QLH specializes in wastewater treatment. In the early years, the company's founder designed, built and installed "package" wastewater plants. The firm has evolved into one of the premier wastewater design firms in the State of Florida. Plant designs ranging from 0.1 MGD private treatment systems to 18 MGD advanced wastewater treatment facilities have been designed and implemented by QLH.
In addition to treatment plant design, the firm performs engineering work for a wide variety of wastewater related projects. Planning, design, permitting and construction services for wastewater collection, treatment and disposal systems are among the firm's offerings.
We offer specific expertise in:
The White Acres subdivision is a mix of residential properties from 0.2 acres to more than 2 acres with on-site sewage treatment. The City of Port Orange targeted the subdivision for a septic tank elimination project. QLH prepared a concept plan and conceptual costs along with an estimate of pollution abatement levels due to installation of a central gravity sewer system.
In addition, the existing stormwater system was substandard and in need of rehabilitation. The city asked QLH to design an improved drainage system that would eliminate unsightly ditches and culverted driveway crossings. Over the years, the ditches had become over excavated, resulting in standing water that was potentially a health hazard due to the septic system leaching into the ditches. The drainage system design needed to include replacing the ditches with a piped drainage system.
QLH’s services included design and permitting for the improvements, which were bid in July 2016. To construct the project, the city obtained grant funds from three different sources – Florida Department of Environmental Protection, St. Johns River Water Management District and Community Development Block Grant. These funds allowed the city to construct the project at minimal cost to the residents.
The project includes modification of existing facilities and construction of a new 6.0 MGD process train. Specific project elements include:
Influent Screening and Grit Removal
Biological Nutrient Removal
Reuse Storage and Pumping
Belt Filter Press
The firm’s staff has served as the engineer of record for the city's wastewater and reclaimed water projects since 1972. This is the most recent out of a long list of treatment projects designed for the city during the last 40 years.
The City of Cocoa Beach was required to lower nutrient levels discharged to the Banana River for compliance with U.S. Environmental Protection Agency Total Maximum Daily Load (TMDL) legislation. The existing biological treatment process was an Anoxic-Oxic process that reduced nutrients but was unable to meet the annual loading limits of 4,022 #/yr and 1,063 #/yr, total nitrogen and phosphorous, respectively. Treatment upgrades were required to achieve AWT standards and produce a 5-5-3-1 wastewater effluent. The reduced waste load allocation also required further reduction of effluent discharged to the Banana River.
The process upgrade selected incorporates a four-stage biological process with Integrated Fixed Film Activated Sludge (IFAS) suspended growth media installed in the aerobic basins. The basis of design was the Anox-Kaldness process marketed by Kruger. Process design was able to use the existing AO structures for most of the treatment volume and an additional basin was constructed for post anoxic treatment and reaeration. This process is designed to treat 6 MGD AADF to AWT standard with minimal chemical feed.
The plant upgrades include installation of new equipment for grit removal, secondary clarifiers, turbo blowers, fine screening of MLSS, biosolids thickening and digestion. The project affects and upgrades all phases of the Water Reclamation Facility (WRF) and one off-site lift station. Virtually all mechanical and electrical equipment was replaced and a fiber optic network will be installed for state of the art monitoring and control of the components and processes. In addition to the biological process improvements, a sludge centrifuge and solar drying facility were constructed to achieve Class AA biosolids.
QLH provided comprehensive planning, design, permitting, funding, bidding and CEI services for the phases of this project. A State Revolving Fund loan for $22 million was approved for construction of the treatment plant upgrades, ASR wells, technical services during construction, and contingencies. The treatment plant contract award amount for the base bid plus bid alternate #1 (centrifuge) was $15,934,958. The project was completed for that amount.
A reclaimed water ASR well was designed in addition to the process conversion and plant upgrades. The reclaimed ASR well was constructed in the Lower Floridan Aquifer to allow the city to store and recover reclaimed water to meet the shortfall between demand and supply during the dry season. This ASR well also allows the city to further minimize surface water discharge and comply with TMDL limits.
Edgewater’s Advanced Wastewater Treatment Plant was constructed in 1993. It is a 5-stage Bardenpho nutrient removal facility with two trains and a rated capacity of 2.75 MGD. The majority of existing equipment had reached the end of its useful life and required replacement and upgrade.
The project also involved addition of a third secondary clarifier, sludge thickening centrifuge and rehabilitation or replacement of the mechanical pumps and equipment. The project involved automation and control upgrades in addition to energy saving improvements. QLH provided planning, design, permitting, CEI services and assisted in the application and administration of SRF funding for the complete project.
