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High-concentration organic waste water evaporating and concentration processing method

An organic wastewater, evaporation and concentration technology, applied in the direction of heating water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low separation efficiency and high COD of wastewater, and achieve high organic content and concentration The effect of high multiple and reduction of incineration cost

Active Publication Date: 2014-01-01
惠州TCL环境科技有限公司
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Problems solved by technology

[0004] The traditional multi-effect evaporation and concentration system can effectively reduce the energy consumption of evaporation, but it also has the following disadvantages: using a gas-liquid separator to separate evaporated organic matter and water is equivalent to a theoretical plate of a fractionation tower, and its separation efficiency is low. Due to the high concentration of organic matter and serious entrainment phenomenon, the separation efficiency is lower, which leads to high COD of the distilled wastewater, and the obtained distilled water needs further biochemical or physicochemical treatment before it can be discharged up to the standard.

Method used

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Embodiment 1

[0026] Implementation example 1: A kind of equipment cleaning wastewater in the organic solvent industry, with COD as high as 150,000mg / L, containing 6.2% organic matter (such as toluene, xylene, ethyl acetate and other organic matter).

[0027] After the above wastewater is treated by the method of the present invention, 15 parts of concentrated liquid can be obtained from 100 parts of organic wastewater, and the remaining 85 parts are distilled water, and the organic matter content is less than 0.1% (COD: 120mg / L). During subsequent treatment, the concentrated liquid that needs to be incinerated at high temperature is reduced by 85%; the COD of distilled water is very low, and the oxidative degradation is also very fast and easy, so it has a good economic prospect. The specific waste water inflow and outflow are as follows:

[0028]

Embodiment 2

[0029] Implementation example 2: Treatment of alkali slag wastewater in oil refineries In the process of petroleum refining and processing, an alkali washing process is usually used to remove sulfides in oil products. Various alkali slag wastewater of organic matter. In this example, the source of sewage is catalytic diesel alkali residue wastewater from an oil refinery, in which COD is 135600mg / L, sulfide is 12965mg / L, volatile phenol is 9765mg / L, and naphthenic acid is 4.5%.

[0030] After the above-mentioned alkali slag waste water is through settling and filtering, after being processed by the method of the present invention, the result is as follows

[0031] surface:

[0032]

[0033] After the treatment, the volume of the concentrated liquid to be incinerated is reduced by 82%, and the COD of the distilled water is reduced to 570mg / L.

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Abstract

The invention discloses a high-concentration organic waste water evaporating and concentration processing method. A combination of a multi-effect evaporator and a fractionating tower is used for efficient separation of organic matter and water. Feeding waste water is preheated through countercurrent flow and efficient utilization of heat is achieved. The method is especially suitable for waste water which has high organic concentration (COD is larger than or equal to 20000mg / L) and complicated components and is hard to degrade biochemically. Organic waste water is deposited, filtered, preheated and evaporated in a multi-effect mode and undergoes fractional distillation, so that the organic matter concentration of obtained water is quite low (COD is smaller than or equal to 1000mg / L). Compared with traditional multi-effect evaporation and concentration, the efficient utilization of heat is achieved, the organic matter concentration of distilling water outlet is obviously reduced, and therefore the loads for biologically processing follow-up distilled water are relieved and the follow-up procedure of processing the distilled water is avoided. Emission reaching the standard is directly performed.

Description

technical field [0001] The invention relates to a method for treating high-concentration organic wastewater, in particular to a method for treating high-concentration organic wastewater by evaporation and concentration. Background technique [0002] In the printing and dyeing industry, circuit board industry, electroplating industry, oil refining industry or other organic chemical industries, high-concentration organic wastewater (or waste liquid) is often produced. The COD concentration of these organic wastewater is very high, COD≧20000mg / L, even Up to 200000mg / L. In addition, it often contains some alkaline substances and dissolved salts (TDS: 1-8%). Such as developing and stripping bath liquid in circuit board industry, reactor cleaning wastewater in rubber and plastic industry, production waste liquid in organic solvent industry, alkali slag waste liquid produced in oil refinery, etc. [0003] For this kind of organic waste liquid, if biological treatment is used for ...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F101/30
Inventor 王治军王九飙张井峰
Owner 惠州TCL环境科技有限公司
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