Amanzimtoti Water Treatment PlantAmanzimtoti Water Treatment Plant - Umgeni Water … · ·...
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265 Amanzimtoti Water Treatment Plant Amanzimtoti Water Treatment Plant Amanzimtoti Water Treatment Plant Amanzimtoti Water Treatment Plant The Amanzimtoti WTP (Figure 5.38) receives raw water from the Nungwane Dam (Figure 5.36) which has a firm yield of 9.04 Ml/day (at a 98% assurance of supply). The design capacity of the WTP is 22 Ml/day, which is far greater than the assured yield of the water resource. Potable water is also fed into the clear wells at the WTP from Wiggins WTP via the SCA Pipeline. The characteristics of this WTP are shown in Table 5.39. Figure 5.38 Amanzimtoti Water Treatment Plant. Potable water is gravity fed from Amanzimtoti WTP along the 800 mm diameter steel South Coast Pipeline Phase 1 (SCP-1) (Table 5.40) to the Mnini Pump Station (Table 5.41) from where the water is pumped to the 7.5 Ml Quarry Reservoir (Table 5.42). eThekwini Municipality proposes to link a number of their reservoir supply zones off this section of the SCP-1. The controls at the existing Mnini Pump Station are programmed to stop the pump sets supplying the existing Quarry Reservoir when the reservoir is at 95% of Top Water Level (TWL) and start the pump sets when the reservoir is at 70% of TWL. From Quarry Reservoir, potable water is gravity fed along the 600 mm diameter steel SCP-1 (Table 5.40) and terminates at the off-take to Scottburgh South Reservoir. Ugu DM intends to link a number of their reservoir supply zones to this section of the SCP-1. Scottburgh South Reservoir currently serves as a distribution reservoir supplying Scottburgh Central and Freeland Park reservoirs (via the Freeland Park Pump Station).
Transcript of Amanzimtoti Water Treatment PlantAmanzimtoti Water Treatment Plant - Umgeni Water … · ·...
265
Amanzimtoti Water Treatment PlantAmanzimtoti Water Treatment PlantAmanzimtoti Water Treatment PlantAmanzimtoti Water Treatment Plant
The Amanzimtoti WTP (Figure 5.38) receives raw water from the Nungwane Dam (Figure 5.36) which
has a firm yield of 9.04 Ml/day (at a 98% assurance of supply). The design capacity of the WTP is
22 Ml/day, which is far greater than the assured yield of the water resource. Potable water is also
fed into the clear wells at the WTP from Wiggins WTP via the SCA Pipeline. The characteristics of this
WTP are shown in Table 5.39.
Figure 5.38 Amanzimtoti Water Treatment Plant.
Potable water is gravity fed from Amanzimtoti WTP along the 800 mm diameter steel South Coast
Pipeline Phase 1 (SCP-1) (Table 5.40) to the Mnini Pump Station (Table 5.41) from where the water
is pumped to the 7.5 Ml Quarry Reservoir (Table 5.42). eThekwini Municipality proposes to link a
number of their reservoir supply zones off this section of the SCP-1.
The controls at the existing Mnini Pump Station are programmed to stop the pump sets supplying
the existing Quarry Reservoir when the reservoir is at 95% of Top Water Level (TWL) and start the
pump sets when the reservoir is at 70% of TWL.
From Quarry Reservoir, potable water is gravity fed along the 600 mm diameter steel SCP-1
(Table 5.40) and terminates at the off-take to Scottburgh South Reservoir. Ugu DM intends to link a
number of their reservoir supply zones to this section of the SCP-1. Scottburgh South Reservoir
currently serves as a distribution reservoir supplying Scottburgh Central and Freeland Park reservoirs
(via the Freeland Park Pump Station).
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Table 5.40 Characteristics of the Amanzimtoti WTP.
