Technical Method Of Precision Machining Wastewater Treatment

Precision machining wastewater contains metal shavings, oil, and chemicals that are harmful to the environment. To treat this wastewater, the following technical methods can be used:

1. Coagulation and sedimentation: Coagulants like aluminum sulfate and ferric chloride are added to wastewater to destabilize the suspended solids, and then sedimentation is used to separate the solids from the water.

2. Chemical precipitation: Chemical precipitation involves adding chemicals like lime or sodium hydroxide to adjust the pH of the wastewater, which promotes the formation of metal hydroxides that can be easily separated from the water.

3. Biological treatment: Biological treatment uses microorganisms to break down organic compounds in the wastewater. In this process, wastewater is passed through a biological reactor where microorganisms feed on the organic matter and convert it into harmless substances like carbon dioxide and water.

4. Membrane filtration: Membrane filtration involves the use of ultrafiltration and reverse osmosis to remove suspended solids, oil, and chemicals from wastewater. It can remove up to 99% of impurities in wastewater.

These technical methods of precision machining wastewater treatment are effective in reducing environmental pollution caused by machining operations. By using these methods, harmful chemicals and pollutants can be removed from the wastewater, rendering it safe for discharge into the environment.