(Source: EUROSTAT, 2022)
This data demonstrates that, in different nations how much sludge was produced after the wastewater treatment and undoubtedly it shows that various national governments are concerned about the water management and environment, but sludge disposal data is also parallelly important. Based on the statistical data of Eurostat (2019), the worldwide disposal of sewage sludge using different disposal methods, is shown in Table 2 and Figure 2.