Green Drop System (GDS)

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Distribution of Wastewater Works

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Distribution of Wastewater Works
(Show footnote)
Wastewater services delivery is performed by a vast number of Water Services Authorities and their Providers in South Africa. The Green Drop Certification programme of 2010/11 verified the status of wastewater service delivery by hundred and fifty-six (156) municipalities that provide services via an infrastructure network comprising of 821 wastewater collector and treatment systems. The Green Drop assessment results verified a spread of treatment plants across the country to comprise predominantly (73%) of micro-, small- and medium sized plants. Sixty-seven percent (67%) of design capacity is contained at macro-size plants, which are mostly located in the larger cities.

 

South Africa: Works Distribution

ProvinceWastewater WorksDesign CapacityDaily FlowRemaining Capacity (%)
Number% of TotalMl/day% of Total Ml/day % of Total
EC 123 14.98% 489.5 7.40 344.9 6.56 29.54%  
FS 95 11.57% 482.2 7.29 197.9 3.76 58.96%  
GT 56 6.82% 2 595.1 39.24 2 579.0 49.05 0.62%  
KZ 143 17.42% 1 076.2 16.27 715.9 13.61 33.48%  
LP 67 8.16% 150.4 2.27 123.2 2.34 18.09%  
MP 76 9.26% 323.1 4.89 159.1 3.03 50.76%  
NC 71 8.65% 150.3 2.27 93.3 1.77 37.92%  
NW 35 4.26% 315.8 4.77 143.8 2.73 54.46%  
WC 155 18.88% 1 031.4 15.59 901.2 17.14 12.62%  
SA 821 100.00% 6 614.0 100.00 5 258.3 100.00 20.50%  


Design Capacity and Operational Flow Distribution
(Show footnote)
A total flow of 5258 Ml/day is received at the 821 treatment facilities, which has a collective hydraulic design capacity of 6614 Ml/day (as ADWF). This means that 80% of the design capacity is taken up by the current operational flows, leaving 20% to meet the future demand without creating new capacity.

However, the findings of the Green Drop assessment suggest that a significant portion of this existing ‘surplus capacity’ might not be readily available, as result of inadequate maintenance and operational deficiencies, especially at lower capacity municipalities.

The opposite scenario is also possible at high capacity municipalities, where infrastructure can usually cope with flows that exceed the theoretical design capacity without compromising the final effluent capacity. This attainment is however, dependant on qualified and experienced plant management and scientific services.

Analysis of the operational flows indicate that Gauteng manages the bulk of the national load which account for 49%, followed by 17% in the Western Cape and 14% in Kwa-Zulu Natal. The balance of the provinces receives and treats the remainder 20% of wastewater generated in South Africa.

Distribution of WWTPs per Size Category

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FusionChart Export Handler Component
Micro: <0.5 Ml/daySmall: 0.5 - <2 Ml/dayMedium: 2 - <10 Ml/dayLarge: 10 - <25 Ml/dayMacro: 25+ Ml/dayUndetermined: ? Ml/day

Distribution of WWTPs per Size Category
(Show footnote)
The Green Drop assessment results verified a spread of treatment plants across the country to comprise predominantly (73%) of micro-, small- and medium sized plants. Sixty-seven percent (67%) of design capacity is contained at macro-size plants, which are mostly located in the larger cities.

 

Design Capacity Distribution

Score Chart
FusionChart Export Handler Component
Micro: <0.5 Ml/daySmall: 0.5 - <2 Ml/dayMedium: 2 - <10 Ml/dayLarge: 10 - <25 Ml/dayMacro: 25+ Ml/dayUndetermined: ? Ml/day

Design Capacity Distribution
(Show footnote)
A total flow of 5258 Ml/day is received at the 821 treatment facilities, which has a collective hydraulic design capacity of 6614 Ml/day (as ADWF). This means that 80% of the design capacity is taken up by the current operational flows, leaving 20% to meet the future demand without creating new capacity.

However, the findings of the Green Drop assessment suggest that a significant portion of this existing ‘surplus capacity’ might not be readily available, as result of inadequate maintenance and operational deficiencies, especially at lower capacity municipalities.

The opposite scenario is also possible at high capacity municipalities, where infrastructure can usually cope with flows that exceed the theoretical design capacity without compromising the final effluent capacity. This attainment is however, dependant on qualified and experienced plant management and scientific services.

 

Operational Flow Distribution

Score Chart
FusionChart Export Handler Component
Micro: <0.5 Ml/daySmall: 0.5 - <2 Ml/dayMedium: 2 - <10 Ml/dayLarge: 10 - <25 Ml/dayMacro: 25+ Ml/dayUndetermined: ? Ml/day

Operational Flow Distribution
(Show footnote)
Analysis of the operational flows indicate that Gauteng manages the bulk of the national load which account for 49%, followed by 17% in the Western Cape and 14% in Kwa-Zulu Natal. The balance of the provinces receives and treats the remainder 20% of wastewater generated in South Africa.




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