Continuous Aeration Plant (CAP)

A Continuous Aeration Plant (CAP), is designed to provide full treatment to crude sewage in a normal domestic environment. The CAP teats sewage to a higher standard than a septic tank, but does no offer the same degree of control available from a Sequential Batch Reactor (SBR) The standard of effluent discharged from a CAP is such that it does not need to be passed through a soak away and can be discharged directly to a watercourse.
The Sequential Batch Reactor (SBR) has proven, beyond doubt, to provide the highest standards of effluent quality in the market-place. The CAP, while not designed to rival the SBR in terms of effluent quality, offers an efficient, economic and environmentally friendly alternative to either septic tanks or premium sewage treatment plant.
Benefits and features

• Impact resistant body moulded in one-piece polyethylene

• Wide base for stability, ease of handling and storage

• Moulding-in lifting eyes

• Achieves Royal Commission standards for effluent quality under normal domestic conditions

• Powered by small, silent air compressor

• No electrics in tank

• Fully recyclable material

• Corrosion resistant

Technical information

The CAP is a biological aeration type treatment plant designed to produce a moderate quality of final effluent in addition to overcoming several of the common problems associated with small packaged domestic sewage treatment units.
Common problems which can occur are:

• "Fixed film" types, which have a "media" matrix can suffer from media blockage because of excessive bacteria growth. Replacement/maintenance of the media material may be required at regular intervals.

• Mechanical/electrical components within the tanks are difficult to maintain and can be a safety risk

• The liquor is not spread evenly over the available bacteria preventing an adequate oxygen supply.

The CAP’s overcomes these problems because:

• There is on "fixed" media within the CAP to become blocked up - it operates in the "activated sludge" principal whereby the bacteria floats in suspension in the reactor vessel and forms an "active soup" of "mixed liquor"

• There are no moving parts or electrical components within all the tanks. All the functions within the tanks are operated by air power generated by a small compressor housed in a remote chamber, allowing maintenance to be carried out safely and easily.

• The bacterium receives a high quality air supply and is completely mixed and aerated by the high volume fine bubble diffuser.