1. There are various types and high concentrations of pollutants: Chemical substances used in semiconductor manufacturing process are numerous, including various acids, bases, organic solvents, heavy metals, etc. These substances are often high in content in wastewater.

2. High toxicity: Heavy metals and organic solvents in semiconductor wastewater have significant toxicity to human health and the environment.

3. Volatility of concentration: Due to fluctuations in the production process, the concentration of pollutants in semiconductor wastewater often fluctuates significantly.

4. High recycling value: Many substances in semiconductor wastewater have high recycling value, such as heavy metals and organic solvents.