Energy consumption for sludge dewatering

Published on by in Technology

Hello,  

I am looking ​into some ​specific values ​for typical ​sludge ​dewatering ​pathways for ​municipal ​sludge. ​

Ideally, I ​would like to ​retrieve energy ​consumption ​rates for dewatering ​techniques (​mostly ​centrifuge and ​belt presses). ​Something like ​typical kWh ​required per ​ton of sludge ​treated. ​

Does anyone ​have a ​literature ​reference for ​this? Or maybe ​commercial ​flyers for some ​of the most ​common pieces ​of equipment? ​

Any hint is ​greatly ​appreciated ​

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4 Answers

  1. superior quality of wastewater sludge dehydrator: ELODE, the world's first field-proven commercialized electro-osmosis dehydrator which treats all types of wastewater including municipal sewage, paper-mill wastewater, food wastewater, livestock wastewater, wastewater from dyeing, wastewater from painting, chemical wastewater, pit wastewater, etc. ELODE extracts both free and absorbed water from the sludge producing a final dehydrated product with a moisture content of less than 30~60% (i.e. greater than 40%~70% dry solids content) at 0.25kW/liter electric consumption only(Dryer=0.9~1.2kW/liter). This ensures maximum dehydration performance with minimum environmental impact. ELODE can be installed as a complete system or in addition to an existing sludge treatment system. for more information visiti : www.bluewin.kr

  2.  

    Dear Marco,

    One can test the dewatering capability of sludge by using a Mareco minipress. The test results gives an figure about proper dosing of chemicals, and also give a better founded decission about the right polymer and the dosing of the polymer. Better dewatering capabilites results in lower sludge volume, resulting in lower energy consumprion. So - not an answer about power consumption, but hopefully an idea for energy and chemical reduction.

  3. "Sludge dewatering is often performed applying continuous centrifugation. With a centrifuge, a final dry solids content of about 25% can be achieved. For sludge stabilization a poly‐ electrolyte consumption of about 10 kg per ton SS is required, whereas the energy consumption is about 100 kWh/ton SS. Centrifugation requires relatively high personnel attention" reference: https://courses.edx.org/c4x/DelftX/CTB3365STx/asset/W6c_SlidesTekst.pdf

     

    Also see: EPA Electrical Power Consumption for Municipal Wastewater Treatment  https://nepis.epa.gov/Exe/ZyNET.exe/9100TG7H.TXT?ZyActionD=ZyDocument&Client=EPA&Index=Prior+to+1976&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C70thru75%5CTxt%5C00000014%5C9100TG7H.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL 

    2 Comments

    2. Thanks! That's exactly the kind of information I was looking for. I eventually decided to take some values from commercial flyers displaying different dewatering units. Then I've interpolated the data, looking for a certain correlation between treated flux and energy consumption

  4. dear Marco, 

    regarding to your inquiry i think that you need to try and utilize a multi screw press plate machine this machine decrease a power consumption and thickner chemical