Progress being made on wastewater treatment plant

October 24th, 2015
[from TDC newsletter]

An upgrade of the Motueka wastewater treatment plant is advancing with the second of three stages for this year completed.

This past winter Taylors Contracting trucks have made more than 500 trips, dumping more than 7500 cubic metres of rock for the construction of two rock bunds extending across the 225-metre wide oxidation pond.

These rock bunds will increase the pond retention time, which is the amount of time the wastewater takes to flow through the pond from inlet to outlet.

By splitting the pond into three, the wastewater is forced to follow the longest path through the ponds. This improves the treatment of the wastewater by increasing the ultra-violet (UV) treatment time.

In a later stage, a spray system will be laid on top of the rock bunds through which recirculated wastewater will be sprayed as an odourless fine mist on to the bunds. This generates a nitrification process which improves removal of ammonia from the wastewater.

Stage three is the improvement to aeration, reducing the odour of the intake ponds. Eight new, larger aerators will be added to the ponds. Construction and installation of the new aerators began in September.

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