Treatment method for paraquat pesticide wastewater

A technology for pesticide wastewater and a treatment method, which is applied in the field of paraquat pesticide wastewater treatment, can solve the problems of long reaction time, high equipment requirements, and high operational danger, and achieves the effects of saving treatment costs, simple operation, and short process flow

Active Publication Date: 2014-12-10
ZHEJIANG QICAI ECO TECH CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used methods are: biochemical treatment, incineration, super oxidation, etc.: biochemical treatment generally requires long-term domestication of microorganisms, and the effect is unstable. Many pesticides cannot be completely decomposed, and some microorganisms will convert them into more difficult and more toxic pesticides. The product of the incineration method is harsh, the cost is too high, and it is easy to leak toxic and harmful gases; super oxidation requires high equipment, so the cost is high, and the operation risk is relatively high, so it is difficult to popularize
[0003] Some enterprises use activated sludge method combined with incineration method to treat paraquat wastewater (Zhang Yongmei, etc.), and the estimated cost is about 2,000 yuan/ton of wastewater; some enterprises use catalytic oxidation method (CN 1576242A), adding catalyst to wastewater, at 100-200 ℃, 0.9-1.5MPa under the conditions of reaction for 12-24 hours, the removal rate of COD is higher than 90%, the removal rate of cyanide is almost

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Examples

Experimental program
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Effect test

Embodiment 1

[0023] Paraquat pesticide wastewater (COD=65200 mg / L, NH3-N content is 89930 mg / L, CN - content=1100 mg / L, pH=10-12), add hydrochloric acid with a mass concentration of 36-38% to adjust the pH to 10, add 5% activated carbon of the wastewater mass, and after 2 hours of ozone oxidation reaction, add 10% of the wastewater mass Hydrogen peroxide (mass concentration: 50%), continue to oxidize for 6 hours. During the reaction process, the pH was adjusted online to stabilize the pH of the system at about 9. Immediately add 2% hydrogen peroxide (mass concentration: 30%) to the wastewater after oxidation and stir and mix for 0.5 hours. The filtrate obtained by filtering is clear light orange red, and the filtrate COD removal rate is about 75%. Concentrate and crystallize the filtrate to obtain a slightly yellowish salt, wash it once with 20% saturated washing liquid, and obtain qualified industrial salt. The concentrated condensate is clear and transparent, with COD=80 mg / L and amm...

Embodiment 2

[0025] In this example, paraquat wastewater (COD=65200 mg / L, NH3-N content is 89930 mg / L, CN - Content = 1100mg / L, pH = 10-12) add hydrochloric acid (36-38%wt) to adjust the pH to about 5, add diatomaceous earth with 5% of the wastewater quality, and the rest of the treatment methods are the same as in Example 1. The wastewater after the oxidation treatment is filtered to obtain a clear reddish-brown filtrate, and the filtrate COD removal rate is 57%; the filtrate is concentrated and crystallized to obtain dark red salt, which is washed twice with 30% saturated solution to obtain qualified industrial salt; The concentrated condensate is clear and slightly red, with COD=340 mg / L and ammonia nitrogen less than 35 mg / L.

Embodiment 3

[0027] In this example, paraquat wastewater (COD=65200 mg / L, NH3-N content is 89930 mg / L, CN - Content = 1100mg / L, pH = 10-12) add hydrochloric acid (36-38%wt) to adjust the pH to about 7, add 0.1% activated carbon of the wastewater quality, and the remaining treatment methods are the same as in Example 1. After the oxidation, the waste water was filtered to obtain a clear black-red filtrate, and the filtrate COD removal rate was 66%. The filtrate was concentrated and crystallized to obtain gray-red salt, which was washed twice with 40% saturated solution to obtain qualified industrial salt. The condensate obtained by concentration is clear and slightly yellow, with COD=80 mg / L and ammonia nitrogen about 100 mg / L.

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Abstract

The invention discloses a treatment method for paraquat pesticide wastewater, and belongs to the technical field of treatment of the three wastes. The treatment method comprises the following steps: carrying out ozone oxidization, concentration and crystallization, and salt-leaching, introducing ozone for 1-2 hours after adding an adsorbent to completely oxidize cyanides; adding hydrogen peroxide to promote ozone oxidization speed, adding less hydrogen peroxide and then keeping the color of the mixture stable after the oxidization is ended, filtering to remove waste residues, and directly concentrating the obtained wastewater, rinsing the obtained salt with less washing water to reach industrial salt standards. The treatment method is applied to treating the paraquat pesticide wastewater, is relatively low in treatment cost, low in equipment requirement, low in operation cost, great in value of recycled salts and suitable for wastewater treatment of small and medium-sized enterprises.

Description

technical field [0001] The invention relates to a treatment method for paraquat pesticide wastewater, belonging to the technical field of three wastes treatment. Background technique [0002] With the rapid development of agriculture, the types and amounts of pesticides are also increasing rapidly. At this stage, most of the pesticides used in my country are organic pesticides, many of which are highly toxic and difficult to decompose. Pesticide wastewater has become a major problem in the field of water treatment. . Currently commonly used methods are: biochemical treatment, incineration, super oxidation, etc.: biochemical treatment generally requires long-term domestication of microorganisms, and the effect is unstable. Many pesticides cannot be completely decomposed, and some microorganisms will convert them into more difficult and more toxic pesticides. products; the incineration method requires harsh conditions, the cost is too high, and it is easy to leak toxic and har...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01C1/16
Inventor 张仲平张毅
Owner ZHEJIANG QICAI ECO TECH CO LTD
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