Research Of Processing Engineering On Chemical Industrial Sewage In Daqing Oil Field

In order to deal with chemical industrial sewage in Daqing, and improve water quality to achieve the national second levels of standards, we have carried out the biological method for the research on processing sewage technology. Before the biological treatment, we carry on the pretreatment sewage with flocculation to remove the organic aerosol, simultaneously choose a suitable biological mold mushroom spawn being useful for the chemical sewage system, then through biological technology on water treatment to process deleterious substances in sewage system.1 Design on experiment principle1.1 Selection and application mechanism of flocculantThe flocculant of polymer positive ion, polyacrylamide(CPAM), which has been used in the Daqing Oil Field, was selected in this research. The mechanism is that there is a unique– CONH2 functional group in polymer structure, it shows adsorption bridging function between the molecular chains of the suspension, increases the size of the cotton wool body vitriol flower, that is good for subsiding and removing the macro-molecule material in sewage system.1.2 Processing sewage by biological methodThe selected biological methods include biological treatment crafts of the love-oxygen biology system, anaerobic biology system and the concurrent-oxygen biology system. We select a mold mushroom spawn that is suitable for screening processing sewage in this experiment, and use it with anaerobic sludge to apply in the test installation, finally determined that the water treatment UASB- love-oxygen craft is the preferred plan2 Experiment content2.1 waste water treatmentWe match 1% and 5%wt of polyacrylamide (CPAM) with the distilled water as flocculation solution. Then put 50ppm and the 100ppm flocculation solution into each water sample separately, determines the COD value before and after adding the flocculation solution. The results indicate that the COD values of synthetic ammonia, the surfactant and the acetic acid installment sewage do not decrease; In methanol and the light hydrocarbon installment sewage, the organic positive ion flocculant of polyacrylamide can adsorb and flocculate efficiently two sewage aerosol materials and so on hydrocarbon compound, waxy compound and lubricating oil, can the effective elimination harm installment and the flammable explosive material enters the following craft before biological law processing. After the flocculant content increasing, the COD value of experimental waste water enhance, our experiments regarding the positive ion polyacrylamide obtain the best flocculant content about 1%wt.2.2 Biology experiment2.2.1 Mold mushroom spawn screening and methodIn the massive mold mushroom spawns preserves which from our topic-based group carries on is suitable the mold mushroom spawn screening, will wait the screening strain separately to vaccinate in turn in the waste water. Mainly uses the determination strain takes strain screening in the waste water growth as well as the COD elimination quantity the target.After the beginning selection and duplicate sieves selection of the mold mushroom spawn, finally 9 kinds of mold mushroom spawn are determined to join in the reactor carrying on the experiment.2.2.2 Processing experimentUsed 2 sets slightly to try to install (i.e. UASB- good oxygen craft, the good oxygen - UASB craft and the SBR craft).UASB reactor dischargeable capacity is 10 L, the good oxygen reactor dischargeable capacity is 5 L, enters the water speed of flow is 0.5-1.0 L/h, the water power resident time is: UASB (20-10 h), good oxygen reactor (10-5 h).The SBR reactor dischargeable capacity is 10 L, water power resident time 30 h,12 h is a cycle: Enters water 30 min, tires of oxygen 6 h, ventilates 3 h (ventilation quantity 70 L/h), precipitates 2 h, drains water 30 min. Enters the water configuration proportion: Methyl alcohol intermixture 29.8%, synthetic ammonia MDEA waste water 3%, synthetic ammonia condensate 30%, acetic acid installment waste water 34.1%, light hydrocarbon waste water 1.4%, table live medicinal preparation waste water 1.7%.2.2.3 Experiment resultsSlightly the system is tried to mix the waste water to show the very good processing effect, specially after the stable movement, had achieved to the COD elimination rate 99%, the majority time water leakage have achieved the national level emissions standard (<100 mg/L), so long as the entered water density is stable, the system load is stable, that can attain a designated standard the requirement of the national second level of emissions standards (<150 mg/L).