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1.Water information
| Resource | Company | Environmental companies | ||
| contact | ||||
| Water Ingredient | Introduction | Wastewater containing methyl phosphate, dimethyl phosphate and ethyl phosphate | ||
| COD | >60000 | TOC | ||
| Ammonia | Total nitrogen | |||
| pH | 5.34 | Total phosphorus | ||
| Chloride ion concentration | Salt content | 60000以上 | ||
| others | ||||
| toxicity | ||||
| Sample time | ||||
| requirement | COD 20000以下 | |||
| Note | ||||
2.Experimental principle
1.1 This experiment uses the principle of electrochemical catalytic oxidation, with the BDD electrode as the core reaction device, and finally converts the organic matter in the water sample into CO2 and H2O.
3.Experimental operation
3.1 Trial test
Take 900ml of water sample into the beaker, put it into the BDD electrode module, connect the power supply, adjust the current intensity to 8A, and start to degrade. 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.
3.2 Middle test
Electrolyzer type pilot plant; take 70L water sample, electrode area 0.624㎡, adjust pulse power average current 220A, frequency 12000Hz, duty cycle 60%, average voltage is 13.5V.
4.Experimental phenomenon
Before degradation, the water sample was basically colorless; a very small amount of foam was produced during the degradation process, and almost no precipitation was produced.
5.Results and analysis
| Time/h | Voltage
/V |
Current/A | BDD area
/cm2 |
COD/
mg/L |
||
| 0 | 4.75 | 8 | 150 | 67932 | ||
| 10 | 40601 | |||||
| 14 | 32070 | |||||
| 16 | 24840 | |||||
| 18 | 20300 | |||||
| Time/h | Voltage
/V |
Current/A | BDD area
/cm2 |
COD/
mg/L |
| 0 | 13.5 | 220 | 0.624 | 67932 |
| 11 | 44628 | |||
| 19 | 32153 | |||
| 27 | 16520 | |||
| 35 | 2363 |
6.Comparison of experimental results
Comparing the energy consumption per ton of water when calculating COD=20,000, considering the pilot test 25h, the pilot test energy consumption is 49.1% of the pilot test, and the efficiency is 2.0364 times that of the pilot test.
In order to control the stability of the water volume, the accuracy of the comparison experiment is pursued; the temperature of the pilot test water is controlled at about 50℃; if the evaporation of water does not need to be considered, adjusting the higher temperature can further increase the electrolysis efficiency.
1, Trial Test:
2，Middle Test:
