Treating process of dilute emulsified oily watewater

Abstract

The invention provides a technology for treating dilute emulsified oiliness wastewater comprising the steps of uniform aeration adjustment, one-stage pH regulation, two-stage pH regulation, coagulation, air floatation, cooling, biological contact oxidation, flocculation deposition, part sludge reflux, after the above steps, the effluent reaches the discharge standard or the recycling standard. The technology of the invention effectively overcomes the problems of weak safety, high requirement for operation running and daily management and secondary pollution and the like, furthermore has the advantages of low once investment, stable treatment effect, low production operation running cost and simple operation running.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a treatment process for dilute emulsified oily wastewater. Background technique [0002] Oily wastewater refers to wastewater containing lipids (fatty acids, soaps, fats, waxes, etc.) and various oils (mineral oils, animal and vegetable oils). Oily wastewater is characterized by high COD and BOD, certain odor and color, flammable, easy to oxidize and decompose, generally lighter than water, and insoluble in water. Its pollution is mainly manifested in the following aspects: [0003] 1. Deteriorating water quality and endangering aquatic resources; [0004] 2. Harmful to human health; [0005] 3. Air pollution; [0006] 4. Affect crop production; [0007] 5. Affect the natural landscape; [0008] 6. Affect clean natural water sources. [0009] In view of the pollution of oily wastewater, my country stipulates that the maximum allowable discharge concentration of oi...

AI Technical Summary

Problems solved by technology

[0003] 1. Deteriorating water quality and endangering aquatic resources;

[0004] 2. Harmful to human health;

[0005] 3. Air pollution;

[0006] 4. Affect crop production;

[0007] 5. Affect the natural landscape;

[0008] 6. Affect clean natural water sources

The problems of this type of process are: (1) complex process and poor safety; (2) high one-time investment cost; (3) high requirements for operation and daily management, and it is difficult to meet the emission standards stably; (4) high operating cost ; (5) The amount of sludge produced after dosing is large; (6) There is secondary pollution and the difficulty of increasing subsequent treatment

However, there are still some problems in the current biological contact oxidation method, such as the poor ability to withstand the impact load of incoming water, and it is prone to large fluctuations in the effluent index, which will cause the effluent index to exceed the standard in a short period of time; the imported special bacteria are used, and the cost is high, etc.

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