Recycling treatment method for phosphate ester fire retardant waste water

A treatment method and flame retardant technology are applied in the field of resource treatment of phosphate ester flame retardant wastewater, which can solve problems such as difficult sludge treatment, achieve simple and easy-to-understand process and operation, mild reaction conditions, and easy industrialization. Effect

Active Publication Date: 2016-05-04
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process technology can make the wastewater discharge up to the standard, it will produce a large amount of difficult-to-treat sludge

Method used

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  • Recycling treatment method for phosphate ester fire retardant waste water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The pickling wastewater and alkali washing wastewater produced in the production workshop of flame retardant FR-220, the pickling wastewater mainly contains hydroquinone, phenol, toluene, a small amount of products, PO 4 3- 、H + , Mg 2+ And a little precipitation, the solid content is about 3.9%, the filtered wastewater COD is about 3800mg / L, H + The concentration is about 7.3mol / L, the total phosphorus concentration is about 9570mg / L; the alkali washing wastewater mainly contains toluene, a small amount of products, OH - And a little precipitation, the solid content is about 7.8%, the COD of the filtered wastewater is about 24000mg / L, the pH is 13~14, and the total phosphorus is about 970mg / L.

[0025] 1. Diffusion dialysis: The filtered pickling wastewater is treated by anion exchange membrane diffusion dialysis to obtain a concentrated acid solution (c(H + )=7.9mol / L) and dilute acid solution (c(H + )=0.54mol / L), the concentrated acid solution is reused in the p...

Embodiment 2

[0040] The pickling wastewater and alkali washing wastewater produced in the flame retardant BDP production workshop, the pickling wastewater mainly contains hydroquinone, phenol, toluene, a small amount of products, PO 4 3- 、H + , Mg 2+ And a little precipitation, the filtered wastewater COD is about 4300mg / L, H + The concentration is about 4.6mol / L, and the total phosphorus concentration is about 11660mg / L; the alkali washing wastewater mainly contains toluene, a small amount of products, OH - And a little precipitation, the COD of the filtered wastewater is about 171600mg / L, and the pH is 13~14.

[0041] 1. Diffusion dialysis: The filtered pickling wastewater is treated by anion exchange membrane diffusion dialysis to obtain a concentrated acid solution (c(H + )=5.2mol / L) and dilute acid solution (c(H + )=0.26mol / L), the concentrated acid solution is reused in the pickling section of the phosphate ester flame retardant production process. Anion exchange membrane diffu...

Embodiment 3

[0045] The pickling wastewater produced by the flame retardant FR-220 production workshop is mixed with the alkali washing wastewater produced by the flame retardant BDP production workshop.

[0046] 1. Diffusion dialysis: The filtered FR-220 pickling wastewater is treated by anion exchange membrane diffusion dialysis to obtain a concentrated acid solution (c(H + )=7.9mol / L) and dilute acid solution (c(H + )=0.54mol / L), the concentrated acid solution is reused in the pickling section of the phosphate ester flame retardant production process. Anion exchange membrane diffusion dialysis experimental parameters: number of membranes: 19 pairs; membrane size: 200mm*400mm; pipeline connection: waste acid enters from bottom to top, pure water (recovered acid) flows from top to bottom. The outlet pipe must be higher than the height of the membrane stack to discharge the air inside the membrane stack and avoid short flow.

[0047] 2. Wet oxidation: use the FR-220 dilute acid solution ...

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Abstract

The invention provides a recycling treatment method for phosphate ester fire retardant waste water. The phosphate ester fire retardant waste water comprises pickling waste water and alkaline waste water. The recycling treatment method is characterized by comprising the following steps: 1, diffusion dialysis: a step of subjecting the pickling waste water having undergone filtering to anion-exchange membrane diffusion dialysis so as to obtain a concentrated acid solution and a weak acid solution, wherein the concentrated acid solution is recycled and reused in the pickling procedure of a fire retardant production process; 2, wet oxidation: a step of adjusting the pH value of the alkaline waste water having undergone filtering to 3 to 11 by using the weak acid solution obtained in the step 1 and then carrying out wet oxidation on the alkaline waste water so as to obtain treatment fluid; and 3, adsorption: a step of adding an adsorbent in the treatment fluid obtained in the step 2, carrying out a stirring reaction, then carrying out filtering so as to obtain a filtrate and evaporating salt from the filtrate or directly discharging the filtrate having reached the standard. The method provided by the invention employs a combination of diffusion dialysis and wet oxidation for treatment of the phosphate ester fire retardant waste water, so the waste water is discharged after having reached the standard, acid in the pickling waste water is recycled, and production cost for the fire retardant is reduced.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a resource treatment method for phosphoric acid ester flame retardant wastewater. Background technique [0002] Phosphate ester flame retardants are the main series of phosphorus-containing flame retardants, which have dual functions of flame retardant and plasticizing. Used in textile, electronics, construction and other fields. During the production of phosphate ester flame retardants, a large amount of wastewater containing phosphate ester flame retardants will be produced. The wastewater is characterized by high COD and contains more insoluble and refractory organic matter (toluene, phenol, etc.), hydrochloric acid and total phosphorus. Phosphorus also contains a certain concentration of large molecular weight refractory organic phosphorus, which is highly toxic and refractory industrial wastewater. [0003] At present, the treatment methods of phosphate ester...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/36
CPCC02F1/28C02F1/44C02F1/66C02F1/725C02F9/00C02F2103/36
Inventor 吴小亮陈磊王烈昀程博陶旭东陈丽娜
Owner ZHEJIANG QICAI ECO TECH CO LTD
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