| Most oil fields of our country have already entered three oil recovery stages, the waste water amount produced in the course of recovering the oil increases year by year too.1996, 1997, 1998, petroleum enterprise recover the oil and abolish aquatic products borning amount respectively: 684,260,000 tons, 728,080,000 tons, 410,480,000 tons; The waste water is discharged after dealing with to recover the oil: 36,960,000 tons, 39,590,000 tons, 28,260,000 tons; Outside arrange constitute and produce water proportion: 5.4%,5.4%,6.9%; Outside arrange waste water spot check getting up to standard for 34% - 23% - 51%.At present, some oil field exploit waste water amount that publish exceed water yield of recycle of oil field far, Make oil recovery waste water of a certain amount must carry on outside arrange, this puts forward a series of questions on giving to the scientific research worker. How choose an effective treatment craft , become the research focal point of this text, In summarize this text domestic, at the other foundation of scientific findings, propose relying mainly on the fact that chemistry is mixed and congealed - the living beings keep in touch and is oxidized, Through throw and add high-efficient petroleum degrade microorganism, complement in order to sink sand, degrease, filter and treatment technological process of method of absorbing etc.. Indicate through research, in chemistry flocculation part, confirm flocculation as PAC, On terms that the joining amount is that 4ml/L, temperature are that 30℃ ,PH is 7.0, the rotational speed is 200 rpms, react time as 30 ses, The time of subsiding is under the condition of 30min, CODcr value of waste water drop to 379 mg/Ls from 15920 mg/Ls equally.While the separation of the high-efficient bacterial is screened , screen 3 bacterials with high- efficient degrading rate to the crude oil, LSD-3 density among the50-150 mg/L waste water in crude oil among them, degradation rate of crude oil about to up to 70%, And with mix bacterial degradation ability of crude oil been made and compares to single bacterial strain, Find and mix bacterial have fine degradation ability than single bacterial strain, too to mix bacterial most right to train terms make and study, Confirm and mix best cultivation of fungus terms neutral for 7.5 hydrogen ion index, ore spend 7800 mg/L, temperature 40℃ , fine oxygen, oil density 50-150 mg/Ls. In Bio-contect Oxidation stage, through compare with experiment find and throw and add high- efficient bacterial not merely can improve waste water, biochemistry in living beings, Can improve the result of degrading even more, shortened and reflect time, in addition confirmed access amount of the high-efficient fungus as 0.2%, Response time for one hour, react temperature as 40℃ , dissolve oxygen under 2 terms of mg/L, COD of waste water mix 379mg/L reduce 150 mg/Ls to from side to side after congealing, reach national petroleum second discharge standard of enterprises... |
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