WTP Name: Amanzimtoti WTP
System: South Coast System
Maximum Design Capacity: 22 Ml/day
Current Utilisation: 17.46 Ml/day
Raw Water Storage Capacity: None
Raw Water Supply Capacity: 100 Ml/day
Pre-Oxidation Type: None
Primary Water Pre-Treatment Chemical: Other
Total Coagulant Dosing Capacity: Polymeric Coagulant
Rapid Mixing Method: Flow Over Weir
Clarifier Type: Circular Mechanical Scraper Clarifier
Number of Clarifiers: 3
Total Area of all Clarifiers: 1186.5 m2
Total Capacity of Clarifiers: 11.5 Ml/day
Filter Type: Other
Number of Filters: 13
Filter Floor Type 211.25 m2
Total Filtration Area of all Filters 1.7 Ml/day
Total Filtration Design Capacity of all Filters: 5 m3
Total Capacity of Backwash Water Tanks: 2000 kg/day of thin sludge
Total Capacity of Sludge Treatment Plant: N/A
Capacity of Used Washwater System:
Primary Post Disinfection Type: Chlorine Gas
Disinfection Dosing Capacity: 500 kg/hr
Total Treated Water Storage Capacity: 24 Ml
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Craigieburn Water Treatment PlantCraigieburn Water Treatment PlantCraigieburn Water Treatment PlantCraigieburn Water Treatment Plant
The Craigieburn WTP (Figure 5.39) was “mothballed” with the commissioning of the SCP-1
(IMP 2009). Currently the clear wells at Craigieburn WTP receive potable water off the SCP-1
upstream of the Quarry Reservoir. Potable water is then pumped to the Craigieburn Reservoir
Complex. From the Craigieburn Reservoir Complex, potable water is pumped to the Midnite Café
Reservoir, from where eThekwini Municipality sells the water to Ugu DM. Potable water is also
pumped from the Craigieburn Reservoir Complex, via the Willowglen Booster Pump Station, to Ugu
DM’s Amahlangwa and Kwa Cele Reservoirs (Figure 5.36)
The 250 mm diameter pipeline that links Amahlangwa and Nkonko reservoirs serves as an
emergency supply pipeline between Craigieburn WTP and Umzinto WTP during drought periods, and
is currently used extensively (Figure 5.36).
Figure 5.39 Craigieburn Water Treatment Plant.
26
8
Ta
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270
Umzinto Water Treatment PlantUmzinto Water Treatment PlantUmzinto Water Treatment PlantUmzinto Water Treatment Plant
The Umzinto WTP receives its raw water from two sources. Water is released into the
Mzinto River from the Umzinto Dam, abstracted a few kilometres downstream through a
sand-abstraction system at Esperanza and pumped to the WTP. Otherwise, it can be pumped
to the WTP directly from the E.J. Smith Dam situated on the Mzimayi River (Figure 5.36).
The design capacity of the Umzinto WTP is 13.6 Ml/day, with provision for a fourth module,
which will bring the total capacity to 18.2 Ml/day. The supply of treated water from the
WTP is currently limited by the availability of raw water, viz. 10 Ml/day at a 98% assurance
level. The dams and the Umzinto WTP are owned by Ugu District Municipality, but are
operated by UW under a management contract. Treated water from the WTP is sold to
Ugu District Municipality “at the fence” and they are responsible for distribution within the
entire network from the Umzinto WTP. The characteristics of Umzinto WTP are shown in
Table 5.44, the pump details in Table 5.45 and the reservoirs details in Table 5.46.
Figure 5.40 Umzinto Water Treatment Plant.
Umzinto Supply SystemUmzinto Supply SystemUmzinto Supply SystemUmzinto Supply System
It is important to understand the bulk supply system from the Umzinto WTP which is owned
and operated by Ugu District Municipality (Figure 5.37), since Umgeni Water’s own
operations and future augmentation plans are integrated into this system.
Potable water is supplied from Umzinto WTP to Umzinto Heights Reservoir via the
St Patrick’s Booster Pump Station. Similarly, potable water is supplied from Umzinto WTP to
the Hazelwood and Nkonko reservoirs via the Nkonko Booster Pump Station, as well as to
the Esperanza and Ifafa reservoirs via the Ifafa Booster Pump Station.
Potable water is gravity fed from Umzinto WTP to the Ellingham Reservoir from where it is
gravity fed to the Park Rynie Reservoir.
271
Potable water is also gravity fed from Umzinto WTP along the 250 mm diameter pipeline to
the Cabana and Kelso reservoirs and onto Pennington Reservoir. Potable water is then
pumped via the Pennington Pump Station to the Umdoni Reservoir.
The 200 mm diameter pipeline along Dolphin Drive in Pennington also supplies potable
water to the Hilltops and Bazley reservoirs.
The Umzinto WTP supply area along the southern coast extends as far as Bazley Reservoir.
The 200 mm diameter link between Bazley Reservoir and Elysium Reservoir, which is
supplied from the Mtwalume WTP, is used to supplement the supply of Mtwalume WTP.
Table 5.45 Characteristics of the Umzinto WTP.
