Integrated treatment process of enhanced flocculation and bio-contact oxidation for high-salt oil-containing wastewater

Abstract

The invention discloses an integrated treatment process of enhanced flocculation and bio-contact oxidation for high-salt oil-containing wastewater, which uses a two-step serial biochemical reactor combining a push flow bio-contact oxidation reactor and a completely mixed bio-contact oxidation reactor. The treatment process comprises a combined process preparation stage and a treatment stage, wherein the preparation stage comprises the steps of selecting fillers, culturing sludge and hanged membrane, and preparing flocculant; the treatment stage comprises enhanced flocculation treatment and bio-contact oxidation treatment. Cured flocculant adopted by the invention has better flocculation effect and adsorption-bridge capacity for suspended substances and emulsified oil and stronger demulsifying capacity for emulsified oil water, and is applied to treatment of emulsified oil containing wastewater; under change of inflow water quality, flow and saltness, the invention has strong impact resistance on load capacities and stable yielding water quality. The COD of the yielding water is below 40mg / L, and the removing rate reaches 90%. The invention is an efficient way for treating high-salt oil containing wastewater and has vast potential for future development.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to an integrated treatment process of enhanced flocculation and biological contact oxidation for high-salt and oily wastewater. Background technique [0002] The wastewater treatment process is classified according to the treatment principle, and is divided into physical method, chemical method, physical chemical method and biochemical method. The physical method is divided into gravity separation method, coarse granulation method, filtration method, membrane separation method, etc.; the chemical method is divided into chemical demulsification and chemical oxidation method (such as air oxidation method, O 3 Oxidation method, chlorine oxidation method, H 2 o 2 Oxidation method, Fenton oxidation method, KMnO 4 Oxidation method, etc.), UV oxidation method, etc.; physical and chemical methods include air flotation, adsorption, magnetic adsorption separation, elect...

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Problems solved by technology

Although these methods have a certain degreasing effect, they all have more or less shortcomings and are not easy to be popularized and applied in industry. For example, the oil separation method can only remove large particles of oil droplets, but cannot remove emulsified oil and dissolved oil in water; The air flotation method needs to add a demulsifier and the oil is not easy to recover, so the treatment cost is high; the regeneration of activated carbon in the activated carbon adsorption method is difficult; the mesh cloth of the phase separation method is very easy to block

[0004] In addition to the above methods, biological treatment technology is recognized as a good choice for the treatment of high-salt oily wastewater because it will not cause secondary pollution. A single strain is the target, but a single strain is limited in the treatment of high-salt oily wastewater containing multiple components of organic matter, and the inhibition of high salt concentration on microorganisms affects the effluent water quality; Flocculation treatment is an important part, but among the currently commonly used flocculants, there is no flocculant that has good coagulation and demulsification performance for the treatment of high-salt oily wastewater at the same time, such as basic aluminum chloride can only compress emulsified The electric double layer of the droplet reduces the zeta potential, but cannot change the structural film on the surface of the emulsion droplet, and cannot achieve complete demulsification

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