S. Janse van Rensburg, S. Barnard, and M. Krüger, “The feasibility of wastewater recycling that includes residue from dissolved air flotation within a drinking water treatment plant: case study of Midvaal Water Company, South Africa”, WSA, vol. 45, no. 3 July, Jul. 2019, doi: 10.17159/wsa/2019.v45.i3.6732.