Wastewater treatment process for fine chemical pharmaceutical intermediates

Abstract

The invention discloses a process for treating fine chemical medical intermediate wastewater, which comprises a pretreatment section of a Fe/C microelectrolysis unit, a multi-effect evaporation unit and an advanced oxidation unit, a biochemical section of an enhanced AO biological contact oxidation unit and an MBR unit, and a deep treatment section of DTRO membrane recycling. The pyrolysis section comprises a concentrated salt solution pyrolysis gasification unit and a flue gas treatment unit. The medical intermediate high-salt-content wastewater is subjected to multi-effect evaporation and pyrolysis treatment, the treatment amount and treatment cost of waste salt can be reduced, the environmental protection fund pressure of enterprises is reduced, pretreatment, biochemical treatment and deep treatment are combined for treatment, the influence of the water quality of raw water is small, operation has flexibility and impact resistance, effluent is stable and reaches the standard, and the treatment cost is low. The method can realize no discharge of enterprise wastewater, save water resource utilization, reduce enterprise industrial water consumption, reduce water environment pollution and guarantee water environment safety.

Description

Technical field [0001] The present invention relates to the field of wastewater treatment, in particular for fine chemical pharmaceutical intermediate wastewater treatment processes. Background technique [0002] The fine chemicals pharmaceutical intermediate wastewater and pharmaceutical wastewater are different. The present invention mainly treats diitrid, intermediate phenylenediamine fine chemical medical intermediate body wastewater, and its wastewater is characterized by complex ingredients, high organic content, large toxicity, color Deepening and high salin, especially poor biochemical, and COD concentrations up to 50,000 mg / L, biodegradability, high chromaticity. At the same time, the wastewater contains a large amount of sulfate, nitrate, nitrite, dinitrophenol sodium sodium and neighbor, and the salt content of nitrobenzol sodium, which is difficult to treat industrial wastewater. At present, domestic pharmaceutical intermediate waste juice is multiferigenic hydrolys...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a treatment process for fine chemical pharmaceutical intermediate wastewater, which has the advantages of low cost, anti-clogging and environmental protection, and solves the danger of waste salt produced by traditional evaporation and crystallization process for pharmaceutical intermediate high-salt wastewater Waste, a large amount of such waste salt is produced every year, and the disposal of these hazardous wastes will consume huge manpower, material and financial resources of the enterprise. Compared with the traditional evaporation and crystallization process, the four-effect strong circulation falling film evaporator does not produce crystallization salt, only produces The concentrated liquid is evaporated, and after the concentrated liquid is pyrolyzed and gasified, the organic matter in it is decomposed, leaving only inorganic salts. The four-effect strong circulation falling film evaporator does not form gas corrosion, and the device is not easy to crystallize. Concentrate the too dilute solution without crystallization, which prevents the blockage of the evaporator caused by crystallization, reduces the energy consumption during evaporation, and reduces the operating cost of evaporation; when the concentrated solution enters the pyrolysis device after evaporation, it has been concentrated and reduced In turn, the amount of pyrolysis is reduced, and the investment cost and operating cost of the pyrolysis section project are reduced. The heterogeneous catalytic oxidation uses a strong oxidant to catalyze and oxidize organic pollutants in wastewater at normal temperature and pressure, so that the COD removal efficiency is high, and the waste water can be improved. Biochemical properties, achieve the purpose of decolorization, and effectively increase the BOD / COD value. Compared with other advanced oxidation treatment processes, this method does not generate sludge, thereby reducing the cost of solid waste disposal. At the same time, the process has a good production environment and does not generate Foam

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