Coagulation

Our engineered chemical tanks are completely compatible for on-line storage of the coagulant chemicals Aluminium Sulphate (Alum), Ferric sulphate and Ferric Chloride. These can be supplied both for large-scale operations and for smaller, mine-site based systems. For the latter, the tanks can be designed to be seismic resistant for location in the vicinity of blasting.

Flocculation

Flocculation processes in Australia vary widely but Islex has developed several designs based on thermoplastics. For agitation Islex can supply tanks up to 5m by 5m in diameter, fully constructed from HDPE. Importantly, these tanks can be custom sized and purpose designed to allow the water treatment professional to size the structure to provide the optimum velocity gradient.

Clarification

Clarification systems vary from large, concrete structures supplying large municipalities to smaller systems designed for small communities such as mine sites.

Typically the larger systems such as the solids contact clarifiers are susceptible to concrete cancer and leakage. To resolve this problem clarifiers can be lined with HDPE. All piping and fittings can be fully welded utilising the same technology perfected by the Islex-Merit group over the past twenty years.

Smaller clarifiers can be constructed utilising a unique composite construction of steel reinforced HDPE (see picture). Because these structures cab be built in modular form they are particularly suited to remote locations where on-site construction costs are high.

Flotation

Since the 1990’s direct air flotation (DAF) has become a popular form of clarification. Like the water industry itself, Islex first gained their experience in flotation systems from the mining industry where they have built flotation towers up to 10m tall.

Depending on their size, DAF units can be constructed completely out of thermoplastic.

Chemical dosing

The chemicals Sodium Hypochlorite and Hydroflourosilicic acid are frequently utilized in Australia in the treatment of water. Both chemicals are corrosive and create significant maintenance problems when steel tanks are utilized. Islex has significant experience in building these dosing stations with High density polyethylene tanks, secondary containment barriers and associated piping.