研究目的
To evaluate the hydraulic and hydrodynamic parameters influencing photo-catalytic degradation of bio-persistent pollutants in a pilot plant.
研究成果
The photo-catalytic degradation was effective, with optimal conditions at TiO2 dosage of 0.79 g/cm3 and influent dye concentration of 0.7 mg/L. Increased flow-rates improved kinetics due to better exposure and oxygen dissolution, while higher hydraulic loads and gradients slightly reduced performance. pH influenced sorption and degradation rates, with MB degrading faster than MR under the conditions tested.
研究不足
The catalyst was immobilized in a cement matrix, limiting the maximum TiO2 concentration to 0.79 g/cm3 due to homogeneity issues. The study was conducted on a laboratory scale pilot plant, which may not fully represent industrial conditions. Only specific dyes (MR and MB) were tested, and the effects might vary for other pollutants.
1：Experimental Design and Method Selection:
The study involved a kinetic analysis using an innovative pilot plant with a U-shaped channel layered with TiO2 catalyst in a cement matrix, activated by UVB light. The design aimed to assess the effects of various parameters on degradation rates.
2：Sample Selection and Data Sources:
Synthetic solutions of methyl red (MR) and methylene blue (MB) dyes in tap water were used, with concentrations ranging from 0.3 to 5.0 mg/L and pH around 7.
3：3 to 0 mg/L and pH around List of Experimental Equipment and Materials:
2.
3. List of Experimental Equipment and Materials: Equipment included a pilot plant with reservoirs, a U-shaped channel, UVB lamp (Vilber-Lourmat, France, 120 W, peak wavelength 312 nm), recirculation pump (Mod. CPm 130, Pedrollo, Milan, Italy; 0.37 kW, 230 V, 50 Hz), plates for flow-rate control, and a UV-Vis spectrophotometer (Mod. UVIKON 942, Kontron Instruments, Germany). Materials included titanium dioxide (TiO2, anatase form, average grain size 0.15 μm, specific gravity 3.85 g/cm3 from Adriatica Legnami s.r.l., Italy), methyl red (Sigma Aldrich), methylene blue, and cement for embedding.
4：37 kW, 230 V, 50 Hz), plates for flow-rate control, and a UV-Vis spectrophotometer (Mod. UVIKON 942, Kontron Instruments, Germany). Materials included titanium dioxide (TiO2, anatase form, average grain size 15 μm, specific gravity 85 g/cm3 from Adriatica Legnami s.r.l., Italy), methyl red (Sigma Aldrich), methylene blue, and cement for embedding.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The solution was recirculated from an upper to a bottom reservoir through the channel. Parameters varied included hydraulic load (hw), flow-rate (Q) controlled by plates, hydraulic gradient (i) of the channel, catalyst dosage, substrate concentration, and pH. Samples were taken at intervals, and residual dye concentrations were measured using UV-Vis spectrophotometry.
5：Data Analysis Methods:
Data were analyzed using pseudo-first order kinetics (ln(c/c0) = -k h t), and results were interpreted to determine rate constants and effects of parameters.
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