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Method for treating p-chloro-o-nitroaniline wastewater

A technology for nitroaniline and wastewater treatment, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high energy consumption, low treatment concentration, complex process, etc. The effect of promotion, heat saving and simple process

Inactive Publication Date: 2012-02-15
JIANGSU LONGCHANG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of using zeolite to absorb ammonium ions in wastewater and regenerating zeolite with lye can not remove ammonia and ammonium ions in water at the same time, and there are problems such as low treatment concentration and complicated process.
Chinese patent CN 1271690A proposes a steam stripping method for treating ammonia-containing wastewater, which has the disadvantages of high energy consumption and difficult treatment of by-product high-salt wastewater, and is not suitable for the treatment of ammonia-containing wastewater of p-chloro-o-nitroaniline

Method used

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  • Method for treating p-chloro-o-nitroaniline wastewater
  • Method for treating p-chloro-o-nitroaniline wastewater

Examples

Experimental program
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Embodiment

[0013] Enter the p-chloro-o-nitroaniline wastewater with a high concentration of total ammonia in the table below from the bottom of the tower, and flow out from the top of the tower. 150kg of quicklime (CaO) for replacement reaction, control the temperature at about 120°C, react for 2 hours, the gas (ammonia and water vapor) generated during the reaction enters the recovery tank to recover ammonia, when the reaction ends (no large amount of vapor phase comes out ), raise the temperature to 150°C, react for another 0.5 hours, recover some more water, and then release the concentrated saturated calcium chloride mother liquor, put it into the sedimentation tank to cool down and precipitate the solid phase (water-containing) calcium chloride precipitate.

[0014] After processing, the results are as follows:

[0015]

[0016] Known from the table, no matter how much the sewage key total nitrogen concentration is after the above method is processed, after this method is process...

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Abstract

The invention discloses a method for treating p-chloro-o-nitroaniline wastewater, which is characterized by comprising the following steps of: treating ammoniac p-chloro-o-nitroaniline wastewater to be transparent by using an activated carbon tower, adding quick lime into a replacement reaction kettle, controlling the temperature to be 120 DEG C, reacting for 2 hours and removing free ammonia and ammonia which exists in the form of ammonium chloride. The invention has the advantage that the method is suitable for treating the p-chloro-o-nitroaniline wastewater with different concentration. The ammoniac p-chloro-o-nitroaniline wastewater is treated to be transparent by using the activated carbon tower, the quick lime is added into the replacement reaction kettle, and the free ammonia and the ammonia which exists in the form of the ammonium chloride are removed. The total content of the ammonia in the wastewater is reduced while the ammonia is recovered.

Description

technical field [0001] The invention belongs to a method for treating ammoniacal wastewater containing p-chloro-o-nitroaniline. Background technique [0002] The pollutants in p-chloro-o-nitroaniline wastewater are mainly free ammonia and ammonia in the form of ammonium chloride salt. The treatment of ammonia-containing wastewater includes biological methods and physical and chemical methods, and biological methods include A / 0 method and intermittent activated sludge method. This type of method mainly uses the biological nitrification process and denitrification process to remove ammonia in the water. The ammonia concentration in the raw water is low, and a certain amount of matrix concentration is required in the water. The ammonia nitrogen in the wastewater can be treated from 50-500mg / L to 10- Below 30mg / L. The physicochemical method uses zeolite to absorb ammonium ions in wastewater and regenerates zeolite with lye, which cannot remove ammonia and ammonium ions in wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F101/16
Inventor 佘道才王兆昌吴春江许小亮
Owner JIANGSU LONGCHANG CHEM
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