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Learning Articles
May 09
Designing an Underground Infiltration Basin
The design of every underground stormwater system is unique, so it’s important to develop a site-specific plan. However, the first step in this process should always be the same: completing a soil evaluation. This will determine the properties of the… Read More
May 09
Fixed vs. Moving Bed Systems: Surface Area and Kinetic Rates
The specific surface area of moving bed media is reported to be roughly 150 ft2/ft3 (500 m2/m3). Brentwood’s fixed bed system, AccuFAS, has a specific surface area of 50-96 ft2/ft3 (165-315 m2/m3). These “nominal” numbers may be somewhat misleading in terms… Read More
May 03
Fixed vs. Moving Bed Systems: Media Retention and Headloss
Submerged fixed-film media is utilized within aeration basins to optimize biological treatment and increase capacity. Therefore, proper design and installation of the equipment used to keep the media in the aeration basin and prevent it from passing downstream is critical… Read More
Apr 26
Fixed vs. Moving Bed Systems: Basin Geometry
Aeration basins can have length to width (L:W) ratios varying from 1:1 (square) to over 30:1 (plug flow). The L:W ratio of an aeration basin directly impacts both the physical installation and biological performance of a submerged fixed-film system. Physical… Read More
Apr 19
Submerged Fixed Film: Top 5 Considerations for Evaluating Different Systems
Submerged fixed-film systems are ideal for significantly increasing nitrification in existing wastewater treatment plants. A well-designed and operated system can double the nitrification capacity of an existing aeration basin. When choosing media for fixed-film applications, typical options include small, floating… Read More
Jan 29
How Nozzles Work Within a Cooling Tower System
Why Are Nozzles Important? Everyone knows how important the fill is to a cooling tower’s performance. Since fill is the heat transfer medium around which the “box” that is the cooling tower is built, you could argue that it’s the… Read More
Jan 21
The Top 5 Raw Material Considerations For Choosing A Stormwater System
Raw material make-up is one of the largest differentiating factors between products within the stormwater management industry. With growing cost concerns came the increased use of recycled material. The problem with this approach is that all recycled materials are not… Read More
Jan 04
Understanding the HS-25 Classification
As with most stormwater management topics, this explanation has both a simple and a detailed answer. The simple answer is that we use the HS-25 classification to rate the strength of a system so that we know where it can… Read More
Dec 15
Can an underground stormwater system be installed in fill?
The process of grading a site requires one of two practices, either cutting or filling. Cutting is the process of excavating material to lower the finished grade from the existing grade, while filling is the process of placing material to… Read More
Nov 19
Choosing the Right Fill for Your Tower & Application
A question we often receive is, “How can you be certain that a particular fill will work in my tower?” Well, first, we take a stack of cards and write one fill model on each card. Then, we go… Read More
Oct 01
Cooling Tower Drift vs. Splashout
Drift can be defined as the water that is emitted along with the exhaust air of a cooling tower. The drift droplets that escape contain the same chemical, bacterial, and particulate matter of the circulating water from which they… Read More
Sep 24
FM Certification Questions Answered
We received a comment on our first FM Approvals blog post and decided to dedicate another post to the answer. You can check out the original article and comment here. In a nutshell, the user commented that FM certification is… Read More