Rapid start-up process of oily sewage biochemical treatment system in oil field

A treatment system and oilfield technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, sustainable biological treatment, etc., can solve the problems of high dissolved oil content in emulsified oil, slow microbial growth rate, high treatment cost, etc. , to achieve strong impact resistance, enhanced adhesion, and high biological activity

Active Publication Date: 2011-09-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, judging from the current application situation, there are still the following problems in the treatment of oily sewage by using physical and chemical methods: First, the emulsified oil and dissolved oil content in oily sewage is high, which is difficult to remove efficiently by traditional physical and chemical processes; second, the effluent quality is stable after physical and chemical treatment The water quality is poor, and the secondary pollution along the water quality is serious; the third is that after the physical and chemical treatment, the amount of sludge is large, the sludge oil content is high, the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0049] The test adopts two-stage contact oxidation mode, the volume of each biochemical tank is 40L, and the designed treatment capacity is 45L / h. The combined fiber hydrophilic filler is used. The test temperature is 30°C and the pH value is 6.5. The test sewage is oilfield sewage with an oil content of 30mg / L. Sulfide 15mg / L, total salinity 16699 mg / L, influent COD: 350mg / L, BOD: 200mg / L.

[0050] Start the system in strict accordance with the "Rapid film-hanging start-up process for oily sewage biochemical treatment system in oilfields". Nine days after the system was started, the system's oil removal efficiency reached 90%, the COD removal rate reached 80%, and the sulfide removal rate reached 100%. After the fifteenth day, the oil removal efficiency of the system reached over 98%, the COD removal rate reached 80%, and the sulfide removal rate reached 100%. The biofilm has high activity and high treatment efficiency, which achieves the purpose of quick start-up of biochemi...

example 2

[0052] Field application of a sewage treatment station in an oil field. Two-stage contact oxidation mode is adopted, and the volume of each biochemical pool is 200m 3 , design capacity 25 m 3 / h, using combined fiber hydrophilic filler, the temperature of oilfield sewage is 32°C, the test sewage is oily 42mg / L, sulfide 20mg / L, total salinity 25965mg / L, influent COD: 400mg / L, BOD : 200mg / L.

[0053] Start the system according to the "Rapid film-hanging start-up process for oily sewage biochemical treatment system in oilfields". Ten days after the system was started, the oil removal efficiency of the system reached 85%, the COD removal rate reached 75%, and the sulfide removal rate reached 100%. After the fifteenth day, the oil removal efficiency of the system reached over 98%, the COD removal rate reached 80%, and the sulfide removal rate reached 100%. The membrane activity is high, the treatment efficiency is high, and the oil removal effect is good, which achieves the purp...

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Abstract

The invention provides a rapid start-up process of an oily sewage biochemical treatment system in an oil field, belonging to the technical field of oily sewage treatment in the oil field. The process has the following beneficial effects: the earth surface clear water is firstly subjected to pre-start-up and then the oily sewage in the oil field is pumped to be subjected to start-up, the bacillus is selected as an oil removing bacterial agent and a biological strengthening agent formed by rapeseed cakes, wheat bran, inorganic phosphate and inorganic ammonium salt is used for strengthening the tolerance of the microorganisms to salinity and other biological inhibitors so as to effectively improve the activity of the microorganisms; in the start-up process of the biochemical system, the salinity increase speed is reasonably controlled, the microorganisms in the oily sewage with high salinity have high activity and large biomass while salinity increase is ensured and the adhesive capability of the microorganisms on the fillers is enhanced to achieve the aim of rapid start-up of the oily sewage biochemical treatment system in the oil field.

Description

technical field [0001] The invention relates to the technical field of oily sewage treatment in oil fields. Background technique [0002] Oilfield produced water mainly contains various components such as petroleum, suspended solids, colloids, and chemicals. The current treatment methods mainly include physical and chemical methods (including electrochemical methods) and biological methods. [0003] The physical and chemical method is mainly composed of water purification system (oil removal, solid particle removal), water quality stabilization (sterilization, sulfur removal, corrosion prevention and scale prevention, etc.) system and supporting systems such as sewage discharge and sludge treatment. It is currently the most widely used water treatment at home and abroad. craft. However, judging from the current application situation, there are still the following problems in the treatment of oily sewage by physical and chemical methods: first, the emulsified oil and dissolv...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/34
CPCY02W10/10
Inventor 罗江涛徐卫华薛芸杨海滨杨帆王彪庄建全
Owner CHINA PETROLEUM & CHEM CORP
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