Biochemical treatment method for improving polymer-containing sewage matrix of oil field

Abstract

The invention relates to a biochemical treatment method for improving polymer-containing sewage matrix of the oil field. Polymer-containing sewage is firstly added with a demulsifier and enters a demulsification buffer tank for demulsification, after a pH regulator is added to effluent of the demulsification buffer tank, the effluent enters a pH regulating tank and enters a floatation tank for floatation after pH is regulated, and a flocculant adding point is arranged at an inlet of the floatation tank; effluent of the floatation tank enters a filter, is filtered and then enters a water buffer tank, a compound biological nutritional agent is added, effluent of the water buffer tank sequentially enters an anaerobic tank and an aerobic tank for treatment and performs mud-water separation through a settling pond, a liquid supernatant of the settling pond is discharged after meeting the standard, a part of sludge at the bottom of the settling pond flows back to the front end of anaerobic tank, the remaining sludge and dross produced during floatation enter a sludge concentration tank and are concentrated and dewatered by a dewatering device. The treatment efficiency is high, the load impact resistance ability is high, the operation is stable and standard discharge after treatment of the polymer-containing sewage of the oil field is realized.

Description

technical field [0001] The invention belongs to the technical field of oilfield sewage treatment, and in particular relates to a biochemical treatment method for improving the matrix of oilfield sewage containing aggregates. Background technique [0002] Oilfield polymer-containing sewage refers to oilfield produced water containing a large amount of polymers produced during oilfield polymer flooding. It is a kind of organic sewage with high viscosity, high degree of emulsification, and refractory biodegradation. Polymer-containing sewage not only has the characteristics of conventional water flooding produced water, including oil, suspended solids, salts, high salinity, etc., but also contains a large amount of polymers and surfactants. At the same time, due to the existence of a large number of polymers, the viscosity of the polymer-containing wastewater increases, the degree of salinity increases, the degree of emulsification increases, and the difficulty of treatment inc...

AI Technical Summary

Problems solved by technology

For oilfield conventional water flooding produced water, oil and suspended pollutants in sewage can be removed well, but due to the nature of poly-containing sewage, the treatment effect on poly-containing sewage is not ideal, and the effluent index cannot meet the relevant discharge standards. The existing conventional treatment technology for oilfield sewage can no longer meet the requirements of polymer-containing sewage treatment

[0005] The impact of polymer on sewage treatment mainly includes the following aspects: 1. The viscosity of sewage increases, and the sedimentation of suspended solids becomes worse; 2. The stability of colloids in sewage increases, the particle size of oil droplets becomes smaller, and the difficulty of oil-water separation increases; 3. The polymer has strong adsorption, and the amount of sediment carried increases; 4. A large amount of polymer further reduces the B / C of sewage, and the biodegradability is even worse

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