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1. Introduction. Biological wastewater treatment is widely used in the world, but large amounts of waste activated sludge (WAS) are produced, which is a big problem faced by wastewater treatment plants (WWTPs) nowadays (Chen et al., 2016, Wang et al., 2012, Wang et al., 2017a, Zhao et al., 2016a, Zhao et al., 2017b).WAS would readily cause secondary pollution if it is treated and disposed