A domestic sewage treatment facility processing 9 million litres per day, with an initial pH of 6.9, biochemical oxygen demand (BOD) of 700 mg/L, chemical oxygen demand (COD) of 1252 mg/L, and turbidity of 320 NTU, trialled Tanfloc at a dosage of 150 ppm. The treatment achieved 95% BOD removal, 94% COD removal, and 97% turbidity removal. Compared to baseline performance, these results represented increased removal efficiencies of 24% for BOD, 23% for COD, and 57% for turbidity.
The process generated biodegradable sludge suitable for unrestricted agricultural application or use as fertiliser following pathogen stabilisation. The final effluent exhibited a pH of approximately 7.0, eliminating the need for pH correction prior to discharge. Operational improvements included simplified dosing with a single product, reduced labour complexity, and a significant reduction in equipment and pipe corrosion typically associated with iron chloride.
Additionally, operator health and safety were enhanced by using a product not classified as hazardous under UN regulations.
