Kingsley Wastewater Treatment Plant

Kingsley, IA | Water

Overview

ISG designed the retrofit of existing wastewater treatment lagoons for the City of Kingsley, enabling more compliant and higher capacity wastewater treatment processes.


Opportunity

Anticipating growth over a 20-year planning period and with its wastewater treatment facilities no longer able to keep up with local standards, the City of Kingsley needed a water solutions partner to design system updates.

Solution

The City of Kingsley’s existing continuous discharge aerated lagoon was not capable of meeting NPDES effluent limits after changes were made to Iowa’s water quality standards. Following a detailed alternatives analysis, ISG recommended retrofitting the existing wastewater treatment lagoons using a Submerged Attached Growth Reactor (SAGR). The SAGR is primarily designed to provide nitrification (ammonia removal) in cold to moderate climates. The SAGR consists of a submerged gravel bed with evenly distributed wastewater flow across the width of the cell providing the necessary surface area for growth and attachment of a nitrifying biomass within the bed. The gravel bed is covered with a layer of peat or mulch for insulation. Aeration throughout the floor of the SAGR provides aerobic conditions that are required for nitrification. An effluent ultraviolet disinfection system also allows the City to meet more stringent bacterial limits during summer months.

Since the Iowa Wastewater Facilities Design Standards did not specifically address the SAGR type process, the Iowa DNR had to perform a technology analysis in order for Kingsley to proceed with the project. Based on the IDNR review, the SAGR system was approved as an acceptable alternative technology, and the City of Kingsley proceeded with one of the first installations in Iowa using the SAGR technology.


Market News

ISG adds Dynamic Talent to Further Advance Resources for Clients

ISG, a professional design and engineering firm, continually strives to find the right solutions for its clients. With 12 diverse markets that expand across the Midwest, the services offered strengthen relationships through the talented pool of employee owners that comprise ISG’s multi-disciplinary team.
Read More

ISG Adds Strategic Talent to Bolster Water, Transportation, and Government Business Units

February 11, 2021 (Mankato, Minnesota) – ISG is excited to welcome Darrell Pettis, PE, to its growing team. As Le Sueur County’s County Administrator, and previously their County Engineer, his vast experience covers leadership, administration, and engineering. Some of the significant works Pettis completed at Le Sueur County included multiple government buildings leading planning, design, and finances to bring those to life.
Read More