Methods for treatment of wastewater with powdered natural lignocellulosic material
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United States of America Patent
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Jan 27, 2009
Grant Date -
Jul 26, 2007
app pub date -
Jan 20, 2006
filing date -
Jan 20, 2006
priority date (Note) -
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Abstract
A process for treating wastewater through the use of powdered natural ligno-cellulosic materials (PNLM) for (a) physically removing colloidal and suspended volatile solids through adsorption and enhanced floc-formation and settling during pretreatment; (b) adsorbing toxic substances and elements that interfere with biological processes, thus serving to reduce their contact with and exposure to activated sludge organisms effecting wastewater treatment functions; (c) providing fixed surfaces in activated sludge wastewater treatment bioreactors for bacteria and other organisms favoring attached growth in circumstances devoid of such surfaces; (d) reducing production of biological sludge, while also helping to maintain high treatment efficiencies; and (e) following aeration, enhancing the settling characteristics of sludge with respect both to speed of settling and the vertical profile of the settled sludge.
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