Solids Reduction Test Resuts

   Wastewater Sludge Pond No 4
   Australia - March 21, 1992

   Objective: To significantly Reduce Sludge Solids

Treatment was initiated on December 30, 1991 and concluded on January 1, 1992. Historical sludge accumulation/depth records      indicated that the depth of sludge at the start of the study was between 580 and 620mm. No sludges were discharged to pond 4      subsequent to October 24, 1991.

Results: The plant reported that all of the normal unpleasant odour associated with the pond water was eliminated within 4-5 days of dosing commencement. Between December 30, 1991 - February 26, 1992 the following results were also achieved.
   SLUDGE SOLIDS    53.4%
   BOD Unfiltered Supernate       73%
   BOD Filtered Supernate   79%
   SS Supernate     63%
   COD Supernate         56%
   NH3 Supernate   52%
   Sludge Depth      33%
   Chromium (Sludge)           25%
   Zinc                                     13%
   Copper                               12%
   Lead                                   12%
   Cadmium                            20%
   Nickel                                  32%
   Chlorophyl A Supernate    74%
   Pheophytin A supernate    75%
   E Coli Supernate                99%

   February 2001 - June 2001
   Data gathered by plant personnel

Treatment was initiated on February 6, 2001. The plant was chosen based on the quality of operation that currently existed at the plant. The plant is a well-run, efficient plant. The goal of the Test was to increase methane production while decreasing solids. The following results were identified at the conclusion of the study.

  • Dry sludge was reduced by an additional 20%
  • By June 2001, cubic feet of gas produced had been increased 19.5% over the previous year even though a 15% reduction was identified in the amount of solids coming into the plant

   South Carolina
   February 27, 1991
   Evaluation By: Deputy Director

   Treatment was initiated August 1990. The condition of the facility is described in the attached pages.

   The following results were identified after a three-month test period:

  • Reduced oil and grease through the entire waste system
  • TSS were reduced by up to 50%
  • BOD was reduced by up to 50%
  • Maintenance reduced for oil and grease control
  • Collection stations and transfer lines cleaned of oil and grease
  • Control of the waste treatment facility became more manageable
  • Manpower optimized
  • Infrastructure protected from physical and chemical damage
  • The cost of product was offset by the reduction in over all maintenance and chemical cost
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