CASE STUDY
Borehole Water Treatment for The Grange Residential Development
A multi-stage borehole water treatment project in Harare, Zimbabwe, designed to provide a reliable potable water supply.
LOCATION
Harare, Zimbabwe
INDUSTRY
Residential Development
PLANT CAPACITY
1 × 270 KLPD + 2 × 180 KLPD
FINAL WATER USE
Potable Water
PROJECT OVERVIEW
Creating a dependable potable water source from borehole water
The Grange residential development required a reliable and sustainable potable water supply. Borehole water was available as a key source, but the raw water presented quality concerns that needed to be addressed before potable use.
SewTreat proposed a comprehensive borehole water treatment solution using oxidation, AFM filtration, GAC filtration and final disinfection to address the identified water quality concerns and provide a reliable source of treated potable water.
Water Treatment Overview
WATER SOURCE
Borehole Water
KEY CONCERNS
Manganese, TSS, turbidity and bacteria
TREATMENT APPROACH
Oxidation + AFM + GAC + disinfection
FINAL APPLICATION
Potable Water
THE CHALLENGE
Raw borehole water required treatment before potable use
The Grange residential development required a reliable and sustainable potable water supply. Borehole water was available as a key source, but the raw water presented quality concerns that needed to be addressed before potable use.
The primary treatment concerns identified were:
These are the specific issues SewTreat supplied for this project.
Raw Borehole Water
Key Treatment Concerns
Manganese
Target contaminant in the raw borehole water
TSS
Total Suspended Solids
Turbidity
Water clarity / NTU concern
Microbiological
Coliforms & bacteria
Harare, Zimbabwe | Final Use: Potable Water
The Grange Treatment Train
Four Stage Treatment Process
01
Oxidation
Assists in addressing manganese
↓
02
AFM Filtration
Targets suspended solids and turbidity
↓
03
GAC Filtration
Improves colour and taste
↓
04
Final Disinfection
Addresses coliforms and bacteria
1 × 270 KLPD
Plant
2 × 180 KLPD
Plants
Potable Water
Final Use
SEWTREAT’S SOLUTION
A multi-stage borehole water treatment solution
SewTreat proposed three borehole water treatment plants for The Grange: one 270 KLPD treatment plant and two 180 KLPD treatment plants.
The treatment solution incorporates oxidation, AFM filtration, GAC filtration and final disinfection. Together, these treatment stages address the key water-quality concerns identified in the borehole water and provide a reliable source of treated potable water.
TREATMENT PROCESS
How the borehole water treatment process works
Four treatment stages work together to address the key water-quality concerns identified in the raw borehole water.
01
Oxidation
Assists in addressing manganese present in the raw borehole water.
02
AFM Filtration
Removes suspended solids and reduces turbidity, improving the physical quality and clarity of the water.
03
GAC Filtration
Provides an additional treatment stage to improve the colour and taste of the treated water.
04
Final Disinfection
Addresses microbiological contaminants such as coliforms and bacteria before the water is supplied for potable use.
PLANT BENEFITS
A reliable and sustainable potable water supply
The treatment solution provides The Grange with a dependable potable water source while addressing the key physical and microbiological water-quality concerns.
01
Reliable Potable Water Supply
Provides a dependable source of treated potable water for the residential development.
02
Targeted Water Treatment
Addresses manganese, total suspended solids and turbidity identified in the raw borehole water.
03
Microbiological Control
Final disinfection addresses coliforms and bacteria before potable use.
04
Consistent Water Quality
Multiple treatment stages work together to support consistent treated-water quality.
05
Sustainable Borehole Use
Allows the development to make effective use of its available borehole water resource.
Talk To Sewtreat
Need a reliable borehole water supply?
Speak to SewTreat’s water engineers about a treatment solution designed around your water quality, required capacity and intended final use.