White carbon black production wastewater treatment technology

Abstract

The invention belongs to the technical field of chemical wastewater treatment, and in particular relates to a white carbon black production wastewater treatment technology. The technology comprises the steps of pretreating white carbon black production wastewater so that the water quality of the treated wastewater can reach the water quality requirement of a membrane treatment system; carrying out membrane filtration so that enriching sodium sulfate in the wastewater is enriched at one side of a membrane until the content of sodium sulfate is not less than 10% and the produced water at the other side reaches a recycle water index and is recycled to a production system for reuse; carrying out freezing crystallization on the thick water to separate out mirabilite, separating out the crystallization mother liquor so as to obtain the mirabilite and returning the crystallization mother liquor back to a membrane concentration system, and thermally dehydrating the mirabilite so as to obtain anhydrous sodium sulphate which is not less than 98% and used for selling; or evaporating and crystallizing the thick water with the sodium sulfate being not less than 10% through directly utilizing an evaporator so as to separate out the anhydrous sodium sulphate. The water source recycling and chemical raw material recovery are realized through low energy consumption. Through cooperatively using two technologies, the energy consumption for treating each tonnage of wastewater can be greatly reduced, and the water recovery rate of a whole treatment system is not less than 92%; the sodium sulfate content of an anhydrous sodium sulphate product is not less than 98%.

Description

technical field [0001] The invention belongs to the technical field of chemical wastewater treatment, and in particular relates to a white carbon black wastewater treatment process. Background technique [0002] Through the analysis of the water quality of the white carbon black wastewater, the main reason why the white carbon black wastewater is difficult to treat is caused by two steps. First, compared with the traditional chemical wastewater, the sodium content is relatively high, which is difficult to remove through traditional biochemical and physical and chemical methods; second. Compared with the production process of industrial raw materials, the sodium and salt content of wastewater is relatively low. Using the traditional salt extraction process, if the salt drying process takes up a large area, it is easy to cause local salinization of the land, and it is not easy to use in inland areas. The energy consumption per ton of the flash evaporation process is too high. ...

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Problems solved by technology

[0002] Through the analysis of the water quality of the white carbon black wastewater, the main reason why the white carbon black wastewater is difficult to treat is caused by two steps. First, compared with the traditional chemical wastewater, the sodium content is relatively high, which is difficult to remove through traditional biochemical and physical and chemical methods; second. Compared with the production process of industrial raw materials, the sodium and salt content of wastewater is relatively low. Using the traditional salt extraction process, if the salt drying process takes up a large area, it is easy to cause local salinization of the land, and it is not easy to use in inland areas. The energy consumption per ton of the flash evaporation process is too high

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