Desulfurization Plant Modifications - The existing H2S Removal Facility was investigated to identify operational problems. A testing program was conducted and modifications recommended. In addition, various alternate H2S removal processes were investigated and pilot tested as substitutes for the existing vanadium based Stretford process. The modifications to the existing Desulfurizaion Plant consisted of piping and equipment modifications to alleviate operational problems as well as provide for the conversion of process technology from Stretford to Lo Catiron-based technology. This conversion utilized existing equipment to the maximum extent possible. Additionally, this project maximizes the plants operational mode, by increasing the treatment capacity of the plant to 12 million Standard Cubic Feet per Day (SCFD). This also increases the sulfur removal efficiency, bringing it into compliance with AQMD Rule 431.1. Another benefit was realized by providing redundancy to those items which required plant shutdowns for maintenance, as well as, upgrading the emission control system to a state-of-the-art biofilter system.
Desulfurization Plant Expansion - Based on criteria developed tested and noted above, the desulfurization capacity was expanded to handle the treatment of projected increases in digester gas. The expansion of the existing H2S Removal System provides an additional train capable of processing 20 million Standard Cubic Feet per Day (SCFD) of digester gas. Concept/Predesign Reports were prepared and detailed design, construction management and start-up support was provided for the recommended modifications. Dean Ryan tested the completed facilities for compliance with the conditions of the AQMD permit.
Gas Flare Expansion - As gas quantities increase, additional gas flares are required to accommodate gas handling during emergency conditions, The emphasis is on low noise levels and smokeless burner design. The expanded facility provides adequate spare capacity to accommodate the forecast digester production rate for the year 2010. Total Project Cost: $22,993,000. Schedule Completion Date: June 1999.