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| DOI：10.13522/j.cnki.ggps.20180084 |
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| Effect of pH and C/N on Nitrogen and Phosphorus Removal in Microbial Fuel Cell |
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ZANG Huasheng, ZHOU Xinguo, LI Huizhen, ZHEN Bo, TIAN Guangli, YANG Shenjiao, YONG Beibei
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1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;2.Graduate School of Chinese Academy of Agriculture Sciences, Beijing 100081, China;3.Shangqiu Farmland Ecological System State Field Observation Research Station, Shangqiu 476001, China
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| Abstract: |
| 【Objective】The purpose of this paper is to study the effect of pH and carbon-nitrogen ratio on removal of nitrogen and phosphorus from soil using microbial fuel cell.【Method】 A single-chamber microbial fuel cell was used, in which pH in the anodized liquid varied from 5.0 to 9.0, and when the pH was 70 we examined carbon-nitrogen ratio at 1∶1, 2∶1, 4∶1, 8∶1 and 16∶1 respectively. In each experiment, we measured the change in voltage, COD, ammonia, nitrate, total nitrogen and total phosphorus in two changing cycles of the pH and the carbon-nitrogen ratio.【Result】When else conditions were the same, increasing pH in the anolyte to 8.0 increased the voltage to 204.74 mV, with the associated removal efficiency of COD, ammonia, nitrate and total nitrogen being 74%, 38%, 93%, and 58% respectively. But a further increase in the pH deteriorated performance of the cell. When the pH was 9.0, the removal efficiency of total phosphorus peaked at 24%. The voltage peaked at 158.33 mV when carbon-nitrogen ratio was 4. The removal rate of COD, ammonia, nitrate and the total phosphorus increased first followed by a fall as the carbon-nitrogen ratio increased, peaking at 65% when the carbon- nitrogen ratio was 4. When the carbon-nitrogen ratio was 2, the removal rate of ammonia peaked at 35%. The removal efficiency of nitrate and total phosphorus peaked at 96% and 16% respectively when the carbon-carbon ratio was 8.0. The removal efficiency of total nitrogen increased with the increase in carbon-nitrogen ratio, peaked at 59% when the ratio was 16. 【Conclusion】Keeping the carbon-nitrogen ratio at 4 and the pH at 8 was most efficient to remove nitrogen and phosphorus from the soil water. |
| Key words: carbon-nitrogen ratio; pH; voltage; COD; nitrogen and phosphorus; removal rate |
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