Composting Mixture

The new technology requires quicklime to be mixed with the dewatered sludge just prior to adding a bulking agent (sawdust, wood chips, bark, etc.) and recycled compost. Refer to Figure 7.13 for the schematic of the proposed

Sludge Composting Device

1.Hopper with conveyor for dewatered sludge

2.Silos for quicklime with processing unit and pneumatic pumping of lime

3.Hopper for bulking agents and recycled compost

4.Conveyor

5.Mixture device

6.Discharge conveyor for mixture to be composted

7.Loader

8.Composting piles

9.Air blowers

10. Air flowmeters

11. Cover over composting piles

1.Hopper with conveyor for dewatered sludge

2.Silos for quicklime with processing unit and pneumatic pumping of lime

3.Hopper for bulking agents and recycled compost

4.Conveyor

5.Mixture device

6.Discharge conveyor for mixture to be composted

7.Loader

8.Composting piles

9.Air blowers

10. Air flowmeters

11. Cover over composting piles

Figure 7.13 Schematic of raw sludge composting.

composting process. Once the quicklime and the dewatered sludge are thoroughly mixed, the bulking agent and a portion of recycled compost are added and mixed. This mixture is then formed into piles and allowed to compost until a temperature of 55 to 65°C has been maintained for 3 to 11 days. The piles are often covered with a layer of bulking agent or recycled compost to protect the pile from heat loss as well as to avoid attracting flies, mosquitoes, and other undesirable insects.

If odor becomes a problem during the composting process, the simple procedure of drawing air through the compost piles and discharging the air to a biofilter can help reduce the associated odor. Experiments indicate the following recommendations:

moisture content of thedewatered raw sludge: 80% or lower organic material in the composting mixture: 55% or higher quantity of quicklime added to dewatered raw sludge: 2.0 to 2.2% of sludge mass quantity of bulking agent added to dewatered raw sludge: 100 to 120% by volume quantity of recycled compost added to dewatered raw residual: 20% of sludge mass

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