Wastewater

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.

For the 30-mgd Nansemond WWTP, we designed a plant expansion and upgrade that will meet an ammonia limit of 2 mg/L and a total nitrogen limit of 10 mg/L year-round.

Improvements to the Neuse River facility included a new equalization basin to handle wet weather flows, facilities for total nitrogen removal, a sludge management plan, and conversion of the existing chlorine contact tanks to ultraviolet disinfection contractors.

Using state-of-the-art simulations tools, like Biowin, we are able to test our designs using a wide range of variables - ensuring that your facility can meet its goals under even the most challenging conditions.

We are currently upgrading the South District WWTP to high-intensity ultraviolet light and hydrogen peroxide, an advanced oxidation process, creating the largest facility (285-mgd) in the State of Florida that treats to stringent reclaimed water standards.

For NYC's Applied Research Program, we evaluate potential future permit requirements and potential emerging technologies that could meet future effluent limits. Integrated Fixed-Film Activated Sludge (IFAS) has shown promise for other utilities that are required to meet extremely low levels of Nitrogen discharge.

A 5-stage biological phosphorus-nitrogen removal (BNR) process was determined to be the most cost-effective, involving lower capital and operations and maintenance costs for the North and South Durham Water Reclamation Facilities.

We use our 2Dc CFD Clarifier model to identify potential improvements to existing infrastructure and operating strategies, providing improved reliability in meeting stringent requirements and improved capital cost control through better use of existing facilities.

In anticipation of required nutrient reduction, Broward County undertook a pilot program to evaluate cost effective process modifications that would achieve the necessary reductions at the North Regional Wastewater Treatment Plant.

The UCONN reuse system utilizes an innovative process to treat wastewater effluent before delivering it for use as boiler feedwater and makeup for cooling towers and chillers.

To design the T.P. Smith Water Reclamation Facility, we used 3D CAD to accommodate both congested existing yard piping and the flight paths of the adjacent airport, accelerating approvals and permitting, and Biowin and CFD modeling to make sure stringent effluent limits were met quickly and cost-effectively.

The OWASA/UNC Chapel Hill reclaimed wastewater system is the culmination of five years of careful planning, comprehensive financial and technical feasibility studies, pilot scale testing, microbial risk assessment, detailed contract negotiations, final design, permitting and construction, and a thorough testing and acceptance strategy.

Rising costs are causing some utilities to consider low strength on-site hypochlorite generation (OSHG) systems as an alternative approach to providing equivalent chlorine. The low strength OSHG process is based on the electrolysis of brine, an electrochemical process that consumes salt (either solar or food grade salt), water, and power to produce a NaOCl solution.

For large utilities with high sodium hypochlorite demands and the capability of using excess caustic, high strength on-site hypochlorite generation (OSHG) systems have been seriously considered. The high strength OSHG process uses high purity salt to produce two primary products; wet chlorine gas and sodium hydroxide (caustic).

The Master Plan for the LeSourdesville WRF included plans for upgrade and expansion of its dry and wet weather capacities in three phases, along with measures to facilitate its compliance with anticipated future changes in regulatory limits.

Mobile pilot plants enable us to study advantageous process schemes on-site, using actual working inputs and conditions.

Our designs tackle foam, a problem in many BNR/ENR facilities, with multiple lines of defense, including surface wasting, RAS chlorination, polymer addition, and froth hoods.