1.Environmental Water Sample Degradation Data Report 1. Experimental principle
This experiment uses the principle of electrochemical catalytic oxidation and uses the BDD electrode as the main reaction device to finally convert the organic matter in the water sample into CO2 and H2O, nitrate nitrogen and ammonia nitrogen into nitrogen.
2.1 Anode: Two BDD electrodes with a single crystal silicon substrate with an surface area of 200cm².
2.2 Cathode: Three titanium sheets.
2.3 Plate spacing: 3mm
3. Experimental operation
Take 1L of the water sample in the beaker, put it into the BDD electrode module (the actual anode area is 170cm2), connect the power supply, adjust the current intensity to 8A, the duty cycle to 80%, the frequency to 4000Hz, and the degradation begins. During the degradation process, the water sample is stirred with a magnetic stirrer to make it uniform. Take samples at regular intervals, record current and voltage values, and measure temperature and pH.
4. Experimental phenomenon
Picture 1 shows the experimental phenomenon at 0min degradation
Picture 2 shows the experimental phenomenon at 60min degradation
Picture 3 shows the experimental phenomenon at 120min degradation
Picture 4 shows the experimental phenomenon at 180min degradation
3. Actual engineering electrode budget
Water volume 6.25m³/h ,150t/d
Calculated according to the experimental results: 180 minutes degraded to the required concentration, used BDD electrode area: 170cm2, current: 8A, current density: 47mA/cm2;
6.25m³ water per hour, the current density is designed to be 235mA/cm2, and the required electrode area is 63.75m2. (3*6250*170cm2/5=637500cm2=63.75m2)
Operating cost: electricity consumption per ton of water is 154.08KW·h, average electricity price in China is $0.12, and the total cost of ton of water is about USD18.48.