Background
A city sewage treatment plant needs to treat the secondary effluent (SS≤30 mg/L, COD≤60 mg/L) to the reuse standard (SS≤5 mg/L, COD≤20 mg/L) for green irrigation.
Solution
- Combined process: fiber ball filter (modified polyester fiber ball) + ozone oxidation to achieve deep filtration and organic matter degradation.
- Operation parameters: filtration speed 10 m/h, backwash cycle 48 hours.
Implementation effect
- Effluent water quality: SS≤3 mg/L, COD≤15 mg/L, meeting the reuse requirements.
- Energy saving: No additional chemical coagulant is required, and energy consumption is reduced by 50% compared with the ultrafiltration system.
- Stability: Strong tolerance to water quality fluctuations (such as high turbidity in rainy season).
Key points
The high porosity and adsorption capacity of fiber balls, combined with the synergistic effect of ozone, can efficiently remove colloidal organic matter and tiny particles.
