Wastewater
Aberdeen Wastewater Treatment Plant Improvements
Aberdeen, SD
Banner provided the planning/design/construction phase services for the original Aberdeen wastewater treatment facility (WWTF). Changing permit conditions and aging equipment required phased upgrades. Major project components for the Phase I Improvements included replacement of six screw pumps, pretreatment equipment, BioFilter equipment, two final clarifier mechanisms, and UV disinfection equipment. Four new aeration basins and a new blower building (with new blowers) were constructed as well. Major improvements for the Phase IIA project included a new chemical feed building, along with a monitoring and control system for eqiupment and processes. Major improvements for the Phase IIB project included the addtion of Dissolved Air Flotation (DAF) process, replacement of two primary clarifier mechanisms, and replacement of boiler/heat exchanger equipment, pipes and valves, and sludge pumps in the digester process. In addition, improvements were made to provide asphalt paving of the City's equalization basins.
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Southeast Lake Drive Wastewater System Expansion
Lake Poinsett, SD
The Lake Poinsett Sanitary District continued toward their goal of providing sanitary sewer collection and treatment to properties surrounding the lake by completing the Southeast Lake Drive portion of their construction plan. The project area is located along the southeast corner of Lake Poinsett and provides sewer service to an additional 90 customers. The work included three main lift stations; over four miles of gravity sewer pipe, force main, and sewer service lines; and several individual grinder stations. To accommodate the increased wastewater flow, an additional wastewater stabilization pond was constructed adjacent to an existing facility.
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Pierre Wastewater Treatment Plant
Pierre, SD
Early phases of the project included rehabilitation of the facilities influent pumping station, new primary clarifiers, replacing RBCs with a new activated sludge process, and new final clarifiers. The system also included a new air lift pump station, dissolved air flotation process, and a new Autothermal Thermophilic Aerobic Digestion (ATAD) system. Future phases include replacement of grit removal equipment, primary clarifier mechanisms, and a planned new ultraviolet disinfection process.
Permit compliance has always been the goal for the PIerre WWTF. Early project stages were phased to allow construction of the aeration basins and final clarifiers first as they have the most impact on the effluent quality. The ATAD system was selected due to the ease of operation and ability of the process to achieve Class A biosolids, allowing maximum flexibility with final end use of the solids. The future phases, recently bid and under design, also have permit compliance as the primary goal. Ultraviolet disinfection will provide a reliable means to maintain permit compliance for coliforms, and will also allow the City of Pierre to discontinue using chlorine gas for disinfection.
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Prentis Street Lift Station and Sanitary Sewer Improvements
Vermillion, SD
The existing Prentis Street Lift Station was originally constructed in 1968. It began showing significant corrosion, and much of the lift station equipment had reached the end of its useful life. A Facility Plan recommended replacing the 48-year-old lift station with a larger lift station to meet the demands of the sewer basin it served. A new, larger can-style lift station with a larger, adjacent wetwell was designed. To improve safety for the City maintenance crew, the lift station was relocated out of the street to a nearby residential lot and an emergency generator was installed. Fencing was incorporated into the design to screen the site from adjacent homes. The project also required upsizing over 2,000' of downstream sewer along Clark Street and Plum Street. Partial street surfacing removal and replacement was necessary to facilitate the lift station and sanitary sewer replacement. Project funding was provided with a $515,000 Community Development Block Grant and a $812,000 State Revolving Fund loan.
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Aurora Wastewater Facility Improvements
Aurora, SD
This project included construction of 2-cell stabilization pond system and conversion of the existing stabilization pond to a constructed wetland. In addition to these items, a new lift station and forcemain were constructed to accommodate the new location of the ponds. All interpond piping, valves, and structures were included in the project to allow the necessary movement of the water between stabilization ponds and constructed wetland.
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Hurley Sanitary Sewer Collection System Improvements
Hurley, SD
The sanitary sewer collection system replacement project was a substantial undertaking for the City of Hurley. This project resulted in approximately 30% of the mainline collection system being upgraded to PVC pipe. Work consisted of installing new sanitary sewer main and services under city streets and in narrow alleys. Once the project was complete, nearly 20 city blocks of street were improved with new asphalt and base course, and a new sanitary sewer collection system. Banner assisted the City by ranking the severity of needs on each segment through the facility planning process which allowed the City to develop a phased approach to improvements.