The project design elements include: influent screening, replace existing grit separator and classifier, rehabilitation of the influent lift station, new influent flow meter, headworks and influent lift station odor control, replace equipment at 5-stage Bardenpho® biological process, new automated control system for the biological process, replace IR pumping with integral flow channels and adjustable gates within the process basin, rehabilitation of two existing clarifiers, install a new clarifier and WAS pumping, replace RAS and WAS pumps, rehabilitation Dynasand® filter, conversion from gas chemical system to liquid sodium hypochlorite and sodium bisulfite including new tanks pumps, and piping, replace six vertical turbine transfer pumps, install sludge thickening centrifuge and ancillary equipment, and replace plant-wide SCADA system and upgrade to fiber optic network.
Flagler Beach’s wastewater treatment plant has a rated capacity of 1.0 MGD. The treatment process includes biological treatment by a Carousel® process, secondary clarifiers and disinfection. The biological process was constructed in 1989 and the digester from the original package plant was being used. This project included replacement of two aerators for the biological process and expansion of the digester using the outer ring of the package plant basin. The digester expansion included demolition of existing concrete walls, installation of a new blower, diffusers and sludge transfer pump.
The project also included installation of a third potable water distribution pump at an existing ground storage tank and pump station. The pump installation included VFD controls, control panel and SCADA upgrades.
The Williamson Boulevard Lift Station serves the southwest portion of Port Orange’s sewage collection and transmission system.
The service area includes many large developments including Water’s Edge, Cypress Head, Summer Trees and Spruce Creek Fly-In. Future developments include Woodhaven and new developments along the Williamson Blvd. Corridor. The build-out population served is 18,500 with a peak flow capacity of 3,000 GPM. The flow from the region is conveyed via a 16-inch force main to the ‘re-pump’ station (Williamson Boulevard Regional Lift Station). The station has three 1,500 GPM pumps with Variable Frequency Drives.
The station has a 30,000 gallon wetwell, emergency power, odor control and automatic bypass valves. A pre-cast, climate controlled building encloses the VFDs and controls. The valves and bypass connections are above ground for ease of maintenance and access. The project has been in service since 2015 and has experienced no problems since initial commissioning.
QLH prepared Port Orange’s Utility Master Plan and all hydraulic modelling for the water, reclaimed water and force main systems. The planning and modelling results identified the need for a regional lift station west of Highway I-95. This design is the result of that recommendation.
The City of Holly Hill, Volusia County, FL, owns and operates a utility system that provides water and wastewater service to its residents, business and unincorporated customers in the service area. The sewage collection system annually treats approximately 1.5 MGD of primarily domestic sewage. Much of the city’s collection system is greater than 40 years old and most is vitrified clay pipe (VCP).
A complete sanitary sewer evaluation study (SSES) was performed to assess the condition of existing sewer lines. They were subsequently graded and categorized based on condition, with 5 being the worst and 1 being the best. Bid documents were prepared to line approximately 67,000 linear feet of sewer, repair approximately 40 manholes and seal approximately 1,092 laterals. Upon receipt of bids, the city awarded a contract for $2.4 million to Lanzo Lining. It was completed April 2012.
QLH performed contract administration and inspection duties for the 1 year project. All lines were televised and lined with a cured-in-place fiberglass liner. Manholes were coated with ‘Spectrashield’. Upon completion of the lining program, a noticeable decrease in wet weather flow was observed at the wastewater treatment plant.
This project consists of the conversion of an existing can regional lift station to a submersible style. The conversion included installation of three submersible pumps, wetwell top slab, valve vault, controls and standby generator. Rehabilitation of the existing wetwell included a fiberglass spray-in liner. The triplex pump station includes a programmable controller with level transducer and an independent float control system.
QLH completed the design, permitting, bidding assistance, construction administration, and inspection for this project. The project was designed in a manner to minimize by-pass pumping needs and outages. Innovative construction techniques were incorporated into the design due to work area limitations.
The subject project involved the construction of more than 10,000 linear feet of force main sizes 6-inch to 20-inch, over 11,000 linear feet of reclaimed water main sizes 8-inch to 24-inch, and over 10,000 linear feet of potable water main sizes 8-inch to 24-inch along State Road 415 between Howland Boulevard and Doyle Road. The utilities were constructed in advance of the Florida Department of Transportation four-lane project, which presented many challenges. The contractor, with QLH’s assistance, maintained clearances for storm sewer pipe to be installed in the future during the widening project. Florida Department of Transportation plans were not finalized when the utility project began so QLH was making construction revisions as FDOT design changes were made.
The project was a challenge as it had to be completed and contractor demobilized in nine months.
