewater after filtration from certain oil field of Shanxi. The running behavior of hydrolysis stage and aerobic stage was inspected respectively. At the same time, the most optimum operating condition was determined and the main factors affecting the running behavior of the systems were studied thoroughly by experimental investigation and theoretical analysis.The main results in this paper are listed as follows:(1) It is demonstrated that by the experimental results, as pretreatment device, the hydrolysis stage can enhance the biodegradability of oil wastewater significantly, intercepting SS of the influent, and it can resist the shock loading and provide stable water quality to aerobic stage. When the HRT of the two stages type system is kept in 7 hours, the BOD/COD of effluent of hydrolysis increased from 0.24 to 0.43 averagely, the SS removal rate can reach 80%. Besides, hydrolysis stage has certain contribution to the removal of oil and COD. On this condition above mentioned, removal rate of oil and COD can reach 23.7% and 34.5% respectively.(2) Hydraulic loadings, influent COD concentration and g/w ratio were leading factors affecting the running behavior of the BAR By the experiment, the optimum operating condition was be determined as follows:hydraulic loading is 0.2m3/m2.h, g/w ratio is 5:1. The ranking order of these leading factors was determined by orthogonal experiment as follows:hydraulic loading, g/w ratio and influent COD concentration. On the optimum operating condition, pollutants removal rate of different range of height layer of BAF is differ from one another. In the scope of the first 30cm of filter, the efficiency of COD removal rate is at the peak and the rate of the degradation is the fastest of the whole filter, accounting for 45.7% of the total removal rate.(3) It can be determined by the COD and petroleum types rate under combination of different operating condition that the most optimum parameters of two stages type system is HRT=12h,(hydrolysis stage is kept in 7h, aerobic stage is kept in 5h), the g/w ratio of aerobic is 5:1.On this condition, removal rate of COD and petroleum type can reach 94.7% and 92.44% respectively, effluent COD concentration is in the scope of 36.4-47.1mg/L, effluent petroleum type is in the scope of 3.47-4.86 mg/L, both of two can satisfy the request of the first grade standard about oil wastewater of GB8987-1996. In addition, when the influent oil is not exceeding 70mg/L, the two stages type system has good tolerance to the petroleum type. Meanwhile, the two stages type system has excellent ability to resist shock loading formed by sudden change of salinity, then the system can ensure the effluent water quality effectively.更多还原