A water distillation system including a reservoir unit configured to reserve a second liquid of higher concentration than the first liquid; a pipe including a first end communicated with the first liquid and a second end communicated with the second liquid in the reservoir unit; a semipermeable membrane fitted on the pipe to separate the first liquid and the second liquid, so that the first liquid is mixed into the second liquid through the semipermeable membrane and led to the reservoir unit by osmotic action; and a distillation unit configured to distill the second liquid in the reservoir unit by solar energy.

A very low pressure and entirely mechanical sea water desalination device is described, which may be built and operated at a fraction of the current costs for the desalination of sea water. The desalination device is used to purify polluted or otherwise impure water and is a device is easily scaled and can be used in a very small facilities up to the largest facilities for desalinating or purifying water. The device operates with sunlight and ambient heat, and therefore will be very inexpensive to operate in desert and tropical regions; and slightly more expensive to operate in cooler regions, yet still substantially less expensive than the existing systems. The device reduces the cost of potable water made from sea water or other polluted sources to a level which is comparable to or less than the cost of such water received from traditional local fresh-water sources.

A tent or covering with a pyramid-shaped structure, with an inner dark-colored sheet and an outer transparent sheet, installed on a supporting base anchored to the ground or on floats on the surface of the sea, wherein in the apex of the pyramid there are included vaporizers with micronebulizers for nebulizing the water to be treated, a device for capturing humid air through a continuous or sectioned condensation column and for subsoil distillation and heat dissipation in the smaller, water-collecting tank and recirculation of the air devoid of humidity into the enclosure. In addition, it includes a computerized control system of the processes includes controls of the air and nebulized water flow rates and of the working regime of the facility.

A potable water recovery system that can purify all manner of salt water or other contaminated water sources and be highly portable and inexpensive to manufacture and maintain. In some embodiments, the portable water recovery system can be disassembled for storage or transport. Additionally, the dissembled portable water recovery system can be easily packed in a small volume and transported in a backpack.

A floatable interfacial solar-driven evaporation structure includes a water impervious thermal insulation layer adapted to float on a body of water, a porous absorber layer on the water impervious thermal insulation layer, and an interlocked non-woven cotton fiber layer having a portion thereof between the water impervious insulation layer and the porous absorber layer and one or more additional portions configured to extend to the body of water to act as a capillary-driven pump to transport water from the body of water to the porous absorber layer. An ultra-black photothermal paint covers the exposed upper surface of the porous absorber layer to convert solar radiation impinging on the ultra-black photothermal paint into heat for use in generating water vapor from water in the porous absorber layer.

An apparatus for covering a water container having an open top and treating a source water therein. The apparatus has one or more dividing walls mountable to an interior space of the water container for partitioning it into multiple water-treatment zones, and a cover mountable to at least a portion of the open top of the water container above the one or more dividing walls. Each dividing wall has or forms one or more openings for directing the source water from one water-treatment zone to the next. The cover has one or more vaulted cover sections each defining a gas chamber above the dividing walls. Each cover section has a condensation surface in the corresponding gas chamber for condensing a steam evaporated from the source water to clean water, and at least one water-collection channel coupled to at least one side of the condensation surface for collecting the condensed clean water.