摘要
某炼油厂炼制高环烷酸原油,其排放污水的COD(3 000~5 500 mg/L)远大于污水处理厂设计进水水质标准(2 400mg/L),导致污水处理厂不能达标排放。采用气相色谱-质谱联用仪对各处理单元出水分析发现,污水中环烷酸、茚酮类、环烯(烷)烃、含氮杂环化合物等有机物难以有效去除导致出水COD超标。通过参考大量文献,并结合现场试验确定采用曝气生物滤池(BAF)、水解酸化、臭氧催化氧化工艺对污水处理厂实施升级改造,改造后工艺流程为隔油+浮选+BAF+水解酸化+A^2O生化池+膜生物反应器+臭氧催化氧化+生物活性炭。改造后运行数据表明:BAF增强污水处理厂抗冲击负荷能力,大幅削减污水有机污染物负荷,出水COD<2 000 mg/L,确保A^2O生化池及后续处理单元在原设计工况下平稳运行;水解酸化能提升BAF废水可生化性(B/C),并具有"水质稳定器"作用;装填催化剂的臭氧氧化塔COD去除率高达69.4%,污水处理厂出水COD满足低于60 mg/L的排放要求。
The wastewater COD concentration（ 3 000-5 500 mg/L） from a refinery refining high naphthenic crude oil is far greater than the design index（ 2 400 mg/L） of the wastewater treatment plant（ WWTP）,resulting in incompliance of the discharge standard. By using gas chromatography/mass spectrometry（ GC/MS）,the effluents of each process unit were analyzed,showing that organic matters in wastewater,such as naphthenic acid,indene ketone,cycloalkene（ cycloalkanes） and nitrogen heterocyclic compounds,were difficult to be effectively removed,leading to exceeding of COD discharge standard. Referring to large number of literatures and combining the field pilot test,the processes of biological aerated filter（ BAF）,hydrolysis acidification and ozone catalytic oxidation were adopted for upgrading of the WWTP. The upgraded processes include oil separation ＋ two-stage flotation ＋BAF ＋ hydrolytic acidification ＋ A2O biochemical treatment ＋ membrane bioreactor（ MBR） ＋ ozone catalytic oxidation ＋ activated carbon. After upgrading,the operational data showed that the BAF could enhance the antishock loading performance of the WWTP,greatly decrease the organic pollutant load,with effluent COD 〈2 000mg/L,and make A2O biochemical treatment and subsequent processing units run stably under the original design conditions. The hydrolytic acidification could enhance biochemical B/C ratio of BAF wastewater,and serve as ＂ water quality stabilizer＂. The COD removal rate of ozone oxidation tower loading with catalyst was as high as69. 4%,and the effluent COD met the requirements of discharge standards（ 〈60 mg/L）.
作者
杨雄强
YANG Xiongqiang(Beijing BHZQ Environmental Engineering Technology Co., Ltd., Beijing 100025, China)
出处
《环境工程技术学报》
CAS
2017年第1期24-31,共8页
Journal of Environmental Engineering Technology
关键词
高环烷酸原油污水
曝气生物滤池(BAF)
水解酸化
臭氧催化氧化
high naphthenic acid crude oil wastewater
biological aerated filter（BAF）
hydrolytic acidification
catalytic oxidation of ozone
