Removal Of Water, Aluminum And Fluoride

Both aluminum and fluorin are important contaminants in water. The excess amount of the either element has some negative effect to people's health. In 1989, World Health Organization formally identified aluminum as food contaminant and proposed that the amount of aluminum that human take in each day should not exceed 1.0 mg per kilogram of body weight. Excessive fluoride from industrial waste water will pollute the environment and do harm to the crops and livestock; Moreover, it will seriously affect the health of human. As suggested by Health ministry that the appropriate fluoride content for drinking water is 0.5～1.0 mg/L. According to < Integrated Wastewater Discharge Standard > GB8979—1996, the maximum concentration of fluorine in industrial wastewater should be below 10mg/L. Therefore, the removal process of fluoride and aluminum in the water has been a research hotspot in health field. In this paper, both aluminum and fluoride removal issues have been studied. The detailed information of the discussion is listed as follows.1. The residual aluminum in drinking water and industrial wastewater has been studied and discussed, respectively. The categories of coagulant and the differences of raw water's effects were investigated. It was found that the amount of coagulant, turbidity, pH, and temperature of raw water and the status of water played important roles in the quantity of residual aluminum in drinking water. Based on the experiments, the disciplinarian of each factor's influences on aluminum has been found. Also, it was found that two routes to remove aluminum from water, one is by reducing dissolved aluminum, and another is by removing aluminum solids. A linear relationship to a certain extent was shown between residual turbidity and residual aluminum in filtered water. In this case, aluminum solids can be removed while turbidity is removed. By changing the pH value of water, the ratio of dissolved aluminum to solid aluminum can be changed, and then the removal rate of residual aluminum can be improved.In addition, the connection, between the residual aluminum and turbidity in clarified effluent or filtrated effluent, is osmosed through whole thesis, in order that we could discover the consistency how. to remove the aluminum and turbidity in drinking water, so the purpose for reducing the residual aluminum in potable water may be achieved through controlling turbidity strictly.2.0verdischarging F in industrial waste water will pollute the environment,harm the normal growth of crops and livestocks and even severely affect the health of human beings. So defluorination in industrial waste water and F control in water resource become the most important research tasks in environment protection and sanitation fields home and abroad. This paper is about defluorination experiment. Acording to the tests, I evaluated the experiment effect of defluorination through lime-sedimentation,the combination of Ca(OH)₂+PAM.