Waste water integrated treatment method of paraquat produced by cyanamideprocess

A treatment method and paraquat technology, applied in the field of integrated treatment of herbicide wastewater, can solve problems such as failure to recover useful substances, waste of resources, large investment, etc., and achieve the effects of reducing wastewater treatment costs, reducing pollution, and reducing pollutants

Active Publication Date: 2010-01-20
SHANDONG KEXIN BIOCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that this method has large investment and high cost
Moreover, the usefu

Method used

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  • Waste water integrated treatment method of paraquat produced by cyanamideprocess
  • Waste water integrated treatment method of paraquat produced by cyanamideprocess

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Recovery of Paraquat:

[0026] The paraquat content of the untreated paraquat wastewater is 0.12wt%, and the wastewater is directly added to the reactor at 25°C, and complexing agent DSD acid of different weights is added, stirred, and after the complexing agent absorbs paraquat, the wastewater is discharged into The cyanide-containing wastewater treatment device carries out the recovery in step 2). After the complex is press-filtered, the filtrate is mainly paraquat mother liquor, which can be processed into 20% paraquat water solution and sold as a product. See Table 1 for the recovery rates of paraquat at different dosages of complexing agents.

[0027] Table 1

[0028] DSD Acid: Wastewater

Embodiment 2

[0030] Recovery of cyanide ions:

[0031] Use SPAN80, E644, ENJ3029, blue-113 respectively as surfactant, get surfactant, liquid paraffin and kerosene according to the ratio of volume fraction 5%, 12% and 83% and be made into organic phase, place in the milk maker, After stirring evenly, slowly add NaOH solution (0.25mol / L) equal to the volume of organic matter, and stir at high speed for 20 minutes to make a white water-in-oil emulsion. Take 250ml of water sample to be treated with cyanide ion, put it in a separator, adjust the pH to 5-7 with HCl, add 20ml of the water-in-oil emulsion prepared above, stir at 200-300r / min for 8min, let it stand for stratification, and the upper layer It is an organic phase, and the lower layer is an aqueous solution, which is separated by clarification. The organic phase was demulsified by a high-voltage electrostatic demulsifier for 5 minutes, and separated into an oil phase and an aqueous phase. The upper layer is the organic phase (which ...

Embodiment 3

[0036] Recovery of ammonia from wastewater:

[0037] The content of ammonium chloride in the wastewater treated through steps 1), 2) is 14.35wt%, and 500g of the wastewater is first added to the exhaust gas preheater and the first-effect condensed water preheater for preheating, and then enters the first-effect evaporator , be warming up to 115 ℃, underpressure distillation, pressure is kept on-0.06MPa, when the concentration of ammonium chloride in the waste water is about 28wt%, enter the vapor-liquid separation of the first-effect separation chamber, and the raffinate of the first-effect evaporator is transferred to Two-effect evaporator, keep the temperature at 90°C, distill under reduced pressure, the pressure is -0.075MPa, distill until the concentration of ammonium chloride in the waste liquid is about 33wt%, stop the distillation, transfer the waste liquid to the crystallization tank and cool to 25°C crystallization. The raffinate and ammonium chloride crystals are se...

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Abstract

The invention discloses a waste water integrated treatment method of paraquat produced by cyanamideprocess, belonging to the technical field of waste water treatment. In the method, complexing agent is used for coordinately separating and recovering paraquat in waste water, a liquid membrane extraction method is used for recovering cyanide ions, double-effect distillation is used for recovering salt in the waste water, an incinerator is used for incinerating residual liquid, etc. The method has good treatment effect, high recovery rate, and can realize recycling usage of paraquat waste water resource of cyanamideprocess technique, lower pollutant in the waste water, reduce environmental pollution and lower the waste water treatment cost for paraquat manufacturing enterprises.

Description

technical field [0001] The invention relates to an integrated treatment method for herbicide wastewater, belonging to the technical field of wastewater treatment. Background technique [0002] Paraquat is the second largest herbicide in the world, and its demand is increasing. A major breakthrough has been made in the production process of ammonium cyanide in China. The process has many advantages and is highly competitive in the market. However, the problem of wastewater treatment in the synthesis process has not been completely resolved. The waste water produced during the production process of ammonium cyanide paraquat contains a part of paraquat products, and has high cyanide content, high chemical oxygen demand (COD) and high salt content. It is difficult to remove by general methods. [0003] The treatment of paraquat wastewater in foreign countries mainly adopts the measures of first distillation of wastewater and incineration of high-concentration wastewater, that ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C07D213/22C01C3/14C01C1/16C02F1/44C02F1/26C02F1/04C02F103/36
CPCY02P20/10
Inventor 李德军李旭坤马绍田刘军刘伟华王明刚刘伟
Owner SHANDONG KEXIN BIOCHEM
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