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Plating Waste Water Technologies |
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As worldwide environmental legislation tightens and the producer responsibility concept is adopted in law, Printed Circuit Board (PCB) manufacturers are seeking more cost effective solutions for their waste and wastewater treatment to comply with local regulations.
We have extensive knowledge and expertise in the wastewater treatment for PCB and plating manufacturing industries.
Complexed Heavy Metals and COD Problems In PCB Wastewater
The PCB and plating manufacturing industries generate a variety of production wastes. Most significantly, the PCB wastewater contains heavy metals with varying pH levels from generated from the processes associated with etching, film developing, black oxide, plating, rinsing processes. The heavy metals are primarily copper but also tin, lead, nickel, gold, silver, cyanide, etc.
These heavy metals laden wastewater have the following common characteristics, |
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The heavy metals are electrochemically bonded with complexing agent (etchant, or chelating agents) such as ammonia. Normal waste water treatments, like the addition of hydroxide, which are effective on dropping free heavy metals such as copper, are ineffective on removing heavy metals bonded with complexing agents.
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Waste streams from all the processes in most PCB fabrication facilities are mixed together, and consequently waste treatment to remove heavy metals becomes either very difficult, or very expensive, or both.
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In additional to heavy metals problems in wastewater, Chemical Oxygen Demand (COD) is another major pollutant in the PCB wastewater. The sources of the COD comes from photoresist wastewater as well as the rinsing process from plating and etching.
Our specific area of knowledge and products for PCB and plating wastewater treatment are,
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Turn Key Continuous and Batch treatment system for PCB wastewater
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Water recycle and reuse
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Precious metal recovery
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Heavy Metal Removal
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Chromium Reduction
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Cyanide Destruct
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pH Control
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Reduction in BOD, COD & TSS.
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