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Method for treating phosphotriester flame retardant wastewater

A technology of phosphate triesters and flame retardants, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the flame retardant of tris(2-chloropropyl) phosphate The treatment of the total phosphorus in the waste water of the agent can not meet the discharge standard, the energy consumption is large, and the operation cost is high, and the removal effect is obvious, the equipment investment is small, and the operation is flexible.

Active Publication Date: 2011-02-23
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have the disadvantages of high operating cost and high energy consumption, and the total phosphorus treatment of tris(2-chloropropyl) phosphate flame retardant wastewater cannot meet the discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Pump phosphate triester wastewater into the catalytic oxidation inlet pool, add sulfuric acid to adjust the pH to 4; pass the obtained wastewater into a security filter to intercept suspended solids in the water; add 20% hydrogen peroxide to the obtained wastewater, the volume of wastewater and hydrogen peroxide The ratio is 50:1, then the waste water is pumped into the catalytic oxidation tower, the waste water and hydrogen peroxide are contacted and mixed with the fixed surface catalyst in the tower, and catalytic oxidation occurs, and the reaction time is 2h; the surface catalyst is 1% nitric acid by weight Copper aqueous solution and 5% manganese sulfate aqueous solution by weight impregnated activated carbon for 48 hours, dried, and then baked at 500 ° C to form; the obtained wastewater was passed into a biochemical distribution pool, and sodium hydroxide solution was added to adjust the pH to 7.5; the obtained wastewater was Pumped into the UASB+CASS biochemical sy...

Embodiment 2

[0026] Pump phosphate triester wastewater into the catalytic oxidation inlet pool, add sulfuric acid to adjust the pH to 5; pass the obtained wastewater into a security filter to intercept suspended solids in the water; add 20% hydrogen peroxide to the obtained wastewater, the volume of wastewater and hydrogen peroxide The ratio is 80:1, then the waste water is pumped into the catalytic oxidation tower, the waste water and hydrogen peroxide are contacted and mixed with the surface catalyst fixed in the tower, and catalytic oxidation occurs, and the reaction time is 1.5h; the surface catalyst is 1% by weight Copper nitrate aqueous solution and 4% manganese sulfate aqueous solution by weight impregnated activated carbon for 60 hours, dried, and then baked at 550 ° C to form; the resulting waste water was passed into a biochemical distribution pool, and the pH was adjusted to 8 by adding sodium hydroxide solution; the obtained The wastewater is pumped into the UASB+CASS biochemica...

Embodiment 3

[0028] Pump phosphate triester wastewater into the catalytic oxidation inlet pool, add sulfuric acid to adjust the pH to 6; pass the obtained wastewater into a security filter to intercept suspended solids in the water; add 20% hydrogen peroxide to the obtained wastewater, the volume of wastewater and hydrogen peroxide The ratio is 100:1, then the waste water is pumped into the catalytic oxidation tower, the waste water and hydrogen peroxide are contacted and mixed with the fixed surface catalyst in the tower, and catalytic oxidation occurs, and the reaction time is 2.5h; the surface catalyst is 5% by weight Copper nitrate aqueous solution and 1% manganese sulfate aqueous solution by weight impregnated the activated carbon for 72 hours, dried, and then baked at 550 ° C to form; the resulting waste water was passed into a biochemical distribution pool, and the pH was adjusted to 8 by adding sodium hydroxide solution; the obtained The wastewater is pumped into the UASB+CASS bioch...

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PUM

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Abstract

The invention discloses a method for treating phosphotriester flame retardant wastewater. The method comprises the following steps of: regulating the pH value of the wastewater to be between 4 and 6, adding hydrogen peroxide into the wastewater, and performing catalytic oxidation under the existence of a surface catalyst; introducing the wastewater into a biochemical distribution reservoir, and regulating the pH value to be between 7.5 and 8; pumping the wastewater into a biochemical system, and removing total phosphorus pollutants in the wastewater while organic pollutants in the wastewater are degraded; introducing the wastewater into a secondary settling tank, conveying settled sludge, introducing supernate into a phosphorous removal reaction tank, adding a coagulant and lime, and after fully reacting, introducing mixed solution into a phosphorous removal settling tank; and discharging the supernate which meets the standard, and conveying the sludge. The method is performed at normal temperature and normal pressure, has a mild reaction condition, high automaticity and small equipment investments and is easy and convenient to operate; and after effluent is subjected to biochemical treatment, chemical oxygen demand (COD) of the effluent reaches discharge standard completely, and the effluent is subjected to chemical phosphorous removal, so that the total phosphorous of the effluent reaches the discharge standard, the pollutants are reduced to an extremely low level, the chromaticity is reduced substantially, so that excellent environmental effect is achieved.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for treating waste water of phosphoric acid triester flame retardants. Background technique [0002] With the rapid development of the economy, the market demand for flame retardants is increasing, and the current consumption has become the second largest variety after plasticizers. In the process of flame retardant production, it is easy to produce a large amount of refractory organic pollution wastewater, causing environmental pollution and endangering people's health. Phosphate triester wastewater is one of them. This type of wastewater contains organic phosphorus substances and has a high content of organic matter. However, there are relatively few studies on this type of wastewater at home and abroad, and there are few corresponding treatment processes. At present, the main processes for treating this type of wastewater are still in the experimental and small-scale stag...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F9/14C02F1/72C02F1/66
Inventor 蒋伟群黄强高峰
Owner JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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