Inventor: Mr.Tran Hong Con
Description
The invention relates to the field of water treatment and more specifically to systems for water purification to remove arsenic and possibly other heavy metals, microbes and other pollutants from drinking water and it relates to adsorbent materials based on surface activated mineral grains, methods of producing and recycling the adsorbent materials and the use of the water treatment systems. The water treatment system according to the invention comprises adsorbent material, of which at least a fraction is based on mineral grains and comprises manganese dioxide in a surface layer. The method of producing the adsorbent material for water purification according to the invention is based on calcinated mineral grains which are coated to comprise manganese dioxide on the grain surfaces
It is therefore an object of the invention to provide systems for water purification and to produce adsorbent materials for it based on mineral grains, with improved adsorption capacities for arsenic and which are recyclable to allow for save deposit of adsorbed arsenic. This object is achieved by systems for water treatment and methods of production and recycling of adsorbent material as defined in the claims. The water treatment system according to the invention comprises adsorbent material, of which at least a fraction is based on mineral grains and comprises manganese dioxide in a surface layer. Preferred methods of producing the adsorbent material for water purification according to embodiments of the invention are based on calcinated mineral grains which are treated to comprise manganese dioxide on the grain surfaces.
The mineral grains can be produced from a variety of minerals, and the described embodiments described with laterite are not limiting the invention to the use of laterite but the invention extends also to the use of other minerals such as limonite or clay etc. It is generally advantageous to use a mineral which at least after calcination has good physical stability in water and is highly porous and exhibiting a large surface area per volume and weight of adsorbing material comprising inner and outer adsorbing surfaces.
Field of invention:
The invention relates to the field of water treatment and more specifically to systems for water purification to remove arsenic and possibly other heavy metals, microbes and other pollutants from drinking water and it relates to adsorbent materials based on surface activated mineral grains, methods of producing and recycling them and to the use of the system
Source: National Office of Intellectual Property of Vietnam
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