Treatment method of PMIDA wastewater produced by using IDA method

A bisglyphosate and wastewater technology, applied in natural water treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc., can solve the problems of increasing wastewater discharge and treatment volume, and achieve improved oxidation efficiency and mild reaction conditions , the effect of high degree of automation

Active Publication Date: 2015-06-03
JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. The TDS concentration of the secondary washing water is still 30,000mg/L. Using the traditional activated slu

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Pump the condensate of diglyphosate mother liquor by IDA method into the alkaline condensation tank, add quicklime and alkaline reagents to adjust the pH to 10, heat up to 50°C with steam, and the reaction time is 2 hours. 8g of quicklime is added to the mother liquor condensate; the obtained wastewater and lime are passed into the sedimentation tank together, the supernatant is discharged for use, and the lime is collected and used in the alkaline condensation tank.

[0042] Pump the secondary washing water of diglyphosate by IDA method into the iron-carbon micro-electrolytic cell, add acidic reagents to adjust the pH to 1; add alkaline reagents to the obtained wastewater to adjust the pH to greater than 7, then add coagulant, and add 5 mg of coagulant per 1 L of wastewater The supernatant is discharged into the coagulation sedimentation tank, the supernatant is discharged, and the sludge is transported outside for treatment. The supernatant is passed into the catalytic ...

Embodiment 2

[0045] Pump the condensate of diglyphosate mother liquor by IDA method into the alkaline condensation tank, add quicklime and alkaline reagent to adjust the pH to 11, heat up to 55°C with steam, and the reaction time is 2.5. 10g of quicklime is added to the mother liquor condensate; the obtained waste water and lime are passed into the sedimentation tank together, the supernatant is discharged for use, and the lime is collected and used in the alkaline condensation tank.

[0046] Pump the secondary washing water of bisglyphosate by IDA method into the iron-carbon micro-electrolytic cell, add acid reagent to adjust the pH to 2; The supernatant is discharged into the coagulation sedimentation tank, the supernatant is discharged, and the sludge is transported outside for treatment. The supernatant is passed into the catalytic water inlet tank, and the acidic reagent is added to adjust the pH to 5. The obtained wastewater is added with hydrogen peroxide with a concentration of 20-3...

Embodiment 3

[0049] Pump the condensate of diglyphosate mother liquor by IDA method into the alkaline condensation tank, add quicklime and alkaline reagents to adjust the pH to 12, heat up to 60°C with steam, and the reaction time is 3 hours. 12g of quicklime is added to the mother liquor condensate; the obtained waste water and lime are passed into the sedimentation tank together, the supernatant is discharged for use, and the lime is collected and used in the alkaline condensation tank.

[0050] Pump the secondary washing water of diglyphosate by IDA method into the iron-carbon micro-electrolytic cell, add acid reagent to adjust the pH to 3; The supernatant is discharged into the coagulation sedimentation tank, the supernatant is discharged, and the sludge is transported outside for treatment. The supernatant is passed into the catalytic water inlet tank, and the acid reagent is added to adjust the pH to 6. The obtained wastewater is added with hydrogen peroxide with a concentration of 20...

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Abstract

The invention discloses a method for PMIDA wastewater produced by using an IDA method. The method comprises the following steps: regulating pH of wastewater of PMIDA mother liquid condensate to be 12 by using quick lime and liquid caustic soda; introducing steam and heating to be at 50-60 DEG C; performing alkali condensation and introducing into a biological water distributing tank; regulating pH of secondary washing water to be 1-3 and performing a micro-electrolytic reaction; adding hydrogen peroxide and performing catalytic oxidization in the presence of a surface catalyst; regulating pH to be 7.5-8; pumping wastewater into a biochemical system; using a strain which can be tolerant to 1-3 percent of salinity; degrading organic pollutants by using an ABR anaerobic I/continuous aerobic I/ABR II/continuous aerobic II method and simultaneously turning organophosphorus into orthophosphate; precipitating sludge and transporting outwards; enabling liquid supernatant to flow into a phosphorous removal reaction tank; adding coagulants and lime to be fully subjected to reaction to enable mixed liquid to flow into a phosphorous removal precipitation tank; enabling the liquid supernatant to reach the discharge standard; transporting outwards the sludge. The method is low in operation cost; effluent water is subjected to biochemical treatment so that COD completely reaches the discharge standard; after chemical phosphorous removal, the total phosphorous reaches the discharge standard, so that the pollutants are reduced to the lowest level, the chromaticity is greatly reduced, and the method has a good environmental effect.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a method for treating diglyphosate wastewater by IDA method. Background technique [0002] The production process of diglyphosate by IDA method is to prepare iminodiacetic acid by hydrolyzing diacetonitrile under alkaline conditions. Iminodiacetic acid, hydrochloric acid, phosphorous acid, and formaldehyde are condensed in a reaction kettle, then cooled, crystallized, filtered, and dried to obtain the product. [0003] The waste water produced by the production process of diglyphosate is mainly after the condensation reaction of iminodiacetic acid and phosphorous acid to produce insoluble diglyphosate product. Because the product contains a variety of raw materials and side reaction products, diglyphosate needs to be washed three times, the first washing water is used as the diglyphosate mother liquor, and the wastewater from the second and third washing is used as the secondary wash...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F103/36
Inventor 高峰李志涛蒋伟群王伟姜伟东丁红丹史超群
Owner JIANGSU LASON CHEM ENVIRONMENTAL PROTECTION
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