Iron and steel enterprise wastewater advanced treatment and recycling process

A technology for advanced treatment and waste water, which is applied in metallurgical waste water treatment, water/sewage treatment, biological water/sewage treatment, etc. It can solve the problems of substandard discharge indicators and insufficient consumption, so as to reduce the processing load, achieve high cleanliness, and save energy. cost effect

Pending Publication Date: 2021-12-07
SHANDONG SHIHENG SPECIAL STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Iron and steel enterprises are large water consumers. With the severe environmental protection situation, the concentrated water produced by the enterprise's existing sewage treatment plant is mainly used for hot slag and blast furnace slag flushing. Due to poor water quality and serious scaling, it cannot be consumed within the enterprise. , needs to be discharged, and the direct discharge index is not up to standard, so the existing concentrated water needs to be treated and reused

Method used

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  • Iron and steel enterprise wastewater advanced treatment and recycling process
  • Iron and steel enterprise wastewater advanced treatment and recycling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 1 As shown, the present invention provides a kind of iron and steel enterprise wastewater advanced treatment reuse process, comprises the following steps:

[0026] Due to the high content of Fe ions in the wastewater produced by iron and steel plants, the traditional neutralization reaction adopts the method of lime neutralization, which will produce a large amount of residue, so the lime is replaced by caustic soda, and the wastewater enters the neutralization reaction tank after coarse filtration. Add caustic soda, coagulant and flocculant to the reaction tank, and carry out mechanical stirring, and stay for 30 minutes. When the pH value is high, caustic soda is used as a neutralizing agent, which can reduce the amount of residue and improve neutralization efficiency. It can be compared with Fe and Cu ions quickly form hydroxide precipitates, thereby improving the removal rate of the metal ions;

[0027] The wastewater after the reaction in the neutra...

Embodiment 2

[0035] The difference between this embodiment and other embodiments is that the wastewater treated in the contact oxidation tank enters the ultrafiltration membrane tank for filtration, and the membrane flux is controlled at 31L / m 2 •h -1 , the filtered water is discharged and utilized through the reclaimed water reuse pool;

[0036] Set 10 separate membrane pools in the ultrafiltration membrane pool, the ultrafiltration membrane is immersed in the membrane pool, and the water pump sucks from the water outlet of each membrane pool to make the ultrafiltration membrane generate a vacuum, and push the water in the membrane pool under the vacuum pressure to enter In the membrane, the large particles of pollutants in the sewage are intercepted by the micropores on the surface of the membrane, and the filtered water enters the reclaimed water reuse tank for discharge and utilization;

[0037] The membrane area of ​​the ultrafiltration membrane is 6000m2, the aperture is 0.06um, and...

Embodiment 3

[0041] The difference between this embodiment and other embodiments is that the wastewater treated in the contact oxidation tank enters the ultrafiltration membrane tank for filtration, and the membrane flux is controlled at 33L / m 2 • h -1 , the filtered water is discharged and utilized through the reclaimed water reuse pool;

[0042] Set 10 separate membrane pools in the ultrafiltration membrane pool, the ultrafiltration membrane is immersed in the membrane pool, and the water pump sucks from the water outlet of each membrane pool to make the ultrafiltration membrane generate a vacuum, and push the water in the membrane pool under the vacuum pressure to enter In the membrane, the large particles of pollutants in the sewage are intercepted by the micropores on the surface of the membrane, and the filtered water enters the reclaimed water reuse tank for discharge and utilization;

[0043] The membrane area of ​​the ultrafiltration membrane is 6500m2, the aperture is 0.07um, an...

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Abstract

The invention discloses an iron and steel enterprise wastewater advanced treatment and recycling process, which comprises the following steps that wastewater enters a neutralization reaction tank after being subjected to coarse filtration, and caustic soda, a coagulant and a flocculant are added into the neutralization reaction tank; the wastewater reacted in the neutralization reaction tank enters a flocculation sedimentation tank; the reacted wastewater in the flocculation sedimentation tank enters a CAF air floatation tank; suspended matter in the CAF flotation tank enters a sludge concentration tank; the wastewater in the CAF flotation tank enters a contact oxidation tank, and macromolecular organic matter in the wastewater is removed; and the wastewater treated by the contact oxidation tank enters an ultrafiltration membrane tank to be filtered. An air flotation machine in the CAF flotation tank can remove grease, suspended solids and metal ions in water, wastewater in the CAF flotation tank enters the contact oxidation tank, macromolecular organic matter in the wastewater is removed through the contact oxidation tank, so that the water quality is further improved, the purposes of purification and separation are achieved, and the recycled water is relatively high in cleanliness and can be utilized to most areas of a factory, so that the cost is saved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, and more specifically, to a process for advanced treatment and reuse of wastewater in iron and steel enterprises. Background technique [0002] Iron and steel enterprises are large water consumers. With the severe environmental protection situation, the concentrated water produced by the enterprise's existing sewage treatment plant is mainly used for hot slag and blast furnace slag flushing. Due to poor water quality and serious scaling, it cannot be consumed within the enterprise. , needs to be discharged, and the direct discharge index is not up to standard, so the existing concentrated water needs to be treated and reused. Contents of the invention [0003] The object of the present invention is to provide a process for advanced treatment and reuse of wastewater from iron and steel enterprises. [0004] In order to achieve the above object, the technical scheme adopted in the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/16
CPCC02F9/00C02F1/001C02F1/66C02F1/444C02F1/5236C02F1/24C02F1/40C02F3/10C02F2103/16
Inventor 吴素芬索勇严磊王宗臣
Owner SHANDONG SHIHENG SPECIAL STEEL GROUP
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