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Albany Augusta Atlanta
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OverviewSince 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. The City of Leesburg’s WWTF, which consisted of only a facultative pond, was originally constructed in the 1960’s. Upgrades to the facility, including the installation of aerators, baffle curtains, and increased capacity, were completed in 1991 by Stevenson & Palmer Engineering, Inc. From 1990 to 2005 the City saw a population growth of 91%, which is more than 3 times the state growth for that same period of time. With this population increase came a greater demand for sewage treatment capacity. EPD was also imposing very stringent effluent limits on the City’s discharge. The City of Leesburg sought out Stevenson & Palmer Engineering for the planning and design of a new, state of the art 1.2 MGD wastewater treatment facility. It was determined that property would be acquired adjacent to the existing oxidation pond for the construction of the new plant. In August 2009, construction of the facility was begun by Ruby-Collins, Inc., and construction is expected to be completed by March 2011. The selected process for the new facility was an activated sludge process utilizing the Eimco Water Technologies’ “Carrousel” oxidation ditch. Two influent pump stations, located in the City, pump all the wastewater flow from the city to the headworks, which includes a Cleanflo spiral screen and a manual bar screen bypass. The influent then gravity flows to the 1 million gallon “carrousel” oxidation ditch where two 75 horsepower aerators provide oxygen for BOD and nutrient removal. After the oxidation ditch, two 50’ diameter clarifiers provide clarification prior to disinfection by the Wedeco ultraviolet disinfection system. Dissolved oxygen is added to the effluent using a concrete cascade aeration structure before being discharged into the Kinchafoonee Creek.
In addition, the existing oxidation pond was converted to an off-line equalization basin. Space was incorporated into the design for a future grit removal system and tertiary filters. The WWTF also includes a new control/laboratory building that houses an advanced SCADA system, which assists in process control and monitoring of the new plant. The construction cost for this project was $5.2 million. For more information, contact Stevenson & Palmer Engineer Jeremy Brown at 229-883-0332. Previous Featured Project The City of Hampton’s WPCP was over 30 years old and at capacity. Some existing 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 Stevenson & Palmer Engineer Bob Lane at 770-952-2481.
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Sludge removed from the clarifiers is either returned to the system or wasted to the 56 ft diameter Aerobic Digester using the three 900 GPM RAS/WAS pumps. Aeration is by positive displacement blowers through coarse bubble diffusion. Digested and concentrated sludge is then dewatered using a Bright Technologies 1.2 meter belt filter press. The dewatered sludge is disposed at a landfill. The new facility is also equipped with a Poly Aluminum Chloride (PAC) dosing system for phosphorus removal; sodium hydroxide dosing pumps for alkalinity adjustment; and 10,000-gallon storage tanks for each of the two chemicals.
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.