activated alumina, pseudoboehmite, Zibo XiangRun Environment Engineering Co., Ltd.

Requirements for the removal of fluorine by activated alumina adsorption

1) When the turbidity of the raw water exceeds 5NTU, the micropores on the surface of the activated alumina filter material are easy to block and lose the adsorption capacity; when the fluorine content of the raw water exceeds 10mL, the defluoridation effect is not affected, but the water treated by each adsorption cycle Minimal, frequent regeneration, high operating costs.

2) The smaller the particle size of activated alumina, the greater the adsorption capacity; but the mechanical strength will be reduced if it is too fine, and it is easy to wear and be washed away by water.

3) When the pH value of the influent water is around 5.5, the adsorption capacity of activated alumina is the highest; the pH value of the groundwater is generally above 7.0, so the pH value of the raw water should be lowered to 6.0-7.0 when conditions permit Meet the requirements of continuous operation, improve fluoride removal capacity and reduce costs. Sulfuric acid and carbon dioxide are often used to adjust the pH value of raw water, and acidic solutions such as hydrochloric acid and acetic acid can also be used. . 5%-1.0%, the pH value should be lowered to 6.0.6.5; adjust the pH value with carbon dioxide, the water quality is the best, and the pH value should be lowered to 6.5-7.0. Regarding the selection of filtration speed, the filtration speed takes a lower value when the pH value is higher, and takes a higher value when the activated alumina particle size is small.

4) With regard to the choice of filter layer thickness, the larger value is selected when the influent fluorine content, high pH value, and high filtration rate are used.

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