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System and method for denitrification treatment on stainless steel pickling wastewater

A technology of pickling wastewater and treatment system, which is applied in the field of water treatment, and can solve problems such as complex operation management, maintenance and replacement of aeration pipes, and easy failure of electromechanical equipment.

Pending Publication Date: 2018-11-30
SHANGHAI SHIYUAN ENVIRONMENT PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the traditional SBR system can flexibly control the process parameters, it also has disadvantages such as complicated operation management, easy failure of electromechanical equipment, and maintenance and replacement of aeration pipes.

Method used

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  • System and method for denitrification treatment on stainless steel pickling wastewater
  • System and method for denitrification treatment on stainless steel pickling wastewater

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Embodiment 1

[0042] The water volume and total nitrogen concentration of stainless steel pickling wastewater vary greatly, and in addition to containing a large amount of nitrate nitrogen, there is also ammonia nitrogen that is catalyzed after reuse of reclaimed water. After secondary neutralization and precipitation of stainless steel pickling wastewater discharged by a stainless steel production enterprise, 80% of the water is reused, and 20% of the water enters the subsequent stainless steel pickling wastewater denitrification treatment system, see Figure 1-2 , the system includes sequentially connected reuse pool 1, primary SBR pool 2 (divided into two compartments: A and B pools), secondary SBR pool 3 (divided into two compartments: A and B pools), discharge pool 4, Several aerators 5 are arranged in the SBR pool, and the aerator is installed at the bottom of the SBR pool, and the aerator is connected with an air inlet pipe 6, and the air inlet pipe 6 is installed on the top of the SB...

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Abstract

The invention discloses a method for denitrification treatment on stainless steel pickling wastewater. The method utilizes a recycling water pool, two SBR pools and a discharge water pool. After removal of heavy metal ions, the pickling wastewater has high total nitrogen content and comprises a large amount of nitrate nitrogen and a small amount of ammoniacal nitrogen. An aerator for stirring water is arranged in the SBR pool, adjusts an oxygen filling amount, controls the denitrification and nitrification processes in the SBR pool and realizes stainless steel pickling wastewater denitrification. The system is free of a mechanical stirring device, simplifies the structure of the SBR pool and system operation management and reduces the maintenance and management work of the electromechanical equipment in the pool.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a nitrogen removal treatment system and method for stainless steel pickling wastewater. Background technique [0002] Due to the needs of the process, stainless steel pickling wastewater often uses a large amount of sulfuric acid, nitric acid and hydrofluoric acid. A stainless steel pickling wastewater / waste liquid resource treatment system is disclosed in the patent CN205635149U. After pre-treatment, the heavy metal ions in the wastewater are eliminated The sediment is removed, and the effluent enters the reuse pool. Part of the effluent from the reuse pool is directly returned to the production line, and the other part of the wastewater is discharged directly after treatment. Nitrate in wastewater mainly exists in the form of calcium nitrate. In order to meet the requirements of discharge standards, it is necessary to carry out biological denitrification t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F103/16
CPCC02F3/302C02F2103/16C02F2305/06
Inventor 张东曙邱立俊李文贞
Owner SHANGHAI SHIYUAN ENVIRONMENT PROTECTION TECH
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