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Forum index » Science and Technology » Engineering » Control
Sludge Blanket Levels?
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dyovich@iinet.net.au
science forum beginner


Joined: 07 Jul 2006
Posts: 1

PostPosted: Fri Jul 07, 2006 2:30 pm    Post subject: Re: Sludge Blanket Levels? Reply with quote

On Wed, 7 Jun 2006 16:53:34 +0100, "BIGEYE" <invalid@notathome.com>
wrote:

Quote:
Has anyone had success in measuring sludge blanket levels in Picket Fence
Thickeners as used in the waste water industry?
I have tried single point level detection using light, very little success
with this, and quite often the sensor gets caught in the rake. I am now
using ultrasonic and getting better results. This way I get a continuous
level measurement. However, blanket level detection is sometimes unreliable.
Is there anything better I should consider for this application?
TIA


There is standard equipment made for this application from a number of
manufacturers. Royce in the US has a reliable product, as does Krohne.
Both optical and ultrasonic measurement techniques are satisfactory,
but if your sludge blanket interface is not well defined I suggest you
use the optical technology as it is a better discriminator of the
interface (e.g. in a water clarifier). The ultrasonic is suitable in
wastewater clarifiers or in the alumina industry.

Dennis
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Raj Sreenevasan
science forum beginner


Joined: 24 May 2005
Posts: 12

PostPosted: Sun Jun 11, 2006 12:38 am    Post subject: Re: Sludge Blanket Levels? Reply with quote

Hi,
Have you tried Royce Technologies "Interface Level Analyzers and Sensors"?
This is an Ultrasonic sensor suspended under the water surface in a
Thickener (usually from the rotating or fixed bridge supporting the rake
mechanism). Provides a continues level measurement of the sludge blanket as
well as an additional Clarity (opcaity of the liquid) signal. I have used
them and had success in wate water / mining (Clarifier / Thickener)
applications.

http://roycetechnologies.com/

Regards,
Raj

"BIGEYE" <invalid@notathome.com> wrote in message
news:4486f67f$0$30722$fa0fcedb@news.zen.co.uk...
Quote:
Has anyone had success in measuring sludge blanket levels in Picket Fence
Thickeners as used in the waste water industry?
I have tried single point level detection using light, very little success
with this, and quite often the sensor gets caught in the rake. I am now
using ultrasonic and getting better results. This way I get a continuous
level measurement. However, blanket level detection is sometimes
unreliable.
Is there anything better I should consider for this application?
TIA

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BIGEYE
science forum beginner


Joined: 25 May 2005
Posts: 31

PostPosted: Fri Jun 09, 2006 3:49 am    Post subject: Re: Sludge Blanket Levels? Reply with quote

Thanks.

"Jerry Avins" <jya@ieee.org> wrote in message
news:KZKdnV9R5KNzFBXZnZ2dnUVZ_oSdnZ2d@rcn.net...
Quote:
BIGEYE wrote:
Any info on this?

"Andrew" <andrew.boden@gmail.com> wrote in message
news:1149752222.571196.168280@u72g2000cwu.googlegroups.com...

I'm not familiar with the term "sludge blanket" -- I'm in the upstream
oil and gas industry -- but our mud tanks often have an amount of froth
sitting atop the drilling mud, making accurate measurement of mud
volumes more difficult. In such cases we may use microwave sensors
rather than the usual ultrasonic.

The sludge blankets I knew formed at the bottom of a settling tank. I
haven't heard back from the staff yet. Maybe I'll stop in tomorrow.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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Jerry Avins
science forum Guru


Joined: 03 May 2005
Posts: 534

PostPosted: Thu Jun 08, 2006 8:34 pm    Post subject: Re: Sludge Blanket Levels? Reply with quote

BIGEYE wrote:
Quote:
Any info on this?

"Andrew" <andrew.boden@gmail.com> wrote in message
news:1149752222.571196.168280@u72g2000cwu.googlegroups.com...

