Patents Assigned to PCL Environmental Inc.
  • Patent number: 5428906
    Abstract: A method of converting industrial, domestic or other sludge, into a pelletized or granular fertilizer, as well as a sludge converter for practicing the method. The sludge is dewatered to form sludge cake solids which are dried in a dryer, and then sorted with a sorter into a sorted product comprising oversized, undersized, and standard sized product. A portion of the sorted product is recycled for mixing and sizing in a mixer with the dewatered sludge cake solids. To control dust and odors, cyclones and a condenser remove a substantial portion of the gaseous particulate matter and condensable gases from the converter, and any remaining noncondensates are burned in the heat source flame. A waste oil burning heat source supplies heat energy to the dryer.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: July 4, 1995
    Assignees: PCL Environmental, Inc., Sludge Management, Inc.
    Inventors: Bart T. Lynam, Gerald F. Nelson, David H. Meese, Ronald V. Peterson, Michael G. Ruby, Alan White
  • Patent number: 5279637
    Abstract: A method of converting industrial, domestic or other sludge, into a pelletized or granular fertilizer, as well as a sludge converter for practicing the method. The sludge is dewatered to form sludge cake solids which are dried in a dryer, and then sorted with a sorter into a sorted product comprising oversized, undersized, and standard sized product. A portion of the sorted product is recycled for mixing and sizing in a mixer with the dewatered sludge cake solids. To control dust and odors, cyclones and a condenser remove a substantial portion of the gaseous particulate matter and condensable gases from the converter, and any remaining noncondensates are burned in the heat source flame. A waste oil burning heat source supplies heat energy to the dryer.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: January 18, 1994
    Assignees: PCL Environmental Inc., Sludge Management, Inc., Riedel Waste Systems, Inc.
    Inventors: Bart T. Lynam, Gerald F. Nelson, David H. Meese, Ronald V. Peterson, Michael G. Ruby, Alan White