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Process for treating waste water containing alkali and oil

A wastewater treatment and wastewater technology, which is applied in the fields of water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc. , the water quality is difficult to meet the specified standards and other problems, to achieve the effect of reasonable process, low input cost and extended cleaning cycle

Active Publication Date: 2012-08-29
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] This method adopts ultrafiltration treatment first, then neutralization, flocculation treatment, and filtration, which increases the cleaning workload of the ultrafiltration equipment and affects the working efficiency and service life of the ultrafiltration equipment. The workload of silting is heavy, and the water quality index of the treated alkali-containing and oil-containing wastewater is not very high
[0004] Especially for the alkali-containing and oil-containing wastewater from the cold rolling mill, due to the good chemical stability of the oil-containing and emulsion wastewater and the complex water quality, it is difficult to meet the specified standards after treatment.

Method used

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Examples

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Embodiment Construction

[0020] Taking the treatment of iron-containing alkali and oily waste water of a cold rolling plant as an example below, the specific implementation process of the present invention will be described.

[0021] A process for the treatment of alkali-containing and oily wastewater, the process is described as follows:

[0022] 1) Oxidative acid neutralization; first, neutralize the alkali-containing and oily wastewater, add oxidizing acid (nitric acid or sulfuric acid) to neutralize the alkali-containing and oily wastewater, and at the same time, carry out demulsification and layering by oxidizing acid, Most of the oil and water are separated; the pH value of the neutralized waste water is 7.2-8.2. .

[0023] 2) Inclined plate sedimentation: the above wastewater is subjected to inclined plate sedimentation, which can remove about 50% of suspended solids and oil slicks.

[0024] 3) paper tape filtration; in this process, cocoa removes about 30% of suspended solids and slick oil. ...

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Abstract

The invention relates to a process for treating waste water containing alkali and oil. The process comprises the following steps: neutralizedly treating the waste water containing alkali and oil; then sequentially carrying out inclined plate precipitation, tapes filtration and ultra-filtration treatment; finally discharging. The neutralization is achieved in a step that the waste water containingalkali and oil is neutralized by adding oxidized acid, and meanwhile, emulsion breaking, delamination as well as oil-water separation are carried out also by same. The process adopts neutralization and flocculation firstly and then carries out ultra-filtration treatment, after which the water quality is good, and less chemical agents are used.

Description

technical field [0001] The invention relates to a process for treating alkali-containing and oil-containing wastewater. Background technique [0002] In the prior art, the method usually used to treat alkali-containing and oily wastewater is that the wastewater enters the wastewater regulating tank, enters the circulating pool after pretreatment, and performs circulating ultrafiltration, and the filtrate after ultrafiltration is discharged to the acid-base neutralization system , after neutralization to reach a pH value of 6-9, add flocculant to form alum flowers for precipitation, and then filter through a multi-media filter; the floating oil on the circulation box is removed by a belt degreaser and sent to the waste oil storage Shipping out of the box. The thick oily wastewater in the ultrafiltration circulation box is regularly pumped to the thick liquid decomposition tank with concentrated liquid. After heating, adding acid and standing still, the oil and water are sepa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52
Inventor 陈蕾王建东陈日晶
Owner ANGANG STEEL CO LTD