condensed tannins.   Polysaccharides Polysaccharides are polymeric carbohydrate structures, formed of repeating units (either mono- or di-saccharides) joined together by glycosidic bonds.     Sludge Sludge is the residual, semi-solid material left from industrial or wastewater treatment processes.     Page 2 of 2 Start Prev 1 2 Next End Home