GB GB2563202A
A portable water treatment device comprises a photovoltaic panel (A), an input water storage tank, a filtration unit (D), and a UV irradiation unit. The UV irradiation unit is powered by the photovoltaic panel. Water is gravity fed from the input storage tank to the filtration unit and from the filtration unit to the UV irradiation unit. Optionally, water is gravity fed from the UV irradiation unit to an output water storage tank (H). Preferably, the filtration unit comprises a helical spring filter having an exclusion size of less than 40 microns. An array of UV LEDs may be utilised to suppress microbial growth in the output storage tank. The filtration unit and UV irradiation unit can be provided in drawers to facilitate removal from the device for cleaning, servicing or replacement. A photocatalyst, such as titania, may be utilised in the UV irradiation unit to generate free radicals in the presence of UV irradiation. The device may also comprise a rechargeable battery, which is charged by the photovoltaic panel when sufficient light is available, and which can power the UV irradiation unit when the unit is operational.
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