Akuna Services recently assisted a regional council to increase the efficiency of their waste water treatment system.

You may want to call it a WWTP (Waste Water Treatment Plant), or a STP (Sewerage Treatment Plant).  Akuna Services customised long-lasting floating baffles to increase the efficiency of their waste water treatment system.  The baffles were custom-built and designed to suit the pond size and shape, constructed from heavy-duty membrane and installed in series to create channels through the pond and increase the retention time of the water.

Let’s first take a look at what a treatment pond is there for.

Without the engineering mumbo jumbo (no offence, you engineers) here we go.

In olden days waste water (raw sewage) was discharged direct into the nearest river or lagoon and the waste and solids were diluted significantly through sheer volume of the relatively clean water. Then began a process of natural purification. Organic matter and pathogens (bad guys) in the waste water are attacked and consumed by non-pathogenic bacteria (good guys), until the waste water is sufficiently purified to be no longer a threat to health. Natural UV from the sun will also assist greatly.

These days, with greater populations and heavy compliance requirements, modern waste water treatment systems are critical for regional towns for the purification of the waste water (sewerage) of their population to speed up the process of purification.

To purify the water a system may involve a primary pond (first) and a secondary pond, and it may involve screening tanks and chemical dosing at various stages of the process.

In a primary pond the suspended solids in the water are allowed to settle. The water enters through the inlet after screening, passes through the pond quite slowly to allow solids to settle, then exits through the outlet to a secondary pond or treatment plant. Natural non-pathogenic bacteria will consume the pathogens and help break down the solids – so it makes sense to retain the water in this stage as long as possible to maximise the length of time to settle.

If the water flows through the pond too fast, then the solids become more agitated and the settlement of the solids is reduced. The time for aerobic bacterial action is also shortened.  This effect is called ‘short circuiting’ the pond.

The installation of floating baffles in the pond will help create flow paths or channels through the pond and check the velocity of the flow, making the settlement of solids more effective. Baffles are impervious, floating ‘walls’ that, when installed correctly, will reach from the top of the water to the bottom of the pond and channel the water through a longer pathway between inlet and outlet. Perhaps an ‘S’ pattern. This increases the settlement time and the time for bacterial action is also increased, so the water exiting through the outlet has been treated to a greater extent.

Contact the team at Akuna Services for a custom-solution consultation.