Monitoring of groundwater recharge basin performance at Kwinana
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The performance of a recharge basin at the Kwinana Groundwater Recharge Site has been monitored since 1983. A primary aim of the monitoring programme is to study the improvement in the removal of faecal coliform (FC) and nutrients (nitrogen and phosphorus) by amending the sand of the recharge basin with gypsum neutralized red mud (RMG).
The present report details the results of the monitoring programme from August 1985 to September 1986, consisting of 3 operating stages: Stage 1. Flooding (9d) and drying,(12d) of the basin using primary effluent (August 85 to March 86); Stage 2. Flooding (9d) and drying (12d) of the basin with a mixture of 2/3 secondary and 1/3 primary effluent (April to July 86); and Stage 3. Continuous flooding with primary effluent (August to September 86).
Phosphorus removal was maintained at a high level (over 80%) in all the stages. FC removal was generally excellent (over a million fold reduction), except at the beginning of each stage when primary effluent was used and only a thousand fold reduction was achieved. Removal, however, improved with time and a million fold reduction was achieved.
Nitrogen removal of about 40% was obtained with primary effluent using a cycle of flooding and drying (Stage 1). Continuous flooding with primary effluent (Stage 3) did not improve denitrification. No nitrogen removal was observed with a mixture of 2/3 secondary effluent and 1/3 primary effluent.
It is recommended based on the above results that further monitoring be conducted using primary effluent to optimise nitrogen removal by adjusting the lengths of the floodin9 and drying periods.
|Murdoch Affiliation:||School of Environmental Science|
|Publisher:||Environmental Science, Murdoch University|
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