Study On PH Of Microbial Fuel Cell Based On Optical Fiber Evanescent Wave Sensor

With the rapid development of moderm industry and the rapid expansion of emerging technologies,people are also aware of the major problems of energy consumption and environmental pollution.Microbial fuel cell(microbial fuel cell)as a new clean energy,in electricity production,but also deal with the sewage is due to the characteristics of the microbial fuel cell,making it likely in sewage treatment and electricity generation capacity play a huge role.At present,a large number of research on microbial ftiel cells has emerged in China and abroad,and how to improve the performance of microbial fuel cells has become the focus of attention.A large number of studies have indicated that the factors affecting the performance of microbial production mainly include:the types of microorganisms,the structure of the battery,the type and concentration of the matrix,the pH value of the solution of the temperature and the pH value of the solution.Because of the series of biochemical reactions occurring in the process of producing electricity,the pH value of the solution is especially important for the performance of microbial fuel cells.So real-time monitoring of the microbial fuel cell in solution of pH changes can better understand the battery in microbial occurrence process of biochemical reactions in the solution pH in,to improve the performance of microbial fuel cell electric has very important significance.Due to its advantages of small size,corrosion resistance,high precision and good real-time performance,fiber optic chemical sensors have been widely used in the field of biochemical reactions.Fiber optic chemical sensor has the following advantages:first,the sensitivity of the sensor is high,than the traditional pH sensors to high;second,it has a very short response time;again,the optical signal in information transfer,with very good electromagnetic resistance and anti-interference ability,and good resistance to corrosion and ultra high electrical insulation;and because the fiber flexibility is good,volume is small,weight is light,so it can be processed into a variety of shapes.Therefore,long distance measurement is also very possible for fiber optic chemical sensor,in some people can not go to the place can also be very easy to complete the measurement of some parameters.Through the efforts of numerous scholars,fiber optic chemical sensor has formed as independent and has strong characteristics of the specific system.Among them,fiber optic chemical sensor with their high sensitivity and high selectivity,has become a large number of scientists measured information tool of choice.Optical fiber sensing technology combines the knowledge of many subjects,such as pH,chemistry,optics and its sensitive area can personality identification of single substance to be measured and optical fiber transmission in sensitive areas,by the measured substances to sensitive areas of chemical action,which will cause in response to changes in the optical properties of light waves in optical fiber transmission.Therefore,this paper adopts a new optical fiber biosensor evanescent wave solution pH sensor in the microbial fuel cell and the pH of the solution for real-time measurement.Firstly the making process of the microbial fuel cell was studied and electricity production principle,based on,combined with the optical fiber biosensor evanescent wave chemical sensor working principle,design a real-time measurement of the microbial fuel cell in solution pH changes of new optical fiber solution to a pH sensor,finally will make good fiber solution pH sensor package embedded in microbial fuel cell anode chamber.Through measurement system is built to the real-time measurement of the microbial fuel cell anode chamber in the power generation cycle solution of the pH change of situation.The main content of this subject includes a few points.(1)In-depth study of the structure and working principle of microbial fuel cells,the production and operation of two chamber microbial fuel cell reactor,easy to carry out the follow-up measurement experiment.(2)In-depth study based on the working principle and design method of evanescent wave fiber optic pH sensor,select suitable materials as pH sensitive indicator,and the sol gel method will be a sensitive indicator for coating to the cladding of the fiber core surface,made into a wide range of optical fiber solution pH sensor,and the calibration experiment established fiber evanescent wave absorption optical power and solution pH value of the solution between the relationship,complete the production of optical fiber pH sensor calibration.(3)Will be produced fiber optic pH sensors embedded in the anode chamber of the microbial fuel cell and measurement system is built,real-time measurement of microbial fuel cells in electric throughout the production process,changes in the voltage and internal solution pH changes in the situation.(4)Analysis of experimental data,to establish a microbial fuel cell output voltage and solution pH curve,through the regulation of microbial fuel cell anode chamber solution pH to improve microbial fuel cell power generation performance provide strong experimental support.