Borehole water purification requires methods tailored to detected contaminants like bacteria, minerals, or sediments after testing. Common treatments ensure safety for drinking by removing pathogens and impurities effectively.
Primary Disinfection Methods
Chlorination kills bacteria and viruses by adding chlorine, allowing contact time for effectiveness; it's affordable but may alter taste. UV disinfection exposes water to ultraviolet light in a chamber, neutralizing microbes without chemicals—ideal for continuous use.
Ozonation injects ozone gas to oxidize contaminants, offering strong disinfection but higher setup costs.
Filtration Techniques
Reverse osmosis (RO) forces water through a semi-permeable membrane, stripping dissolved salts, heavy metals, nitrates, and 99% of impurities; combine with pre-filters for best results. Activated carbon filtration absorbs odors, chlorine, and organic compounds, improving taste post-RO.
Sediment or multimedia filters remove particles first, protecting downstream systems.
Specialized Treatments
Water softening via ion exchange removes hardness (calcium/magnesium) to prevent scaling; essential for high-TDS borehole water. Nanofiltration targets specific salts and organics as a gentler RO alternative.
For Kenya/SA contexts, RO+UV+UF combos handle microbial and mineral risks common in Nairobi aquifers.
Implementation Tips
Start with water analysis to select methods (e.g., RO for salty groundwater). Install professional systems (R10,000–R50,000) with maintenance like bulb replacement. Boiling serves as a simple backup.