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

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...

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 sludge harmless treatment is difficult, and the treatment cost is high

[0006] 1. The salinity of oily sewage in oilfields is generally 10,000-60,000mg / L, up to 200,000mg / L. In a high-salinity environment, the activity of microbial metabolic enzymes is hindered, and the growth rate of microorganisms is slow or does not reproduce, which will cause oily pollution in oilfields. Deal with the consequences such as long start-up period of system film formation, poor degreasing effect or failure of system film formation start-up

[0007] 2. The biofilm is polluted by crude oil, and the biofilm has poor ability to absorb microorganisms