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 Strategically Advances Environmental Service Expertise

July 23, 2020 (Bloomington, Minnesota) – ISG, a professional design and engineering firm made a strategic advancement to expand its services by welcoming Julie Blackburn as its new Environmental Practice Group Leader, out of the firm’s Bloomington office. Joining 300+ employee-owners including a team of in-house environmental scientists, Julie, the former Governor’s appointee to the Lessard-Sams Outdoor Heritage Council, brings over 25 years of passion for identifying environmental solutions and will guide the firm as it takes the next step in becoming an industry leader in environmental services.
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ISG Named Business of the Year by Grow Cedar Valley

June 22, 2020 (Waterloo, Iowa) – Based on its growing presence in eastern Iowa and efforts to give back to the community, ISG has received the 2020 Business of the Year Award from Grow Cedar Valley, an organization devoted to the growth of businesses in the region. ISG’s Waterloo office was honored as one of two businesses of the year (1-50 full-time employees), marking the firm’s growing impact in the region since expanding its footprint to Waterloo in 2018.
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