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RE: aluminum anodizing; sulfuric acid process



Title: Fwd: aluminum anodizing; sulfuric acid process
Hi Laura,
 
Short of a source test, I doubt you will find any exact empirical equation for estimating air emissions.  Electroplating operations are a little different because gas evolution is mainly a function of electrical input. In anodizing, any gas evolution will be a function of surface area and history (I'm guessing gas evolution will decline as the oxide layer forms).
 
All of this said, I suggest Steve get a copy of the "Electroplating Engineering Handbook" by Durney.  There is a chapter on ventilation system design and it provides guidance on the offgassing rates of many different electroplating solutions.  Based on health hazard and the offgassing rate (high, medium, or low), suggested ventilation rates are provided.  Keep in mind that these are minimum rates and OSHA regulations are likely to specify a higher rate.
 
Since you're dealing with an acid mist, treatment usually consists of passing the exhaust through a demister pad.  Solutions with a high offgassing rate will require a water wash spray to periodically clean the pad.  Medium or low offgassing solutions might not require the spray but be cleaned during annual maintenance.  A check with the companies that sell demister pads would be a likely way to identify emission rates and source test data.
 
If I find any specific data, I'll make another post. 
 
Mike Callahan
-----Original Message-----
From: owner-p2tech@great-lakes.net on behalf of Laura L. Barnes
Sent: Fri 3/14/2008 10:13 AM
To: p2tech@great-lakes.net
Cc: sahackney@deq.virginia.gov
Subject: Fwd: aluminum anodizing; sulfuric acid process

I'm posting this inquiry at the request of Steve Hackney at the
Virginia Department of Environmental Quality. He isn't subscribed to
P2Tech, so please copy sahackney@deq.virginia.gov on your reply.

Thanks for your help!

Laura B.

>>Subject: aluminum anodizing; sulfuric acid process
>>Date: Wed, 12 Mar 2008 15:22:55 -0400
>>X-MS-Has-Attach: yes
>>X-MS-TNEF-Correlator:
>>Thread-Topic: aluminum anodizing; sulfuric acid process
>>Thread-Index: AciEdnj50Q0t899STEKIgysoi9Q86g==
>>From: "Hackney,Stephen" <sahackney@deq.virginia.gov>
>>To: <riyaz@wmrc.uiuc.edu>
>>X-OriginalArrivalTime: 12 Mar 2008 19:22:55.0067 (UTC)
>>FILETIME=[78F94AB0:01C88476]
>>X-ME-Bayesian: 0.000000
>>
>>I'm looking for data on air emissions from this type of metal
>>finishing process.  EPA seems to have no data for this type of
>>metal finishing.  My objective is to calculate the air emissions of
>>sulfuric acid mist and particulate for this process.  An industrial
>>facility in Virginia has requested a construction permit to install
>>this type of metal finishing line.
>>Thanks...   Steve...
>>
>>
>>Stephen A. Hackney
>>Virginia Dept. of Environmental Quality
>>5636 Southern Blvd.
>>Virginia Beach, VA 23462
>>757-518-2124 fax-757-518-2009
>>email: sahackney@deq.virginia.gov
>
>---
>Laura L. Barnes, Librarian                           (v) (217) 333-8957
>Illinois Waste Management & Research Center          (f) (217) 333-8944
>One East Hazelwood Drive, Champaign IL
>61820         e-mail:lbarnes@wmrc.uiuc.edu
>Visit us on the web at http://www.wmrc.uiuc.edu/library/
>Ask the WMRC Librarian:
>http://www.questionpoint.org/crs/servlet/org.oclc.admin.BuildForm?&institution=12101&type=1&language=1


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