Scalable and environmentally sensitive algae management tech: H2O2 dosing

This project assessed the feasibility of using hydrogen peroxide (H₂O₂) as an algaecide to control cyanobacteria in the treated effluent lagoons at Melbourne Water’s Western Treatment Plant (WTP). The study built on a previous report that evaluated various oxidation options for the WTP and identified H₂O₂ as the most appropriate oxidant.

The primary objective was to determine whether H₂O₂ could effectively reduce microbial activity and the required quantities for successful treatment. The trial provided key insights, including H₂O₂ decomposition rates, appropriate dosing quantities, cyanotoxin release, and impacts on microbial diversity. Sampling focused on surface scums and water above the sludge/sediment layer.

Lab-based tests were conducted to evaluate the oxidation efficacy, with future projects to explore larger-scale trials. While H₂O₂ was found to be a feasible solution for cyanobacteria removal, the size and characteristics of the WTP ponds posed unique operational challenges for full-scale implementation.