USWIIN-LOC69.001 | Industrial Water and Wastewater

Application:

Industrial Water

Keywords:

Wisconsin, industrial, cooling reservoir, dissolved oxygen, stratification, hydrogen sulfide, odors, impaired fishery, energy savings

Reservoir Site map

Reservoir and Plant

Reservoir

Reservoir Size:

Surface area is 27 acres, with an estimated maximum depth of 20 feet and an average depth of 18 feet.

SolarBee Installation:

Date: August 18, 2004. Installed one (1) SB10000v12 in the deepest area of the reservoir. Intake hose initially set at 14-15 feet.

Project Objectives:

Primary objectives to to remedy the existing problems: Poor mixing and blue-green algae blooms. High hydrogen sulfide (H2S) concentrations in the bottom waters, resulting in high dissolved oxygen (DO) demand. Existing grid type aeration has high maintenance, uses lots of energy, and mixes poorly increasing potential for fish kills.

Project Results:

In the fall of 2004, the intake hose was raised to about 10 feet to provide better oxygenation of upper waters and to prevent H2S from escaping and causing odors. The owners also reported good fish activity throughout the reservoir. In January 2005, under ice conditions, they measured 17 mg/L of DO in the top few feet and 7.0 mg/L near the bottom. They had never before recorded DO this high and deep in the winter. By early March 2005, DO concentrations still remained above about 5 mg/L throughout the water column. A welcomed additional benefit was the increase in water temperatures during the winter. The SolarBee kept a much smaller area of open water than their old 25-hp aerator did. This allowed less exposed water to the subfreezing air temperatures. The water remained open about 12 feet around SolarBee during very cold conditions. As a result, water temperatures were approximately 2°C higher than what was seen in past years. Owners believe that the warmer water temperatures, combined with the high DO, provide better over-wintering habitat for fish in the Pond. The owner is very happy with the results and the savings by no longer running the aerator.

Last updated at: 2009/12/10