A high-salt and high-concentration organic waste liquid treatment process

Abstract

The invention discloses a processing technology of high-salt high-concentration organic waste liquid. The processing technology comprises the following steps of: (1) the feeding quantity of materials is controlled through a frequency changer, the materials enter a distilling tower from a preheater for atmospheric distillation, light components are condensed through a light-component condenser, and heavy components enter a three-effect evaporating system consisting of three heaters for evaporation and separation; (2) vapor-liquid mixtures generated by the heaters in the three-effect evaporating system respectively enter separators, light components which are demisted by a demister are condensed, and organic components are led into a tail gas system or are exhausted; (3) secondary vapor obtained after three-effect forced circulatory evaporation and concentration enters a condenser to be condensed, partial discharged concentrated liquid enters a reaction kettle, and partial discharged concentrated liquid enters an incineration plant to be incinerated, and heat values are reclaimed. According to the processing technology disclosed by the invention, a system is good in stability; the processing technology is high in adaptability; a forced circulatory evaporation technology is adopted, so that the heat exchanging efficiency is high; two-stage demisting realizes a good demisting effect, and scale formation is postponed.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a high-salt and high-concentration organic waste liquid treatment process. Background technique [0002] In recent years, with the development of industrial and agricultural production and the improvement of urban people's living standards, the discharge of industrial wastewater and urban sewage is increasing. The resulting environmental pollution has seriously affected environmental ecology and human health, especially high-salt Discharge of high-concentration organic wastewater. High-concentration salt-containing organic waste liquid refers to high-concentration organic waste water containing at least 3.5% total dissolved solids TDS (Total Dissolved Solid), which mainly comes from industrial production processes such as chemical industry and mechanical processing. High-concentration salt-containing organic waste liquid not only contains a high concentratio...

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Problems solved by technology

[0003] High-concentration salt-containing organic waste liquid has high salt content and high-concentration organic matter exists in emulsified form, which has brought great obstacles to its treatment. Facing increasingly stringent environmental protection requirements, a single treatment method is economically and technically difficult. There are certain problems

The incineration method is currently the most commonly used treatment method, but due to the high water content in the waste liquid, more fuel is required, resulting in high operating costs; the deep oxidation method among the physical and chemical methods occupies a relatively small area , there is basically no secondary pollution after treatment, but difficult control conditions and high operating costs restrict its popularization and application; membrane separation and biological methods are difficult to apply alone due to the pollution characteristics of high-concentration salt-containing organic waste liquid

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