研究目的
To evaluate the effect of sodium citrate-induced exopolymer extraction on the efficiency of photocatalytic thin film (TiO2) pretreatment for enhancing anaerobic degradability and methane generation from waste activated sludge, with a focus on cost and energy analysis.
研究成果
Sodium citrate at 0.05 g/g SS achieved 94.2% exopolymer removal, enhancing TiO2 thin film pretreatment efficiency with 19.33% COD solubilization, 25% SS reduction, and 0.24 gCOD/gCOD methane generation. The method is economically feasible, saving energy and cost compared to controls, but requires optimization for large-scale implementation.
研究不足
The study is limited to lab-scale experiments; scalability to real-world applications requires further investigation. Reusability of immobilized substrates and potential generation of undesired compounds during pretreatment were not fully explored. The method showed negative net energy and cost, indicating economic challenges.
1：Experimental Design and Method Selection:
The study involved de-aggregation of sludge using sodium citrate, immobilization of TiO2 via DC sputtering and annealing, pretreatment with immobilized TiO2 under solar radiation, and bio-methanation tests to assess methane production. Kinetic studies and statistical analyses (ANOVA) were performed.
2：Sample Selection and Data Sources:
Waste activated sludge (WAS) was sourced from a dairy industrial wastewater treatment plant in Madurai, India, with initial characteristics provided (e.g., SCOD, TCOD, pH, SS, TS, protein, carbohydrate).
3：List of Experimental Equipment and Materials:
Equipment included orbital shaker, centrifuge, DC sputtering apparatus, tubular furnace, AOP tray, thermo gas chromatograph. Materials included sodium citrate, TiO2, glass substrates, argon gas, bovine rumen solution.
4：Experimental Procedures and Operational Workflow:
Steps included de-aggregation with sodium citrate (
5：01-1 g/g SS, 150 rpm for 1 h), centrifugation, TiO2 immobilization (DC sputtering at 3x10^-3 mbar Ar pressure for 4 min, annealing at 400°C for 4 h in O2), pretreatment in AOP tray with solar radiation (UV intensity 89-09 kWh/m2 for 90 min), bio-methanation with inoculum:
substrate ratio 1:3, and analytical measurements (SS, COD, EPS, enzyme activity).
6：Data Analysis Methods:
Data were analyzed using standard methods (APHA 2005), kinetic models (first-order for COD reduction and methane production), one-way ANOVA with Student's t-test (p<0.05), and energy/mass/cost balance calculations.
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