A Coulombic Method for Measuring Biochemical Oxygen Demand of Wastewater
A biochemical oxygen demand and wastewater technology, applied in the direction of testing water, measuring devices, and electrochemical variables of materials, can solve problems such as not being able to adapt to rapid detection, achieve considerable application prospects, simple operation process, and reduce test time.
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Embodiment 1
[0047] Adjust the concentrations of glucose and glutamic acid to obtain artificial wastewater with a theoretical BOD concentration of 2-500 mg / L. The conductivity of the anode solution is 5ms / cm, the pH is 6.5, the reaction temperature is controlled at 25°C, and the result can be obtained within 6-48 hours. figure 1 The output voltage of different concentrations of artificial wastewater in the microbial fuel cell changes with time. Table 1 compares the calculation results of different concentrations of artificial wastewater according to the Coulomb method and the results of the traditional five-day biochemical method.
[0048] Table 1
[0049]
[0050] Among them, the relative standard deviation represents the reproducibility between the test results of the coulometric method, and the error is the comparison between the coulometric method and the theoretical value.
[0051] The results show that the error rate of coulometric test results for artificial wastewater relative ...
Embodiment 2
[0053] The concentrations of fixed glucose and glutamic acid are both 0.15g / L, that is, the theoretical BOD concentration is 200mg / L. Change NaH 2 PO 4 12H2 O and Na 2 HPO 4 2H 2 The concentration of O is to obtain artificial wastewater samples with different pH values, adjust the conductivity and reaction temperature, and the results can be obtained in 6-48 hours. The BOD results of the artificial wastewater with a theoretical BOD concentration of 200mg / L measured under different conditions are shown in Table 2.
[0054] Table 2
[0055]
[0056] Among them, the relative standard deviation represents the reproducibility between the test results of the coulometric method, and the error is the comparison between the coulometric method and the theoretical value.
[0057] The results show that, in the range of pH value from 7-8.0, the error rate of the coulometric method to artificial wastewater test results relative to the theoretical value is within 4%.
[0058] The re...
Embodiment 3
[0060] Select three kinds of actual wastewater, municipal sewage, landfill leachate and pharmaceutical wastewater, dilute them by 2 times, 10 times and 100 times respectively with phosphate buffer, adjust the pH value to neutral, and maintain the conductivity of the wastewater at 5-10ms / cm, The reaction temperature was controlled at 30-40°C, and the coulometric test was carried out (results were obtained in 6-48 hours), and compared with the results of the 5-day biochemical oxygen demand. The results are shown in Table 3. Table 3 results show that coulometric method is relative to standard BOD to actual wastewater test result 5 The error rate of the results is within 9%.
[0061] table 3
[0062]
[0063] The above results show that Coulomb method of the present invention detects artificial waste water and standard BOD 5 The detection results are not much different, but the time is greatly shortened to 6-48 hours, so it has a good application prospect.
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