4.9. SR 06-03-2013 - Laserfiche WebLink

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Proposed Project Team and Experience The final ash by-product is only 5%of the initial biosolids volume and significantly reduces hauling costs. Other improvements at the facility included a second fine screen,vortex grit removal system, 75-ft diameter secondary clarifier, a new ultraviolet disinfection system and pump maintenance shop. The system began start-up operations in the fall of 2008. The facility has been recognized by the American Council of Engineering Companies,Minnesota Society of Professional Engineers and the Environmental Business Journal for excellence in engineering. Blower/Aeration Improvements, New Ulm, MN (2011) Contact: Dan O'Connor,Wastewater Supervisor,507-359-8295 The City of New Ulm retained Bolton&Menk, Inc.to evaluate their blower and aeration system at the wastewater treatment facility.The existing blowers were 900 hp centrifugal blowers with a = capacity of 13,000 scfin.The City had three 900 hp blowers and through our evaluation it was determined that more efficient blowers could be installed and produce significant energy savings. The existing fine bubble diffusers only covered a portion of the aeration basin floors and while the existing diffusers did provide adequate air, there were dead zones in each of the four basins. It was determined that full floor coverage of the diffusers was the best option for the City and disc diffusers were installed in each of the four basins providing for full floor coverage. The City decided to replace one 900 hp blower with two, 300 hp turbo blowers with VFDs.Typically,only one of the turbo blowers needs to be operated. Additionally,with new dissolved oxygen probes,the blower will ramp up and down to meet oxygen demands. The one turbo blower operating produces the required air supply.The diffuser and blower upgrade has produced a substantial savings in energy costs of nearly$100,000 per year. Wastewater Regionalization, Annandale/Maple Lake/Howard Lake, MN (2009) Contact:Joe Haller,Annandale Public Works Director,320-274-3055 The cities of Annandale, Maple Lake and Howard Lake, Minnesota,partnered to create a Wastewater Treatment Commission with one centralized facility. Bolton&Menk completed a wastewater facility plan,design,project funding assistance, and construction services for this project. The major wastewater treatment improvements included: construction of new lift stations; forcemains;grit and screening removal facilities; aeration basins;final clarifiers; chlorination/ dechlorination basins; aerobic biosolids treatment and storage;blower and control building; and outfall piping. The project required the design and construction of new main lift stations and associated force mains for each community.An effluent lift station and force main was also needed to convey the effluent from the treatment facility to the receiving river. The peak design flows for these lift stations varies from 1,250 gallons per minute to 4,000 gallon per minute. Each community has unique flow variations and varying potential for growth. These variations were considered to identify the most efficient and economic lift station and force main designs. Wastewater Treatment Facility Improvements I City of Elk River, Minnesota 7