Biological Hydrogen Production Heep Yunn School Biological Hydrogen Production

Introduction Problems : Cause: Energy shortage + Global warming Theory Problems : Energy shortage + Global warming Cause: Burning fossil fuels Experiment Calculation Conclusion

Introduction Fossil fuels Alternative: Hydrogen Clean!!! Efficient!!! Theory Fossil fuels Alternative: Hydrogen Experiment HYDROGEN Clean!!! Calculation Efficient!!! Conclusion

+ Introduction General idea: Food Bacteria Hydrogen Theory General idea: Hydrogen + Food Bacteria Experiment Calculation Overflowing - Landfill Conclusion

Anaerobic methane+ hydrogen Introduction Theory Theory Aerobic  carbon dioxide + water Experiment Anaerobic methane+ hydrogen Calculation Conclusion

Theory Bacteria in soil Introduction Theory Experiment Calculation Conclusion

Introduction Theory Theory 100°C Experiment Calculation Conclusion

Hydrogen+ methane Theory Introduction Theory Experiment Calculation Conclusion

Experimental Procedures Introduction Experimental Procedures Gas produced is collected in a measuring cylinder by water displacement. Theory Food Treated soil Experiment Calculation Conclusion

Problems we faced How can we determine the molar mass of the gas? Introduction Problems we faced Theory How can we determine the molar mass of the gas? How can we find out the hydrogen composition in the biogas? Experiment Calculation Conclusion

Test for the gas Pop! The gas gives a pop sound with a burning splint. Introduction Test for the gas Theory The gas gives a pop sound with a burning splint. Experiment Calculation Pop! Conclusion

Transference of gas to a balloon Introduction Transference of gas to a balloon Acidic gases absorbed by concentrated Sodium Hydroxide Theory Moisture absorbed by solid calcium oxide in the U-tube Filtered gas collected in the balloon Water in Experiment Calculation By water displacement, the gas collected is pumped out of the bottle. Alkaline gases absorbed by concentrated sulphuric acid Conclusion

Introduction Calculation Theory Experiment Calculation Conclusion

Calculation By Newton’s first Law: By change of subject: Introduction Theory By Newton’s first Law: Experiment Reading of the balance Weight of the gas Weight of the balloon Up thrust Calculation By change of subject: Conclusion

Calculation W=mg Mass of the gas Introduction Theory Experiment Conclusion

Calculation nM = m Mass No. of of moles gas of gas Molar mass Introduction Calculation Mass of gas Theory No. of moles of gas nM = m Molar mass Experiment Calculation Conclusion

C Calculation Linear relationship Merging the two equations, we get: Introduction Calculation Theory Merging the two equations, we get: Experiment C Calculation Linear relationship Conclusion

Results Experiment 1: Test for food Introduction Theory Experiment Volume of gas produced (mL) Types of food Experiment Calculation Conclusion

Results Experiment 2: Test for optimal pH Introduction Theory Calculation Conclusion

Volume of biogas produced (mL) Introduction Results Experiment 3: Test for optimal temperature Theory Volume of biogas produced (mL) Experiment Calculation Conclusion

Conclusion The findings of our investigation are… Introduction Conclusion Theory The findings of our investigation are… Fastest rate of food decomposition occurs at 40 degree Celcius in acidic condition (pH4). Among different types of food, pork works the best. The gas produced in the reaction generally has the molar mass of 13, which indicates that 22-59% of the gas produced is hydrogen. The conditions only affect the rate of reaction, not the proportion of hydrogen produced. Experiment Calculation Conclusion

Integrated Science Conclusion Introduction Theory Experiment Calculation Conclusion