Water and Wastewater.com Help Forums - ACTIVATED SLUDGE DEWATERING

Outop YaBB Newbies Offline I love Water and Wastewater.com Posts: 2 Gender: Company or Organization: Private	ACTIVATED SLUDGE DEWATERING Feb 09^th, 2012, 6:31am Has anyone any experience with the equipment in the link hereunder? http://www.vor-env.com/sludgedehydrator.shtml
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D.M. Linton

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Re: ACTIVATED SLUDGE DEWATERING
Reply #1 - Feb 9^th, 2012, 5:44pm

I have limited experience - dewatering waste activated sludge in an industrial WWTP and de-watering aluminum hydroxide.

These screw presses can work very well (typical) or very poorly. Pilot testing in your environment is crucial. If the feed sludge varies much, the chemical feed needs vary to as well (obviously) and sometimes the timing of chemical feed adjustments can be quite sensitive.
If the chemical contact and flocculation tank were larger, it would reduce the machine's sensitivity to variations in feed sludge quality.

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grrun

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Re: ACTIVATED SLUDGE DEWATERING
Reply #2 - Feb 9^th, 2012, 9:42pm

While I have no experience with this particular dewatering device; I have had experience with a screw press. As the previous poster has stated, these devices are quite sensitive to polymer additions (too much or too little polymer additions and the floc doesn't form clumps for releasing the water). That being said, if the sludge characteristics change, then a polymer adjustment may be necessary for continued satisfactory operation.

grrun

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Geoff

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Re: ACTIVATED SLUDGE DEWATERING
Reply #3 - Feb 12^th, 2012, 8:31pm

I commissioned and operated a 25m3/hour unit last year.

The unit seemed very sensitive to polymer strength and performed quite poorly when there were any polymer dosing issues. Cake quality was always below what the manufacturer suggested the machine should achieve - I think this may have been due to the very poor settling sludge we were trying to process.

The big pluses are small footprint and very low energy use - but if the output is well below par then such details are academic

I'd say get the supplier to rent you one and trial it on the sludges you have.

Cheers

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yusuf ziya YaBB Newbies Offline I love Water and Wastewater.com Posts: 2 Company or Organization: Aykosan Mühendislik	Re: ACTIVATED SLUDGE DEWATERING Reply #4 - Apr 23^rd, 2012, 3:24am this kind of equipments are used for primary treatment dust like mechanical bar screen outputs. you should use filter press, belt press or decanter for your activated sludge.
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joseph YaBB Newbies Offline Water and Wastewater.com is the best! Posts: 2	Re: ACTIVATED SLUDGE DEWATERING Reply #5 - May 5^th, 2012, 9:13pm it is rather more advance than all the old ways. in terms of dealing with sludge. there are many differnt types of design and handling issues. anyway, if anybody has the fish ball making experience, they will know where is whole idea from. you will like it once you use it.
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RASKRIVUSHKIN

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Re: ACTIVATED SLUDGE DEWATERING
Reply #6 - May 22^nd, 2012, 1:54pm

Concerning the sludge dewatering for small municipal wastewater treatment facilities as well as sludge dewatering of industrial WWTP (food industry, petrochemical industry, etc.) such units are the best solution.
Main advantages are not only small energy consumption, but also very small demand in volume and pressure of wash water (up to 150 l/h with 1-2 bar).
Also rotation speed of the screw is not more than 10 rpm, that is why suppliers insist that operation life of the screw (the main dewatering part of the dehydrator) can be up to 30'000 hours.

To decrease influence of different concentrations of DS in initial sludge you should use the models of sludge dehydrators with collecting chamber with mixing pump inside, included into the construction of dewatering unit.
For example, like this:

http://www.ekoton.com/index.php?option=com_content&view=article&id=178&Itemid=384&lang=en

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« Last Edit: May 23^rd, 2012, 7:33am by RASKRIVUSHKIN »

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Tom Keenan - nesa God Member Offline Environmental Consultant - contact info@nesa.ie Posts: 2103 Gender: Company or Organization: nesa environmental consultants	Re: ACTIVATED SLUDGE DEWATERING Reply #7 - May 23^rd, 2012, 4:52am This equipment is in effect another type of sludge de-watering unit. In my experience it suffers from similar issues to other de-watering units, such as susceptibility to poly dosing. It does have the advantage of being low in power consumption, slow moving, smaller footprint, and low volumes of wash water.
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TobyChen YaBB Newbies Offline I love Water and Wastewater.com Posts: 2 Company or Organization: Kintep	Re: ACTIVATED SLUDGE DEWATERING Reply #8 - May 25^th, 2012, 8:39pm the kind of sludge dehydrator is the most advanced dewatering machine now, and i'm very familiar with it. You've got one? bought it from VoR environmental? If you have any questions, please feel free to contact me.
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RASKRIVUSHKIN YaBB Newbies Offline I love Water and Wastewater.com Posts: 6 Gender: Company or Organization: Ekoton	Re: ACTIVATED SLUDGE DEWATERING Reply #9 - May 30^th, 2012, 2:10pm From my not so long experience of operating of screw dehydrators I could see that it is possible to get more productivity by dry solids for one dewatering drum, that it was specified by the manufacturer. Maybe somebody else can share by the observations based on the experience?
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