Treatment method of stainless steel pickling wastewater

A technology for pickling wastewater and stainless steel, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of ineffective nitrate treatment and high total nitrogen content in effluent

Inactive Publication Date: 2014-01-22
SHAANXI SHENGMAI PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pickling wastewater contains a large amount of nitrate, and the sewage treatment plant of the conventional pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First wash with 0.05 mol / L dilute sulfuric acid for 1 or 2 times, then wash with deionized water, dry and set aside

[0013] Add 0.625 g of reduced iron powder to 250 mL of stainless steel pickling wastewater, control the reaction temperature at 35°C with a water bath, and maintain a constant temperature for 30 minutes with a magnetic stirrer to fully mix and react the wastewater and reduced iron powder, and then pass through a 0.22 μm microporous membrane filtration. The measured nitrate nitrogen removal rate was 90.5%.

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PUM

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Abstract

The invention relates to a wastewater treatment method, and discloses a treatment method of stainless steel pickling wastewater. The treatment method of the stainless steel pickling wastewater comprises the following steps: firstly, using 0.05mol / L dilute sulfuric acid for cleaning iron powder for 1 ~ 2 times, then cleaning with deionized water, drying for standby use; adding the iron powder to the stainless steel pickling waste water for water bath heating, stirring evenly, and filtering with a 0.22 mum microfiltration membrane. The treatment method can remove nitrate in the wastewater, can remove Cu <2+>, Ni <2+>, Cr <6+> and other heavy metal ions to a certain extent, and can be widely used for the repair of nitrate pollution in groundwater.

Description

technical field [0001] The invention relates to a method for treating waste water. Background technique [0002] During the production of stainless steel, a mixed acid of 90-160 g / L nitric acid and 50-60 g / L hydrofluoric acid should be used for pickling. Nitric acid with strong oxidizing properties can oxidize metals and metal oxides to form Cr 3+ , Fe 3+ and Ni 2+ . The metal material taken out from the pickling solution still has a small amount of pickling solution attached to the surface, which must be washed with water, and the rinse water discharged from this is the pickling wastewater. The pickling wastewater contains a large amount of nitrate, and the sewage treatment plant of the conventional process cannot effectively treat the nitrate, resulting in an excessively high total nitrogen content in the effluent. If the pickling wastewater can be treated to a certain extent before it enters the sewage treatment plant, the pressure on the subsequent sewage trea...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/44
Inventor 王耀斌
Owner SHAANXI SHENGMAI PETROLEUM
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