Degreasing wastewater treatment device and process

Abstract

The invention discloses a degreasing wastewater treatment process. The process takes loading flocculation as a core, and a produced floc structure is compact, has small content of void water and is high in settling speed, good in uniformity, high in shear resistance and applicable to treatment of degreasing wastewater. Raw water enters a loading flocculation area in main equipment under pressure for flocculation, then, floc enters a settling area and a sludge concentration area, and clear water enters a clarification area, is discharged through a triangular weir and an annular collecting channel and enters a secondary reaction tank for secondary treatment. During process operation, the floc can form a suspension layer nearby a water outlet of the flocculation area under the action of gravity and rising hydraulic power, small floc and part of soluble organic matter can be removed. According to the process, loading flocculation, settlement, clarification, sludge concentration and other process units are integrated, and the integration of the main equipment is improved. The process is high in automation degree, wide in application range, low in capital construction investment and operation cost, small in floor area and simple to operate.

Description

technical field [0001] The invention relates to a water purification device, which is used to remove COD, suspended solids and heavy metal ions in degreasing wastewater, in particular to a water purification process with high-efficiency solid-liquid separation technology as the core to achieve high-efficiency and stable purification effects, which can be widely used in metallurgy , tanning, gelatin, electroplating and other industrial enterprises degreasing waste water purification treatment. Background technique [0002] Degreasing wastewater contains suspended solids, heavy metal ions, and a large amount of grease, and the COD often reaches 10,000 or even 100,000 levels. Using traditional biochemical treatment processes to treat wastewater requires large investment and high operating costs, and it is difficult to achieve the expected results. Fenton method and electrocatalytic oxidation method are also commonly used in the treatment of degreasing wastewater, but these two ...

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Problems solved by technology

[0002] Degreasing wastewater contains suspended solids, heavy metal ions, and a large amount of grease, and the COD often reaches 10,000 or even 100,000 levels. Using traditional biochemical treatment processes to treat wastewater requires large investment and high operating costs, and it is difficult to achieve the expected results.

Fenton method and electrocatalytic oxidation method are also commonly used in the treatment of degreasing wastewater, but these two treatment processes have the following defects: first, the Fenton method and electrochemical method are expensive to treat, and the Fenton method needs to add a large amount of chemical agents. The catalytic oxidation method has high requirements on the cathode plate, and the initial investment of the plate with precious metal coating is very huge; secondly, the Fenton method needs to adjust the pH to about 3~5, and the electrocatalytic oxidation method produces a large amount of available chlorine, which is very easy to corrode the equipment , the anti-corrosion technology requirements for the equipment are very high and the project investment cost is increased at the same time; again, the above two processes are better for the treatment of degreasing wastewater with lower COD, but it is difficult to meet the treatment requirements for degreasing wastewater with higher COD

[0006] To sum up, for the degreasing wastewater treatment process, so far there is no treatment method that can not only achieve satisfactory treatment effect, but also maintain a long working cycle, simple process, small footprint, convenient operation and low cost.

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