Wastewater

As our planet’s population swells, so too does the waste stream, taxing infrastructure and demanding innovation in wastewater engineering and treatment processes. Hazen and Sawyer has long been at the forefront of this innovation, maintaining the industry’s top expertise in UV disinfection and advanced membrane processes, as well as traditional primary and secondary wastewater treatment.

We're assisting [[Henrico County]] to expand plant capacity from 45 mgd to 75 mgd in multiple design and construction stages, and designing an upgrade to increase the plant’s nutrient removal and ensure compliance with more stringent regulatory standards to come.

{link_text}

We have helped clients develop new, technologically-advanced wastewater treatment plants from less than one to more than 300 million gallons per day (mgd) capacity, each uniquely designed and built to meet specific desired outcomes. Just as often, we have assisted in the rehabilitation, upgrading, and expansion of existing plants. Our engineers are skilled in maximizing the use of existing structures and equipment and our careful project sequencing keeps plants in service during the phase-in of new facilities.

Through decades of experience assisting numerous treatment plants through various levels of upgrades, we have developed a state-of-the-art, site-specific approach to process modeling, design, and optimization using the BioWin™ simulator. Our extensive modeling library enables us to identify the most appropriate technology to meet any individual plant’s needs, accounting for process optimization, regulatory compliance, and energy efficiency.

Our approach also includes expert analysis and optimization of secondary clarifier performance using the 2Dc model – a state-of-the-art quasi-three-dimensional Computational Fluid Dynamics (CFD) model that can be used for circular or rectangular clarifiers. We also employ Life Cycle Analysis (LCA) and Total Cost Accounting (TCA) to assess both the internal costs (those borne by the utility) and external costs (those borne by society) of different design options, enabling decision-makers to consider each.

Hazen and Sawyer has also planned, designed and managed the construction of numerous sludge management facilities for both new and upgraded plants. These facilities range from lagoons to advanced highsolids sludge dewatering systems that yield the greatest possible disposal efficiency of plant residuals. Effluent, residuals and biosolids can often become an asset through any number of beneficial reuse options. From vast agricultural irrigation systems, energy generation facilities and aquifer recharge fed by treated wastewater, to fertilizer production from treated sludge, these reclamation and reuse projects can address both resource demands and market potential.

Wastewater @ Hazen and Sawyer

Paul Pitt, Ph.D., P.E.
Process Group Leader

Clients in need of top technical work need look no further than Hazen and Sawyer. We offer unparalleled expertise in process modeling, along with a particular talent for maximizing the use of existing facilities and maintaining the continuous operation of facilities during upgrades and/or expansion. No firm is better able to help you more cost-effectively achieve your goals.

Our commitment to success is equaled only by our commitment to research and advancing the field of wastewater engineering. You can trust us to solve your toughest challenges.