A device and method for removing hardness in drinking water

Abstract

The invention discloses a device for removing the hardness in drinking water, which comprises a hydraulic chemical proportioner, a quartz-sand filtering column, a wood activated-carbon filtering column and an ultrafiltration membrane, wherein the quartz-sand filtering column, the wood activated-carbon filtering column and the ultrafiltration membrane are sequentially connected in series with a water outlet of the hydraulic chemical proportioner. The invention also discloses a method for removing the hardness in the drinking water, wherein a ferric-trichloride flocculating agent is added into the drinking water by utilizing the hydraulic chemical proportioner, the water pressure of tap water is used as power without electricity utilization, calcium ions in the water can be directly adsorbed on the surface of an oxide through the flocculating action of ferric trichloride, and a ligand can also be formed by combining functional groups of adsorbed organic-substance molecules and organic substances; and the flocculated water is then further adsorbed and filtered through quartz sand and activated carbon, the adsorption for the calcium ions is enhanced, and then colloidal substances which are generated through the filtration of the ultrafiltration membrane are discharged form the water to obtain the clear low-hardness drinking water. The removing rate of the hardness reaches more than 80 percent, and the device is simple and convenient to operate, has low cost and is applicable to the processing of home-terminal drinking water.

Description

technical field [0001] The invention relates to the field of deep purification of drinking water, in particular to a device and method for removing hardness in drinking water. Background technique [0002] Hardness is an important indicator of water quality testing. Due to geographical conditions and environmental pollution, water in many places has high hardness and contains more soluble calcium and magnesium compounds. The national standard GB5749-2006 stipulates that the hardness of drinking water should not exceed 450 mg / L. [0003] If the hardness is too high, it will have a certain impact on human health and daily life after drinking. The hardness above 8 is usually called hard water. After boiling hard water, white foam will appear on the surface of the water or settle at the bottom of the kettle or cup. It is white and turbid, which makes people feel uncomfortable. Bathroom walls, tiles, kitchen utensils, floors, bathtubs, toilets, washbasins, etc. will be scaled ...

AI Technical Summary

Problems solved by technology

Hard water with a hardness of 8 or more is usually called hard water. After boiling hard water, white foam will appear on the surface of the water or settle at the bottom of the kettle or cup. Walls, tiles, kitchen utensils, floors, bathtubs, toilets, washbasins, etc. in the bathroom will be scaled and stained due to hard water; washing with hard water will also cause harm, waste detergent, colored clothes will fade easily, and white clothes will become dull and yellow After drying, the clothes become hard and not soft, and the wear of the washing machine is accelerated; the skin is not smooth and the hair is dull when bathed in hard water; hard water will form scale in the boiler, which not only reduces the heat transfer efficiency and energy utilization efficiency of the boiler, but also makes the energy consumption Increase, waste fuel, and the generated ditch is easy to block the pipeline, causing safety hazards

[0004] Distillation can be used to soften hard water, but the cost is high and it is not suitable for home use; RO membranes, electrodialysis and other equipment are complex, inconvenient to use, consume electricity and water, and cost high; ion exchange is troublesome to use, high in cost, and requires frequent regeneration and exchange Resin, and the prepared effluent has more sodium ions, which can easily cause cerebrovascular disease, cardiovascular disease, high blood pressure, etc.

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