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Tracer studies on an aerated lagoon.

Alistair Broughton¹, Andy Shilton

¹CPG New Zealand Ltd, Private Bag 562, Palmerston North, New Zealand.

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|January 27, 2012

Summary

Aerated lagoons in Palmerston North showed significant dead space due to sludge accumulation, impacting hydraulic efficiency. Optimisation efforts revealed limited benefits from structural changes like baffles.

Area of Science:

Environmental Engineering
Water Treatment Technologies
Fluid Dynamics

Background:

Palmerston North utilizes two aerated lagoons for secondary wastewater treatment.
Investigation into treatment efficiency prompted a hydraulic study of the second lagoon.

Purpose of the Study:

To investigate the hydraulics of an aerated lagoon to assess optimisation potential.
To determine the impact of sludge accumulation on lagoon performance.

Main Methods:

Conducted a tracer study using rhodamine WT to analyse stimulus-response.
Collected samples at 24 points to map tracer concentration profiles.
Performed a sludge survey to quantify volume occupied by sludge.

Main Results:

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Determined a mean residence time of 39.9 h against a theoretical 55.4 h.
Identified 28% of lagoon volume as dead space, correlating with 26% sludge fill.
Observed effective influent mixing at the inlet zone with no significant short-circuiting.

Conclusions:

Sludge accumulation is a primary factor reducing hydraulic efficiency in the aerated lagoon.
The lagoon's hydraulic performance is comparable to baffled systems, suggesting minimal gains from adding baffles.
Tracer distribution profiles offer valuable insights into pond hydraulics and transport mechanisms.