The sewage that contains heavy metal mainly originates from printing circuit board, metal rinsing and galvanization and pulp manufacture, etc. In order to control the heavy metal pollution, protect ground water, the China government formulates unified sewage exhaustion standard, and the First Grade exhaustion standard of copper is 0.5mg/L.
When there is complexing agent in sewage, such as NH3, EDTA, organic phosphate, citrate, natural organic acid, it will react with heavy metal ion and generate steady complex compound, and interfere the treatment to heavy metal of traditional technology. Using other treatment methods, it is not easy to fulfill well treatment effect or high cost. |
