Liquid / Solid Seperation

A combination of advanced clarification technology provides Swan’s clients with the benefit of exceptionally efficient preconditioning and floc formulation, followed by liquids/solids separation at matching efficiency in an overall arrangement that ensures a high rate of performance, with exceptional ease of operational control and unrivalled economy in operation.

Sludge blanket vertical upflow clarifiers

These are designed for use on waters that produce a light floc which is trapped by the blanket that prevents it from being carried over to the filters. Sludge blanket vertical upflow clarifiers have an inverted cone within the clarifier. Inside the cone is a zone of rapid mixing and a zone of high solids concentration. The coagulant is added either in the rapid mix zone or somewhere upstream of the clarifier. In producing water suitable for filtration, sludge is deposited on the tank floor, and must be removed. The hydraulic drive system moves it to a hopper where it is withdrawn periodically.

Diminishing intensity floc conditioners

The Moore Type B diminishing intensity conditioning (DIC) system conditions and flocculates chemically treated raw water by means of rotating blades that co-operate with fixed conditioning vanes – a recognised method of providing efficient conditioning. With the Moore DIC however, the chemically treated water enters at the periphery of the tank, where the rotary blades have their maximum speed, and consequently impart an initial vigorous intense conditioning action that progressively diminishes in intensity as the flow progresses radially towards the centre of the tank.

The final action is very gentle, preserving the growth of even the largest and most fragile floc particles that have resulted. The fully conditioned and flocculated raw water is collected at the centre outlet and delivered without turbulence to the liquid solids separation or settling stage. This flocculated conditioned liquid is then in an ideal state for the liquid solids separation or the settling out of the turbidity laden floc particles at maximum efficiency.

Half bridge clarifiers

The primary function of a half bridge clarifier is to sweep the sludge on the floor into a hopper, where it is drawn periodically. It is a peripherally driven mechanism that requires a static support in the centre of the tank. A bearing located on the top of the static support allows the rotation of the complete bridge that spans from the tank centre to the walls.

Incline sheet clarifiers (ISC)

The Moore inclined sheet settling system boasts distinct advantages over its competitors. In most types of inclined settling systems, the inclination of the tube is fixed and cannot be adjusted in operation, whereas in the Moore inclined sheet settling system, the inclination of the sheets can be adjusted, and therefore incidentally the settling distance. In the Moore inclined sheet settling system, the sheets can at any time be swung to a vertical configuration which, together with the movement, discharges any particles tending to adhere to the sheets.

Inclined plate systems tend to be costly in relation to output, due to the cost of the plate and its mounting. The Moore inclined sheet settling system design is based on the utilisation of black polythene sheets with a mounting of stainless steel rods and corrosion resistant materials. This corrosion resistant construction is more economic than systems embodying rigid sheets. The mechanised floor sweeping systems available with Moore inclined sheets settling system are all simple, trouble free and effective in the removal of settled material. All systems constantly sweep the full length of the basin floor.

Moore Type 3 desludging system

This system consists of a reciprocating floor sweeping suction trolley that lifts settled material from the floor of the settling tank and delivers this via flexible hose, hydrostatic head and automatic valve into a sludge drain outside the tank. The trolley is motivated by a surface mounted reduction gear driving an endless rope system and may also incorporate scum skimming and removal. The system is based on automatic periodic activation and, depending on sludge accumulation, the trolley drive and desludge valve can be activated simultaneously.

Dissolved air flotation (DAF)

DAF is a process used when the solids that need to be removed are very light and do not settle readily. These are removed by dissolving air in the water under pressure, before releasing it at atmospheric pressure in a flotation tank or basin. This forms micro bubbles that attach to the floc particles, which float to the surface where a cake is formed and periodically removed.

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