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Zero discharge treatment method for wastewater of lead-acid battery

A lead-acid battery and treatment method technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc. The problem of low utilization rate, etc., to achieve the effect of stable sodium ion content, less environmental damage, and low production cost

Active Publication Date: 2014-07-23
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The disadvantages of this method are: Ca(OH) 2 Low solubility, use excess Ca(OH) 2 Only in this way can it be well neutralized to precipitate the lead ions in the water; a large amount of CaSO 4 Precipitation and Ca(OH) 2 Solids and lead-containing substances are mixed together and cannot be separated, resulting in a large amount of lead-containing waste; the operation cannot be automated; nanofiltration or other purification treatments cannot be performed, and the water reuse rate is very low
[0010] The invention of CN101197458A discloses a recycling and treatment process for waste lead-acid batteries. Lead-containing wastewater is directly introduced into an ordinary wastewater treatment system for wastewater treatment. The operation is simple, but because most of the ordinary wastewater treatment systems are activated sludge methods, microorganisms cannot degrade lead. Enriched in microorganisms, it will destroy the purification effect of microorganisms

Method used

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  • Zero discharge treatment method for wastewater of lead-acid battery

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Effect test

Embodiment 1

[0049] A zero-discharge treatment method for lead-acid battery wastewater, such as figure 1 shown, including the following steps:

[0050] (1) Primary sedimentation: lead-acid battery wastewater is introduced from the bottom of the primary sedimentation tank, passes through the inclined tube sedimentation area (using the existing conventional layout method), is discharged from the upper part of the primary sedimentation tank into the regulating tank, and the lead at the bottom of the primary sedimentation tank is collected. Sludge is discharged into the sludge tank.

[0051] (2) Neutralization reaction: NaOH solution is passed into the regulating tank to adjust the pH of the wastewater to 5. NaOH solution is obtained using step (5) Ba(OH) 2 The solution is carried out with the reaction product NaOH in the water after the sulfate ion precipitation reaction. If NaOH is not enough to achieve complete neutralization, an additional part of NaOH needs to be added to adjust the pH ...

Embodiment 2

[0058] A zero-discharge treatment method for lead-acid battery wastewater, comprising the steps of:

[0059] (1) Primary sedimentation: The lead-acid battery wastewater is introduced from the bottom of the primary sedimentation tank, passes through the inclined tube sedimentation area, is discharged from the upper part of the primary sedimentation tank into the regulating tank, and the lead sludge at the bottom of the primary sedimentation tank is collected and discharged into the sludge tank.

[0060] (2) Neutralization reaction: NaOH solution is passed into the regulating tank to adjust the pH of the wastewater to 8. NaOH solution is obtained using step (5) Ba(OH) 2 The solution is carried out with the reaction product NaOH in the water after the sulfate ion precipitation reaction. If NaOH is not enough to achieve complete neutralization, an additional part of NaOH needs to be added to adjust the pH value, and finally adjust the pH of the wastewater to the set value.

[006...

Embodiment 3

[0073] A zero-discharge treatment method for lead-acid battery wastewater, comprising the steps of:

[0074] (1) Primary sedimentation: The lead-acid battery wastewater is introduced from the bottom of the primary sedimentation tank, passes through the inclined tube sedimentation area, is discharged from the upper part of the primary sedimentation tank into the regulating tank, and the lead sludge at the bottom of the primary sedimentation tank is collected and discharged into the sludge tank.

[0075] (2) Neutralization reaction: NaOH solution is passed into the regulating tank to adjust the pH of the wastewater to 7.

[0076] NaOH solution is obtained using step (5) Ba(OH) 2 The solution is carried out with the reaction product NaOH in the water after the sulfate ion precipitation reaction. If NaOH is not enough to achieve complete neutralization, an additional part of NaOH needs to be added to adjust the pH value, and finally adjust the pH of the wastewater to the set value...

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Abstract

The invention discloses a zero discharge treatment method for wastewater of a lead-acid battery. The method disclosed by the invention mainly comprises the following steps: primary sedimentation; neutralization reaction; flocculent precipitation; rinsing treatment; sulfate radical precipitation reaction; and filter-pressing of sludge. According to the method disclosed by the invention, in the treatment process, sodium hydroxide is recycled, and the sodium ion content in the whole treatment system is relatively stable and sodium ions are not accumulated. The main process sequentially includes conversion from sodium hydroxide to sodium sulfate and conversion from sodium hydroxide to sodium hydroxide. In the method, a flocculant is used for complexing, flocculating and removing impurities such as calcium, magnesium and iron ions in wastewater, and water can be reused to realize the zero discharge of water. Barium hydroxide consumed in the treatment process finally generates barium sulfate and then barium sulfate is converted into barium hydroxide to be recycled. The whole treatment process is low in production cost and low in energy consumption, hardly causes environmental risk and is suitable for industrial production.

Description

technical field [0001] The invention relates to a treatment method for lead-acid battery wastewater, in particular to a zero-discharge treatment method for lead-acid battery wastewater. Background technique [0002] A large amount of acidic heavy metal industrial wastewater is produced in the production process of lead-acid batteries. If it is discharged without treatment, it will inevitably bring great harm to the environment and society. Lead and cadmium in wastewater are heavy metal elements and are a class of pollutants. The discharge outlets of workshops or workshop treatment facilities must meet the discharge requirements. Therefore, the treatment and comprehensive utilization of battery industrial wastewater is an important task for environmental protection. It is important for ensuring People's health and the orderly development of industrial and agricultural production are of great significance. [0003] At present, the treatment methods for heavy metal wastewater ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/12
Inventor 刘孝伟
Owner CHAOWEI POWER CO LTD
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