Distillation separation method for oily wastewater

Abstract

The invention discloses a distillation separation method for oily wastewater, which comprises the steps of vacuum evaporation, distillation treatment and condensation treatment, and pollutant concentration and pollutant discharge, wherein the vacuum evaporation is used for evaporating industrial wastewater in vacuum, and moisture in the wastewater is gasified into gas; the distillation treatment and the condensation treatment are used for distillating and separating the evaporated gas after being liquefied, and the separated water is distillated to obtain 90-95% of water through concentration and then is industrially recycled; the pollutants left after wastewater evaporation are concentrated so as to concentrate out 5-10% of waste; and the concentrated pollutants are discharged. Breakthrough zero liquid discharge and zero pollution are realized; and the treatment cost is reduced, and a clean water treatment process is used for producing clean water. According to the method disclosed by the invention, sewage discharge and recording in government departments are not needed, evaporation and concentration are carried out at a low temperature in a vacuum state, and the environmental design is safe, so that 24-hour fully automatic operation and an automatic cleaning function are realized.

Description

technical field [0001] The invention relates to the field of environmental protection treatment of industrial wastewater, in particular to a method for distillation and separation of industrial oily wastewater. Background technique [0002] The repetition rate of industrial water use is an important index for the construction of ecological cities in my country, and it is also a "green index" to measure the performance of local officials. It has been included in the mandatory industrial wastewater treatment standards in many economically developed areas; Under the increasingly urgent situation, the development trend of industrial wastewater treatment is to recycle water and pollutants as useful resources and implement closed loop. This can be divided into integrated recycling of water and pollutants, and separate recycling of water and pollutants. [0003] Structure: filtration system, heating distillation system, control system, cooling separation system, collection and disc...

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Problems solved by technology

[0005] Disadvantages: This technology is temporarily in the leading position in the world, and no obvious disadvantages have been found yet

[0006] Disadvantage: If solar and wind energy can be used for distillation, it will be more green and environmentally friendly

[0008] The random discharge of traditional 1T industrial wastewater will generate at least 2,000 yuan in environmental protection costs. For example, oily wastewater needs about 2,000-2,500 yuan / ton, or surface treatment needs 3,000-3,500 yuan / ton, and electroplating factories and other highly polluted liquids containing heavy metals It needs 3,500-4,000 yuan / ton, resulting in the cost of recovering 2,500 tons of oily liquid per year to exceed 5 million yuan. The cost is so expensive that it does not conform to the development trend of industrial wastewater treatment and cannot meet the important indicators of industrial water repetition rate.

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