WTP Name: Umzinto WTP
System: South Coast System
Maximum Design Capacity: 12 Ml/day
Current Utilisation: 9.91 Ml/day
Raw Water Storage Capacity: 0.1295 Ml
Raw Water Supply Capacity: 12.24 Ml/day
Pre-Oxidation Type: KMnO4
Primary Water Pre-Treatment Chemical: Polymeric Coagulant
Total Coagulant Dosing Capacity: None
Rapid Mixing Method: Conventional Paddle Flash Mixer
Clarifier Type: Clari-Flocculator
Number of Clarifiers: 3
Total Area of all Clarifiers: 387 m2
Total Capacity of Clarifiers: 14 Ml/day at 1.5 m/hr upflow rate, 19 Ml/day at 2 m/hr upflow
rate
Filter Type: Constant Rate Rapid Gravity Filters
Number of Filters: 5
Filter Floor Type Monolithic
Total Filtration Area of all Filters 127 m2
Total Filtration Design Capacity of all Filters: 12 at 3.9 m/hr filtration rate, 15 Ml/day at 5 m/hr filtration rate
Total Capacity of Backwash Water Tanks: Nil
Total Capacity of Sludge Treatment Plant: Nil
Capacity of Used Washwater System: Nil
Primary Post Disinfection Type: Chlorine Gas
Disinfection Dosing Capacity: 12 kg Cl2/hr including the Stand-By Unit
Disinfectant Storage Capacity:
Total Treated Water Storage Capacity: 5 Ml
27
2
Ta
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5.4
6
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spe
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274
Mtwalume Water Treatment PlantMtwalume Water Treatment PlantMtwalume Water Treatment PlantMtwalume Water Treatment Plant
The Mtwalume WTP (Figure 5.41) receives its raw water from a sand abstraction system in
the Mtwalume River. The design capacity of Mtwalume WTP has recently been upgraded
from 4.5 Ml/day to 7.5 Ml/day. As with the Umzinto WTP, the Mtwalume WTP and bulk
water supply infrastructure is owned by Ugu District Municipality with Umgeni Water
operating the WTP under a management contract. Treated water is sold by Umgeni Water
to Ugu District Municipality “at the fence”, and Ugu District Municipality is responsible for
the entire distribution network within the Mtwalume Supply System. The characteristics of
Mtwalume WTP are described in Table 5.47, the pump details for this sub-system in Table
5.48 and the reservoirs details in Table 5.49.
Figure 5.41 Mtwalume Water Treatment Plant.
Mtwalume Supply SystemMtwalume Supply SystemMtwalume Supply SystemMtwalume Supply System
It is important to understand the bulk supply system from the Mtwalume WTP which is
owned and operated by Ugu District Municipality (Figure 5.36), since Umgeni Water’s own
operations and future augmentation plans are integrated into this system.
Potable water is supplied from Mtwalume WTP via the Mtwalume WTP Pump Station to the
Qoloqolo, Elysium and Mnafu reservoirs. Potable water is then gravity fed from the
Mnafu Reservoir to the Mathulini Reservoir.
Potable water is gravity fed from the Elysium Reservoir to the Mtwalume Reservoir and then
the water is pumped via the Mtwalume Pump Station to the Koelwaters Reservoir.
275
Table 5.48 Characteristics of the Mtwalume WTP.
WTP Name: Mtwalume WTP
System: Mtwalume WTP Supply System
Maximum Design Capacity: 7.5 Ml/day
Current Utilisation: 9.65 Ml/day
Raw Water Storage Capacity: 0.11Ml/day
Raw Water Supply Capacity: 8.4 Ml/day
Pre-Oxidation Type: Prechlorination
Primary Water Pre-Treatment Chemical: Polymeric Coagulant
Total Coagulant Dosing Capacity: Other
Rapid Mixing Method: Conventional Paddle Flash Mixer
Clarifier Type: Dortmund Type Clarifier
Number of Clarifiers: 3
Total Area of all Clarifiers: 324 m2
Total Capacity of Clarifiers: 16 at Rise Rate of 2m/hr
Filter Type: Constant Rate Rapid Gravity Filters
Number of Filters: 3
Total Filtration Area of all Filters 72 m2
Total Filtration Design Capacity of all Filters: 15.552 Ml/day
Primary Post Disinfection Type: Chlorine Gas
Disinfection Dosing Capacity: 8 kg Cl2/hr
Total Treated Water Storage Capacity: 9 Ml
27
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