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Date: September 17, 1999 - page 4 / 9

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These technologies were deemed most appropriate for the WWTP. A brief description of each unity process and its advantages and disadvantages are provided below.

Composting was also briefly evaluated; however, due to the limited availability of amendment material in the area, it was deemed to not be a viable option for the WWTP.

Quick Dry Filter Beds

this proprietary technology makes use of the existing sand drying bed area.

The existing media is removed and gravity deck of a belt filter press.

a “quick dry” The biosolids

media is installed. The process works similar to the are applied to the surface of the beds and the liquid

drains quickly leaving the solids 20%) can be achieved in as little little as one week. A specialized

to continue to dewater and dry. Removable solids (approximately as twenty-four hours; while 45% to 65% solids can be achieved in as biosolids removal machine is then used to skim the biosolids off the

media for disposal or stabilization. volume of conventional sand drying

This beds

unit operation can in the same area.

handle

more

than

three

times

the

biosolids

Advantages

  • Low capital costs

  • Low energy costs

  • Low operations and maintenance requirement

  • High solids concentrations

  • Low odor and noise potential

Disadvantages

  • Moderate land area requirements (if no filter beds currently exist)

Belt Filter Processes

This technology is currently being employed at the WWTP in lieu of

existing sand drying beds.

Multiple manufactures exist of this proven dewatering technology.

the A

gravity section exists first, where the bulk liquid is draned through a porous belt and rollers follows to

squeeze additional liquid out of the biosolids/water mixture. be expected from this technology, with proper operations.

Solids

concentrations

of

15%-20% can

Advantages

  • Simple to operate and maintain

  • Rapid removal and dewatering of biosolids

Disadvantages

  • Moderate capital costs

  • Moderate energy costs

  • Moderate chemical costs

  • Moderate operator attention

  • Moderate solids concentrations

  • Moderate noise and odor potential

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