Screw presses for sludge dewatering
How screw presses work
A screw press (SP) provides sludge dewatering by conveying the sludge along the inside of a permeable cylinder. It is based on a slowly-rotating (~5 RPM) Archimedean screw within a cylindrical screen (otherwise termed drum filter/screen or basket). It is normally inclined by ~20° to the horizontal to assist with the draining of water into the sump. The screen generally has an aperture rating below 0.5 mm and is based on wedge-wire or occasionally perforated metal.
The screens are less susceptible to clogging than the filter media used for other thickening and dewatering processes. Consequently, spray-cleaning is applied only intermittently for around 2−4% of the operating time.
As with all thickening and dewatering processes, the product solids (or cake) content is dependent on the feedwater sludge quality. The cake solids content has been shown to be inversely proportional to the volatile solids (VS) of the feed sludge.
Huber Q-PRESS® screw press
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|Sludge origin||% cake solids||% solids capture||Polymer dose − g/kg DS|
|Waste activated sludge (WAS)||15−22||88−95||8.5−11|
|Anaerobically-digested (AD) primary||22−28||≤90||10−17.5|
|Mixed, primary + WAS||25−35||≤90||5−10|
|Mixed, AD primary + WAS||17−25||≤90||10−17.5|
Can it use for sludge from wastewater from coffee roaster processing?
I think you'd have to ask the individual suppliers to see of they have any reference installations.
We are in the market for a screw press for our distillery. Could we please get more information on the presses.
Unfortunately, we don't supply equipment or recommend companies but we are aware that, for example, Huber sells screw presses -
You may wish to contact them? Hope this helps,
Claire (Website Manager)
Thanks above is my e-mail address
Hello Victor - your email address is not visible - please either reply to Kevin below his comment, or you can send me your email address on email@example.com and I will forward it to Kevin for you.
We are looking a sludge dewatering equipment.
Our flow is 2 liter/sec, solid in the mix between 5 and 10%
Please could you send me price and lead time.
Thank you very much
Could you please provide your email address so I can send over more detailed information to you.
Should you have any queries or questions, just let me know?