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Treatment method of alkaline wastewater

A treatment method and wastewater technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the impact of treatment load and treatment effect of sewage treatment system, one-time investment and operation The problems of high cost and harsh operating conditions have achieved the effect of significant treatment effect, reduced consumption of sulfuric acid resources and convenient operation.

Inactive Publication Date: 2015-09-30
HENAN SHUANGYU NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: (1) The neutralization efficiency of sulfuric acid is high, but the equipment is severely corroded, and the operation is often interrupted due to corrosion problems during operation; (2) The wet oxidation process is adopted, and the wastewater treatment capacity is low, and The one-time investment and operating costs are huge; (3) The wet oxidation process has strict requirements on operating conditions, and the COD oxidation removal rate is only 20-30%, which has a serious impact on the treatment load and treatment effect of the subsequent sewage treatment system

Method used

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  • Treatment method of alkaline wastewater
  • Treatment method of alkaline wastewater

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Experimental program
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Embodiment 1

[0029] A treatment method for alkaline wastewater, comprising the steps of:

[0030] (1) Filter the collected alkaline wastewater with a filter press to remove large particles of solid impurities in the alkaline wastewater, and then send the filtered alkaline wastewater into the regulating tank to mix evenly;

[0031] (2) The alkaline wastewater treated in step (1) is passed into the turbulent scrubber as a circulating washing liquid, and then the sulfur-containing tail gas is passed into the turbulent scrubber, and the sulfur-containing tail gas and the alkaline wastewater are in the turbulence Reverse contact in the scrubber for full reaction; at the same time, measure the pH value of the circulating alkaline wastewater in the turbulent scrubber during the reaction process. When the pH value of the alkaline wastewater reaches 8, the alkaline wastewater is discharged and sent to the next treatment process;

[0032] (3) Pass the alkaline wastewater treated in step (2) into a ...

Embodiment 2

[0037] The content of embodiment 2 is basically the same as embodiment 1, and its difference is:

[0038] In step (2): during the reaction process, the pH value of the alkaline wastewater circulating in the turbulent scrubber is measured, and when the pH value of the alkaline wastewater reaches 7, the alkaline wastewater is discharged and sent to the next treatment process;

[0039] In step (3): pass the alkaline wastewater treated in step (2) into a high-efficiency settler, and carry out 10h sedimentation treatment at room temperature;

[0040] In step (4): pass the alkaline wastewater treated in step (3) into the air flotation device, perform 8h air flotation treatment, remove the oil and phenol in the alkaline wastewater, and recover the oil and phenol;

[0041] (5) Send the alkaline wastewater treated in step (4) into a centrifuge for 13 minutes of centrifugation;

[0042] Wherein, in step (2), the SO in the sulfur-containing tail gas 2 The content is 30%; Alkaline wastewa...

Embodiment 3

[0044] The content of embodiment 3 is basically the same as embodiment 1, and its difference is:

[0045] In step (2): During the reaction process, the pH value of the alkaline wastewater circulating in the turbulent scrubber is measured, and when the pH value of the alkaline wastewater reaches 9, the alkaline wastewater is discharged and sent to the next treatment process;

[0046] In step (3): pass the alkaline wastewater treated in step (2) into a high-efficiency settler, and carry out sedimentation treatment at room temperature for 12 hours;

[0047] In step (4): pass the alkaline wastewater treated in step (3) into the air flotation device, perform 10h air flotation treatment, remove the oil and phenol in the alkaline wastewater, and recover the oil and phenol;

[0048] (5) Send the alkaline wastewater treated in step (4) into a centrifuge for 15 minutes of centrifugation;

[0049] Wherein, in step (2), the SO in the sulfur-containing tail gas 2 The content is 25%; Alka...

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Abstract

The invention belongs to the field of chemical wastewater treatment and specifically relates to a treatment method of oil-refining alkaline wastewater. The treatment method of oil-refining alkaline wastewater comprises the following steps: firstly filtering to remove heavy large-granular solid impurities in wastewater, using sulfide-bearing wastewater to react with oil-refining alkaline wastewater so as to convert sulfide in the wastewater to sulfur precipitate and simultaneously neutralize OH- in the wastewater, gradually removing sulfide, oil and naphthenic acid from the wastewater through a high-efficiency settler, an air flotation device and a centrifuge, and finally carrying out comprehensive treatment by allowing the processed oil-refining alkaline wastewater to enter a sewage comprehensive treatment system. The method provided by the invention has advantages of simple technology, operating convenience and remarkable treatment effect. By the method, treatment cost of oil-refining alkaline wastewater is greatly reduced.

Description

technical field [0001] The invention belongs to the field of chemical wastewater treatment, and in particular relates to a treatment method for alkaline wastewater. Background technique [0002] In the process of petroleum processing, NaOH is often used to absorb the H produced in the process of catalytic cracking, hydrofining, ethylene production and other reactions. 2 S gas produces a large amount of sulfur-containing waste lye; and when diesel oil, gasoline, liquefied gas and other products are subjected to alkali washing and refining, a kind of toxic and harmful pollutants such as a large amount of oil, phenols and sodium naphthenate are also produced. Alkaline waste liquid, these sulfur-containing waste lye and alkaline waste liquid usually need to be mixed and treated together; because these sulfur-containing waste lye and alkaline waste liquid have high pollutant concentration and high alkalinity, they are collectively called alkali Sexual waste water. The alkaline ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 王胜利王东亮侯明旺
Owner HENAN SHUANGYU NEW MATERIAL TECH