Treatment method of high concentration undegradable nitrile containing organic waste water

A technology of organic wastewater and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problems of poor biodegradability, high toxicity and unacceptable engineering investment of wastewater

Active Publication Date: 2008-07-23
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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  • Treatment method of high concentration undegradable nitrile containing organic waste water
  • Treatment method of high concentration undegradable nitrile containing organic waste water
  • Treatment method of high concentration undegradable nitrile containing organic waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: a kind of treatment method of high concentration, refractory organic waste water containing nitrile:

[0045]In 2500 milliliters of this high-concentration, refractory nitrile-containing organic waste water (CODcr content is 32500 mg / l), add 5 grams of potassium oxide, stir 10~20 min, be that the sodium hydroxide aqueous solution of 30% by weight percentage concentration is used to regulate above-mentioned waste water The pH value is 10, and the waste water is heated to control the reaction temperature at 40-60° C., stirred at a slow speed for about 30-40 minutes, and filtered after the polymerization reaction is complete.

[0046] Add 25 grams of lime to the filtrate after the above polymerization reaction, stir, then heat the waste water at 80-95° 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

[0047] 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, be 42% sodium hydroxide with weight percent concentration The aqueous solution adjusts the pH value of the wastewater to 9, heats the wastewater to control the reaction temperature at 30-50° C., stirs at a slow speed for about 20-30 minutes, and filters after the polymerization reaction is complete.

[0048] Add 30 grams of lime to the filtrate after the above polymerization reaction, stir, then heat the waste water at 75-90° C. for 6 hours, and finally filter. The CODcr content in the filtrate dropped to 21900mg / l, and the CODcr removal rate was 37.29%.

Embodiment 3

[0049] Embodiment 3: in 2500 milliliters (CODcr content is 28565mg / l) of high concentration, refractory nitrile-containing organic waste water, add 10 grams of calcium oxide, stir 5~10min, be 40% sodium hydroxide aqueous solution adjustment with weight percent concentration The pH value of the above wastewater is 11, and the wastewater is heated to control the reaction temperature at 30-40° C., stirred at a slow speed for about 30-40 minutes, and filtered after the polymerization reaction is complete.

[0050] Add 20 grams of lime to the filtrate after the above polymerization reaction, stir, then heat the waste water at 90-100° C. for 3 hours, and finally filter. The CODcr content in the filtrate dropped to 17213mg / l, and the CODcr removal rate was 39.74%.

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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, refractory nitrile-containing organic wastewater. Background technique [0002] The so-called high-concentration, refractory nitrile-containing organic wastewater refers to hydroxyacetonitrile: 8~12g / l; anilinoacetonitrile: 8~10g / l; aniline: 2~5g / l; diazo value: 8~12g / l; chemical oxygen demand (hereinafter referred to as CODcr): 26000 ~ 35000mg / l organic wastewater. 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 still cannot be discharged due to their high toxicity, and the effect of wastewater treatment cannot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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