Bench-scale Study on Operation Effect and Power Generation Performance Treatment of Dairy Farms Wastewater by Microbial Fuel Cell

doi:10.13304/j.nykjdb.2021.0852

Abstract

Abstract:

In order to investigate the feasibility of applying microbial fuel cell （MFC） to dairy farm wastewater treatment technology， a dual-chamber and a single-chamber MFC reaction device were constructed. Dairy farm wastewater was used as the anode reaction liquid， and its electrical performance and degradation effect of main pollutants in sewage were studied. The results showed that both single-chamber and dual-chamber MFC could operate stably with electricity， the average maximum output voltage was 563.8 and 390.8 mV， the maximum power density was 48.5 and 21.7 mW·m^-2， and the apparent internal resistance was 346.4 and 489.5 Ω， respectively， and the single-chamber MFC had better power generation performance than the dual-chamber MFC. The average removal rates of chemical oxygen demand （COD） in daily farm wastewater by single-chamber MFC and dual-chamber MFC were 79.3% and 77.4%， respectively. The average removal rates of total phosphorus （TP）， total nitrogen （TN） and ammonia nitrogen （NH $4 +$ -N） by single-chamber MFC were 70.9%， 65.4% and 78.9%， respectively. The corresponding removal rates were 101.4%， 24.3% and 21.0% higher than those of dual-chamber MFC， respectively， the pollutant removal rate of single-chamber MFC was superior to the dual-chamber MFC. MFC as a new method of wastewater treatment is technical feasibility for dairy wastewater treatment， it can generate electricity while degrading organic matter， nitrogen and phosphorus pollutants in dairy wastewater， and has broad prospects in achieving energy saving， carbon peaking and carbon neutrality.

Key words: microbial fuel cell, electricity production, degradation, dairy sewage, organic matter

摘要：

为探讨微生物燃料电池（microbial fuel cell，MFC）应用于奶牛场污水处理技术的可行性，通过构建双室型和单室型MFC反应装置，以奶牛场污水为阳极反应液，对MFC的产电性能以及污水中主要污染物的降解效果进行研究。结果表明，单室型和双室型MFC均可稳定地产电运行，平均日最大输出电压分别为563.8和390.8 mV，最大功率密度分别为48.5和21.7 mW·m^-2，表观内阻分别为346.4和489.5 Ω，且单室型MFC产电性能优于双室型；单室型和双室型MFC对奶牛场污水中化学需氧量（chemical oxygen demand，COD）的平均去除率分别为79.3%和77.4%；单室型MFC对总磷（total phosphorus，TP）、总氮（total nitrogen，TN）和氨氮（ammonia nitrogen，NH $4 +$ -N）的平均去除率分别为70.9%、65.4%和78.9%，分别比双室型MFC相应去除率高101.4%、24.3%和21.0%，单室型MFC对污染物去除率优于双室型MFC。MFC作为一种污水处理新方法，用于奶牛场污水处理具有技术可行性，其在降解奶牛场污水中有机物和氮磷污染物的同时能够产生电能，在实现节能减排、碳达峰和碳中和方面具有广阔前景。

关键词: 微生物燃料电池, 产电, 降解, 奶牛场污水, 有机物

CLC Number:

X713

Lu LIU, Xiuping TAO, Jianchao SONG, Bin SHANG, Wenqian XU, Hongmin DONG, Yangyang CAI. Bench-scale Study on Operation Effect and Power Generation Performance Treatment of Dairy Farms Wastewater by Microbial Fuel Cell[J]. Journal of Agricultural Science and Technology, 2022, 24(4): 134-143.

刘璐, 陶秀萍, 宋建超, 尚斌, 徐文倩, 董红敏, 蔡阳扬. 微生物燃料电池处理奶牛场污水运行效果与产电性能试验研究[J]. 中国农业科技导报, 2022, 24(4): 134-143.

Figures/Tables 8

Fig.1 Structure of microbial fuel cell reactor

Table 1 Inlet water quality characteristics of microbial fuel cell

化学需氧量

Chemical oxygen demand/（mg·L ^-1 ）

总磷

Total phosphorus/（mg·L ^-1 ）

总氮

Total nitrogen/ （mg·L ^-1 ）

氨氮

Ammonia nitrogen/（mg·L ^-1 ）

电导率

Conductivity value/ （μS·cm^-1）

Fig.2 Profile of daily maximum output voltage and water temperature during experimental period

Fig.3 Polarization curve and Power density curve

Fig.4 Content of contaminants in MFC anode reaction solution

Table 2 Average effluent water removal rate of MFC

MFC反应器腔室

MFC reactor chamber

COD

4 +

-N

双室型MFC

Dual-chamber MFC

单室型MFC

Single-chamber MFC

Table 2 Average effluent water removal rate of MFC

MFC反应器腔室

MFC reactor chamber

COD

4 +

-N

双室型MFC

Dual-chamber MFC

77.4±1.8 a

35.2±15.8 b

51.8±4.1 b

65.2±2.1 b

单室型MFC

Single-chamber MFC

79.3±2.0 a

70.9±5.2 a

65.4±1.5 a

78.9±1.2 a

Fig.5 Changes in pH during MFC operation

Table 3 Profile of Coulomb efficiency during test time

MFC反应器腔室

MFC reactor chamber

平均值

Average value

双室型MFC

Dual-chamber MFC

单室型MFC

Single-chamber MFC

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