Overview

Since 1960, Stevenson & Palmer Engineering has served many municipal, county, private, and industrial clients. At Stevenson & Palmer Engineering, Inc. we are able to meet the needs of municipal, industrial, agricultural, and private clients with solutions for: wastewater, water, stormwater, transportation, site development, planning, surveying, solid waste, inspection, funding assistance and many other civil engineering services.

Our areas of service include Environmental, Transportation, Surveying/Mapping, Governmental Consulting, and Industrial.

Featured Project

The City of Hampton’s WPCP was over 30 years old and at capacity. Some existing City of Hampton WPCP plant components dated back to the 1950’s with the existing plant layout last upgraded in 1975, with the exception of an equalization basin and a new 1.75m belt press added in 2001. The City of Hampton engaged Stevenson & Palmer Engineering, Inc. for planning and design. Stevenson & Palmer determined the best alternative for expansion was to abandon the existing 0.5 MGD WPCP and construct a new facility and relocate the existing belt press. The new facility will expand treatment capacity to an average daily flow of 1.75 MGD. The new effluent limits for the increased flow capacity are very stringent.

Construction on the new facility began in May of 2008 by Choate Construction Inc, and is expected to be completed in January of 2010. The new 18 acre site adjacent to the existing plant sits on higher ground providing a better buffer to Bear Creek. A new Influent pump station will pump the flow to the new headworks allowing a gravity flow design through the entire plant. The headworks include a state of the art Muffin Monster automatic bar screen system and Smith and Loveless grit removal system. The flow continues to a Siemens Orbal reactor system in a 1.75 million gallon oxidation ditch that provides activated sludge biological treatment for BOD and nutrient removal. The system acts like a single sludge, continuous flow thru multi-reactor system allowing dissolved oxygen level adjustment thru each channel. Two 56 ft diameter Siemens Rim-Flo Tow-Bro clarifiers provide clarification prior to flow to an Aquionics Ultraviolet Disinfection system. Post aeration completes the treatment cycle before discharge to Bear Creek.

The sludge handling system begins with a RAS/WAS KSB pump station which will allow sludge to be returned to the system or wasted to two 48 ft diameter Digesters. The Digesters are equipped with coarse air diffusion with air provided by Aerzen blowers. The blowers are housed in a new building that also houses GPM Environmental PAC and Sodium Hydroxide chemical metering pumps and storage tanks. A new Maintenance building will also house the relocated Belt Filter Press and provide a workshop to maintain the plant and equipment.

The WPCP includes a new Control/Laboratory building that will use state of the art lab equipment and SCADA systems to monitor the plant. The construction cost is $10 million.

The City of Hampton is located in southwest Henry County, and is home to the Atlanta Motor Speedway. The population is about 5,120 except twice each year when it temporarily sees over 100,000 NASCAR fans.

For more information contact Adam Nelkie at 678-616-4570.

Previous Featured Project

Increasing sewerage demand in southeast Coweta County, served by the Shenandoah Shenandoah 1 WWTF service area, over the last few years initiated a need for additional sewage treatment capacity. The Coweta County Water & Sewerage Authority engaged Stevenson & Palmer Engineering, Inc. for planning and design. It became evident early in the planning phase that upgrading the existing facility would not be feasible. Some existing plant components dated back to 1972. Stevenson & Palmer determined the best alternative for expansion was to abandon the existing 0.9 MGD WWTF and construct a new facility adjacent thereto. The new facility will expand treatment capacity to an average daily flow capacity of 2.0 MGD. The new effluent limits for the increased flow capacity are very stringent.

The new treatment facility will be located adjacent the existing treatment facility. Shenandoah 2 However the available new construction site was limited. In fact, the existing drying beds were in conflict with part of the new facility’s layout. To resolve this conflict, a temporary dewatering building housing a 2-meter belt filter press was constructed while the 2.0 MGD WWTF was still under design. This solids handling method eliminated the need for the existing drying beds. The belt press will be integrated into the new facility in a permanent dewatering building.

Construction on the new facility began in April of 2007, and is expected to be completed in January of 2009. Advanced tertiary treatment was required. The activated sludge process utilizing the “Orbal” oxidation ditch process was selected. Key components of the new facility include: Influent pump station; Influent screening; Grit removal system; Orbal reactor with 1.9 million gallon volume; two 65 ft diameter clarifiers; tertiary cloth disk filters; ultraviolet disinfection; and post aeration. Sludge handling components include: RAS/WAS pump station; two 72 ft diameter digesters; and the relocated 2-meter belt filter press and sludge building. In addition, the existing polishing pond was converted to an off-line equalization holding pond and equipped with floating aerators. The WWTF also includes a new Control/Laboratory building and a Maintenance building. The construction cost is $13 million.

For more information, contact Stevenson & Palmer Engineer Bob Lane at 770-952-2481.