光合微生物燃料电池处理餐厨沼液的性能研究

Study on the performance of photosynthetic microbial fuel cell in the treatment of kitchen biogas slurry

采用小球藻作为双室光合藻微生物燃料电池(PAMFC)的阴极以提供电子受体,实现污水处理和能量回收的双重目的.研究生物阴极接种方式和光照条件对生物产电性能和餐厨沼液废水处理效果的影响,并通过循环伏安法(CV)研究PAMFC电极极化和产电机制.结果表明:微藻生物膜阴极PAMFC污染物去除和产电性能表现优于对照组,COD,TN和TP去除率最高可达82.4%,54.5%和82.3%,开路电压和最大功率密度分别达603.0mV和41.5mW/m^2.污染物去除主要在阳极发生,但阴极能够还原去除来自阳极的铵根离子,且阴极反应产生氧气作为阳极的电子受体,增大系统电流,提高了阳极处理效率.持续光照下,PAMFC产电性能和污染物去除率略高于间歇光照,但是间歇光照可以避免阳极基质不足时阴极光饱和和氧饱和情况,更符合连续运行要求.PAMFC阴极的CV曲线显示,具有微藻阴极的实验组输出电压更大,还原峰更高,功率密度更强,但需注意长期运行时微藻生物膜增厚影响氧传质效率的问题.

Chlorella was used as the cathode of the double-chamber photosynthetic algae microbial fuel cell(PAMFC)to provide electron acceptors,and thus to achieve the goal of sewage treatment and energy recovery.The effects of biocathode inoculation methods and light conditions on the bioelectricity generation performance and the treatment effect of kitchen biogas slurry wastewater were studied,and the polarization and electricity generation mechanism of PAMFC electrode was studied by cyclic voltammetry(CV)method.The results showed that the microalgae biofilm cathode PAMFC had better pollutant removal and power generation performance than the control group,with COD,TN and TP removal ratio up to 82.4%,54.5%and 82.3%,and open circuit voltage and maximum power density up to 603.0mV and 41.5mW/m^2.While the pollutant removal mainly occurred at the anode,the cathode reduced and removed the ammonium ions from the anode,and the cathode reaction generated oxygen as the electron acceptor of the anode,which increased the system current and improved the anode treatment efficiency.Under continuous light condition,PAMFC's power generation performance and pollutant removal rate were slightly higher than that under intermittent light condition,but intermittent light avoided cathode light saturation and oxygen saturation when the anode substrate was insufficient,which was more in line with continuous operation requirements.The cyclic voltammetry curve of the PAMFC cathode showed that the experimental group with the microalgae cathode had higher output voltage,higher reduction peak,and stronger power density,but attention must be paid to that the thickening of the microalgae biofilm affected the oxygen mass transfer efficiency in long-term operation.