Diffuser Aeration Systems
Diffuser based aeration systems are a proven and effective approach for mixing waterbodies and raising dissolved oxygen concentrations.
Each diffuser effectively acts as an airlift pump entraining water from throughout the water column within the rising bubble plume, which then spreads across the surface where it is oxygenated by the atmosphere before heading back towards the bed and diffuser.
Aeration / mixing systems are used to:
Combat problems associated with stagnation and odour generation
Control of duckweed in canals
Reducing ice formation in the winter
Potential reduction of nutrient and pollutant mobilisation from sediment
Consolidation of sediments through breakdown of its organic components
Increasing the diversity of benthic aquatic invertebrate fauna
Prevent fish kills.
Diffuser Aeration Systems
Traditional diffuser-based systems are designed around individual airlines feeding each diffuser, requiring deployment of multiple airlines with the airflow to each diffuser unit manually balanced via a bankside manifold. As such, traditional system are difficult to implement successfully on linear waterbodies and require long lengths of multiple airlines to be deployed and balancing of the airflow across multiple diffuser over extended distances which is extremely problematic.
ISS-Flowthrough are able to offer a unique aeration system through use of a patented air flow regulation process that allows a large number of diffusers to be operated from a single narrow
This regulation ensures the correct optimal volume of air is delivered to each diffuser within the waterbody regardless of its position or depth.
The ISS-Flowthrough systems are effectively self balancing and simple to operate and maintain.
ISS – Flowthrough systems have been installed in a number of lakes, river and docks in both the UK and Overseas. This has included city centre locations and given the development of a resilient system design, to date none of these systems have been subject to problems with vandalism or presented interference with amenity uses.
Water mixing, has been proven as a technique for ameliorating the development of blue-green algae blooms. Most of the scientific studies on this technique for control of blue-green algae
have focused on deep water supply reservoirs where depths are greater than 10m where successful result have been achieved. However, there is an increasing body of anecdotal and
monitoring evidence suggesting that positive benefits in blue-green algae control can be achieved in shallower lakes if a relatively vigorous mixing regime is pursued.
Diffuser based systems operate by creating columns of air rising from the diffusers to the lake surface which act as air lifts drawing poor quality water from the bed and exposing it to the
atmosphere where it is oxygenated. Circulation cells develop around each diffuser which is known as primary mixing sphere and is a function of water depth. The primary mixing cell is a
radial distance of 5 to 7 times the water so deeper waterbodies require less diffusers to mix the waterbody. Secondary circulation currents develop between the primary mixing areas such that
the entire water is mixed.
Mixing of a lake tends to impact on blue-green algae bloom development in three key ways:
Increasing dissolved oxygen concentrations in the lower water column helping with reducing internal nutrient loadings;
Mixes the algae down to depth on deeper lakes where they become light limited. A similar effect may be achieved on a shallower lake through combining mixing with the use of lake dye.
A vigorous mixing regime disrupts the development of a bloom which seem to favour still water conditions.
There are further benefits to be gained from lake mixing that include oxidation of organic material leading to consolidation of sediments, increase habitat availability by raising dissolved oxygen concentrations in areas of the lake bed where there are depressed oxygen levels, reducing the concentration of bathing water bacteria by increasing exposure to UV radiation, preventing odour and ice formation.
The ISS Flowthrough systems are robust with a low maintenance requirement but do have an operational cost in terms of electricity supply and ongoing periodic maintenance
ISS -Flowthrough Bubble Barrier Systems
Bubble curtains have a wide range of applications in the management of waterbodies that include
Forming barriers and providing collection for floating litter and debris
Providing barriers to reduce fish entrainment at water abstraction points
Preventing sediment movement and accumulation in off -channel areas such as marinas
Prevent saline intrusion into freshwater
Used to prevent ice -formation
An acoustic barrier for underwater noise during piling operations
ISS-Flowthrough can offer a unique bespoke bubble barrier solution including a design individual requirements of each site and application , supply, installation and maintenance service.
We have a patented airflow regulation process that allows many diffusers to be operated from a single narrow bore airline. This ensures that the correct volume of air is delivered to each diffuser regardless of its position within an array or the water depth.
As such, the ISS-Flowthrough systems are effectively self-balancing thus simple to operate and maintain.
The effectiveness of bubble screens are influenced by both water depth and in-channel flow due to deflection of bubbles as they rise through the water column. As parameters increase, a more vigorous system is required to ensure that an effective barrier is created.
The flexibility in design of the ISS-Flowthrough system effectively allows high volume output bubble barriers to be developed, if required, to meet demanding situations that just cannot be met by the standard perforated pipe / hose approach.