Dear Kesav

Gud luck......................

Can u be more specific on your quiries that will enflighten us to perceive it properly.

rahul

Gross heat value of dry sewage sludge usually lies in the range 8-12 GJ/ton (for a residual moisture of about 10%). It is commonly used in Europe. Due to low heat value, replacement of fossil fuel is limited in main burner.

You also have to take analysis into account. Depending on the origin of the sludge, alkalis, chlorine, sulphur, phosphorus and/or some heavy metals (mercury) may be high enough to become an issue, especially at high level of use.

As for municipal solid waste, the light fraction (sometimes called "fluff") is also commonly used. It is obtained by separation in air-swept drums after coarse shredding. The plastics and papers are carried away by the air stream. They need to be shredded again before use in cement kiln. It is difficult (but not impossible) to get these shredded fine enough for the main burner, so it is preferably used in long residence time calciners. Gross heat value is strongly dependent on moisture content. Chlorine content is a common issue.

 Best regards.

Dear Mr.Ovancantfort,

Thanks for your detailed mail.I infer that you have osme experience in Municipal solid waste processing.Could i have some detailed discussions with you ,if you wish ?

Waiting for your reply.

My id is chemicalenggkesavaraj@yahoomail.com

If you are flexible enough we can chat and have some discussions.

Thanks and Regards,

Kesavaraj

Dear Mr Kesavaraj,

My experience is in fact limited :)  I only visited some waste processing plants producing the fluff we use in our plants. I am not directly involved in this waste preparation. These plants may vary a little but are alway using same principles: shredding, air separation, metal separation,...

 If you do some research on "waste processing" and "RDF" (Refuse Derived Fuel, which is a little bit broader term than "fluff", you should easily find some examples and flow-sheets of such waste processing plants.

 Best regards