Method for preparing oil-removing microbial inoculum and method for treating oil field sewage by using oil-removing microbial inoculum

Abstract

The invention discloses a method for preparing an oil-removing microbial inoculum and a method for treating oil field sewage by using the oil-removing microbial inoculum. The method for preparing the oil-removing microbial inoculum comprises the following steps of: enriching bacteria in oily sewage and oily soil of oil fields, separating, purifying and screening to obtain oil-removing bacteria which are suitable for the oily sewage of the oil fields and are high in oil removal efficiency; combining and culturing to obtain a high-efficiency compound oil-removing microbial inoculum; and processing compound microorganisms into powder with relatively high activation rate. The oil-removing microbial inoculum is applied to high-salinity oily sewage of the oil fields. The method for treating the oil field sewage by using the oil-removing microbial inoculum comprises the following steps of: performing multiplication culture on the microbial inoculum, forming a biofilm in a biochemical pool, acclimating and culturing oily wastewater, and finally treating oily sewage. The method is high in biological activity, has a good oil removal effect, and fulfills the aim of high-efficiency oil removal, and the biofilm has high impact resistance; and the method for preparing the microbial inoculum has the characteristics of simple operation and low cost, and is suitable for large-scale production and application.

Description

technical field

[0001] The invention relates to a preparation method and application of a microbial composite bacterial agent, in particular to a bacterial agent for treating oily sewage in oilfields and its application in treating oilfield sewage. Background technique

[0002] Oily sewage in oil fields mainly contains various components such as petroleum, suspended solids, colloids, and chemicals. including emulsified oil and dissolved oil) and degradation of organic matter to water and CO 2 , Eliminate sulfide, effectively improve the stability of effluent water quality. The biochemical treatment method can degrade and transform the polluting substances of sewage, and finally achieve harmless treatment, so that water resources can be recycled; at the same time, it can improve the service life of equipment and filtering devices; this method consumes a lot of reducing substances, crude oil and other organic substances , reducing the organic nutrients that other microorgani...