水中镉来源及处理
Source
Cadmium enters the environment through a variety of industrial operations, it is
an impurity found in zinc. By-products from mining, smelting, electroplating,
pigment, and plasticizer production can contain cadmium. Cadmium emissions come
from fossil fuel use. Cadmium makes its way into the water supplies as a result
of deterioration of galvanized plumbing, industrial waste or fertilizer
contamination.. The US EPA Primary Drinking Water Standards lists Cadmium with a
0.005 mg/l MCL.
Treatment
Cadmium can be removed from drinking water with a sodium form cation exchanger
(softener). Reverse Osmosis will remove 95 - 98% of the cadmium in the water.
Electrodialysis will also remove the majority of the cadmium.
