Biological drying offers an efficient, cost-effective alternative to traditional sludge dryers through microbe-generated heat. Volume and weight reductions lead to lower transportation and disposal tonnages.
3. Sensors are placed in the admixture to
relay information to a microprocessor.
But instead of composting instructions, a
drying program will be using a different
set of processing parameters to control
temperatures and air flow.
When the only processing goals are
related to drying and not PFRP/VAR
attainment or compost manufacture,
drying can be faster and volume
reduction greater than with the
typical composting process.
Advantages of biological drying
• More cost-effective than other drying technologies
• Dries through “free” heat generated during
microbial feeding activity combined with aeration,
not applied heat
• Optional heat capture and/or electricity generation
Reduces transportation, disposal tonnage
Dried sludge is not the same as composted
sludge. Composting breaks down waste until it
isn’t waste anymore. Drying merely drives out
Compost, when wet, smells like damp soil. But
dried sludge may still generate unpleasant odors
Therefore, general use of dried sludge by/near
sensitive receptors is not recommended.