Clarence Swimm was on-site, as required, and provided the city with daily reports documenting contractor progress and installed quantities. He received engineering and administrative support from the main office throughout the project. The construction services supervisor, Gary Wisniewski, routinely visited the site and attended meetings during the course of construction providing for seamless supervision and minimal communication problems.
The QLH team tracked the contractor’s progress by comparison to the approved schedule. Regularly scheduled coordination meetings were conducted. Progress and coordination problems were noted to the contractor within meeting minutes and other correspondence.
Several conflicts with other utilities arose during the course of constructing the utility mains. QLH’s team coordinated with the contractor and the affected utility in resolving these conflicts to avoid delays. QLH required the contractor to hand-locate existing underground utilities ahead of construction. This allowed the conflicts to be resolved in advance of the pipe installation.
Monthly pay requests were reviewed by the project manager and inspector in draft form prior to official submittal. Certified as-builts were required with each pay request to confirm installed quantities and correct installation per plans.
The project was completed within the time frame allotted and within the contract amount.
Similarities: The similarity of this project to the Mount Dora project includes construction of new utility mains. This project involved potable water, wastewater, and reclaimed water transmission within FDOT right-of-way, in advance of the FDOT’s roadway widening project. The project was fast tracked and all work was successfully completed prior to road construction.
Completion Date: February 2017
Months to Design: 12 months (design, permit, funding)
Months to Design: 10 months (design, permit, funding)
Months to Design: 9 months (design, permit, funding)
The project involved the increasing plant capacity from 4.0 MGD to 6.0 MGD, rehabilitation of all mechanical pumps and equipment, and addition of mechanical thickening and odor control. The design included a new 2.0 MGD Carrousel structure, new RAS/WAS pumping facilities, two new rotary drum thickeners, odor control and replacement of miscellaneous mechanical components. The design allowed for expansion to a design capacity of 8.0 MGD. The plant’s instrumentation and control system was re-designed to incorporate a fiber optic data hi-way network with PLCs providing real time data updates to the plant- wide monitoring network. Karst formations in the area and test borings indicated the potential for sinkhole formation and/or soil subsidence. As such, the proposed Carrousel structure was designed with an auger cast pile foundation.
The City of DeLand owns and operates a 6.0 MGD advanced wastewater treatment plant serving the city and surrounding unincorporated areas. The plant currently treats approximately 3.0 MGD of influent flow and distributes approximately 3.2 MGD of reclaimed water to its customers. Seasonal peak demands can exceed 5.0 MGD; therefore, augmentation is necessary.
The city has a surface water intake from the St. John’s River about seven miles from the wastewater treatment plant. A 4.0 MGD pump station at St. John’s River conveys surface water from the river for subsequent filtration, disinfection and distribution. Due to the seasonal variation in water quality from the river, a coagulation and flocculation basin was constructed, in conjunction with the filters, to provide for chemical coagulation and mixing.
The project design required an additional 4.0 MGD of filtration capacity. QLH evaluated various filtration options with city staff. It was mutually decided to retrofit the existing traveling bridge sand filters with new ‘Aqua Diamond’ filters and increase the total plant filtration capacity from 6.0 MGD (AADF) to 12.0 MGD (AADF).
This upgrade project included retrofit of two 2.0 MGD sand filters with two 5.0 MGD Aqua Diamond filters. It provided an additional 6.0 MGD capacity at average flow and an additional 12.0 MGD at peak flow. In this manner, the plant is able to treat 4.0 MGD of surface water from the St. John’s River and 8.0 MGD of effluent. The ultimate plant capacity at this site is 8.0 MGD.
This project received funds from St. Johns River Water Management District Cost Share Program (40 percent). The final construction cost is $2,497,449. There was an $1,484,805 deduct for Owner Direct Purchase of filter equipment. The construction was completed in February 2016.
The aeration and instrumentation project was the upgrade of three 2.0 MGD carrousel oxidation ditch BNR reactors to include six 75 HP, low speed mechanical surface aerators with surface impellors and a submerged radial “pumping” impellor, including Excell™ Velocity Enhancers. Install a Oculus™ Control System for monitoring of D.O. and control of aerator VFDs and carrousels for each process train to reduce energy consumption and further reduce total nitrogen below 5.0 mg/l. The project also included replacement of remote PLCs and upgrade of the entire plant telemetry system. A $604,000 SJRWMD/FDEP Cost Share Grant was received for this project.
The project is in service and exceeding expectations. Effluent TN concentration are < 1 mg/l.
This project included the rehabilitation of Lift Station #16 by conversion of the existing can style lift station into a submersible station. Work included demolition of the two existing pumps, piping and valves to abandon pump can. Installation of two new submersible pumps, wet well upgrades, top slab, piping, valves and valve vaults, lining of an existing manhole and the installation of a new force main.