Treatment process of high-salt and high-organic-matter wastewater

Abstract

The invention relates to a treatment process of high-salt and high-organic-matter wastewater. The high-salt and high-organic-matter wastewater firstly passes through a sedimentation tank and then passes through a regulating tank, acid or alkali liquor is added to regulate the pH value in the water to be 7-9, low-boiling-point organic matters are evaporated through pre-evaporation, the low-boiling-point organic matters in the wastewater are evaporated, and the concentration of the obtained low-boiling-point organic matters is between 5% and 95%. The wastewater from which the organic matters with low boiling points are evaporated enters evaporation crystallization, and salt in the wastewater is crystallized. The crystallized salt enters pyrolysis again, the organic matters entrained in the salt are converted into carbon dioxide and water, the pyrolyzed salt can meet the industrial requirement, meanwhile, heat is recovered, and the pyrolyzed salt can be used for heat consumption of pre-evaporation. According to the process, organic matter components in the wastewater can be efficiently removed according to the boiling point of the organic matters, salt is separated through evaporativecrystallization, the evaporated water is recycled, and zero discharge of the wastewater is realized.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment process for wastewater with high salt and high organic matter. Background technique [0002] High-salt and high-organic wastewater is a common type of difficult-to-treat wastewater, generally referring to wastewater with a total salt content of at least 1%. High organic content and complex composition, COD Cr (Chemical oxygen demand) concentration is generally above 10000mg / L, and also contains a large amount of refractory organic pollutants. Due to the high salt content and the inhibitory effect of high salinity on microorganisms, it is difficult to achieve the expected treatment effect by direct biological methods. In addition, it contains a high content of organic matter, and some of the organic matter has a lower boiling point than water, while some organic matter has a higher boiling point than water, making it even more difficult to treat effectiv...

AI Technical Summary

Problems solved by technology

Due to the high salt content and the inhibitory effect of high salinity on microorganisms, it is difficult to achieve the expected treatment effect by direct biological methods

In addition, it contains a high content of organic matter, and some of the organic matter has a lower boiling point than water, while some organic matter has a higher boiling point than water, making it even more difficult to treat effectively

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