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
unit operation can in the same area.
Low capital costs
Low energy costs
Low operations and maintenance requirement
High solids concentrations
Low odor and noise potential
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.
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.
Simple to operate and maintain
Rapid removal and dewatering of biosolids
Moderate capital costs
Moderate energy costs
Moderate chemical costs
Moderate operator attention
Moderate solids concentrations
Moderate noise and odor potential