Method for removing cadmium metal in source water by using hydrated manganese dioxide

Abstract

The invention discloses a metal cadmium removing method in the water source through hydrated manganese dioxide, which comprises the following steps: putting potassium permanganate and manganese sulfate at 1:1.5-1.54 molar rate in the water with nonattainment cadmium; flocculating; flowing water in the incidence sedimenting pool; filtering the sedimented water through filtering pool. The invention makes Cd2+ density far lower than drinking water standard at 0.005mg / L, which removes cadmium through adsorbing property of hydrated manganese dioxide.

Description

(1) Technical field [0001] The invention relates to a water treatment method, in particular to a method for removing cadmium pollutants in water. (2) Background technology [0002] Cadmium is highly toxic and can accumulate in the human body, mainly in the kidneys, causing changes in the urinary system. And it can replace the calcium in the bones to make the bones soft and shrink. When the cadmium in water is 0.1mg / L, it can slightly inhibit the self-purification of surface water. [0003] At present, my country's cadmium pollution is serious, such as the cadmium pollution in the Beijiang River Basin in Guangdong, the cadmium exceeds the standard by nearly 10 times, which directly endangers people's physical and mental health. Therefore, it is imminent to eliminate cadmium pollution to water sources. [0004] For source water polluted by cadmium, the method of lime neutralization is usually used at present, and this method has obvious effect only under the condition of PH=...

AI Technical Summary

Problems solved by technology

Since the pH value of the water neutralized by lime exceeds the drinking water standard, it is necessary to add acid to neutralize and adjust the pH value process, which requires high energy consumption and a large amount of chemicals, and the treatment cost is high