Biochemical exterior drainage decoloring agent and preparation method thereof

Abstract

The invention discloses a biochemical exterior drainage decoloring agent, solving the problems of expensive price, low decolorizing efficiency, easy generation of secondary pollution and complex production and operation process of the existing decoloring agent. The decoloring agent of the invention is prepared by the method comprising the following steps: putting 200 parts of semi-coke particles by weight and 1-3 parts of catalyst by weight into a closed reactor, wherein the catalyst is an alkali carbonate catalyst; raising the temperature of the closed reactor to 700-1100 DEG C, and then introducing CO2 gas into the closed reactor to carry out an activating reaction on raw materials in the presence of the catalyst to generate a semi-coke modifier; and cooling down to room temperature after gas introduction, and taking out the activation reactant semi-coke modifier, i.e. the decoloring agent. The decoloring agent of the invention has simple process, low cost of the raw materials, low production cost, good decoloring effect, no secondary pollution on the environment and extremely high resource utilization rate.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a biochemical external drainage decolorizing agent used in the field of metallurgy and environmental protection and a preparation method thereof. Background technique [0002] The decolorization of sewage treatment has always been one of the research hotspots in the field of environmental protection, especially the biochemical external drainage of the metallurgical industry, such as coking wastewater, has always been one of the difficulties in wastewater treatment in the metallurgical industry. With the continuous development of biochemical treatment processes for coking wastewater in recent years, COD, NH 3 -N and other pollutant indicators have reached the national first-level discharge standard, but the color of wastewater has always been one of the difficulties that plague the discharge and reuse of biochemical external drainage. According to the actual measurement, t...

AI Technical Summary

Problems solved by technology

The main component of polymer quaternary ammonium salt decolorizer is polymer organic matter. The principle of decolorization is mainly flocculation. The chroma in water is removed with the accumulation and flocculation of flocculant. This kind of decolorizer needs to be cleaned immediately after decolorization. Otherwise, the flocculated substances are easy to decompose. In addition, this type of decolorizing agent will introduce quaternary ammonium salts into the water, and a small amount will remain in the water while removing the color, thereby causing secondary pollution to the wastewater. And there is also the problem of environmental impact in the follow-up treatment of the flocs collected after flocculation

The adsorption effect of activated carbon is good without secondary pollution, but activated carbon is expensive, and it is difficult to apply it on a large scale in industry. At present, the price of activated carbon on the market is about 5,000 yuan / ton. High price and high cost limit the use of activated carbon in wastewater. Large-scale application in the industry, currently only used in the deep purification of tap water and drinking pure water

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