System and method for resourceful treatment of high-salt organic wastewater

Abstract

The invention discloses a system and a method for resourceful treatment of high-salt organic wastewater. The system comprises five units, namely a raw water concentration unit, an atomization pyrolysis unit, a sodium sulfate purification unit, a hydrochloric acid recovery unit and a tail gas treatment unit. The raw water concentration unit is used for concentrating the high-salt organic wastewater; the atomization pyrolysis unit is used for adding an acidifying agent into the concentrated solution for acidifying, adding an oxidizing agent at the same time, thoroughly oxidizing and removing organic matters in water through atomization pyrolysis, and separating to obtain hydrogen chloride gas and sodium sulfate mixed salt; the sodium sulfate purification unit is used for dissolving the separated sodium sulfate mixed salt, removing impurities, evaporating and crystallizing, and purifying sodium sulfate through recrystallization; the hydrochloric acid recovery unit is used for filtering and condensing the separated hydrogen chloride gas and recovering hydrochloric acid; and the tail gas treatment unit is used for deacidifying and purifying residual tail gas of the hydrochloric acid recovery unit. According to the system and the method, organic matters in the high-salinity wastewater can be efficiently removed, and hydrochloric acid and sodium sulfate crystalline salt can be recycled; the resourceful treatment of the high-salt organic wastewater is realized, and the method has a relatively good application prospect.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a treatment system and method for organic wastewater, in particular to a system and method for resource-based treatment of high-salt organic wastewater. Background technique [0002] Iron and steel, coal chemical, petrochemical, coal power, nonferrous metallurgy, fine chemical, pharmaceutical and other heavy polluting enterprises not only consume a lot of water resources, but also have a high intensity of sewage discharge. In order to cope with the dual pressures from water resources and the environment, many enterprises have adopted membrane concentration technology to carry out zero-discharge transformation of wastewater treatment systems. High salt content, also contains refractory organic matter. In order to reduce the amount of high-concentration brine, some enterprises crystallize the salt in the wastewater by simply evaporating to dryness. The main c...

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Problems solved by technology

[0006] Aiming at the problem that the existing technology cannot realize the high-efficiency treatment of high-salt organic wastewater and the recycling of waste salt, the present invention provides a system and method for resource-processing of high-salt organic wastewater, which can realize high-salt Complete removal of organic matter in wastewater; at the same time, this method can recover high-purity sodium sulfate and hydrochloric acid, and realize the harmless and resourceful disposal of high-salt organic wastewater

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