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Link Snacks Wastewater Treatment
Alpena, SD
As demonstrated with the wastewater pretreatment facility design for Link Snacks, Inc. in Alpena, Banner has the capability to address high-strength industrial wastewater treatment. Previously, the industry's waste was pretreated with a dissolved air flotation process and then sent to the City's anaerobic lagoons and retention ponds located several miles out of town. However, issues with the pond process and the industry's growth required additional pretreatment closer to the source of the wastewater. Link Snacks, Inc. sought Banner's experienced staff to evaluate five aerobic and anaerobic treatment processes. Based on a lifecycle cost and performance analysis, an anaerobic membrane bioreactor (AnMBR) was recommended for the industry's high strength waste. The AnMBR is operational and achieves the required reductions in BOD5 and TSS concentrations for this process. The AnMBR process is followed by an activated sludge/final clarification process for nitrification and hydrogen sulfide reduction. Nitrogen and phosphorus removal will be achieved with the future addition of an anoxic tank. A belt filter press is also provided for solids handling.
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Bel Brands Wastewater Treatment
Brookings, SD
A sophisticated industrial wastewater pretreatment design was required for the Bel Brands USA cheese processing facility in Brookings. Overall, the system reduces the strength of the wastewater to minimize the impacts to the Brookings Wastewater Treatment Facility. Its primary treatment method is Dissolved Air Flotation (DAF) followed by an Upflow Anaerobic Sludge Blanket (UASB) digestion process. The facility also includes flow equalization and an odor control system. On the front end, a flow equalization (EQ) tank allows the facility to avoid slug loads and spread the loading out through the day. The DAF process efficiently reduces solids loadings including fats, oils, and grease to protect the operation of the UASB process. The UASB process decreases the organic loading concentration to meet the industrial permit for discharge into the Brookings wastewater treatment system. Due to the close proximity of these facilities to Brookings, odor control facilities were included to draw air from the DAF and EQ tank and treat it in a fixed film (woodchip) bioreactor bed to tie up odor-causing compounds before releasing it into the air. The industrial pretreatment facility was designed to minimize energy needs while meeting the treatment goals. The UASB give off biogas—mostly methane like in natural gas—that is available in sufficient quantities to fire a boiler, providing heat back to the system to maintain temperatures. The warmer treated wastewater and cooler raw wastewater are run through a heat exchanger to preheat the influent water and minimize the heat required to maintain temperatures in the reactor. This process offers significant energy savings and reflects the design intent of minimizing energy consumption while meeting the treatment goals. The project was constructed in a time frame to coordinate with the start up of the cheese processing facility, and was completed within the budget for the project. This project was unique in that the City of Brookings participated with Bel Brands to construct the pretreatment facility. Banner Associates worked close with both owners to identify both the major goals of the process as well ongoing needs throughout the design and construction of the facility.
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Sylvan Lake Wastewater Improvements
Custer State Park, SD
Custer State Park is responsible for treatment of wastewater flows from the Sylvan Lake Resort and the surrounding region. Banner’s design of the first Submerged Attached Growth Reactor (SAGR) in the state replaced their sand filter polishing process. The SAGR follows a two-cell stabilization pond system and provides low-maintenance polishing of the wastewater prior to discharge. The SAGR process is capable of ammonia removal even during cold climate operation. Banner performed extensive research on three polishing process options downstream of the ponds, ultimately selecting the SAGR system. Test data from December 2013 to February 2014 show ammonia-nitrogen levels ahead of the SAGR process from 1.66 to 5.43 mg/L (as Nitrogen). Following the SAGR, ammonia-nitrogen levels were 0.050 to 0.064 mg/L (as Nitrogen) with 6°C water temperatures. In addition to the SAGR reactors, the facility improvements included flow distribution process piping, equalization, ball cover for algae control, and compressors housed in an enclosure to support the SAGR system.
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Vermillion WWTF Improvements - Pump Station
Vermillion, SD
Due to aging equipment, the City of Vermillion replaced their 50-year old main wastewater pump station with a new pump station that also added capacity and redundancy with a new parallel force main. The new wetwell/drywell lift station was constructed adjacent to the current station on the east bank of the Vermillion River. The design of Vermillion’s Main Lift Station incorporated influent grinding, a self-cleaning trench type wetwell, four (4) variable frequency drive (VFD) wetwell/drywell pumps, a pump maintenance area, 250KW emergency power generation, a fiber optic connection to the plant SCADA, room for two future equalization pumps, and land area for a future wastewater equalization pond. The station was designed according to Hydraulic Institute Standards 9.8 - Rotodynamic Pumps for Pump Intake Design Standard. With the current pumps, the station achieves a firm pumping capacity of 4.5-million gallons per day (MGD). The station is designed to allow expansion to 5.8 MGD. Construction of the lift station was concurrent with major improvements at the City’s wastewater treatment plant. Since the system has been put into operation, the City has performed multiple successful cleaning operations that have kept the wetwell free of grit and debris, and greatly reducing maintenance requirements.
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