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Clean Wastewater Attacking Zinc Plate
We use ion exchange treatment for wastewater from our nickel, hexavalent chrome and zinc plating rinses. What kind of characterization should we do to identify the pollutants that are affecting our products, and what steps are needed to reuse this w...
Ask an Expert Published: 2/21/2013
Chrome Reduction
What is the best way to reduce hexavalent chrome to trivalent chrome from an aluminum conversion coating rinse water?
Ask an Expert Published: 1/7/2013
Nickel Recovery from Filter Press Cake
Is the recovery of nickel metal from waste sludge considered recycling, reusing or reclaiming?
Ask an Expert Published: 1/2/2013
Floating Floc Causing Issues
We are a contract finisher with anodizing, alkaline zinc plating, electrocoat and powder coat capabilities. Our processes are well-established, but a few days ago we suddenly experienced floc rising, rather than settling, in our waste treatment. Wha...
Ask an Expert Published: 10/25/2012
Waste Treatment for Paint Stripping
How can we remove paint sludge and color and neutralize the pH from paint stripping acid before discharging waste to a storm drain?
Ask an Expert Published: 9/6/2012
Arc Flash PPE Selection
I’ve been hearing a lot about arc flash protection lately, but I’m not sure if it applies to our operation and, if so, what the requirements are for providing personal protective equipment under this standard. I know it has something to do with our ...
Ask an Expert Published: 7/2/2012
Am I a DOT Hazmat Transporter?
I have heard through the grapevine that the U.S. Department of Transportation has inspected one of our competitors regarding hazardous materials registration requirements. Can you give this small metal finishing shop owner an overview on how this wo...
Ask an Expert Published: 5/2/2012
More PVC Pipe Glue Discussion
I would like to comment on the ongoing pipe glue discussion from your November 2011 column. Users concerned about caustic service could look for what one manufacturer calls “industrial PVC cement” which is made without the fumed silica thickener. Fo...
Ask an Expert Published: 3/1/2012
Effects of Proposed Label Changes
Over the last year, we have received several correspondences regarding the Occupational Safety & Health Administration’s (OSHA) proposal to modify the existing HazCom standard to conform to the United Nations Globally Harmonized System (GHS) of clas...
Ask an Expert Published: 2/29/2012
Nitrites and Fragrances
We are using a vibratory finishing compound that has been satisfactory for more than 20 years. Recently, a potential new vendor pointed out that it contains sodium nitrite and said we are violating the law in using it. We checked with our supplier, ...
Ask an Expert Published: 1/26/2012

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