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Caustic Piping Remedies
When I reviewed our operations, I was struck by how many of our PVC and CPVC piping joints that carried either caustic for wastewater pretreatment or alkaline cleaner exhibited a crusty scale, apparently dried caustic residue.
Ask an Expert Published: 5/1/2011
Phosphates in Wastewater
I am charged with finding the sources of phosphorus in our plant. Our main process effluents are from mass finishing and washing machines. I have not found significant phosphorus in these fluids, and yet, we are close to the limit. What am I missing...
Ask an Expert Published: 1/11/2011
Decontamination of Metal Finishing Area
We have a finishing room at one of our plants, and we have outsourced the plating. We also did pickling and bright dip in the room, and we now want to decontaminate it so that we can sell the equipment, or at least dispose of it properly. Our main c...
Ask an Expert Published: 1/11/2011
Do We Have a Large Load?
We have a captive metal finishing operation and are looking at a process that will have a waste stream with 10,000 ppm Chemical Oxygen Demand at an average flow rate of 4 gal/min that will be discharging into our city’s wastewater treatment facility...
Ask an Expert Published: 1/11/2011
Iron Phosphate-Contaminated Rinsewater Disposal/Recycle
Could you provide us readers with some advice as to the potential to recycle or reuse our waste iron phosphate?
Ask an Expert Published: 1/10/2011
Centrifugal Pump Versus Air-Operated Diaphragm Pump
We have an old wastewater pretreatment system for our metal finishing operation. The system contains two large air diaphragm pumps that transfer the wastewater from a holding tank to the flocculation tank before the clarifier. Since we are renovatin...
Ask an Expert Published: 9/1/2010
Molybdenum Removal from Wastewater Revisited
I have been working for 15 years in the field of water treatment and the problem with molybdenum in wastewater is getting more and more prevalent. We’ve found the following treatment scheme to be successful.
Ask an Expert Published: 3/1/2010
Sulfuric Acid Reporting
Back in 2005, you responded to a question regarding the reporting of sulfuric acid in lead/acid batteries for SARA 302/311/312 reporting. You had estimated that sulfuric acid would be about 18% of the weight of the battery. Is this still a good esti...
Ask an Expert Published: 1/1/2010
Difficulty in Getting Required Permits
How difficult is it to get the required wastewater permits for our discharge? How long does this permitting usually take? Can we start installation of equipment before permits are issued?
Ask an Expert Published: 1/1/2006
Does Discharge Need a Permit
We are planning to install an anodizing system at our facility.
Ask an Expert Published: 1/1/2005

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