I'm not familiar with the term "sludge blanket" -- I'm in the upstream
oil and gas industry -- but our mud tanks often have an amount of froth
sitting atop the drilling mud, making accurate measurement of mud
volumes more difficult. In such cases we may use microwave sensors
rather than the usual ultrasonic.

The sludge blankets I knew formed at the bottom of a settling tank. I
haven't heard back from the staff yet. Maybe I'll stop in tomorrow.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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BIGEYE
science forum beginner


Joined: 25 May 2005
Posts: 31

PostPosted: Thu Jun 08, 2006 7:28 pm    Post subject: Re: Sludge Blanket Levels? Reply with quote

Any info on this?

"Andrew" <andrew.boden@gmail.com> wrote in message
news:1149752222.571196.168280@u72g2000cwu.googlegroups.com...
Quote:
I'm not familiar with the term "sludge blanket" -- I'm in the upstream
oil and gas industry -- but our mud tanks often have an amount of froth
sitting atop the drilling mud, making accurate measurement of mud
volumes more difficult. In such cases we may use microwave sensors
rather than the usual ultrasonic.

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Andrew11
science forum beginner


Joined: 01 Mar 2006
Posts: 16

PostPosted: Thu Jun 08, 2006 7:37 am    Post subject: Re: Sludge Blanket Levels? Reply with quote

I'm not familiar with the term "sludge blanket" -- I'm in the upstream
oil and gas industry -- but our mud tanks often have an amount of froth
sitting atop the drilling mud, making accurate measurement of mud
volumes more difficult. In such cases we may use microwave sensors
rather than the usual ultrasonic.
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Cameron Dorrough
science forum Guru Wannabe


Joined: 09 May 2005
Posts: 103

PostPosted: Wed Jun 07, 2006 10:34 pm    Post subject: Re: Sludge Blanket Levels? Reply with quote

"BIGEYE" <invalid@notathome.com> wrote in message
news:4486f67f$0$30722$fa0fcedb@news.zen.co.uk...
Quote:
Has anyone had success in measuring sludge blanket levels in Picket Fence
Thickeners as used in the waste water industry?
I have tried single point level detection using light, very little success
with this, and quite often the sensor gets caught in the rake. I am now
using ultrasonic and getting better results. This way I get a continuous
level measurement. However, blanket level detection is sometimes
unreliable.
Is there anything better I should consider for this application?
TIA

All the plants I've seen use ultrasonic. Hawk (www.hawklevel.com) make a
range of ultrasonic level transmitters for waste-water applications and
they're very easy to set up and pretty reliable.

Another option is something from Drexelbrook. They have a wide range of
contact-type magnetostrictive transmitters which can discriminate between
the blanket and the water underneath and it might be worth talking to one of
their reps..

HTH,
Cameron:-)
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Jerry Avins
science forum Guru


Joined: 03 May 2005
Posts: 534

PostPosted: Wed Jun 07, 2006 4:14 pm    Post subject: Re: Sludge Blanket Levels? Reply with quote

BIGEYE wrote:

Quote:
Has anyone had success in measuring sludge blanket levels in Picket Fence
Thickeners as used in the waste water industry?
I have tried single point level detection using light, very little success
with this, and quite often the sensor gets caught in the rake. I am now
using ultrasonic and getting better results. This way I get a continuous
level measurement. However, blanket level detection is sometimes unreliable.
Is there anything better I should consider for this application?
TIA

I've asked the staff at my local sewerage authority if that have a
suggestion for you. I'll forward a response if it's pertinent.

Jerry
--
Engineering is the art of making what you want from things you can get.
ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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BIGEYE
science forum beginner


Joined: 25 May 2005
Posts: 31

PostPosted: Wed Jun 07, 2006 3:53 pm    Post subject: Sludge Blanket Levels? Reply with quote

Has anyone had success in measuring sludge blanket levels in Picket Fence
Thickeners as used in the waste water industry?
I have tried single point level detection using light, very little success
with this, and quite often the sensor gets caught in the rake. I am now
using ultrasonic and getting better results. This way I get a continuous
level measurement. However, blanket level detection is sometimes unreliable.
Is there anything better I should consider for this application?
TIA
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Google

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