Silica-Alumina Ozone Catalyst: An Innovative Tool for Efficient Wastewater Treatment
Advanced oxidation with ozone uses the strong oxidising power of ozone to break down pollutants; it reacts quickly, produces no secondary pollution and improves water quality, but suffers from low ozone utilisation and high cost. Heterogeneous catalytic ozonation overcomes these drawbacks effectively by introducing a catalyst.
Technical advantages of the KHC-F2001 silica-alumina catalyst
Our silica-alumina ozone catalyst KHC-F2001 is prepared by a sol-gel method with multi-stage precisely controlled sintering and pore-forming treatment, giving it the following core advantages:
1. Precious-metal enhanced activity: doping with platinum (Pt) and other precious metals raises the density of active sites through electronic and geometric effects, improving catalytic efficiency by more than 20% and strengthening resistance to poisoning.
2. High specific surface area: 250-300 m²/g (comparable products on the market reach only 50-100 m²/g), providing abundant reaction interfaces and optimising pollutant degradation efficiency.
3. Exceptional stability:
Mechanical strength: compressive strength above 150 N per particle and an attrition rate of only 0.13% (300 r/min shaking for 24 h).
Corrosion resistance: withstands strongly acidic and alkaline conditions from pH 3 to 12 (12 h immersion with no cracking and no metal leaching).
Anti-clogging: the unique structure prevents reaction products from clogging the pores and extends service life.
4. Super-hydrophilic modification: atomic deposition technology enhances surface hydrophilicity, promoting pollutant adsorption and diffusion and improving catalytic activity and long-term stability.
Figure. Silica-alumina ozone catalyst
High-efficiency application cases
1. Oily emulsified acidic water: coking wastewater at a petrochemical plant was treated in an ozone reactor packed with 50% KHC-F2001 (15 min retention); COD removal exceeded 90%, the effluent COD was below 50 mg/L and oil content below 3 mg/L, with a footprint only 1/3 of that of the conventional process.
2. Mature landfill leachate treatment:
Fuzhou project: inlet COD 3000 mg/L; after 30 minutes of treatment the effluent COD was below 200 mg/L, total nitrogen fell to 60 mg/L and biodegradability improved markedly.
Zhangzhou project: leachate with high salinity (above 30,000 mg/L), inlet COD 400 mg/L and colour above 500; after 30 minutes the effluent COD was below 60 mg/L and colour below 5.
3. Pharmaceutical wastewater: wastewater from a pharmaceutical plant in Inner Mongolia (high COD, high colour, biotoxic) was catalytically treated with KHC-F2001 for 45 minutes; the effluent COD was below 200 mg/L, suspended solids below 20 mg/L and the B/C ratio rose from below 0.1 to 0.37.
Figure. Treatment of pharmaceutical wastewater in Inner Mongolia with KHC-PC2001
Conclusion
Through four technical innovations - precious-metal activation, a high specific surface area structure, exceptional stability and hydrophilic modification - the KHC-F2001 silica-alumina ozone catalyst markedly improves ozone utilisation and pollutant degradation efficiency. It shows efficient, stable and economical potential in complex waters such as oily wastewater, high-salinity leachate and pharmaceutical wastewater, providing reliable technical support for wastewater treatment.
