Item 3: Ratification of FY11 MWMC Budget

Home Browse Search

Metropolitan Wastewater Management Commission Capital Improvement Program INCREASE DIGESTION CAPACITY Description: Installation of a fourth conventional high rate digester for continued production and expanded production of Class B biosolids. Justification: Continue to meet the requirements for Class B digestion with the ability to take one digester out of service for cleaning. Project Driver: This project addresses the need for more anaerobic digestion capacity. In the 2004 MWMC Facilities Plan, an option was identified to also change the existing digestion method in order to produce Class A biosolids. This option was to be considered as a strategy to secure a wider range of beneficial end-use options in the case that that flexibility was needed for beneficial reuse. Since that time, MWMC has taken effective steps to expand the ability to handle Class B biosolids through the construction and expansion of the Biocycle Poplar Plantation, and through working with other end users. Also, studies have shown that the current solids handling system will actually produce a Class A product because of the extended storage time available for biosolids in the lagoons at the biosolids handling facility. The digestion capacity issue will be influenced by several operational factors including the effectiveness of new primary sludge thickening and expanded WAS thickening processes, as well as digester cleaning protocols and schedules. Observation over the next several years is required prior to making a decision on when the expanded digestion facilities will be needed. A restudy of the anaerobic digestion system function and capacity should be undertaken prior to moving forward with this digestion expansion project. This study can be conducted as part of the Facilities Plan Engineering Services contract with CH2M HILL. Project Trigger: The trigger for design and construction of new digestion facilities will depend on the findings of the digestion system capacity and process alternatives study, which will be started in FY 2011 under the continuing Facilities Plan Engineering Services contract. Improvement SDC Eligibility: 54% Estimated Project Cost : $8,600,000 Expected Cash Flow: FY 10-11 = $249,000; FY 11-12 = $251,000; FY 12-13 = $3,782,000 FY 13-14 = $4,318,000 Prior2009-10 Expenditure/Category:YearsEst. Act.2010-112011-122012-132013-142014-15Total Design/Construction $0$0$500,000 $0$8,100,000 $0$0$8,600,000 Other $0$0$0$0$0$0$0$0 Total Cost $0$0$500,000 $0$8,100,000 $0$0$8,600,000 Page 65 DRAFT FY 10-11 BUDGET AND CIP