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Method for treating atrazine-containing pesticide wastewater

A technology of pesticide wastewater and treatment method, applied in heating water/sewage treatment, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., to reduce environmental pollution, ensure safety, high economic and environmental benefits

Active Publication Date: 2011-10-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biochemical effluent still contains low-concentration pesticide characteristic pollutants, which will still be discharged into the external environment, and the pollution problem of pesticide wastewater has not been fundamentally solved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The water quality of pesticide wastewater is shown in Table 1.

[0030] Table 1 Pesticide water quality analysis data

[0031] pH

COD (mg / L)

Alkalinity (mmol / L)

Cl - (chloride) (mg / kg)

Total Salt Content (mg / L)

Atrazine (mg / L)

11～12

2260

24.75

5180

55400

15.23

[0032] The pH of the wastewater is 11-12, neutralized with hydrochloric acid to pH 7-8, it can be seen that it is obviously turbid, and flocculent substances are slowly precipitated. After standing still, there are flocculent precipitates, and the upper water layer is relatively turbid. Dosing polyaluminum chloride and polyacrylamide, the dosage is 50mg / L and 2mg / L respectively, the coagulation effect is remarkable, obvious large flocs appear within ten minutes after adding the coagulant, passing through 0.5~ 2.0mm zeolite filter material for filtration.

[0033]Water was filtered off and evaporated under reduced pressure. Results of vacuum evaporatio...

Embodiment 2

[0035] Waste water quality condition is the same as embodiment 1. The waste water is directly evaporated under reduced pressure after being neutralized. Evaporation results under reduced pressure: COD before evaporation: 2207mg / L; COD of evaporated water: 49.1mg / L. Evaporation phenomenon: severe bumping phenomenon, entrainment phenomenon, and obvious white salt precipitation in the evaporation kettle. From the phenomenon of evaporation process, for the pesticide wastewater with high concentration, bumping and entrainment phenomenon existed in the direct evaporation after neutralization, indicating that the existence of suspended matter has an impact on the evaporation process. Atrazine content before distillation: 11.15mg / L; atrazine content in distilled water: 4.78mg / L.

Embodiment 3

[0037] Water evaporated in Example 2 was carried out for adsorption test, and the adsorption medium used granular activated carbon and columnar activated carbon respectively. The adsorption device adopts a glass column with an inner diameter of 50mm and a height of 200mm, and adopts the form of downward flow. Every 200mL, an adsorption water is taken, which are respectively recorded as adsorption 1, adsorption 2 and adsorption 3. The results are shown in Table 2.

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Abstract

The invention relates to a method for treating atrazine-containing pesticide wastewater, which is characterized by comprising: pumping pesticide wastewater into a neutralization pool; adding inorganic acid to regulate pH between 7 and 8; allowing the obtained product to enter a coagulation-sedimentation pool; putting in coagulant for coagulation; allowing the obtained product to enter a sand filter; performing filtration; allowing the obtained product to enter a reduced-pressure evaporation system of a water-collecting pool; discharging condensate which is repeatedly evaporated and concentrated and then is subjected to activated carbon adsorption into a recycled-water storage pool; allowing reactor-bottom residual liquid of evaporated and concentrated under reduced pressure to enter a salting-out tank and cooling the reactor-bottom residual liquid to form salt; and periodically transporting salt slag to a solid waste treatment plant for final treatment. The method has the advantages of realizing the zero wastewater discharge of pesticide production processes, performing safe disposal on solid pollutants, ensuring environmental safety, effectively solving the problem that the wastewater produced during pesticide production is difficult to treat, saving a large amount of cost for pollution discharge, reducing environmental pollution and having high economic and environmental benefit.

Description

Technical field: [0001] The invention relates to a method for treating pesticide wastewater with high salt content, in particular to a method for treating pesticide wastewater containing atrazine. Background technique: [0002] my country is a big country in the production and use of pesticides, and its annual output ranks second in the world. Due to the characteristics of small water volume, high concentration of pollutants, serious pollution, and great harm, pesticide wastewater has the characteristics of high salt content, so it is difficult to meet the standard through conventional physicochemical and biochemical methods. The discharge of these waste waters into rivers not only seriously damages the ecology of water bodies, but also poses a great threat to the living environment of human beings. How to effectively solve the problem of purification and treatment of such high-concentration organic wastewater has become a major problem to be solved urgently in the field of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/66C02F1/52C02F1/04C02F1/28
Inventor 赵纯宁艳春蒲文晶吕继萍徐育烨吕利民庄立波耿长君钟大辉
Owner PETROCHINA CO LTD
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