Lochmueller Group provided design services for improvements to the wastewater treatment plant to increase wet-weather flow capacity to 9.0 mgd.
The project included the following:
- New influent wet well and replacement of influent pumps with variable frequency drives
- Installation of a vortex grit removal system with a grit classifier
- Installation of a mechanical bar screen
- Primary clarifier improvements including new flights and chains and replacement of sludge pumps
- Secondary clarifier improvements including algae covers, density current baffles, and weirs/scum baffle
- Conversion of anaerobic digesters to aerobic digesters with positive displacement blowers and coarse bubble diffusers
- Conversion of chlorination disinfection to UV disinfection
- RAS/WAS pump station upgrades
- Replacement of plant influent and effluent samplers
- Electrical/Instrumentation/SCADA Improvements
- Installation of a new stand-by generator
- Installation of magmeters with chart recorders to record plant influent and plant effluent flow
The City of Jeffersonville needed an additional wastewater treatment plant to ease the wastewater loads on its downtown plant and to build extra capacity for future growth. The new facility is capable of treating average daily flows of 3.0 mgd with peak capacity of 9.0-mgd hourly flows. Jeffersonville selected Lochmueller Group (Lochgroup) to provide preliminary engineering, design, and construction administration services.
Lochgroup used Pipeflow to model the needs of the on-site water system for the plant. The new facility includes:
- A headworks with mechanical fine screening & grit removal system
- Multiple loop reactor-type oxidation ditch
- Secondary clarifiers
- RAS/WAS pump station
- UV disinfection
- Non-potable water system
- Aerobic sludge holding tanks
- Sludge dewatering facility
Bequeathed to Indiana University in 1938, Bradford Woods has 2,500 acres of preserved natural area, the largest holding outside the state and national park systems. Its grounds have numerous accommodations ranging from tents and cabins to a restored 1912 manor house. It also serves as home to the American Camping Association and Camp Riley, sponsored by the Riley Children’s Foundation, which is internationally recognized for its work with the disabled. It also hosts environmentally-focused teaching, research, and service programs.
Bradford Wood’s aging wastewater collection system and treatment plant had long been overdue for replacement. In 2005, Center hired Lochmueller Group (Lochgroup) to design a wetlands-based natural treatment system that would honor the center’s focus on environmental stewardship.
Lochgroup designed a system where wastewater is first pretreated in three 15,000-gallon septic tanks, and then discharged into the constructed wetlands through a centralized line. Effluent then moves vertically through a gravel and sand medium on which wetland plants are rooted. Beneficial bacteria in the gravel and plant roots break down organic matter into usable forms of nutrients such as nitrogen, phosphorous, and calcium that support plant growth. The wastewater is then stored in a pump tank and either circulated back through the wetland cells for additional treatment or gradually dosed into a mound system. In the mound system, the last remaining pollutants are removed as the water percolated down through a series of pipes, sand, and gravel. Finally, the clean water flowed out of the mound and backed into the groundwater.
As a result the constructed wetland not only provided Bradford Woods with a cost-effective and environmentally-friendly alternative to traditional wastewater treatment, but the University immediately recognized its benefit as a valuable teaching and research tool. As a result, visitors to Bradford Woods are now provided with a guide to the wetlands, including the wide variety of plant species used. In addition, the Center uses the wetlands for research opportunities including studies of prairie ecosystems and constructed wetland operations.
“Not only did the constructed wetlands prove to be the most cost-effective solution for our wastewater treatment needs, but the choice also reflected our organization’s commitment to sustainable business practices and will allow us to offer better educational and informative programs to the children and adults that participate in our many internationally respected programs.” —Dr. John E. Koenig, Bradford Woods Executive Director
Lochmueller Group (Lochgroup) designed 6,300 linear feet of large-diameter interceptor sewer to carry combined sewer overflows to a treatment plant. The pipes ranged from 36 to 54 inches and were designed to eliminate the need for an existing small pump station.
In addition, Lochgroup reviewed and revised Huntington’s existing model to verify the hydraulic capacities of the proposed interceptors and ensure compliance with the required controls of the approved Long-Term Control Plan (LCTP). Upstream and downstream effects were reviewed to determine the impacts to other proposed LTCP improvements.
Lochgroup also worked with the city to incorporate the design of 3,100 linear feet of a new trail that was part of their trail master plan that ran adjacent to the interceptor. The trail used permeable pavement to facilitate stormwater drainage.
The contractor praised Lochgroup’s design documents and professionalism throughout the bidding process. “The project documents for this job were very well prepared,” wrote the contractor’s project manager. “The specifications and addenda were very well thought out and very descriptive about what will be expected.”
The City of Evansville, Indiana needed to make improvements to the West Side Wastewater Treatment Plant (WWTP) to provide additional capacity for both growth and to treat wet-weather flows. Lochmueller Group used phased construction to make improvements that nearly doubled the plant’s NPDES permit capacity of 20.6 mgd.
One of the major improvements involved the addition of a new Biological Aerated Filter, which is ideal for urban WWTPs with limited space for expansion as it requires no settling tanks and no return sludge system.
The West Side project increased the average design flow from 10 mgd to 30.6 mgd. The average design peak flow for the whole plant is 39 mgd with the average design peak flow of the biofiltration process at 20 mgd. The biofiltration process is operated in parallel with the existing activated sludge system. Other improvements included:
- Replacement of fine bar screen
- Addition of inflow bypass pipe with coarse bar screen
- Replacement of influent pumps
- Replacement of aerated grit chambers with vortex grit chamber
- Addition of chlorinated spray system for aeration tanks
- Modification of plant water system