Constructed wetland microbial fuel cell coupling system and sewage treatment method

A fuel cell and constructed wetland technology, which is applied in biological water/sewage treatment, electrochemical biocombination treatment, water/sludge/sewage treatment, etc. Algae cathode is not suitable for promotion and other problems, to achieve the effect of improving purification effect and power generation performance, improving oxygen utilization rate, low construction cost and operating cost

Active Publication Date: 2018-08-17
HOHAI UNIV
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Problems solved by technology

Pratiksha Srivastava et al. used platinum as the cathode catalyst to obtain three times the power density, but its popularization was limited due to the expensive price of platinum.
Non-noble metal oxides have a wide range of sources and low prices. Liu et al. studied the influence of the morphology and size of the MnOx catalyst on its oxygen reduction performance, and the power density can reach 772 mW/m 3 , but the catalyst is prone to poisoning and failure, and the practical application is not long-term effective
Some researchers use algal photosynthesis to generate oxygen to supply oxygen to the cathode area. Compared with traditional mechanical oxygen supply, the concentration of dissolved oxygen in the cathode chamber of algae photosynthetic cathode fuel cell can reach 20 mg/L, but considering the artificial wetland The shading effe

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  • Constructed wetland microbial fuel cell coupling system and sewage treatment method

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Example Embodiment

[0026] Example 1: A hydraulically driven rotating air biocathode-enhanced microbial fuel cell coupling system for constructed wetland in this example. The processing object is high-concentration organic wastewater composed of tap water and glucose, and the influent COD concentration is 300mg / L , 600mg / L, 1200mg / L three stages, the water temperature range is 20~25℃.

[0027] When the influent COD concentration is 300mg / L, the monolithic rotating cathode is used to completely remove the effluent COD, and finally a stable voltage of about 680mV is obtained, and the dissolved oxygen concentration in the cathode area stabilizes at 2.5mg / L. When the influent COD concentration is 600mg / L, the single-chip rotating cathode 3 is used, the COD removal rate reaches 95%, and the stable voltage is about 750mV. The dissolved oxygen concentration in the cathode region 9 stabilizes at 1.8mg / L, and the cathode increases By the time of two discs, the COD removal rate reached 98%, a stable voltage o...

Example Embodiment

[0028] Embodiment 2: A hydraulically driven rotating air bio-cathode-enhanced microbial fuel cell coupling system for constructed wetland in this embodiment, the treatment object is refractory organic wastewater composed of nitrobenzene and glucose, and the influent water is 50mg / L Nitrobenzene+300mg / L glucose, 100mg / L nitrobenzene+300mg / L glucose, 200mg / L nitrobenzene+300mg / L glucose, the water temperature range is 18~26℃.

[0029] When the inlet water is 50mg / L nitrobenzene + 300mg / L glucose in the first stage, the single-chip rotating cathode is used, the COD of the effluent is completely removed, and the removal rate of nitrobenzene is 100%. The final stable voltage is about 580mV. The dissolved oxygen concentration in the cathode region is stable at 2.5 mg / L. When the inlet water is 100mg / L nitrobenzene+300mg / L glucose in the second stage, using a single-piece rotating cathode, the removal rate of COD reaches 93% and the removal rate of nitrobenzene is 95%, and the stable vo...

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Abstract

The invention discloses a biological cathode strengthened type constructed wetland microbial fuel cell coupling system and a sewage treatment method. The system is characterized in that the system isprovided with a first gravel layer, a positive pole, a second gravel layer, a negative pole and emergent aquatic plants sequentially along the water flow direction, a water inlet and a water outlet are positioned below the first gravel layer and above the second gravel layer respectively, and the positive pole is connected with the negative pole through an external circuit. The dissolved oxygen concentration of a negative pole area is increased by hydraulically driving the negative pole to rotate, the oxygen utilization rate is increased through secretases of microorganisms on the negative electrode, a wetland substrate provides a great place for microorganism growth, microorganism activity is improved by root system sediments and an oxygen secretion function of wetland plants, and accordingly purification effects and power generation performance of the coupling system are improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a sewage treatment device and a sewage treatment method, in particular to a hydraulically driven rotating air biological cathode enhanced artificial wetland microbial fuel cell coupling system and an organic sewage treatment method. Background technique [0002] In the traditional constructed wetland microbial fuel cell coupling system, the substrate of the constructed wetland with a large specific surface area is inhabited by rich and diverse microorganisms, which increases the number and biodiversity of microorganisms in the microbial fuel cell; the secreted sediments of plant roots are anode microorganisms The organic carbon source is provided as a co-substrate, which improves the microbial activity and the removal effect of pollutants. The oxygen secretion of the root system and the reoxygenation of the atmosphere provide a good aerobic environment for the degradation o...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F3/30C02F101/38
CPCC02F3/005C02F3/30C02F3/32C02F2101/38
Inventor 赵联芳路宗仁次仁吉保朱丹丹贺丽谭陈
Owner HOHAI UNIV
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