| Facing the energy shortage, microbial fuel cell (MFC) can generate electricity at the same time treating wastewater, so it has been widespread concerned. However, the power generated is small at this stage. If want to take advantage of the power, you need to design collection circuits and power transmission devices. With the social development of Pharmaceuticals and Personal Care Products(PPCPs) has been widely used, such pollutants in low concentrations in the water environment, and water treatment processes are not designed for PPCPs, resulting in Some PPCPs are difficult to effectively remove.This paper proposes a biochemical system that uses electricity generated by MFC integrated with activated sludge system treating a typical PPCPs-oxytetracycline. The MFC power converted from wastewater was further applied to the water treatment, which use of power in time, eliminating the tedious collection device and circuit, while can further improve water quality. The obtain results are as follows:1. When MFCs are in series, the voltage will be reduced. When the three MFCs are series, it can generate a voltage of about IV, and these power transports to graphite electrode in active sludge system, composed of bio-electrochemical system. After running stable, the removal of low concentrations oxytetracycline is better than conventional activated sludge systems.2. When the oxytetracycline concentration of influent changes between 0.5-3mg/L, influent COD changes between 400-1200mg/L, HRT changes between 4-11.2 hours, oxytetracycline removal in biological electrochemical systems will be higher than conventional activated sludge systems and other water indicators slightly higher than conventional activated sludge systems or at the same level, and the bio-electrochemical system is stable, less chance to sludge bulking.3. Using electron microscope of microorganisms, known the microbial species and morphology in bioelectrochemical systems are both different from the conventional activated sludge. The use of second-generation sequencing assay system activated sludge community structures, indicating that microbial species in electrode plate of biological electrochemical system are more than the conventional activated sludge system. Electrode plates are the central part of bioelectrochemical system, and microbial species of bioelectrochemical system are quite different from conventional activated sludge systems. After screening, we got one pair of bacteria which can efficiently degradaedlow concentration of oxytetracycline, after 16sRNA sequenced we found that this bacteria belonged to the Stenotrophomonas sp. Maximum removal of 2mg/L oxytetracycline was 41% in 6 hours.4. cycle degradation experiments show that a electrolysis system and conventional activated sludge system can partly degraded oxytetracycline, but the oxytetracycline removal of bio-electrochemical system is higher than the above two systems. Oxytetracycline degradation process analysis by HPLC-MS, we can see the removal of oxytetracycline in bioelectrochemical system including the electrolysis process and the biodegradation process, and not simply the effect of superposition of these two effects are mutually the role and influence each other, and then adapt to each other form the stable and efficient biological electrochemical system.5. MFC- bioelectrochemical system continuous flow experiment, indicating that MFC technology for low concentration of oxytetracycline wastewater have better treatment effect compared to anaerobic sludge sludge, although the effect of bioelectrochemical system is superior traditional aerobic activated sludge process, but it did not reach the treatment effect above. It shows that phosphorus have some negative impact on the system. |
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