![]() Utilization of the internal discharge system reduces the potential for the plugging of discharge lines, further reduces the potential for odour emission, maintains the gas tight features of the system and reduces capital cost. The internal discharge system is a more cost-effective and reliable method of removing solids from the digester than the external chamber used in early German designs. The jet pump system provides draft tube mixing with no moving internal parts. The Pinellas system, depicted on the screen, includes a jet pump mixing system with an internal discharge system that was developed by CB&I, an engineering, procurement and construction company. Output screens are transmitted to other operator stations in the facility, which allows a more effective interface between personnel and reduces operator time to monitor the digester operation. Information from the ESD facility control system is communicated throughout the plant. The Pinellas County facility incorporates many recent improvements in ESD technology. The ESD jet pump mixing system replaces the typical mechanical draft tube mixer, providing a more economical approach to the overall design of the facility. The overall facility design includes two ESD vessels with the jet pump mixing system, a combination digested sludge gas storage tank and automated system control. Startup and training was completed in the summer of 2002 and turned over to Pinellas County. Pinellas County negotiated a lump sum, turnkey contract for a 600 m3 ESD facility in the fall of 2000 to meet the start-up schedule.ĭesign and construction of the facility took place within a 15-month period. Anaerobic digestion was added to the pelletizing facility to reduce solids, improve product quality and produce gas that could be used in the pelletizing process. The County wanted to build a facility to treat solids that would produce a Class A product in a pelletized form, which could then be marketed and sold. This approach was recently implemented at a facility located in Pinellas County, Florida, USA. A few of the benefits of this construction approach include single source responsibility, accelerated construction schedule and lower capital cost. Recent enhancements incorporated into the original design of the Egg-Shaped Digester (ESD™) anaerobic digester system have led to simplified mechanical systems, which have further improved the life cycle benefits of ESD systems.Ĭonsequently, these improvements have allowed many owners to consider design-build construction of a digester facility.
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