When residents depend on you to provide essential services at the lowest costs possible, municipal officials can feel like they’re between a rock and a hard place. The city of Tyler, Texas, solves this dilemma by applying Lean Six Sigma to everything from garbage collection to its hiring process.
The city has completed 103 projects in the past six years, projects that have enhanced the quality of life for its residents while yielding some $5.4 million in savings.
For example, officials noticed the Westside Wastewater Treatment Plant used varying amounts of magnesium hydroxide, which prompted an investigation by employees trained in Lean Six Sigma. Magnesium hydroxide stabilizes pH levels, controls the odor of raw wastewater, reduces sludge, and settles solids.
The team set out to identify the optimum magnesium hydroxide level that would meet all of the necessary functions and comply with the Texas Commission of Environmental Quality’s pH level requirements.
The Westside Wastewater Treatment Plant handles about 60 percent of the city’s wastewater, processing an average of 7.5-8 million gallons per day. Standardizing the amount of magnesium hydroxide added to the wastewater would reduce costs. The project team first needed to determine what caused the fluctuations, and see how the varying amounts of the chemical affected the treated wastewater.
City of Tyler, Texas
- Population of approximately 107,405
- Regional educational and technology center
- Called the “Rose Capital of the World” due to its role in the rose-growing industry and hosting America’s largest municipal rose garden
Provide excellent public services while keeping municipal costs as low as possible.
Minitab® Statistical Software
- Used Lean Six Sigma to complete 103 projects for the city
- Total savings over $5.4 million
- For example, optimized magnesium hydroxide process at wastewater treatment plant has saved more than $79,000 so far