Item 3: Ratification of 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. Status: Planning stage with the exception of landscaping (in keeping with the 2004 Facilities Plan landscaping budget allocations, funding from this project is being made available in FY 11-12 to accommodate staging of the plant-wide integrated landscape plan). 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 under the 2010 Facilities Plan Update. Improvement SDC Eligibility: 54% Estimated Project Cost : $8,600,000 Expected Cash Flow: FY 10-11 = $269,700; FY 11-12 = $286,200; FY 12-13 = $3,806,000; FY 13-14 = 4,238,100 Prior2010-11 Expenditure/Category:YearsEst. Act.2011-122012-132013-142014-152015-16Total Design/Construction $0$269,700 $300,000 $8,030,300 $0$0$0$8,600,000 Other $0$0$0$8,030,300 $0$0$0$0 Total Cost $0$269,700 $300,000 $8,030,300 $0$0$0$8,600,000 Page 62 DRAFT FY 11-12 BUDGET AND CIP