Treatment method and system for wastewater containing polyacrylamide

Abstract

The invention provides a treatment method and system for wastewater containing polyacrylamide. The treatment method mainly comprises following steps: 1), biological supported particles are put in wastewater for impregnation, and adsorb polyacrylamide and indigenous microorganisms in the wastewater; 2), a microelement solution is added to the biological supported particles obtained in step 1), andthe indigenous microorganisms are promoted to perform anaerobic degradation on polyacrylamide; 3), activated carbon and biological sewage obtained in step 2) are subjected to ozone oxidation, and thetreatment is finished. The system comprises an anaerobic degradation device, an ozone oxidation device and a discharge device which are connected in sequence, and further comprises a biological supported particle reduction device. According to the method and the system, organic combination of a biological method, physical absorption and chemical reaction is realized, the probability of blockage caused by directly introducing polyacrylamide wastewater into a reactor is reduced, ecological destruction caused by polyacrylamide can be reduced fundamentally, activated carbon is repeatedly utilized,and the green, economical, energy-saving and environment-friendly treatment effects are realized.

Description

technical field [0001] The invention relates to the field of oilfield wastewater treatment, in particular to a method and system for treating wastewater containing polyacrylamide by using biological methods combined with physical and chemical treatment processes. Background technique [0002] In the oil extraction industry, it is usually called the primary oil recovery to use the energy of the oil layer to extract oil; injecting water and gas into the oil layer to supplement energy to the oil layer to extract oil is called the secondary oil recovery; and using chemical substances to improve oil, gas, water and rock The performance of each other, more oil is extracted, which is called tertiary oil recovery. In the tertiary oil recovery method of the oil field, the polymer flooding technology plays an important role. Among all polymers, polyacrylamide is used most due to its advantages of high relative molecular weight and good water solubility. After polyacrylamide is disso...

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Problems solved by technology

(1) Although the biological method has strong economic applicability, environmental protection, energy saving and no secondary poisoning effect, it has low efficiency and takes a long time

(2) The chemical method has the advantage of high efficiency, but it is not widely used due to high energy consumption and easy production of environmentally harmful intermediates or products

(3) The physical method is only for

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