Page 81 - U4SSC Collection Methodology for Key Performance Indicators for Smart Sustainable Cities
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Collection Methodology for Key Performance Indicators for Smart Sustainable Cities



             Dimension           Environment
             Sub-Dimension       Environment
             Category            Water and Sanitation
             KPI Name            Wastewater Treatment
             KPI No.             EN: EN: WS: 4C   Type:          Core           Type:          Sustainable

             Definition /        Percentage of wastewater receiving treatment (Primary, Secondary, Tertiary)
             Description

             Rationale /         Improvement of water treatment reduces the incidence of a variety of waterborne
             Interpretation /    diseases. A reliable wastewater treatment system is a major indicator of the level of
             Benchmarking        local development and of community health. Water pollution from human waste is
                                 less of a problem in countries that can afford to treat sewage and wastewater.
                                 Water pollution can be minimized with adequate investment in treatment systems.
                                 The percentage of wastewater treated is an indicator of water quality management.
                                 All forms of treatment include treatment to permit water release into water
                                 resources of different levels of environmental sensitivity. They are:
                                 (i)  Primary treatment which screen and sediment sewage to remove grosser debris;
                                 (ii)  Secondary  treatment  which  reduce  Biological  Oxygen  Demand  (BOD10)  to
                                    acceptable levels by microbial oxidation using activated sludge or a trickle filter;
                                    and
                                 (iii) Tertiary treatment which reduces BOD still further through micro straining or
                                    filtering,  the  microbial  removal  of  phosphates  and  nitrates,  and  disinfection
                                    using chlorine or ozone.
                                 An improving trend and higher values are considered positive.

             Source              FAO, Wastewater Treatment. Retrieved from:
                                 http://www.fao.org/docrep/t0551e/t0551e05.htm

             Methodology         Calculate as:
                                 Numerator: Total amount of wastewater that has undergone (primary /secondary /
                                 tertiary) treatment (ℓ).
                                 Denominator: Total amount of wastewater collected (ℓ).
                                 Multiply by 100
             Unit                Percentage

             Data Sources /      This information is usually known by municipal authorities and is available from the
             Relevant            main water supply and treatment companies.
             Databases
             SDG Reference(s)    SDG indicator 6.3.1: Percentage of wastewater safely treated.























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