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Treatment method of high concentration undegradable nitrile containing organic waste water

A technology of organic wastewater and treatment methods, applied in water/sewage treatment, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as unacceptable engineering investment, high toxicity, blank, etc.

Active Publication Date: 2007-02-14
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that this kind of wastewater has high nitrile content, high toxicity, NH 3 The high content of -N and CODcr makes the biodegradability of the wastewater extremely poor. If the technologies such as activated carbon adsorption, membrane separation or macroporous resin in the prior art are used for treatment, only the harmful substances in it will be partially separated. , and the separated harmful substances are still unable to be discharged due to their high toxicity, and the effect of wastewater treatment cannot be achieved, and the project investment is also unacceptable
[0003] Consult domestic and foreign technical literatures are basically information on the treatment of inorganic cyanide wastewater, and there is no report on the treatment of high-concentration nitrile organic wastewater
In addition, Shenyang Research Institute of Chemical Industry, which is a leader in China in the application of wet catalytic oxidation technology for wastewater treatment, has not involved in high-concentration, refractory nitrile-containing organic wastewater.
Therefore, the treatment of this type of wastewater is basically blank in the current prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: a kind of treatment method of high-concentration, refractory nitrile-containing organic wastewater:

[0035] In 2500 ml of this high-concentration, refractory nitrile-containing organic waste water (CODcr content is 32,500 mg / l), add 5 grams of potassium oxide, stir for 10 to 20 minutes, and adjust the above-mentioned waste water with an aqueous sodium hydroxide solution with a concentration of 30% by weight. The pH value is 10, heating the waste water to control the reaction temperature to 40-60°C, stirring at a slow speed for about 30-40min, and filtering after the polymerization reaction is complete.

[0036] Add 25 grams of lime to the filtrate after the above-mentioned polymerization reaction, stir, then heat the waste water to keep the temperature at 80-95 DEG C for 4 hours, and finally filter. The CODcr content in the filtrate dropped to 18185mg / l, and the CODcr removal rate was 44.05%.

Embodiment 2

[0037] Embodiment 2: in a kind of high concentration, in 2500 milliliters of refractory nitrile-containing organic waste water (CODcr content is 34923mg / l), add 8 grams of sodium oxide, stir 5~10min, use the sodium hydroxide that weight percent concentration is 42% The pH value of the above-mentioned waste water is adjusted by the aqueous solution to 9, and the waste water is heated to control the reaction temperature to be 30-50° C., stirring at a slow speed for about 20-30 min, and filtering after the polymerization reaction is complete.

[0038]Add 30 grams of lime to the filtrate after the above-mentioned polymerization reaction, stir, then heat the waste water to keep the temperature at 75-90 DEG C for 6 hours, and finally filter. The CODcr content in the filtrate decreased to 21900mg / l, and the CODcr removal rate was 37.29%.

Embodiment 3

[0039] Embodiment 3: in 2500 milliliters of high-concentration, refractory nitrile-containing organic wastewater (CODcr content is 28565 mg / l), add 10 grams of calcium oxide, stir for 5 to 10 min, and adjust with a 40% aqueous sodium hydroxide solution by weight percentage The pH value of the above-mentioned waste water is 11, and the waste water is heated to control the reaction temperature to be 30 to 40° C., stirred at a slow speed for about 30 to 40 minutes, and filtered after the polymerization reaction is complete.

[0040] Add 20 grams of lime to the filtrate after the above-mentioned polymerization reaction, stir, then heat the waste water to keep the temperature at 90-100 DEG C for 3 hours, and finally filter. The CODcr content in the filtrate decreased to 17213mg / l, and the CODcr removal rate was 39.74%.

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PUM

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Abstract

The present invention relates to process of treating waste water containing nitrile and other non-degradable organic matter in high concentration. The waste water is first polymerizing treated under alkaline condition, and the filtrate is then added with lime for hydrolysis treating. According to the feature of nitrile compounds, which are easy to self polymerize under alkaline condition, alkali is added into the waste water to regulate pH value while heating, so as to produce polymerizing reaction to destroy nitrile structure and lower the content of NH3-N and CODcr greatly simultaneously.

Description

technical field [0001] The invention relates to a treatment method for high-concentration and refractory nitrile-containing organic wastewater. Background technique [0002] The so-called high-concentration, refractory nitrile-containing organic wastewater here refers to hydroxyacetonitrile: 8-12g / l; aniline-acetonitrile: 8-10g / l; aniline: 2-5g / l; diazo value: 8-12g / l; chemical oxygen consumption (hereinafter referred to as CODcr): 26000~35000mg / l of organic wastewater. It can be seen that this wastewater has high nitrile content, high toxicity, NH 3 -The high content of N and CODcr makes the wastewater extremely poor in biodegradability. If the existing technologies such as activated carbon adsorption, membrane separation or macroporous resin are used for treatment, only part of the harmful substances will be separated out. However, some of the separated harmful substances cannot be discharged due to their high toxicity, and the effect of wastewater treatment cannot be a...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/66C02F1/58C02F1/461C02F1/52
Inventor 甘永昌李宏斌周明权罗延谷
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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