曝气生物滤池的改造以及多级生物处理系统-Fenton流化床组合工艺处理炼油污水的研究

发布时间：2018-01-12 15:22

本文关键词：曝气生物滤池的改造以及多级生物处理系统-Fenton流化床组合工艺处理炼油污水的研究　出处：《北京化工大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国是一个水资源污染严重的国家,炼油污水作为难处理的工业污水,其是否达标排放深刻地影响着地表水环境。对于炼化企业,目前主要通过对原有污水处理设施的改造或新建使用新工艺的污水处理厂来达到合格排放要求。本课题的研究工作主要分为两个部分：一是通过对某石化企业的曝气生物滤池进行更换填料及投加高效微生物菌种,以实现提高出水水质的目的；二是对某炼油厂的预处理污水的特征分析,使用多级生物处理系统-Fenton流化床组合工艺进行处理,为该厂的提标改造工程提供依据。通过试验,得到如下结论：1、某石化企业的石化废水的深度处理采用曝气生物滤池。由于滤池原有火山岩自身的不足,以及长期运行造成的滤料的老化,导致出水水质难以达标,因此采用高效多孔悬浮填料对BAF进行改造。改造后,BAF出水的COD平均去除率达到28.1%,比改造前提高了119%以上；出水的氨氮平均去除率为25.8%,比改造前多提高了2.6%以上。出水COD和氨氮基本上能够达到《城镇污水处理厂水污染物排放标准》(DB11/890-2012)的A级排放标准。2、采用多级生物处理-Fenton流化床组合工艺对某石化企业的炼油污水进行处理,重点考察了HRT对多级生物处理系统的影响以及pH值、H2O2/Fe2+摩尔比、H2O2/COD质量比对Fenton流化床处理效果的影响。结果表明,多级生物处理系统的最佳HRT为43.2 h；Fenton流化床最佳工艺条件为：pH值为3.0～4.0、H2O2投量为1.0 g·L-1、FeS04·7H20投量为2.0 g·L-、反应时间为30 min。该组合工艺在总HRT为45 h的条件下,在进水COD为435～1020 mg·L-1较大的范围内变动时,系统总出水COD始终在30 mg-L-1以下,平均去除率达到96.54%；在进水氨氮为9.36-31.2mg·L-1范围内变动时,系统总出水氨氮维持在0.05 mg·L-,平均去除率为99.72%。处理后出水水质满足《污水综合排放标准》(GB 8978-1996)的一级排放标准。
[Abstract]:China is a country with serious pollution of water resources. Refinery sewage, as a refractory industrial sewage, has a profound impact on the surface water environment. At present, the qualified discharge requirements are mainly achieved through the renovation of the existing sewage treatment facilities or the construction of new sewage treatment plants using the new process. The research work of this subject is divided into two parts:. The first is to replace the fillers and add high efficient microbial strains to the aerated biofilter of a petrochemical enterprise. In order to achieve the purpose of improving the effluent quality; The second is to analyze the characteristics of pre-treated wastewater in a refinery and treat it with a multi-stage biological treatment system-Fenton fluidized bed combination process, which provides the basis for the upgrading project of the plant. The conclusions are as follows: 1. Biological aerated filter is used in the advanced treatment of petrochemical wastewater in a petrochemical enterprise. Because of the deficiency of the original volcanic rock in the filter and the aging of filter media caused by long-term operation. As a result, the effluent quality is difficult to reach the standard, so the BAF was modified with high efficiency porous suspension filler. The average COD removal rate of the effluent reached 28.1% after the revamping. More than 119% more than before the transformation; The average removal rate of ammonia nitrogen in effluent is 25.8%. The effluent COD and ammonia-nitrogen can basically meet the discharge standard of water pollutants in urban sewage treatment plant (DB11 / 890-2012). Level A emission standard. 2. The multistage biological treatment-Fenton fluidized bed process was used to treat the refinery wastewater from a petrochemical plant. The effect of HRT on the multistage biological treatment system and pH value were investigated. The effect of H _ 2O _ 2 / Fe _ 2 molar ratio and H _ 2O _ 2 / COD mass ratio on the treatment efficiency of Fenton fluidized bed shows that the optimum HRT of multistage biological treatment system is 43.2 h; The optimum technological condition of Fenton fluidized bed is that the dosage of H _ 2O _ 2 is 1.0 g 路L ~ (-1) 路L ~ (-1) and the dosage of H _ 2O _ 2 is 2.0 g 路L ~ (-). The reaction time was 30 mins. Under the condition that the total HRT was 45 h, the influent COD was 435 ~ 1020 mg 路L ~ (-1). The total effluent COD of the system was always below 30 mg-L-1, and the average removal rate was 96.54%. When the influent ammonia nitrogen ranged from 9.36 to 31.2mg 路L -1, the total effluent ammonia nitrogen was maintained at 0.05 mg 路L -. The average removal rate is 99.72.After treatment, the effluent quality meets the first class discharge standard of Integrated Wastewater discharge Standard (GB8978-1996).
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X742

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