Re: [foxboro] PH controller in Waste Water Treatment

From: "Ken Heywood" <kheywood@xxxxxxxxx>
To: <foxboro@xxxxxxxxxxxxx>
Date: Wed, 22 Mar 2006 03:02:12 -0500
I consulted Harold Skinner, who may just have the most experience of anybody 
who ever crawled around a Parschal flume. His thoughts on the matter of pH 
control:
 
"Foxboro's Greg Shinskey and Tom Myron (and I think Edgar Bristol was in there 
too?) did a lot of the early work in developing control strategies and solving 
application problems with pH control.   They left a legacy of a lot paper 
(several books and many articles) plus patented designs on hardware and 
configurations.  A lot of the early work on the EXACT algorythm was on pH 
applications.  EXACT is available in I/A, and almost any of the control 
strategies that they used can be done in I/A.
Several authors have taken up the drum-beat where they left off, and are now 
self-proclaimed experts.
Successful pH control (especially effluent neutralization) is a combination of 
process design, hardware (sensors, valves, etc.) and  controls strategy (that 
tries to match response to the peculiarities of the process).  The biggest 
problem I have seen is in the extensive knowledge of the process, and of the 
control system, needed by the person setting up the controls.  I haven't seen 
one yet - that you can turn-it-on and walk-away."


        -----Original Message----- 
        From: Balmer, Robert D. [mailto:rbalmer@xxxxxxxxxxxxxxx] 
        Sent: Tue 3/21/2006 1:42 PM 
        To: Foxboro DCS Mail List 
        Cc: 
        Subject: [foxboro] PH controller in Waste Water Treatment
        
        

        Content-Type: text/plain;
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        Does anyone out here on the list have a good I/A controller solution for
        PH control in dealing with waste water?
        
        One of our local talents has come across a MFA PH controller and thinks
        it is the answer to our problems. I just personally have never heard of
        this type of controller.
        
        We have struggled for years using stand alone controller on our effluent
        and are looking for a good solution to stop the struggling.
        
        Thanks in advance for any help.
        
        =20
        
        Robert Balmer
        
        =20
        
        Applications Analyst/Programmer
        
        ISA CCST
        
        Fort Madison Iowa
        
        319 463 2206
        
        rbalmer@xxxxxxxxxxxxxxx
        
        =20
        
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Re: [foxboro] PH controller in Waste Water Treatment

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