7 replies to this topic

[Duriyan]

HI,
I am a student in Chemical Engineering. I would like to have some help in Domestic Wastewater treatment plant design. I am looking for Anaerobic digestion and Mechanical dewatering designs.
If any one could assest i will appresiate.
Regards

[Zauberberg]

There is a book titled "Water treatment plant design" by Edward Baruth, and published by McGraw-Hill. You might want to go through it.

http://www.knovel.co...LAY_bookid=1651

[golden_gate]

Hi,

I've very limited experience but I've found metcalf and eddy's wastewater treatment to be very helpful
http://www.amazon.ca...y/dp/0070418780

Quite sure they cover a section on anaerobic digestion but not too sure about mechanical dewatering (sludge dewatering by centrifuge i presume?)
Is there a specific sort of help that you're after?

Regards,

[Duriyan]

'golden_gate', on 06 Mar 2011 - 08:12 AM, said:

Hi,

I've very limited experience but I've found metcalf and eddy's wastewater treatment to be very helpful
http://www.amazon.ca...y/dp/0070418780

Quite sure they cover a section on anaerobic digestion but not too sure about mechanical dewatering (sludge dewatering by centrifuge i presume?)
Is there a specific sort of help that you're after?

Regards,

Hi
I am not sure of the best processes to use in anerobic digestion. Many books provides different ways to process the sludge. Could you specifically recommend any process?

[arsentatar]

Hi
you can look this book,

Handbook of Water and Wastewater Treatment Technologies
Nicolas P. Cheremisinoff
Pollution Engineering

if u want I have this book in pdf
give me your e-mail adress and ı can send for u

[golden_gate]

Hi again,

Usually when we speak of anaerobic digestion (proven designs that would work rather than a novel / new technology), it is divided into two broad categories based on the operating temperatures: mesophilic (about 35 deg C) and thermophilic ( about 45 deg C). From what I've heard, thermophilic digestion is much more effective (higher biogas production, greater destruction of solids) but of course comes with a higher operating cost ( requires more heating / utility ) and capital cost (materials and construction). I think mesophilic digestion has proven to be a reliable technology with less risks associated.

I'm not too sure if this was what you were after?

[JALR]

'Zauberberg', on 03 Mar 2011 - 8:35 PM, said:

There is a book titled "Water treatment plant design" by Edward Baruth, and published by McGraw-Hill. You might want to go through it.

http://www.knovel.co...LAY_bookid=1651

This links could be helpful:
http://water-observa...twtrengbok.html
http://water-observa...rforsewbok.html

In the first , Chapter 14-9 and 14-13 you can find design information for Anaerobic digestion and sludge dewatering.

In the second you can find design criteria approved by the state of Washington.

Hope this is helpful

[JALR]

'golden_gate', on 08 Mar 2011 - 09:45 AM, said:

Hi again,

Usually when we speak of anaerobic digestion (proven designs that would work rather than a novel / new technology), it is divided into two broad categories based on the operating temperatures: mesophilic (about 35 deg C) and thermophilic ( about 45 deg C). From what I've heard, thermophilic digestion is much more effective (higher biogas production, greater destruction of solids) but of course comes with a higher operating cost ( requires more heating / utility ) and capital cost (materials and construction). I think mesophilic digestion has proven to be a reliable technology with less risks associated.

I'm not too sure if this was what you were after?

Even when thermophilic design have inreased solids and bacterial destruction and is faster, it has less process stability, higher energy requirements and some odor concern.

For the sizing required, consider 20 days of solids retention time (SRT) for a 24°C design, or 10 days SRT for a 35-40°C model (14 dys for 30°C). You can expect 60% of volatile solids reduction with 30 days SRT, or 60% for 20 days or 56% for 15 days. feed Volatile solids content is about 70% of total solids, so overall solids destruction expected would be 40 to 50 % of total solids feed.

The digester must be complete mix and you can use biogas mixing or pump recirculation or mechanical mixing for this purpouse. Also external heat exchangers are recommended for heat feed, and you can use the biogas energy for this.
the 10 states standards can help you for design parameters. Hope this can be helpful

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