移动床生物膜反应器处理炼油含酚废水工艺研究

发布时间：2018-03-12 17:37

本文选题：移动床生物膜反应器　切入点：挥发酚　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：酚类化合物是一种有毒污染物,对环境和人类有害,某石化公司的汽提净化装置出水(以下统称炼油含酚废水)含酚量较高,酚含量在150 mg/L~250 mg/L之间,直接排放将影响废水生化处理系统稳定运行和废水处理达标排放,按照“污污分流与分治”的工艺设计,本文采用生物新技术对炼油含酚废水进行预处理,自行设计具有内循环功能的移动床生物膜反应器(MBBR),目标使炼油含酚废水的挥发酚平均去除率达80%以上,研究专属微生物(噬酚菌)的培养驯化方法、最佳工艺参数和操作条件,为工业应用提供设计参数和技术参考。完成的主要工作及结论如下:(1)MBBR反应器的设计。该实验装置设计处理规模是500L/h,由两级生物膜反应器与沉淀池构成,采用高性能的聚乙烯填料作为微生物载体,具有内循环功能,大水量的内循环水流既能稀释和混合高浓度的含酚废水,又能强化污染物在水相和生物相之间的传质效率。(2)MBBR反应器的启动。对噬酚菌的培养与驯化将采用静态、动态结合的培养方法,反应器内有大量微生物生成,挥发酚、COD、p H的降解稳定。(3)MBBR反应器运行影响因素研究。考察水力停留时间(HRT)、溶解氧(DO)和酸碱值(p H)对装置运行的影响,最适宜HRT为10h,装置中部废水DO浓度应维持1.0~3.0 mg/L,p H维持7.0~9.0之间,能够保证噬酚菌处于高的生物活性状态。(4)炼油含酚废水可生化性研究。经过两级移动床生物膜反应器处理后,炼油含酚废水的平均BOD5/COD比值由0.45升至0.67,可生化性得到提高,有利于石化厂对出水的进一步处理,证明移动床生物膜反应器对炼油含酚废水有生物降解作用。(5)MBBR反应器两级串联连续运行状况分析。维持进水水量为500L/h,使HRT保持10h,气水比维持在14:1~18:1,保证反应器内的溶解氧充足,装置在最佳运行条件下连续运行28天,两级串联总挥发酚去除率为87.14%,总COD去除率为33.20%,装置连续运行效果稳定,污染物降解效果显著。
[Abstract]:Phenolic compounds are toxic pollutants, which are harmful to the environment and human beings. The effluent of a petrochemical company's stripping purification plant (hereinafter referred to as the wastewater containing phenol in refinery) contains high phenol content, and the phenol content is in the range of 150 mg/L~250 / mg/L. Direct discharge will affect the stable operation of wastewater biochemical treatment system and the discharge standard of wastewater treatment. According to the process design of "decontamination and separation and treatment", a new biological technology is used to pretreat the wastewater containing phenol in oil refining. A moving-bed biofilm reactor with internal circulation function was designed to achieve an average removal rate of 80% or more of volatile phenol in the wastewater from oil refining. The culture and acclimation method, the optimum technological parameters and the operating conditions of the specialized microorganism (Phenophagobacteria) were studied. The main work and conclusions are as follows: 1. The design of MBBR reactor. The designed treatment scale of the device is 500L / h, which consists of a two-stage biofilm reactor and a sedimentation tank. High performance polyethylene filler is used as microorganism carrier, which has the function of internal circulation. The internal circulating water with large amount of water can not only dilute and mix the high concentration phenol wastewater, but also has the function of internal circulation. It can also enhance the mass transfer efficiency of pollutants between water phase and biological phase. The start-up of MBBR reactor. The culture and acclimation of phenolic bacteria will be carried out by static and dynamic combination, and a large number of microorganisms will be produced in the reactor. Study on the influencing factors of the degradation Stability of volatile Phenol (CODN) H. The effect of HRT (do) and pH value (pH) on the operation of MBBR reactor was investigated, and the effect of HRT (do) and pH value (pH) on the operation of MBBR reactor was investigated. The optimum HRT is 10 h, and the concentration of do in the wastewater of the middle part of the plant should be kept between 1.0 ~ 3.0 mg / L 路L ~ (-1) H, which can guarantee the biodegradability of phenolic bacteria in a high bioactivity state. The biodegradability of phenol-containing wastewater is studied. After two-stage moving bed biofilm reactor, the biodegradability of phenolic wastewater can be ensured by a two-stage moving bed biofilm reactor. The average BOD5/COD ratio of phenol wastewater increased from 0.45 to 0.67, and the biodegradability was improved, which was beneficial to the further treatment of effluent from petrochemical plants. It is proved that the moving bed biofilm reactor has biodegradable effect on the wastewater containing phenol in refinery. The two-stage continuous operation of the two-stage MBBR reactor is analyzed. The HRT is maintained at 500L / h, and the gas-water ratio is kept at 14: 1: 18: 1, which ensures the sufficient dissolved oxygen in the reactor. Under the optimum operating conditions, the removal rate of total volatile phenol and total COD were 87.14 and 33.20, respectively. The continuous operation effect of the plant was stable and the degradation effect of pollutants was remarkable.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X742

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