Treatment process of processing wastewater after nuclear power equipment forging-casting part welding

Abstract

The present invention discloses a treatment process of processing wastewater after nuclear power equipment forging-casting part welding. According to the treatment process, wastewater enters a grid well, and then enters an oil isolation adjustment pool through a gate well, the floating oil on the surface is isolated, and uniform mixing is performed; the mixed wastewater is lifted to a 1# coagulation and precipitation integrated pool to remove most of suspended solids and organic matters, and then the supernatant enters an air dissolving air floatation device so as to further remove suspended solids and most of petroleum base substances; the pH value of the effluent of the air dissolving air floatation device is adjusted to 2.5-3.5, then the effluent is lifted to a Fenton reactor, and the remaining difficultly-decomposed loop chains and the remaining difficultly-decomposed macromolecule organic matters in the wastewater are removed through a strong oxidation effect; and the wastewater after the Fenton reaction sequentially enters a 2# coagulation and precipitation integrated pool and an intermediate water pool, and then is lifted to a multi-media filter, the remaining suspended solids are removed through a deep filtration effect, and the obtained water enters a clear water pool and then is subjected to standard discharge. According to the present invention, the classification collection, pretreatment and biochemical treatment combined technology is adopted so as to substantially reduce the pollutants in the treated wastewater and meet the national emission standards.

Description

[0001] technical field [0002] The invention relates to the field of waste water treatment in the coating field, in particular to a process for treating waste water after welding casting and forging parts of nuclear power equipment. Background technique [0003] Nuclear power equipment casting and forging post-welding processing wastewater mainly comes from the degreasing wastewater of the coating line, the silanization wastewater of the coating line, the purification wastewater of the painting line, the degreasing wastewater of the pickling line, and the oxidation treatment tank wastewater of the blackening line. Processing wastewater contains pollutants such as resins, surfactants, heavy metal ions, pigments, etc., especially the composition of spray painting wastewater is complex, and the concentration of ring chains such as xylene, non-methane total hydrocarbons, resins, and macromolecular refractory organic matter is high. Poor biodegradability. And because there ...

AI Technical Summary

Problems solved by technology

[0004] At present, the processing wastewater after welding of castings and forgings of nuclear power equipment mainly uses processes such as separation, coagulation sedimentation, coagulation air flotation, sand filtration and other processes to treat coating wastewater, which is difficult to achieve the ideal treatment effect

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