Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
Lake Mead was formed with the construction of the Hoover Dam during the great depression. Filling of the lake was completed in 1939. The overall natural drainage in the Las Vegas Valley runs from the higher lands in the west side of the valley to the low points along the east side where the Las Vegas Wash conveys runoff and drainage water from the valley toward a branch of the lake known as...
PublisherWater Environment Federation
Word count877
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
From the first 3.8-ML/d (1.0-mgd) Imhoff tank built in 1931 by the City of Las Vegas to a recent ultrafiltration facility started up in 2013 at the Flamingo Water Resource Center (FWRC), several different upgrades in treatment processes and operational strategies have occurred in all WRRFs within the valley. Although each WRRF evolved differently, all dischargers have faced similar challenges.
PublisherWater Environment Federation
Word count416
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
As the dischargers transitioned to biological phosphorus removal, operators quickly learned that a tradeoff to monetary savings was occasional process instability. The dischargers took different approaches to optimize their facilities, but collaboration to share lessons was key for the development and fine-tuning of each process. Through the years, operators and engineers have developed and...
PublisherWater Environment Federation
Word count99
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
Operated by the CCWRD, the optimization process at the FWRC involved several steps including primary treatment, secondary treatment, tertiary treatment, and recycle flow management. Perhaps the most significant optimization measure was the operation of primary clarifiers with high sludge blankets (in-basin thickening) to promote fermentation and production of VFAs. The in-basin sludge thickening...
PublisherWater Environment Federation
Word count402
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
Optimization of the City of Las Vegas Water Pollution Control Facility was coupled with overall infrastructure rehabilitation, replacement, and retrofit. The city upgraded this facility from a trickling filter system with no capabilities for nutrient removal to a trickling filter followed by activated sludge for nitrification in the 1990s. Until 2011, the facility treated flows from both Las Vegas...
PublisherWater Environment Federation
Word count259
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
At this facility in Henderson, process optimization was coupled with retrofits and upgrades. The facility was operated as a zero-discharge facility through the 1980s. Due to increasing influent flows and limited infiltration capacity, a new treatment system was implemented in 1994 with conventional activated sludge (but without primary treatment) followed by tertiary filtration with alum addition.
PublisherWater Environment Federation
Word count250
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
The City of North Las Vegas operates the newest facility in the valley. This facility was commissioned in 2011 and is designed to treat an average daily flow of 95 ML/d (25 mgd), but currently operates at 65 ML/d (17 mgd). The facility is an advanced tertiary level facility with a membrane bioreactor (MBR) in its BNR process. This process combines secondary and tertiary treatment into one,...
PublisherWater Environment Federation
Word count389
Description: The house always wins with water quality: Las Vegas pushes phosphorus removal to it...
Lake Mead has a complex ecosystem with varying dynamics. This makes it difficult to quantify and correlate outcomes from nutrient load reductions over the years. However, since the dischargers began voluntary year-round compliance and process optimization, the average chlorophyll-a concentrations measured in the Las Vegas Bay have been consistently below 5 µg/L and there have been no...
PublisherWater Environment Federation
Word count212
The house always wins with water quality: Las Vegas pushes phosphorus removal to it limits