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Treatment technology of phosphorus fire retardant wastewater

A phosphorus-based flame retardant and treatment process technology, which is applied in the field of phosphorus-based flame retardant wastewater treatment process, can solve the problems of high treatment cost and poor treatment effect of organic phosphorus wastewater, and achieve low operating cost and compact evaporation equipment , strong practical effect

Inactive Publication Date: 2018-10-02
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although this method has an obvious effect on the treatment of phosphorus-containing wastewater with a general concentration, it has a poor treatment effect on high-concentration organic phosphorus wastewater, and there is a problem of high treatment cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The treated wastewater is the production wastewater of alkyl phosphinate flame retardants. The wastewater quality is as follows: COD concentration is 14255mg / L, TOC is 3194mg / L, TP (total phosphorus) is 5450mg / L, pH is 1.70, and contains salt Amount of 8.3% (mainly sodium sulfate).

[0032] The treatment process is as follows:

[0033] (1) Use 30wt% sodium hydroxide solution to adjust the pH of the waste water to 5.03, take the quality of total phosphorus in the waste water as a benchmark, add 1.0% iron sulfate, and stir for 120 min at 35°C to make the waste water fully react. , carry out suction filtration on the waste water, the suction filtration speed is 5.66m 3 / (m 2 h), obtain filtrate I;

[0034] The water quality of filtrate I is as follows: COD concentration is 1642mg / L, TOC is 313mg / L, TP is 535mg / L, pH is 2.49;

[0035] (2) Adjust the pH of the filtrate I to 8.22, stir at room temperature for 30 minutes, and carry out flocculation. After the flocculation ...

Embodiment 2

[0042] The treated wastewater is the production wastewater of benzene-based phosphinate flame retardants. The wastewater quality is as follows: COD concentration is 27500mg / L, TOC is 7340mg / L, TP (total phosphorus) is 4780mg / L, pH is 1.70, and contains salt Amount of 15.3% (mainly sodium sulfate).

[0043] The treatment process is as follows:

[0044] (1) Use 30wt% sodium hydroxide solution to adjust the pH of the wastewater to 5.9, take the quality of total phosphorus in the wastewater as a benchmark, add 2.0% ferric chloride, and stir for 120min at 35°C to make the wastewater react fully and completely Afterwards, the waste water is suction filtered, and the suction filtration speed is 4.46m 3 / (m 2 h), obtain filtrate I;

[0045] The water quality of filtrate I is as follows: COD concentration is 3220mg / L, TOC is 760mg / L, TP is 335mg / L, pH is 2.49;

[0046] (2) Adjust the pH of the filtrate I to 8.22, stir at room temperature for 30 minutes, and carry out flocculation, ...

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Abstract

The invention discloses a treatment technology of phosphorus fire retardant wastewater, which comprises the following steps of: (1) regulating a pH (potential of hydrogen) of the phosphorus fire retardant wastewater to 2-9, adding soluble ferric iron salt for stirring and filtration to form filtrate I, (2) neutralizing and flocculating the filtrate I to separate and remove a sediment to form filtrate II, and (3) performing evaporation, concentration, crystallization and desalination on the filtrate II, directly discharging or recycling an evaporative condensate, and allowing concentrated liquid to directly return to step (1) for re-treatment. The treatment technology is applicable to continuous treatment of the phosphorus fire retardant wastewater, adopts dosing pretreatment-neutralizationand flocculation-evaporative condensation as a main line, is simple to operate and low in cost and can achieve zero discharge of the phosphorus fire retardant wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a process for treating phosphorus-based flame retardant wastewater. Background technique [0002] As synthetic materials are widely used in people's daily life and national economic construction, the flame retardant treatment of their polymers has attracted more and more attention. Although halogenated flame retardants have unparalleled high efficiency compared with other flame retardants, their harm to the environment and people cannot be ignored. In recent years, alkyl phosphinate flame retardants have become the main Research has become one of the hot spots in the development of phosphorus flame retardant industry. [0003] Aluminum diethylphosphinate [(C 2 h 5 C 2 h 5 P(O)O) 3 Al] has the advantages of small particle size, high whiteness, good thermal stability, and non-toxicity. It is widely used in the flame retardancy of thermoplastics, thermosetting plastics, fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/34C02F103/36
CPCC02F1/001C02F1/04C02F1/041C02F1/52C02F1/56C02F1/58C02F1/66C02F9/00C02F2001/5218C02F2101/34C02F2103/36C02F2301/08
Inventor 黄国龙楼银川付玲玲何靖锋
Owner ZHEJIANG QICAI ECO TECH CO LTD
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