A purification treatment process for alkaline organic industrial waste liquid

Abstract

The invention provides a purification treatment process of an alkaline industrial waste liquid; a two-step pH value adjustment process of firstly neutralizing and then acidizing is adopted, so that high-concentration organic matters can be more effectively removed in a staging mode, so as to achieve a better purification treatment effect. Moreover, in the process of two times of sedimentation treatments, a treatment temperature is gradually increased, so that re-aggregation of decomposed organic matter particles can be effectively avoided so as to avoid an adsorbing effect from being affected. At different stages of sedimentation, flocculation sedimentation materials with different properties and parameters are targetedly selected and used, and thus the more effective organic matter removal effect is obtained. The pH value of sedimentation is reasonably set, so as to be more beneficial to the decomposition of the organic matters. A special acidic solution is used for adjusting the pH value so as to obtain a better organic matter decomposition adsorption effect. The organic matters are further decomposed by adding an appropriate amount of hydrogen peroxide, so as to better make the organic matters adsorbed and settled.

Description

technical field [0001] The invention relates to the technical field of purification treatment of industrial wastewater, in particular to a purification treatment process of alkaline industrial waste liquid. Background technique [0002] With the rapid development of my country's economy, the problem of water pollution is becoming more and more serious, especially in the printing and dyeing industry, printed circuit board industry, electroplating industry, oil refining industry and other industrial fields, often produce high-concentration organic wastewater / waste liquid, these The COD concentration of organic wastewater / waste liquid is very high, even as high as COD ≥ 200,000 mg / L, and these organic waste liquids often contain a large amount of alkaline substances and salts, such as printed circuit board etching, developing waste liquid, oil refining The alkali slag waste liquid of the factory and so on. [0003] For this kind of alkaline organic industrial waste liquid, if th...

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Problems solved by technology

The traditional multi-effect evaporation concentration system can effectively reduce evaporation energy consumption, but its separation efficiency for organic matter and water is very low, and the concentration of organic matter in alkaline organic industrial waste liquid is high, resulting in the COD of the distilled wastewater still remaining Very high, the obtained distilled water needs further biochemical or physicochemical treatment before it can be discharged up to the standard