At a Dec. 12 Morgan City Council meeting, it was announced that sewer funding had been approved through the State of Utah. Morgan City will have a $2.8 million budget for necessary improvements to the current sewer infrastructure.
The benefit to receiving money from the State of Utah is that the city will not be tied to arduous federal regulations. Morgan City manager Ty Bailey also noted that the City is “not tied in to spending the entire amount if it is not needed,” and said he feels good about this number with only a 1.5 percent interest rate.
In compliance with regulations, there will be a public comment period that began the day of the council meeting and continues through Jan. 9, 2018. Comment cards are available at the City or on the City website. You can also view the entire Wastewater Treatment Facilities Plan at either location; however, for your convenience, a condensed version is provided in the following paragraphs.
According to the Wastewater Treatment Facilities Plan, Morgan City will need to construct a nutrient removal facility in the relatively near future due to the phosphorus rule and other pending permit requirements. In order to ease the transition, they have elected to address their wastewater treatment needs in phases.
Phase 1 improvements will help the lagoons maintain compliance with their current permit while at the same time setting the city up for a future Phase 2 nutrient removal facility. This approach allows the City to improve the performance of the lagoons during the time it takes to plan for the more expensive Phase 2 improvements.
The plan states that at this time, Morgan City is only proposing to construct the Phase 1 improvements.
Island Road lift station
The majority of the town’s sewage is routed through the Island Road lift station. This lift station is nearly 30 years old and needs to be rehabilitated. Most of the metal components inside the wet well structure are severely corroded. The wet well floats have failed several times in the past and need to be replaced. The piping and access hatch also need to be replaced.
Headworks and administration building
The second factor in Phase 1 is the headworks and administration building. The future nutrient removal facility will require a mechanical fine screen and grit removal system. This system has already been procured by the City. The headworks skid is oversized to accommodate peak hour flows. The design basis for this higher flow rate is to be able to accommodate the absolute worst case scenario of all four pumps operating simultaneously. It is not anticipated this would ever occur, only in the event of extreme flooding.
The headworks/administration building will include the screening and grit removal room, storage room, MCC room (sized for potential future mechanical facility), office/control room, laboratory (sized for potential future mechanical facility), bathroom, and mechanical/janitor room.
Water to the new facilities will be provided by a culinary water well, which has already been drilled by the City. The culinary water will be delivered to the administration building, where it will be utilized for culinary water demands at the facility. In addition, a water booster pump skid and break tank will be located in this building.
As part of this project, the back-end of the treatment facility will be reconstructed to accommodate a new chlorine contact chamber, improved reaeration system conditions, and permanent structures to prevent freezing. In addition, a permanent recycle pump station will be constructed. All of these new facilities will help bring the lagoons into compliance with their existing permit and are suitable to be used in the future Phase 2.
Another component will be the nutrient removal facility, which includes a chlorination system. Per Utah Administrative Code (UAC) requirements “duplicate disinfection systems shall be provided.” However, the existing chlorine disinfection system doesn’t meet that requirement. As part of this project, two chlorinators will be installed (duty/standby) with automatic switch over.
Currently, Morgan City lagoons cannot reliably meet their permit limit for E.Coli. According to the study, the primary reason for this is because the chlorine contact pipe does not provide adequate volume/detention time for disinfection. As part of the Phase 1 improvements, a new chlorine contact chamber will be constructed.
Much of the year, a dechlorination chemical is added to reduce the chlorine concentration in the system. The dechlorination system is working well since it was installed in 2011. All of this equipment is in good condition and will be reused as part of this project. However, the injector can freeze during the winter months. As part of Phase I, the injection location will be located inside the new disinfection building so freezing will no longer be a concern.
In 2012, a reaeration system was installed in the chlorine control structure to increase the effluent dissolved oxygen concentration, which was impacted by the addition of the oxygen-scavenging sodium bisulfite. The reaeration system utilized existing infrastructure in a small/shallow basin, which was not ideal for oxygen transfer. As a result, the effluent is not always in compliance.
As part of this project, the volume and depth of the reaeration basin will be significantly increased to provide adequate time for oxygen transfer. The new reaeration basin will be located between the two chlorine contact chambers. A new, larger blower will be installed to optimize oxygen transfer. The existing blower will be relocated inside the new building to be used as a backup. New diffusers that are less prone to fouling will be installed inside the reaeration basin.
A submersible recycle pump will be installed upstream of the weir inside the chlorination box. This pump will also serve to drain the chlorine contact basins when they need to be cleaned. The recycle flow will help maintain the required dissolved oxygen concentrations in the lagoon cells and improve compliance.