Research On Degradation Of Chemical Oxygen Demand With Heavy Oil Sewage In Chen Zhuang Of Sheng Li Oil Field

With the fact that oil field exploration turn into advanced period, the heavy oil mine takes up more and more important gravity. The exploration of heavy oil consumption of water and bring large amount of oil sewage. A lot of research work has been done about reusing the heavy oil sewage in thermal steam generators in china. No substantive progress and large-scale application has been made in research of reusing heavy oil sewage, because of complexity and high temperature of water quality,the serious emulsification of heavy oil effluent and immature process with water treatment.In summary, the study that the project of reusing of heavy oil sewage in thermal steam generators as example. The main purpose of this paper is to research with the difficult problem of degradation of chemical oxygen demand (COD) during pretreatment of wastewater and provide a theoretical basis and technical support for improve ruse rate of oil water. The innovative research results and conclusions of the paper are summarized as follows:1. Adjust the way of aeration in simulated biological contact oxidation, experiments show the COD removal reached 55% within 12 hours. DO is 4~5mg/L with continuous aeration.2. Regularly adding nutrition in the simulated biochemical pool,the study found the optimum proportions COD:N:P=100:5:1 when nitrogen was ammonium nitrate and phosphorus source was potassium phosphate monobasic. Under these conditions, the COD of water out of biological oxidation after 12 hours was less than 140mg/L.3. Lead into anaerobic pool before living things contacts oxide pool and research on the COD removal of wastewater in A-O process. The experiments revealed COD was 120mg/L and removal was more than 60%. The best operating conditions of A section: temperature was 40~45℃; HRT was 12 hours. The best operating conditions of O section: temperature was 37~40℃; HRT was 8 hours.4. A dominant bacteria community with pertinence of heavy oil sewage was built by the techniques of cultivation and filtration. Through shaking experiments that insert advantage bacterium into stimulant biochemistry production water, the best degradation conditions of bacteria community presented as follows: the temperature was 37°C, the rotating speed was 140 r/min. COD fell to 80mg/L after 12 hours of experiments. The enhanced biochemical pool was set up by training and filtrating dominant bacteria community. Connect the enhanced biochemical pool with biological contact oxidation and established two biochemical pools. The best operating conditions of O1 section: temperature was 37~40℃; HRT was 8 hours. The best operating conditions of O2 section: temperature was 37~40℃; HRT was 12 hours.COD fell to 90mg/L.5. By chemical analysis of water production the contribution of each component of the COD value. The molecular biological analysis results showed the COD removal was increased when inserted dominant bacteria into biochemical process.Results of this research provide a optimization of process which support for the difficult degradation of COD problem in heavy oil wastewater reuse, solve UF - RO membrane plugging problems, to increase heavy oil wastewater reuse rate, offer effective protection of the pretreatment for the using of application of membrane technology in oil wastewater reuse field. In summary, the results of this research have positive guiding significance for resourceful disposal of oil field waste water.