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1 Advanced wastewater treatment in these plants follows high rate secondary treatment and includes addition of chemical coagulants (alum + polymer) as necessary followed by filtration through sand or activated carbon granular medium filters.. Source: Asano and Tchobanoglous (1987) iv. To provide additional treatment. Oxygen demand, suspended solids, nitrogen, and microorganisms are further
Governments began to mandate waste treatment. Before the First World War led to the interruption of installation of wastewater treatment facilities, they were constructed in the main cities of Europe (Seeger, 1999, Cooper, 2007). However political ideology interfered with wastewater management in some countries.