What are the common methods for water filters to treat lead-containing wastewater?

Lead in water filters is often used as a raw material in the manufacturing of batteries, electroplating, paint, rubber, pesticides, fuel, paint, lead glass, explosives, matches, etc. The acid wastewater (pH<3) discharged from the lead plate manufacturing process has the highest lead concentration, and the wastewater produced by the electroplating industry dumping the electroplating waste liquid has a high lead concentration. In most wastewater, lead exists in inorganic form. However, the industrial wastewater discharged from the tetraethyl lead industry contains high concentrations of organic lead compounds.

The commonly used methods for treating lead-containing wastewater include precipitation, coagulation, adsorption, galvanic iron oxidation, etc. Since the conventional treatment method (precipitation method) of inorganic lead in water filters is difficult to remove these organic compounds, the treatment of tetraethyl lead industrial wastewater is particularly difficult.

Arsenic has a gray metallic luster and is insoluble in water, but there are many arsenic-containing compounds that are easily soluble in water. Inorganic arsenic mainly exists in water in the form of arsenite ions and arsenate ions. In the presence of dissolved oxygen, arsenic acid can be oxidized into arsenate, which is less toxic. Arsenic acid and arsenate exist in industrial wastewater from industries such as metallurgy, glassware, ceramics, leather, chemicals, fertilizers, petroleum refining, synthetic sulfuric acid, fur, dyes and pesticides.

Conventional treatment methods for arsenic in water filters include lime or sulfide precipitation, or co-precipitation with iron or aluminum hydroxide. The traditional flocculation process of wastewater treatment can also effectively remove arsenic in wastewater, and the adsorption of activated carbon or alumina is used. And ion exchange has also achieved varying degrees of success in the removal of arsenic in wastewater. In recent years, the use of biochemical methods to treat arsenic-containing wastewater has made progress. Experiments have shown that the activated sludge method can remove arsenic extremely quickly. It can remove about 80% of the total within 0-5 hours, and within 1-2 hours The left and right reach the equilibrium state, that is, after a short time contact between arsenic and sludge, there will be a large amount of removal effect. The removal rate of low-concentration arsenic by water filter activated sludge is significantly higher than the removal rate of high-concentration arsenic, which also shows that the sludge’s ability to remove arsenic is also limited.

Reverse Osmosis & Water Filtration Systems in Wastewater Treatment

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