HAB has downloaded and processed the buffered alum application data from the barge’s guidance and dose control computer system. The dose rate coverage map shows each individual application path that were recorded over the course of the Moody Lake application. We are extremely pleased with the precise application and uniform coverage of the 17-acre application…
The first photo of the cyanobacteria (blue-green algae) bloom was taken at Moody Lake the afternoon before the buffer alum application was conducted. The second photo, showing the clearer water, was taken at the same location on the morning after the application. This dramatic and immediate change is a result of the alum floc removing…
Today HAB demobilized their equipment form the Moody Lake project work site and we are already preparing for our next project later this month in Burnsville, MN. There is no greater measure of success than safety and Moody Lake marks HAB’s 77th project without a safety incident. A special thanks to HAB’s Alum Transfer Specialist…
Today the Moody Lake buffered alum application project was completed on schedule! As planned, the exact dose of over 15,000 gallons of alum and 7,000 gallons of buffer was applied in a precise and uniform manner. The HAB team’s efficiency was high and we were able complete all of the application in one day. The…
HAB spent the first day of the Moody Lake project preparing equipment for the application. This included assembly of the barge’s application boom, programming the barge’s computerized dosing system, launching the barge into the lake, setting up on-shore storage tanks and confirming the delivery plan for the alum and buffer. A small restricted work area…
Aluminum is considered a non-essential metal because fish and other aquatic life do not need it to function. There is a large body of scientific literature documenting the safe use of alum in lake environment conditions, which has allowed the North American
Lake Management Society to fully endorse its use (NALMS, 2017).
Alum has been repeatedly shown to be safe for humans. Alum is a common
food additive and has also been used for decades to clean our drinking
water before consumption. HAB uses the exact same drinking water certified
alum when preforming a lake improvement application.
Alum (aluminum sulfate) is a nontoxic liquid that
is commonly used in water treatment plants to
clarify drinking water. It’s use in lakes began in
the early 1970’s and is used to reduce the amount
of phosphorus in the water. Lower amounts of phosphorus lead to lower amounts of algae and the symptoms associated with poor water quality. Alum is most often used to control phosphorus release from the lake bottom sediments (internal loading). Research has shown that even when external sources of phosphorus from the surrounding watershed are lowered, the internal cycling can continue to support signi cant nuisance algal blooms.
Phosphorus enters lakes from two sources. Phosphorus entering the lake from outside sources are called external sources. These sources originate in the watershed and are either directly rinsed into the lake or flow to a stream that enters the lake. Common external sources include lawn fertilizers, septic systems, agricultural practices, stormwater, soil erosion and geese: anything that causes phosphorus to enter the lake from the watershed.
Once the external source of phosphorus enters the lake, it is deposited in the lakebed and is recycled back into the water column. This is the second source of phosphorus and it originates from within the lake itself. This is called an internal source and these inputs are most common during the summer
and winter when water oxygen concentrations are low or zero near the bottom. This condition causes changes in the chemistry of the lakebed that lead to the phosphorus leaching out of the sediment and into the water.
Lake property is aesthetically and economically desirable throughout the world and it is well-established that property values are tightly linked to the quality of the lake.