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Method for pre-treating wastewater from ultraviolet absorber production

A technology for the production of wastewater and absorbents, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. It can solve the problems of poor biodegradability, difficult treatment, and high concentration of organic matter. Achieve the effects of improved biodegradability, simple and reasonable process, and low processing cost

Inactive Publication Date: 2012-06-27
BLUESTAR LEHIGH ENG INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the wastewater produced by ultraviolet absorbers has high salinity, contains macromolecular heterocyclic phenols, high COD concentration, and poor biodegradability. It is a typical high-concentration organic acidic high-salt wastewater. High, COD is above 10,000 mg / L, and the wastewater mainly contains organic substances such as phenols, benzenes, alcohols, and amides
(2) The components contained in wastewater are biologically toxic or inhibitory, and their biodegradability is poor, so they cannot be directly treated by biochemical methods. At present, there is no suitable pretreatment method to improve the biodegradability of wastewater
(4) The concentration of discharged wastewater varies greatly
[0006] Ultraviolet absorber wastewater treatment has a high concentration of organic matter and is difficult to treat. At present, no effective low-cost pretreatment measures have been seen, which can greatly improve the biodegradability of wastewater after pretreatment and facilitate biochemical treatment.

Method used

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  • Method for pre-treating wastewater from ultraviolet absorber production
  • Method for pre-treating wastewater from ultraviolet absorber production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1, refer to figure 1 , a kind of ultraviolet absorber production wastewater pretreatment method, and its steps are as follows:

[0026] (1) First carry out oil separation and precipitation treatment on the wastewater to remove oil slicks and suspended solids contained in the wastewater;

[0027] (2) Pre-neutralize the wastewater treated by oil separation and precipitation, and adjust the pH value of the wastewater to 0.1 with lime emulsion or liquid alkali;

[0028] (3) The extraction process is used for treatment, and the extractant used in the extraction is HLE phenol-containing wastewater extractant; the weight ratio of extractant to wastewater during extraction is 4:1, and the extraction temperature is 0 °C; the extractant and wastewater pass through static pipelines After mixing by a mixer or mechanical stirring, the layers are layered in the extraction tower; the mixing time of the extractant and the wastewater is 5min; the layering time after the extract...

Embodiment 2

[0031] Example 2, refer to figure 1 , a kind of ultraviolet absorber production wastewater pretreatment method, and its steps are as follows:

[0032] (1) First carry out oil separation and precipitation treatment on the wastewater to remove oil slicks and suspended solids contained in the wastewater;

[0033] (2) Pre-neutralize the wastewater treated by oil separation and precipitation, and adjust the pH value of the wastewater to 4 with lime emulsion or liquid alkali;

[0034] (3) The extraction process is used for treatment, and the extractant used in the extraction is HLE phenol-containing wastewater extractant; the weight ratio of the extractant to the wastewater during extraction is 1:8, and the extraction temperature is 60 °C; the extractant and wastewater pass through static pipelines After mixing by a mixer or mechanical stirring, the layers are layered in the extraction tower; the mixing time of the extractant and the wastewater is 60min; the layering time after the...

Embodiment 3

[0037] Example 3, refer to figure 1 , a kind of ultraviolet absorber production wastewater pretreatment method, and its steps are as follows:

[0038] (1) First carry out oil separation and precipitation treatment on the wastewater to remove oil slicks and suspended solids contained in the wastewater;

[0039] (2) Pre-neutralize the wastewater that has been treated by oil separation and precipitation, and adjust the pH of the wastewater to 1 with lime emulsion or liquid alkali;

[0040](3) The extraction process is used for treatment, and the extractant used in the extraction is HLE phenol-containing wastewater extractant; the weight ratio of the extractant to the wastewater during extraction is 2:1, and the extraction temperature is 20 °C; the extractant and wastewater pass through static pipelines After mixing by mixer or mechanical stirring, the layers are layered in the extraction tower; the mixing time of the extractant and the wastewater is 10min; the layering time afte...

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Abstract

The invention relates to a method for pre-treating wastewater from ultraviolet absorber production. The method is characterized in that the method mainly comprises the treating processes of settling separated oil, pre-neutralizing, extracting, secondarily neutralizing and regenerating an extracting agent. According to the method, a HLE phenol-containing wastewater extracting agent is used for separating polycyclic phenols which are difficult to be biodegraded in the wastewater; after being regenerated, the extracting agent is reused; after the wastewater of UV-0 production is treated according to the method, the biodegradability is greatly increased; the B / C ratio of the treated discharge water is increased from the original 0.01-0.1 to 0.3-0.5; the total COD (Chemical Oxygen Demand) removing rate is above 40%; the guarantee is supplied to the subsequent biochemical treatment; and the method has the advantages of convenience in operation, and the treating cost is lower than that of the pre-treating technologies, such as evaporation salting, advanced wastewater oxidation, and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for pretreatment of wastewater produced by ultraviolet absorbers. Background technique [0002] Ultraviolet absorbers are highly efficient anti-aging additives that can absorb ultraviolet light of a certain wavelength. As an ultraviolet light stabilizer, they can delay the yellowing of materials and help reduce the loss of physical properties such as color and retardation. Therefore, it is widely used in the production of PE, PVC, PP, PS, PC, plexiglass, polypropylene fiber and ethylene, acetic acid, vinyl ester and other plastic materials. [0003] However, ultraviolet absorber production wastewater has high salinity, contains macromolecular heterocyclic phenols, high COD concentration, and poor biodegradability. It is a typical high-concentration organic acid and high-salt wastewater. Its pollution characteristics are as follows: (1) The concentration level ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/34
Inventor 杨志林王开春赵焰董自斌李学字袁丽娟
Owner BLUESTAR LEHIGH ENG INST CO LTD
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