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Recovering and using technology of water in electroplating

A technology, the technology of reclaimed water, applied in the field of electroplating sewage recycling, can solve the problems of decreasing membrane flux and desalination rate, increasing the cost of reused water, shortening the service life of membrane, etc. amount of effect

Inactive Publication Date: 2005-08-24
海宁市海整整流器有限公司
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AI Technical Summary

Problems solved by technology

Cleaner production requirements of the electroplating industry (comprehensive electroplating) resource utilization indicators in the amount of fresh water is ≤ 0.4T / M 2 , in order to meet the requirements of clean production and realize the comprehensive utilization of resources, relevant research institutions are actively carrying out research on "water recycling technology for electroplating", but basically they are all in the experimental stage, such as filtering water that meets the discharge standard after the above treatment , and then carry out reverse osmosis treatment, but the hydroxide and calcium sulfate generated during the neutralization process cannot be completely precipitated and removed during the filtration process. In the concentration process of reverse osmosis, it is bound to be supersaturated and precipitated, which will cause the reverse osmosis membrane. Fouling, resulting in a decrease in membrane flux and desalination rate, shortening the service life of the membrane, and increasing the cost of reused water

Method used

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  • Recovering and using technology of water in electroplating

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Embodiment 1

[0017] As shown in the accompanying drawing, add sodium hypochlorite which is 7 times of -CN by weight in the cleaning water containing cyanide, to destroy the complex state formed by -CN and metal ions, so that -CN is oxidized, and the metal ions are in a free state; Chromium cleaning water added by weight as Cr 6+ 3.5 times of sodium metabisulfite, adjust the pH to 2.5 so that the Cr 6+ reduced to Cr 3+ ; Then mixed with other cleaning water containing acid, alkali, copper, nickel, etc., it is comprehensive cleaning water. First use a stacked filter to remove impurities with larger particles; then use a yarn core filter to filter and remove tiny particles above 5μ; then pressurize with a high-pressure pump to make the pressure greater than the osmotic pressure, and enter the reverse osmosis treatment; The osmosis treatment uses a neutral and anti-pollution reverse osmosis membrane to remove metal ions and produce RO water; finally, adjust the pH value of the RO water to ne...

Embodiment 2

[0020] As shown in the accompanying drawing, add Cr by weight in chromium-containing cleaning water 6+ 3.5 times the sodium metabisulfite, the Cr 6+ reduced to Cr 3+ ; Then use a laminated filter to filter to remove impurities with larger particles; then use a PP filter element filter to remove tiny particles above 5μ; then pressurize with a high-pressure pump to make the pressure greater than the osmotic pressure and enter the reverse osmosis Treatment, reverse osmosis treatment uses a neutral anti-pollution reverse osmosis membrane to remove metal ions in it to produce RO water; finally adjust the pH value of RO water to 6.8 with sodium hydroxide, which is reuse water. After testing, its conductivity is 125μ, and the desalination rate reaches 95%. This reused water is used in the electroplating cleaning process and can replace clean tap water. The water recycling rate is calculated to be 72%.

[0021] For the concentrated water produced by reverse osmosis treatment, use ...

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Abstract

A process for reusing the reclaimed electroplating sewage includes such steps as decomposing cyanide, reducing, filtering twice, pressurizing, reverse osmosis, neutralizing the RO water, neutralizing concentrated water, and depositing.

Description

technical field [0001] The invention belongs to a sewage recycling technology, in particular to an electroplating sewage recycling technology. Background technique [0002] For a long time, people have believed that water is inexhaustible. Although they also know that water is precious, since it is inexhaustible, it seems to have no value and is not worth cherishing. In the past fifty years, people have only begun to realize that the earth's water resources are poor and have reached a level that cannot be ignored. my country is a country with a shortage of water resources, and the problem of water shortage in cities is particularly prominent. With the acceleration of economic development and urbanization, quite a few cities are currently suffering from serious water shortages. The drought in the past few years has shown the extreme importance and urgency of solving urban water problems, which are directly related to the lives of the people, to soc...

Claims

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Application Information

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IPC IPC(8): C02F9/08C25D21/16
Inventor 钱克邦
Owner 海宁市海整整流器有限公司
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