Method of treating emulsion liquid waste water using industrial spent acid

A technology of industrial waste acid and waste emulsion, which is applied in the direction of adsorption water/sewage treatment, neutralization water/sewage treatment, etc., can solve the problems of high treatment cost, difficulty, and high cost of electrolytic treatment, and achieve simple process and low cost. low effect

Inactive Publication Date: 2004-03-03
BAOTA IND CO LTD
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AI Technical Summary

Problems solved by technology

The coagulation method is to add chloride salt to the emulsion wastewater to achieve the effect of demulsification and precipitation; this method has high treatment costs, high oil content and COD value in the treated water, and it is difficult to further purify
The main problem of the electrolysis method is that the processing cost is too high and it is difficult to use it on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] After concentrating the used emulsion, add 5% of its volume of waste acid solution after pickling to it, so that the pH value of the mixed solution is around 2, and stir while adding the waste acid solution after pickling, so that After the mixed solution is fully mixed, let the mixed solution stand for 30 hours. At this time, the demulsification is completed, the oil and water are separated, and the upper layer of oil is discharged and collected, which can be used as fuel for the oil-fired boiler. After adding an appropriate amount of calcium carbonate to the oil-separated water to adjust the pH value to about 6, two methods can be used for further treatment; one is to add an appropriate amount of lime water to adjust the pH value to about 7, and then the upper water Up to standard emissions. The other is to add 4% activated carbon or sieved activated coal to the water, stir it fully, and let it stand for 18 hours, then the upper water can be discharged up to the stand...

Embodiment 2

[0009] After concentrating the used emulsion, add 4% of its volume of waste acid solution after pickling, so that the pH value of the mixed solution is about 4, and stir while adding the waste acid solution after pickling, so that After the mixed solution is fully mixed, let the mixed solution stand for 20 hours. At this time, the demulsification has been completed, and the oil and water are separated. After the upper layer of oil is discharged, it is collected and can be used as a fuel for an oil-fired boiler. After adding an appropriate amount of calcium carbonate to the water from which the oil is separated to adjust the pH value to about 7.5, two methods can be used for further treatment; one is to add an appropriate amount of lime water to adjust the pH value to about 8, and then the upper water Up to standard emissions. The other is to add 4% activated carbon or sieved activated coal to the water, stir it fully, and let it stand for 30 hours, then the upper water can be ...

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PUM

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Abstract

A process for treating the waste emulsion with the used acid generated by pickling includes such steps as adding the said used acid to the waste emulsion which stirring, laying aside for 18-36 hr, separating upper oil layer from water, adding calcium carbonate to the water, laying aside for 2-12 hr, regulate adding lime water to pH to 7-9, laying aside for 18-36 hr, and draining off the upper water layer. Its advantages are low cost and using the recovered oil as fuel of boiler.

Description

technical field [0001] The invention belongs to the treatment of industrial emulsified wastewater, in particular to a method for treating emulsified wastewater with industrial waste acid. Background technique [0002] Most of the coolants in the machining industry are oil-water emulsions, and the used emulsions are basically discharged directly, which causes a lot of water pollution. At present, with people's emphasis on environmental pollution, the requirements for sewage discharge are getting higher and higher. At present, the commonly used treatment methods for emulsion wastewater include coagulation and electrolysis. The coagulation method is to add chloride salt to the emulsion wastewater to achieve the effect of demulsification and precipitation; this method has high treatment costs, high oil content and COD value in the treated water, and it is difficult to further purify . The main problem of the electrolysis method is that the processing cost is too high and it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/66
Inventor 李柏如夏永红王旭飞袁和会邹奕张培强
Owner BAOTA IND CO LTD
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