I have seen tremendous ...

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I have seen tremendous success at dewatering by the use of Colloidal Silica in the Paper production  Industry.    It is quite inexpensive and works very well.  

Further, depending on the HRT of the WWTP process, utilizing Microbes to reduce the amount of Sludge is very successful.  The successful process utilizes aerobic microbes witch converts all organics to Carbon Dioxide and Water.  The only resultant sludge is inorganics which are a minor part of the original sludge.  Obviously,  this works even better in WWTP processes which are utilizing lagoons. The process can even increase the capacity abilibty greatly.  This can be used instead of the very expensive upgrading of the facility to increase the plant's capacity

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Why stop at microbes?  We have developed a system that uses worms (tiger worms or Eisenia fetida) to treat sludge produced by conventional biological treatment.   Liquid sludge is fed into the plant and the worms within it (~10,000/m2) feast on the solids.  The resulting effluent has a loading characteristic similar to domestic sewage, which makes it to very easy to treat.  In short a system which significantly reduces sludge treatment costs, removing the need for complex dewatering systems, tankers and the high on-costs for disposal. PM me for more details.

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