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Method and equipment for using aluminum-containing wastewater as circulating cooling water

A technology for circulating cooling water and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, neutralized water/sewage treatment, etc., can solve high operation and maintenance costs, short membrane service life, high cost of membrane technology, etc. problems, to achieve the effect of avoiding direct discharge of waste water, saving water resources and energy

Active Publication Date: 2013-11-20
SHANGHAI LIGHT IND RES INST
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Problems solved by technology

[0003] In the existing technology, membrane technology is often used to pre-treat wastewater when it is reused in the circulating cooling water system. However, the actual engineering application experience shows that the cost of membrane technology is high, and the service life of the membrane is short, and the operation and maintenance cost is high.

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  • Method and equipment for using aluminum-containing wastewater as circulating cooling water
  • Method and equipment for using aluminum-containing wastewater as circulating cooling water
  • Method and equipment for using aluminum-containing wastewater as circulating cooling water

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Embodiment Construction

[0015] Usually, the main pollutant in low-aluminum wastewater is aluminum, the content is about 10mg / L-1g / L, and other components can contain a small amount of COD (chemical oxygen demand, the concentration is less than 75mg / L, using "Water and Wastewater Monitoring "Analysis Method" (Fourth Edition) Potassium Dichromate Method Detection) to measure organic matter and other reducing substances, ammonia nitrogen (concentration lower than 3mg / L), etc. Among them, because aluminum ions have flocculation and are very easy to settle, the existence of aluminum ions will cause serious fouling of the circulating cooling water system. Therefore, the present invention expects to reduce the concentration of aluminum ions to alleviate or avoid this hazard. In addition, it is also expected to remove COD substances and ammonia nitrogen, so that it is suitable for use in circulating cooling water systems. Different from the traditional treatment method, the present invention does not perform...

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Abstract

The invention relates to a method and equipment for using aluminum-containing wastewater as circulating cooling water. The method and the equipment are used for recycling the aluminum-containing wastewater which contains aluminum ions and a small amount of organic matter and of which the aluminum ion concentration is 10mg / L to 1g / L; the method comprises the following steps of: adjusting the pH value of wastewater to be 7.5, and coagulating aluminum ions in the wastewater; allowing wastewater to pass through a filter to filter coagulated aluminum, and biological clay in the wastewater to ensure that the aluminum content in the wastewater is reduced to less than 3mg / L; inputting the filtered wastewater into a circulating cooling water system; and injecting ozone into the circulating cooling water system and performing water treatment to degrade the organic matter in water.

Description

technical field [0001] The invention relates to waste water treatment and clean production technology, in particular to a method and equipment for using aluminum-containing waste water as make-up water for a circulating cooling water system. Background technique [0002] For the whole society, industry has always been a major source of urban water consumption. In China, the annual industrial water consumption is about 110 billion m 3 Among them, tap water is directly used as supplementary water for industrial circulating cooling water, accounting for about 70% of industrial water consumption, which puts a lot of pressure on the already tight water resources. Therefore, looking for a second water source other than tap water for circulating cooling water is of great significance for water saving. [0003] In the prior art, membrane technology is often used to pre-treat wastewater when it is reused in the circulating cooling water system. However, practical engineering applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/78C02F1/52
Inventor 邱真真
Owner SHANGHAI LIGHT IND RES INST
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