Wastewater Process Optimization

Hazen and Sawyer has extensive experience in the design, construction, startup and optimization of wastewater process improvements, with particular emphasis on designs to minimize operating cost and capital expenditures. We provide best-value solutions that will save you money.

We optimized the 75 mgd Henrico WRF to meet TN < 5 mg/L and save $300,000/yr through aeration improvements and supplemental carbon optimization.

For the 310 mgd Newtown Creek WWTP in NY, we achieved secondary treatment certification two years ahead of schedule and eliminated primary settling tanks resulting in $1.1 billion in capital savings.

The Neuse River WWTP in North Carolina was rerated from 60 mgd to 75 mgd, resulting in $10 million in capital savings of additional infrastructure. Conversion from mechanical aerators to fine bubble diffusers resulted in 20% annual savings in energy costs.

The 60 mgd F. Wayne Hill WRC maintained its rating due to whole plant model calibration and optimization, saving $300,000 per year.

At the 370 mgd Blue Plains WWTP in DC, we designed conversion to fine bubble diffusers in deep tanks for estimated power savings of over $2 million per year and replacement of sparged turbine mixers with Invent mixers for an estimated power savings of $1.4 million per year.

The 26.5 mgd T.P. Smith Water Reclamation Facility in Tallahassee (FL) realized $2 million in capital cost savings from clarifier CFD optimization.

For the Orange Water and Sewer Authority (NC) WWTP, we developed a calibrated BioWin model and converted the existing denitrification process to step feed at zero cost, saving $225,000/yr.

At the 15 mgd Moores Creek WWTP, we developed a process optimization plan and installed turbo blowers and combined heat and power resulting in $1 million present worth savings.

With our guidance, the New York City DEP instituted an Advanced Wastewater Treatment Program that resulted in a 58.5% reduction in nitrogen over 15 years and $1 billion in capital savings over potential alternatives.

We expanded the Falkenburg WWTP in Florida from 9 mgd to 12 mgd with no new aeration basins, saving over $4 million in capital costs.

Our BNR upgrade for the 25 mgd Arlington East facility saved the utility over $10 million in nutrient removal capital costs and won the 2011 FICE Engineering Excellence Award.

Our full scale pilot at the 95 mgd Broward County Regional WWTP demonstrated nitrogen removal to TN < 12 mg/L without physical modifications, resulting in capital cost savings.

Decades of designing new plants, upgrades to meet lower nutrient limits, plant expansions, facility re-ratings, process optimizations, and independent research have all shaped our approach to process modeling, design, and optimization. Our whole-plant approach recognizes the interconnectivity of all the elements of the wastewater treatment process, focusing on the most cost-effective and reliable means to achieve desired levels of treatment. We have worked with clients of all sizes and in all locations to construct projects that are on schedule, within budget, and are currently exceeding the required effluent nutrient standards.

We develop true whole-plant process models using industry standards such as BioWin or GPS-X® in combination with proprietary tools such as our 2Dc Computational Fluid Dynamics clarifier model and our Hazen Energy Efficiency Tool (HEET). Together, these tools provide the most complete understanding available of process alternatives and identify process optimizations that will bring the greatest return on investment.

We offer our clients both world-renown process modeling and unsurpassed technical knowledge, taking an operator’s perspective in developing process alternatives founded in realistic operability and sustainable maintenance.

Whether your average daily flow is less than 1 mgd or 300 mgd, whether you need to upgrade to secondary treatment or achieve nutrient removal at the limits of technology, you can trust Hazen and Sawyer to help solve your toughest water environment challenges.

For inquiries contact:
Paul Pitt, Ph.D., P.E., at ppitt@hazenandsawyer.com