| The world faces a crisis of freshwater resources, mainly due to serious waterpollution, water resources unreasonable development and low efficiency of usingwater. As an important method to solve the water crisis, water reuse can be reclaimedfor irrigation, watering road, flushing toilet, cooling water in industrial and recycledwater, and so on. In the method of water treatment, the final steps of each method issterilization, therefore, choosing a fast and effective method of disinfection is of greatsignificance.As a new disinfection technology, microwave electrodeless ultravioletdisinfection has a broad spectrum of bacterial, high efficiency of inactivation, savingenergy consumption, without disinfection byproducts, etc. The research adopts acombined disinfection method of microwave and ultraviolet, and microwaveelectrodeless UV lamp as a light source, according to the number of viable cells of amunicipal sewage treatment plant settling tank effluent water in Harbin, to study thelaw of the sterilization of various influencing factors, and establish the process ofsaving energy and time, operable by microwave electrodeless UV disinfection, inorder to achieve the standards of the reuse water, which provides relevant technicalparameters for microwave ultraviolet sterilization technology used in waterdisinfection. At the same time, in order to optimize the design of the reactor, we buildCFD model of the reactor of microwave eletrodeless UV disinfection and simulate theflow of the reactor. By comparison of the performance of the reactor by CFDoptimized, to verify the results by CFD simulation. The researchs of microwaveelectrodeless UV for the secondary settling tank of water treatment efficacy canensure the advantages of microwave electrodeless UV disinfection.At first, this paper carries out the production process of the microwaveelectrodeless UV lamp. The results show: the parameters of the electrodeless UVlamp affect the effect of disinfection, the effect comes to the best when the fillingmaterials are10mgHg and5TorrAr. When microwave power is300w, HRT=3min, noadjustment of the temperature and pH, the total number of bacteria and E. coli inwater can meet water quality standard for urban miscellaneous water consumptionand reuse.This article also carries out the research of building and optimizing the model ofCFD of the sterilized reactor with microwave electrodeless UV lamp. The resultsindicate: adding baffles and change the angle between the flaps don’t improve theflow pattern by building the model of CFD of the sterilized reactor with microwave electrodeless UV lamp and simulating the flow, while the flow pattern first changesfor better and then worse with increase of the number of the folded plate, water speedand the length of the folded plate. The flow has the bset state in the reactor when thenumber of the folded plate is4, water speed is0.39m/s and the length of the foldedplate is115~118mm.On the basis of the above-mentioned study, this dissertation carries out theresearchs of microwave electrodeless UV for the secondary settling tank of watertreatment efficacy. The results imply: the experimental results proves the results of thesimulation of CFD model and can handle more water in a shorter period of time,moreover, the total number of bacteria and E. coli in water can meet the standards;according to the disinfection effect and resurrection phenomenon of actual water,water samples can reuse within12h; compared to UV or microwave, microwaveelectrodeless UV can achieve a higher rate of sterilization within a shorter time, thechanges of water temperature are minor and won’t produce the phenonmenon of thethermal pollution, which reflects the advantages of disinfection of microwave and UV. |
