Sludge Treatment and Disposal 2. Background The percentage of the population served by sewage waste water treatment facilities varies considerably among the countries of the EU. The differences among thirteen member countries of the Organisation for Economic Co-operation and Development (OECD) are illustrated in figure 2.1.
This allows the use of natural wastewater treatment systems that are cheap and require low technological level. Normative aspects . In Italy the EU Directive 271/1991 about water quality was transformed into the Legislative Decree 152/1999. Tables containing emissions limits for water streams, which flow to superficial water body, are contained
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