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Stainless steel pickling waste water/liquid waste resourceful treatment method and system

A technology for pickling wastewater and treatment methods, which is applied in water/sewage treatment, metallurgical wastewater treatment, neutralized water/sewage treatment, etc., and can solve the problem that sewage cannot fully meet the discharge standards, the reuse rate of reclaimed water cannot be guaranteed, and sludge cannot proper handling of issues

Inactive Publication Date: 2016-04-13
SHANGHAI SHIYUAN ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the sewage in the existing pickling wastewater / waste liquid treatment process cannot fully meet the discharge standards, the reuse rate of reclaimed water cannot be guaranteed, and the sludge cannot be properly disposed of due to excessive heavy metals.

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  • Stainless steel pickling waste water/liquid waste resourceful treatment method and system
  • Stainless steel pickling waste water/liquid waste resourceful treatment method and system
  • Stainless steel pickling waste water/liquid waste resourceful treatment method and system

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Embodiment Construction

[0042] The following will combine figure 2 The stainless steel pickling wastewater / waste liquid resource treatment method and system provided by the present invention are described in detail, which is an optional embodiment of the present invention. It can be considered that those skilled in the art will not change the spirit and content of the present invention. Be able to revise and polish it.

[0043] Before setting forth the design of the present invention, the following table has listed the water quality of the pickling waste acid liquor and flushing waste water of electric property:

[0044] Waste acid water quality

[0045] project

The amount of substance concentration mol / L

h 2 SO 4 Sulfate ion in the form of sulfuric acid

1.84

Fe 2+

1.07

Ni 2+

0.10

Cr 3+

0.23

mn 2+

0.11

SO 4 2- Total

3.47

[0046] PH value: less than 0.7

[0047] Washing waste water quality

[0048] ...

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Abstract

The invention provides a stainless steel pickling waste water / liquid waste resourceful treatment method and system. The method includes the steps that washing wastewater and waste acid liquid which are generated by stainless steel pickling are treated respectively; first-stage neutralized sedimentation is conducted on the washing wastewater, then second-stage neutralized sedimentation is conducted on the precipitating washing wastewater, aeration is conducted on the washing wastewater during second-stage neutralized sedimentation, the waste acid liquid is mixed with sludge generated during first-stage neutralized sedimentation when the washing wastewater is treated, then first-stage neutralization of the waste acid liquid is achieved, second-stage neutralization is carried out on the waste acid liquid subjected to first-stage neutralization, and aeration is conducted on the waste acid liquid during second-stage neutralization.

Description

technical field [0001] The invention relates to the field of stainless steel production, in particular to a method and system for recycling stainless steel pickling wastewater / waste liquid. Background technique [0002] Due to the needs of the stainless steel industry chain, crude stainless steel products must undergo pickling and passivation processes. A large amount of sulfuric acid, nitric acid, and hydrofluoric acid are used in the process, and some processes also use a large amount of sodium nitrate and sodium chloride. In addition, the current pickling workshop is relatively extensive in operation, resulting in complex components of pickling wastewater / waste liquid. The main hazard of pickling wastewater / waste water is corrosion of sewer pipes and reinforced concrete and other hydraulic structures, and infiltration into the soil will cause soil calcification. In addition, heavy metals such as iron, nickel, chromium, and manganese contained in waste water / waste water a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/14C02F11/12C02F103/16
CPCC02F9/00C02F1/52C02F1/645C02F1/66C02F1/74C02F3/28C02F11/122C02F2103/16C02F2301/08
Inventor 张东曙甘宝鹏
Owner SHANGHAI SHIYUAN ENVIRONMENT PROTECTION TECH
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