Municipal Wastewater Treatment Plants

General Treatment Process:

SEDIMENTATION & CENTRIFUGATION NEWSLETTER August 2001 No. 260 Denver Will Treat Secondary Effluent and Send it to Public Service of Colorado for Cooling Water Treated effluent from the Metro Wastewater Reclamation District is expected to help relieve a water supply shortfall for Denver Water’s customers. Denver Water will take secondary treated effluent from the Metro District, further treat it at another facility, and distribute it for use where non-potable supplies are appropriate. The project would be built in three phases. In Phase 1, the reuse water would be used in the area near the Metro District’s treatment facility at 64th and York Streets. Public Service Co.’s Cherokee power station and nearby refineries will be among the first customers, according to a briefing by Denver Water. http://www.metrowastewater.com/new/effluent.html

SEDIMENTATION & CENTRIFUGATION NEWSLETTER - April 2002, No. 268 Denver Metro Using New Polymer System with Their Centrifuges Denver Metro decided to replace the old polymer feed system with a new one called the Semblex system, manufactured by Severn Trent Services (Fort Washington, PA). The new polymer system is completely automated, using a programmable logic controller (PLC) that helps operators control the entire system. But the programming of this system is no small chore. Even after 2 years of operation, certain PLC functions still are being adjusted to optimize the system. From a central control panel, operators can monitor a display that shows them how a process is progressing and alerts them to any problems. The new system consists of two large-capacity dry-polymer feeders each capable of handling up to 4800 lb/d (2200 kg/d) of dry polymer. Current usage is at the rate of 2400 lb/d (1089 kg/d). The system is now operating at slightly more than 50 percent of capacity, and the reliability of system operation has reduced maintenance costs, says Steve Walker, assistant operations superintendent at Metro Wastewater Reclamation District (Denver, CO) in a WE&T article (see abstracts for more information).

SEDIMENTATION/CENTRIFUGATION NEWSLETTER - February 2002, No. 266 Denver S.W. (Parker Co.) Awarded for Performance in the "Small Advanced" Category This 1-mgd (3800-m3/d) plant includes a Bardenpho advanced secondary treatment process — a staged, activated sludge process that uses the wastewater's BOD to remove nitrogen without chemicals and promote biological phosphorus removal. The process consists of five basins: fermentation, first anoxic, oxidation- nitrification, second anoxic, and re-aeration. This process helps the plant consistently meet one of the most stringent phosphorus limits in the country (0.07 mg/l).