Students: Andrea Moreno, Tony Heng Liang, Kevin Manasan
Faculty Advisor or Community Project Lead: Osama A. Abaza
Client Organization: Anchorage Water and Wastewater Utility
CWolf Engineering 2017 was contracted to deliver a 35% design to upgrade the King Street hauled waste disposal station for Anchorage Water and Wastewater Utility (AWWU). This station was upgraded in 2010 but is in need of another upgrade considering the increase in operation and maintenance (O&M) costs. Unauthorized materials, which include screenings, sediments, and fats, oils, and grease (FOG), are the main cause of the issues, which include sanitary sewer overflows (SSO) and the hindering of existing monitoring equipment. ADEC worked closely with the Environmental Protection Agency (EPA) to manage reduction of SSOs.
Objectives requested by the client included:
- Research, review and analyze data compiled by AWWU and other agencies.
- Equipment selection to properly handle the intake of FOGs, screenings, and sediments.
- Building equipment must support the projected septage flow and population increase for the Municipality of Anchorage (MOA) for 2037.
- Design an upgrade for the King Street hauled waste disposal station with a 20-year outlook.
- Provide a design study report and 35% design of preferred recommended solution.
- Prepare cost estimates for recommended alternatives.
CWolf Engineering 2017 designed a recommendation for the upgrade of the King Street hauled wastewater disposal station with a 20-year outlook. This upgrade will be able to support the projected flow and population increase for the Municipality of Anchorage (MOA) for 2037. With the upgrade, the station will properly handle the intake of FOGs, screenings, and sediments.
The selected equipment for the upgrade is the Raptor Septage Complete Plant (Model 40SCP) manufactured by Lakeside. This prefabricated septage receiving station includes grit and screening removal equipment that dumps the waste into dumpsters for Alaska Waste to pick up weekly basis. The equipment will also clean and dewater the waste prior to dumping. A barrel of lime will also be included with the final design. A layer of lime on top of the waste will help with dewatering and odor control. The hot water injection point for the influent end of the septage receiving station is located before the magnetic flow meter. This will degrease and remove particles to ensure accurate flow meter readings, as well as increasing the lifespan of the equipment.
The King Street location does not currently have a supply of water to the building. It is necessary for the process in removing screenings, grit and providing water to wash down any spills. The receiving station will receive its water supply by tapping into the nearby existing water main. The available flow of the water main is 250 GPM at 58 PSI. Approximately 200 feet of 12” diameter pipe would be required. During the construction of the new King Street septage receiving station the Turpin Street location.
An anticipated total of 1.4 cubic yards of screenings removal and 1.7 cubic yards of grit removal by the Raptor Septage Complete Plant. Roughly, 0 cubic yards of screenings should pass into the sewer interceptor but 2.6 cubic yards of grit should. The FOG received on-site will need treatment at the AWWTF. Alaska Waste will pick up the collection of screenings and grit from the 6 cubic yard dumpster bins once a week located on the west-facing wall of the station. The estimated construction upgrade cost of the King Street septage receiving station is $12.25 million.
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