JMS Low-Profile Cascade Aerators


The Most Efficient and Economical Method for Post Aeration
The JMS Low-Profile Cascade Aerator (LPCA™) is a free flowing, efficient, packaged, channel-type aeration device that can be installed in new or existing treatment facilities at an economical cost.



JMS LPCA Features & Benefits

• The JMS LPCA is an open-channel type aerator for use in a liquid containing basin, pipeline, or channel. The purpose of this unit is to raise the dissolved oxygen (DO) concentration level of the treated basin effluent.

• This is a cascade design only in the sense that the water in the unit gravitates successively over stages of baffles. But, in contrast to prior art-cascade designs, where water falls steeply from step to step (requiring great depth for installation), the JMS LPCA utilizes optimum slopes of less than 5.5 degrees. To achieve the desired performance in this low-slope design, each channel is fitted with a series of turbulence-control aeration baffles and air-induction plates.

• The sloping bottom of the JMS LPCA is divided into multiple channels. Each channel is provided with several low-head aeration baffles staged to create velocity and pressure changes throughout the length of the channel and air infusion plates are attached to the crest of the baffles for injecting air into the liquid.

• Flow into each channel is controlled at the inlet by a weir. Weir heights vary for each channel. The first-stage channel is designed for the minimum flow rate of the treatment facility being served.

• All channels slope to a common receptacle that connects to an opening that communicates to the exterior of the basin.

• When installed in a liquid-filled basin, the aerator inlet is submerged below the liquid surface to prevent floatable solids from passing through the aerator. The aerator may be fitted with adjustable legs for supporting, leveling, and anchoring the aerator and/or to retrofit to existing lagoons or treatment basins.

• The refined, small air bubbles and mixing created by the combination of natural gravitational forces and controlled applications of velocity, pressure differentials, baffles, air induction plates, and controlled head make the JMS LPCA the most efficient and economical method for post aeration.

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Oxygen Transfer Testing

Laboratory Test 1 and Test 2 (below) were performed at Mississippi State University, using a model 12” wide x 10’ long to determine optimum transfer efficiencies. Clear tap water was deoxygenated by sodium sulfite in the presence of cobalt chloride. Flow was induced and readings taken at timed intervals using two rapid response D.O. Meters. The recorded readings from deoxygenation to total saturation were plotted to determine the mean average oxygen transfer efficiency. Testing was performed with varying Heads (h”) through 6”. Efficiency is approximately the same from 2”(h) through 4”(h).

TEST 1 Probe 1 Probe 2 O2 Rise 1.8 4.3 2.5 2.1 4.6 2.5 3.2 5.8 2.6 3.7 6.4 2.7 4.3 6.6 2.3 4.5 7.0 2.5 5.1 7.6 2.5 5.7 8.3 2.6 5.9 8.6 2.7 Average rise per linear foot: .255 mg/l/ft

Mississippi State-Test 1 Date: 7/14/88 Location: Mississippi State University Flow rate: 100 GPM Head: h=2” Temperature: 23ºC Saturation @ sea Level: 8.7 PPM Time intervals of D.O. sampling: Each 30 sec.

TEST 2 Probe 1 Probe 2 O2 Rise 3.6 5.8 2.2 3.8 6.2 2.4 4.2 6.4 2.2 4.4 6.4 2.2 4.6 7.0 2.4 4.8 7.2 2.4 4.9 7.4 2.5 5.1 7.5 2.4 5.2 7.6 2.4 5.4 7.6 2.2 5.5 7.9 2.4 5.6 8.1 2.5 Average rise per linear foot: .236 mg/l/ft

Mississippi State-Test 2 Date: 7/14/88 Location: Mississippi State University Flow rate: 40 GPM Head: h=1” Temperature: 23ºC Saturation @ sea Level: 8.7 PPM Time intervals of D.O. sampling: Each 30 sec.

TEST 3 Probe 1 Probe 2 O2 Rise 3.9 7.7 3.8 Average rise per linear foot: .38 mg/l/ft

Local Pool-Test 3 Date: 8/15/88 Location: Tupelo, MS Flow rate: 40 GPM Head: h=1” Temperature: 27ºC Saturation @ sea Level: 8.0 PPM Time intervals of D.O. sampling: Continuous

TEST 4 Sample Reading (PPM) Inlet 7.0 24" Downstream 7.9 48" Downstream 8.1 72" Downstream 8.2 Average rise per linear foot: .275 PPM in 4 ft.

Permanent Installation-Test 4 Date: 4/17/91 Location: Shannon, MS WWTF (Lagoon) Flow rate: 110 GPM Head: h=2.25” Temperature: 26ºC Saturation @ sea Level: 8.2 PPM Time Intervals of D.O. sampling: 60 sec./each pt. Aerator size: 12" W x 16' L w/two 6" W channels

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• Compact • Easy Installation • Versatile • No External Power • Little or No Maintenance • Extremely Affordable

This unique design offers customers a cost effective way to meet federal regulations for both existing and new treatment systems.

The patented Low-Profile Cascade Aerator is revolutionizing the post aeration marketplace.

The Smallberry system is offered in several configurations, making it extremely versatile. Unit lengths are based on average rise at 1” (h) mean average. Widths are selected based on a maximum (h) of 5”.

The next generation of post-aeration is here and your JMS sales representative is ready to assist you with your needs.

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