Paraquat pesticide wastewater treatment process

A technology for treating process and pesticide wastewater, applied in the directions of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of improving the efficiency of oxidative decomposition, avoiding safety problems, and saving the amount of alkali used.

Inactive Publication Date: 2014-12-24
HUBEI XIANLONG CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature and effective industrialized treatment method for the wastewater produced in the production process of paraquat at home and abroad.
This waste ice contains many toxic and harmful pollutants such as CN- and benzene ring substances. The waste water has high pollutant concentration, high salt content, high chroma and high toxicity, which has a strong toxic effect on microorganisms and poor biodegradability. High concentration, refractory organic pesticide wastewater
[0003] At present, the treatment method of paraquat wastewater in China is mainly incineration, which consumes a lot of energy and costs high, and at the same time produces a large amount of waste residue, which increases the cost of incineration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Use the company's paraquat wastewater as the water to be treated (CN- content 25000ppm, pH 11), the specific treatment process steps are as follows:

[0016] 1) Oxidation: 10000L of paraquat wastewater in the waste water pool is sent to the oxidation kettle by centrifugal pump, and 0.5Kg catalyst is added, the catalyst is an oxide with active carbon as the carrier, and the oxide is aluminum peroxide, copper peroxide The mixture, wherein aluminum peroxide: copper peroxide = 1:3; open the steam valve to heat, control the pressure to 5MPa, control the temperature to 220°C, and cool down to 60°C after 5 hours of reaction;

[0017] 2) Stripping: the oxidized waste water is sent to the ammonia nitrogen stripping tower by a centrifugal pump, adding alkali to adjust the pH value to 12, the catalyst is 0.5Kg, and the catalyst is an oxide with activated carbon as a carrier, and the oxide is aluminum peroxide , a mixture of copper peroxide, wherein aluminum peroxide: copper peroxi...

Embodiment 2

[0021] Paraquat wastewater from a company in Jiangsu was used as the water to be treated (CN- content 24000ppm, pH 12), the specific treatment process steps are as follows:

[0022] 1) Oxidation: 10000L of paraquat wastewater in the waste water pool is sent to the oxidation kettle by centrifugal pump, and 0.5Kg catalyst is added, the catalyst is an oxide with active carbon as the carrier, and the oxide is aluminum peroxide, copper peroxide The mixture, wherein aluminum peroxide: copper peroxide = 1:4; open the steam valve to heat, control the pressure to 7MPa, control the temperature to 290°C, and cool down to 40°C after 5 hours of reaction;

[0023] 2) Stripping: the oxidized waste water is sent to the ammonia nitrogen stripping tower by a centrifugal pump, adding alkali to adjust the pH value to 14, adding 0.5Kg of catalyst, the catalyst is an oxide with activated carbon as the carrier, and the oxide is peroxidized A mixture of aluminum and copper peroxide, wherein aluminum ...

Embodiment 3

[0027] Using paraquat wastewater from a company in Shandong as the water to be treated (CN- content 26000ppm, pH is pH), the specific treatment process steps are as follows:

[0028] 1) Oxidation: 10000L of paraquat wastewater in the waste water pool is sent to the oxidation kettle by centrifugal pump, and 0.5Kg catalyst is added, the catalyst is an oxide with active carbon as the carrier, and the oxide is aluminum peroxide, copper peroxide The mixture, wherein aluminum peroxide: copper peroxide = 1:7; open the steam valve to heat, control the pressure to 6MPa, control the temperature to 260°C, and cool down to 50°C after 5 hours of reaction;

[0029] 2) Blowing off: the oxidized waste water is sent into the ammonia nitrogen blowing tower by a centrifugal pump, the pH value is adjusted to 13 by adding alkali, and the catalyst is 0.5Kg. The catalyst is an oxide with activated carbon as a carrier, and the oxide is aluminum peroxide , a mixture of copper peroxide, wherein aluminu...

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PUM

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Abstract

The invention discloses a paraquat pesticide wastewater treatment process. The paraquat pesticide wastewater treatment process is characterized by comprising the following steps: carrying out oxydative degradation on CN- and organic substances in paraquat pesticide wastewater by air under action of a catalyst in an oxidization kettle with pressure of 5-7MPa and temperature of 220-290 DEG C, wherein the COD (chemical oxygen demand) and CN<-> in wastewater are greatly lowered after oxidization; then, introducing air from the bottom of an air stripping tower with the pH of 12-14 and temperature of 40-60DEG C to carry out air stripping for 3-5 hours under the action of the catalyst; recycling ammonia nitrogen in the wastewater in the form of an ammonia gas; feeding the wastewater into an evaporator, evaporating the wastewater at a temperature of 60-80 DEG C, and feeding evaporating liquor to a biochemical system to treat, and exhausting the treated liquor after reaching the standards; and cooling and centrifuging concentrated liquor to obtain solid salts which can be sold abroad, and feeding centrifugal mother liquor into a wastewater collecting tank for next evaporation. The paraquat pesticide wastewater treatment process has the characteristic that CN<-> in the wastewater can be completely removed by virtue of oxidization to provide safety guarantee for subsequent air stripping and evaporating, the ammonia can be recycled by air stripping to produce ammonia sulfate, and the salts can be recycled by evaporation so as to sold abroad, and thus, safe, low-cost and efficient paraquat pesticide wastewater pretreatment is realized, and environment-friendly pressure of enterprises is reduced.

Description

technical field [0001] The invention relates to a pesticide wastewater treatment process, in particular to a paraquat wastewater treatment process, and belongs to the field of environmental protection. Background technique [0002] Paraquat, whose chemical name is 1-1-dimethyl-4-4-bipyridine cationic salt, is a fast-killing herbicide with contact and certain systemic effects. It can be quickly absorbed by the green tissue of plants, causing them to die. Has no effect on non-green organizations. In the soil, it quickly combines with the soil to passivate, and is ineffective for plant roots, perennial rhizomes and perennial roots. However, there is no mature and effective industrialized treatment method for the wastewater produced in the production process of paraquat at home and abroad. This waste ice contains many toxic and harmful pollutants such as CN- and benzene ring substances. The waste water has high pollutant concentration, high salt content, high chroma and high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/74C01C1/242
CPCY02P20/584
Inventor 覃军杨光富刘志新张业祥
Owner HUBEI XIANLONG CHEM IND
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