In this study, two phages, P69 and KYD2, were isolated from a water
sample of the fishing ground. The host of P69 was
Nocardia transvalensis, whereas the host of KYD2 was Nocardia carnea.
Physiological characteristics and bioinformatics analysis of the
isolated phages were performed. The SBR tank was simulated in the
laboratory and N. carnea was added for aeration foaming. The feasibility
of using phages to control sludge foaming was assessed by measuring
turbidity and other water quality indices before and after adding phages
and monitoring the changes in the number of hosts and phages in the
device by qPCR and other technologies. Using multiple water quality
indicators, qPCR, ecological community and other data to prove that P69
has a certain ability to control the sludge foaming event caused by the
over-proliferation of N. carnea in the environment. It provides a novel
and relatively economical solution for controlling sludge foaming in
sewage treatment plants in the future.