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Electroplating wastewater reclaimed water recycling process and system

A technology for electroplating wastewater and reclaimed water, applied in water/sewage treatment, metallurgical wastewater treatment, water/sewage multi-stage treatment, etc. Achieve the effect of reducing conductivity, strong precipitation ability and good removal effect

Inactive Publication Date: 2017-05-24
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Using this method, if the amount of concentrated water reused is large (greater than 15% of the influent), the quality of the system’s influent water will become worse and worse, eventually leading to fouling of the membrane.
If the amount of discharged water is large, the recovery rate of the system cannot meet the requirements, and regardless of the above two methods, the fouling of the system will inevitably exist and it will be difficult to clean

Method used

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  • Electroplating wastewater reclaimed water recycling process and system
  • Electroplating wastewater reclaimed water recycling process and system

Examples

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Embodiment Construction

[0039] like figure 1 As shown, a water reuse system for electroplating wastewater provided in this embodiment includes a cleaning wastewater collection tank, a filtration system one, a filtration system two, a reverse osmosis system, a concentrated water collection tank, and a concentrated water collection tank arranged in sequence along the direction of water flow. water sedimentation tank;

[0040] The cleaning wastewater collection pool is used to collect the reclaimed water to be treated; the first filter system is a sand filter or ultrafiltration system, which is used to filter the reclaimed water to be treated for the first time;

[0041] The second filtration system is a sand filtration or ultrafiltration system, which is used for the second filtration of the reclaimed water to be treated;

[0042] The reverse osmosis system treats the wastewater after the second filtration; the standardized water production of a single membrane is designed according to 0.3-0.4T / h, an...

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Abstract

The invention provides an electroplating wastewater reclaimed water recycling process which is characterized by comprising the following steps: performing sand filtration or ultra-filtration on wastewater to be treated at least twice, feeding into a reverse osmosis system, collecting and depositing concentrated water treated by using the reverse osmosis system, discharging and / or combining into the wastewater to be treated, and performing further treatment, wherein the reagent for the deposition treatment is a heavy metal chelating agent. By adopting the electroplating wastewater reclaimed water recycling process, sewage blocking of the reverse osmosis system can be remarkably reduced, and the system recycling rate can be remarkably increased.

Description

technical field [0001] The invention relates to the field of wastewater treatment methods and equipment, in particular to a process and system for recycling water in electroplating wastewater. Background technique [0002] Although wastewater containing heavy metals and organic substances from electroplating plants can meet the national discharge standards, due to the large amount of water, the country's water requirements for enterprises, energy conservation and emission reduction, some of the better water quality is generally selected for reuse in production, such as cleaning wastewater. The main process of recycling is generally reverse osmosis. Although reclaimed water can be discharged up to the standard, its composition is still very complex, its conductivity is high, and its hardness, metal ions, turbidity and COD cannot meet the requirements of reverse osmosis membrane water intake, which can easily cause serious fouling or oxidation of the membrane system. Difficul...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/001C02F1/441C02F1/444C02F1/54C02F9/00C02F2103/16
Inventor 张金山夏志先魏华炜杨厚连
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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