Harrisburg Water Reclamation Facility

Harrisburg Water Reclamation Facility

Here is some basic information regarding the Harrisburg Water Reclamation Facility:

What is the Harrisburg Water Reclamation Facility (WRF)?

The Harrisburg Water Reclamation Facility (WRF) is a facility is designed to treat 1,000,000 gallons of wastewater per day (gpd) and is expandable up to 4,000,000 gpd with the future growth of our city. With our current average wastewater flows at 300,000 gallons per day, we have enough extra capacity today for an estimated additional 13,000 people.

At full expansion at 4,000,000 gpd, our facility could serve a population of about 80,000 people. Based on our growth estimates, we would probably reach that projected population in 2075 or so. We have a large site, and so expansion or reconstruction above that 4,000,000 gallons is likely feasible there as well, but who knows what Harrisburg will look like in 50 plus years.

Who are the project engineers?

Stockwell, Henry Carlson Construction, and PKG are all helping on the projects.

Who will the WRF serve?

The WRF will serve all current residents as well as the residents in the projected future growth area.

What is the timeline for this project?

The WRF started on July 1, 2020, and has been working on building the facility ever since. The construction will have substantial completion on August 2, 2021, with final completion, and a fully operational facility, set for October 1, 2021.

Where is the WRF being built?

As you may see from the layout image above, the WRF is being built directly south of 274th street and directly east of Southeastern next to Nine Mile Creek. The address is 47631 274th Street Harrisburg, SD 57032. The overall size of the facility consists of 140 acres.

Why are we building the WRF?

The WRF is being built as a means to better serve our existing residents as well as serving the needs of those who come in the future. By building this facility now, we are going to save ourselves time, money, and resources down the road.

How much is this costing us?

The facility itself cost $16.4 million. The total cost for the entire project, including land, lagoon reclamation, and the 5-mile forcemain to the Big Sioux River, is $25.8 million. Depending on the rate of population growth, this facility will handle our flows for 15 to 20 years before an expansion is needed.

For some historical context, we send out raw wastewater to Sioux Falls for treatment, which we had to do because we were unable to treat it ourselves with our current infrastructure. We have projected by 2025 our yearly treatment costs would exceed $1.5 million. We have obtained a loan in which the interest is locked in and the repayment price set at $1.44 million per year over 20 years. We have projected over 20 years, it would cost us $80M to continue pumping our water to Sioux Falls for treatment, whereas by building this facility, the projected total cost would be $66M.

What will the WRF actually do?

There are basically 8 steps to the treatment process.

  1. Our sanitary sewer system collects wastewater for each point in our system and gravity flows or is pumped to the main pump station.

  2. At the main pump station, wastewater is metered into the new wastewater facility via pumps.

  3. In the headworks building, the wastewater undergoes pretreatment, consisting of a perforated plate mechanical screen, which removes larger debris.

  4. The next phase is a biological treatment, which is an Aeromod system consisting of the extended aeration method of treatment. This phase includes 3 stages of aeration in a series of large (2.4concrete basins. Activated sludge, consisting of microscopic organisms, is mixed with the wastewater along with infused air resulting in the biological breakdown of organic wastes.

  5. Water then flows to clarifiers which removes the activated sludge and recycles it back into the basins, and water is carried through to final treatment.

  6. As the activated sludge consumes organics, the mass grows, and some of this excess growth is removed and sent to aerobic digestion and dewatering. This sludge is then sent to our biosolids storage area, where this sludge can either be land applied as fertilizer or landfilled.

  7. The last step is disinfection of the treated water with UV light and then reaerated.

  8. The treated water is then pumped via forcemain five miles to the Big Sioux River where is it discharged.

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What sort of facility will this be?

Our facility will be held to the EPA and South Dakota Department of Environment and Natural Resources’ Surface Water quality standards The facility will be operated by two current City of Harrisburg staff members who are trained in the operation of such a facility.

What will happen to the current water treatment site?

Our current lagoon wastewater treatment facility will be decommissioned within a few years of the WRF becoming fully operational. Water will be removed and treated at our new facility and the remaining sludge will be dried and either landfilled or land applied. We will retain part of the southernmost basin of the current site as an emergency equalization basin.

Who do I contact with further questions?

If you have any further questions or would like additional information, feel free to email Contact@harrisburgsd.gov