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Treatment method suitable for acidic rinsing wastewater in metal processing process

A metal processing and treatment method technology, applied in the field of water treatment, can solve the problems of additives, polluted raw materials, recycle of difficult acid rinsing wastewater, etc.

Inactive Publication Date: 2018-11-06
苏州聚微环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the above, it can be found that, first, this treatment method is difficult to completely recycle the acidic rinse wastewater, but it needs to be determined according to the situation. into the municipal pipe network, but there will still be ferrous ions, sodium chloride, etc. in it, and the discharge will not only bring some pollution but also cause a great waste of raw materials; second, due to the operation method of step 6, this treatment method It is difficult to truly realize the cycle of the system, and the situation of adding raw materials will often appear, which is not conducive to saving costs

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  • Treatment method suitable for acidic rinsing wastewater in metal processing process
  • Treatment method suitable for acidic rinsing wastewater in metal processing process

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Hydrochloric acid pickling:

[0046] During the galvanizing production process of a certain factory, hydrochloric acid is used for pickling, and the pH of the generated acidic rinsing wastewater is 2.5, which is passed into the first acid pool; the wastewater is pumped into the first adjustment pool, and the pH value is adjusted to 7.1, and use a blower to aerate, so that all the sediment is converted into ferric hydroxide; then enter the first inclined plate sedimentation tank, the ferric hydroxide sinks to the bottom, and is discharged into the first sludge tank for treatment; the upper part of the first inclined plate sedimentation tank The clear liquid is a sodium chloride salt solution with a TDS content of 3800mg / L, which enters the first ultrafiltration (using ceramic membrane) system for treatment; the first concentrated water obtained by the ceramic membrane treatment is discharged into the first sludge tank for treatment, and the ceramic membrane The TDS conte...

Embodiment 2

[0049] Hydrochloric acid pickling:

[0050] During the galvanizing production process of a certain factory, hydrochloric acid is used for pickling, and the pH of the generated acidic rinsing wastewater is 2, which is passed into the first acid pool; the wastewater is pumped into the first adjustment pool, and the pH value is adjusted to 6.9, and use a blower to aerate, so that all the sediment is converted into ferric hydroxide; then enter the first inclined plate sedimentation tank, the ferric hydroxide sinks to the bottom, and is discharged into the first sludge tank for treatment; the upper part of the first inclined plate sedimentation tank The clear liquid is a sodium chloride salt solution with a TDS content of 3360mg / L, and enters the first ultrafiltration (using ceramic membrane) system for treatment; the first concentrated water obtained by the ceramic membrane treatment is discharged into the first sludge tank for treatment, and the ceramic membrane The TDS content o...

Embodiment 3

[0053] Sulfuric acid pickling:

[0054]During the galvanizing production process of a certain factory, sulfuric acid is used for pickling, and the pH of the generated acidic rinsing wastewater is 1.5, which is passed into the second acid pool; the wastewater is pumped into the second adjustment pool, and the pH value is adjusted to 7.0 with sodium hydroxide , and use a blower to aerate, so that all the sediment is converted into ferric hydroxide; then enter the second inclined plate sedimentation tank, the ferric hydroxide sinks to the bottom, and is discharged into the second sludge tank for treatment; the supernatant of the second inclined plate sedimentation tank Liquid is sodium sulfate salt solution, TDS content is 5680mg / L, enters the second ultrafiltration (using ceramic membrane) system to process; The TDS content of the first product water is 5680mg / L, and then through the nanofiltration system (using cross-linked aromatic polyamide anti-fouling nanofiltration membran...

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Abstract

The invention discloses a treatment method suitable for acidic rinsing wastewater in a metal processing process. The treatment method comprises the steps: 1, neutralizing the wastewater by alkali, then treating in an inclined plate sedimentation tank and separating to obtain ferric hydroxide precipitate and supernatant; 2, performing ultrafiltration treatment on the supernatant and separating to obtain first produced water and first concentrated water; 3, when the wastewater is obtained by hydrochloric acid treatment, performing reverse osmosis treatment on the first produced water and separating to obtain second produced water and second concentrated water; when the wastewater is obtained by sulfuric acid treatment, firstly performing nanofiltration treatment on the first produced water,separating to obtain third produced water and third concentrated water, then performing reverse osmosis treatment on the third produced water and separating to obtain fourth produced water and fourthconcentrated water; 4, utilizing a bipolar membrane to treat the second concentrated water or the third concentrated water and obtaining a hydrochloric acid or sulfuric acid solution, a sodium hydroxide solution and fresh water after treatment. The treatment method disclosed by the invention can achieve full reclamation of raw materials and further can achieve zero emission of three wastes.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to the treatment of acidic rinsing wastewater, in particular to a treatment method suitable for acidic rinsing wastewater in metal processing. Background technique [0002] In recent years, with the increase of national infrastructure investment, the steel and steel product processing industry has developed rapidly, and the hot-dip galvanizing process that has good protection against steel corrosion has been widely used. However, the hot-dip galvanizing process is a water-consuming process. A large amount of acidic rinsing wastewater will be produced during production. The acidic rinsing wastewater mainly comes from the rinsing water after pickling of iron and steel products. Pipelines and underground structures cause damage, and entering the water body will also affect the pH value of the water body, destroy the self-purification ability of the water body, and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/16
CPCC02F1/441C02F1/442C02F1/444C02F1/4693C02F1/52C02F1/66C02F9/00C02F2103/16
Inventor 王伟叶圣武周烽葛方明费建建冯强陈远远
Owner 苏州聚微环保科技有限公司
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