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Method for pretreating trichlorfon wastewater

A technology for trichlorfon and pretreatment, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. problems, to achieve the effect of solving intractable treatment, reducing negative effects, and improving biodegradability

Inactive Publication Date: 2012-05-23
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can greatly improve the recovery rate of trichlorfon, adding more salt components to the wastewater makes the purification and recycling of the wastewater itself more difficult.
[0006] A method for treating industrial wastewater by activated sludge-micro-electrolysis disclosed in the specification of application patent No. 01142858.9, and a molecular micro-electrolysis treatment method of cyanide-containing electroplating wastewater disclosed in the specification of application patent No. 200810199052.0, these two documents In the micro-electrolysis reaction, only lye is added to adjust the pH value of the wastewater, and only Fe(OH) is formed 3 The flocs adsorb some pollutants to form sediments, the adsorption is not complete, the precipitation time is too long, and the effect is not very ideal

Method used

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  • Method for pretreating trichlorfon wastewater
  • Method for pretreating trichlorfon wastewater
  • Method for pretreating trichlorfon wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A serving of trichlorfon wastewater: pH 0.56, containing 76612mg / L of COD, 3.9% of trichlorfon, and 29566mg / L of TP.

[0026] First add calcium carbonate to it, adjust the pH value to 1.5; then enter the micro-electrolysis reactor, the residence time is controlled at 0.5 hours, and the pH value of the wastewater treated by the micro-electrolysis reactor rises to 4.0; Add 0.5% oxidant hydrogen peroxide by weight of wastewater into the fast reaction tank, and stir for 20 minutes; overflow into the slow reaction tank, add calcium oxide to adjust the pH value to 9, and add coagulant APAM to stir; finally enter the coagulation sedimentation tank, The liquid is separated from the sediment in the sedimentation tank, and the liquid is sent to the biochemical treatment system for subsequent treatment. The pretreated liquid contains 49882mg / L of COD, 0.009% of trichlorfon, and 2050mg / L of TP.

Embodiment 2

[0028] A serving of trichlorfon wastewater: PH 0.8, COD 87165mg / L, containing 3.5% trichlorfon, containing TP 32966mg / L.

[0029] First, add calcium oxide lye to it, adjust the pH value to 2.5; then enter the micro-electrolysis reactor, the water inlet method is bottom-in and top-out, the residence time is controlled at 2 hours, and the pH value of the wastewater treated by the micro-electrolysis reactor rises to 5; pump into the fast reaction tank, add 1.5% oxidant concentrated sulfuric acid of waste water weight in the fast reaction tank, stir for 40 minutes; overflow into the slow reaction tank, then adjust the pH value to 10 with calcium hydroxide , and add the coagulant CPAM to stir, and finally enter the coagulation sedimentation tank, stand still, separate the liquid from the sediment in the coagulation sedimentation tank, and send the liquid to the biochemical treatment system for subsequent treatment. The pretreated liquid contains 52299mg / L of COD, 0.007% of trichlor...

Embodiment 3

[0031] A serving of trichlorfon wastewater: PH 0.94, COD 93500mg / L, containing 3.1% trichlorfon, containing TP 35400mg / L.

[0032] First add alkali sodium hydroxide to adjust the pH value to 4; then enter the micro-electrolysis reactor, the trichlorfon wastewater is fed from the bottom to the top, and the residence time is controlled at 4 hours. The pH value of the wastewater treated by the reactor Rise to 6; pump into the fast reaction tank, add 2.5% oxidant hydrogen peroxide and concentrated sulfuric acid mixture in the fast reaction tank, stir for 1 hour; overflow into the slow reaction tank, add sodium hydroxide solution Adjust the pH value to 11, add the coagulant ferric chloride, and stir; finally, enter the coagulation sedimentation tank, stand still, precipitate the sediment, separate the liquid from the sediment, and send the liquid to the biochemical treatment system for subsequent processing . The pretreated liquid contains COD57400mg / L, trichlorfon 0.005%, and TP1...

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Abstract

The invention provides a method for pretreating trichlorfon wastewater. In the method, the trichlorfon wastewater is subjected to the following process treatments of: regulating the pH value to 1.5 to 4 by adding alkali; performing a reaction for 0.5 hour to 4 hours in a micro-electrolysis reactor; adding an oxidizing agent to oxidize; regulating the pH value to 9 to 11 by adding alkali; adding a coagulant to remove precipitates; feeding the obtained product into a biological treatment system to treat; and finally feeding the obtained product to a sewage treatment plant. After the trichlorfon wastewater is pretreated by the method, the removal rate of featured pollutants in the trichlorfon wastewater reaches over 99 percent, the TP (total phosphorus) removal rate reaches over 95 percent and the COD (Chemical Oxygen Demand) removal rate reaches over 30 percent. The problem that the trichlorfon wastewater is difficult to treat after trichlorfon is produced is solved.

Description

technical field [0001] The invention relates to a method for treating wastewater after the production of trichlorfon, an agrochemical product, in particular to a pretreatment method for performing micro-electrolysis reaction on the trichlorfon wastewater. Background technique [0002] In the traditional one-step production of trichlorfon, 90% of trichlorfon is obtained, and then purified by water washing and crystallization, a higher content of trichlorfon can be obtained. However, the trichlorfon wastewater after washing not only contains a small amount of trichlorfon, but also contains a high concentration of phosphorus (abbreviated as TP), contains organic pollutants (the total amount is expressed in COD), and has a high salt content, so it is very difficult to treat. Large, it is difficult to treat industrial wastewater, and it is difficult to meet the requirements of biochemical indicators by conventional physical and chemical treatment processes. [0003] Usually, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 蔡建国薛健张海滨孟长春陈娟
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY