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This chapter deals with processes for biosolids dewatering and septage treatment. Septage is the liquid and solid material pumped from a septic tank or cesspool when it is cleaned. A selection of recent methods that show promising applications is presented. These include: Expressor Press, Som-A-System, CentriPress, screw press, Sun Sludge system, wedgewater bed, vacuum assisted bed, reed bed, biosolids freezing bed, biological flotation, and septage treatment and management systems. When septage is to be ultimately treated at a wastewater treatment plant or independent septage treatment facility, a receiving station is required in order to provide preliminary treatment and equalization. The septage treatment and management options discussed include septage addition to biological wastewater treatment plants, septage land application, septage lagoon disposal, septage composting, and odor control. |
