| At present,with the rapid economic development in our country and steady improvement of the living standard of the people,the traditional methods of chemical disinfection of drinking water are easy to operate because of their low cost,but they are not safe enough to meet people's ever-stricter drinking water quality requirements.As a physical method,UV disinfection is widely used in recent years because of its advantages of easy operation,fast and effective disinfection,no secondary pollution and so on.It has wide development prospect and research value.This experiment uses self-developed enhanced reflection and diversion DR UV sterilizer,where D represents the diversion,R represents the reflection.It is different from the existing sterilizer in the market,using a new diversion design,water inlet and outlet set the other side,and set the center column,play to reduce the thickness of the water layer to avoid the role of short-flow phenomenon.In addition,in the disinfection container to increase the polished aluminum reflector for multiple enhanced reflection,to enhance the intensity of ultraviolet radiation in order to improve disinfection efficiency and save energy.In this experiment,the effect of DR ultraviolet sterilizer on drinking water was studied by changing the ultraviolet dose.UV dose is determined by the hydraulic retention time and UV intensity.Hydraulic retention time is controlled by the different sampling port position and influent flow changes.Ultraviolet intensity is controlled by changing the number of ultraviolet lamps.The experiment used laboratory water as test water,Escherichia coli and Bacillus subtilis as indicator strains to observe and analyze the inactivation.By analyzing the experimental data,it is found that Bacillus subtilis is harder to remove than E.coli due to its strong resistance to spores at the same dose.Inactivation of Bacillus can be approximately representative of the total removal of bacteria in water samples.The 6 lights were all opened.When the hydraulic retention time was 11.5s,the ultraviolet radiation amount reached 50.72mJ/cm2,the Escherichia coli removal rate was 100%,and the bacterial removal rate reached 99%.At this time the water quality reached the "sanitary standard for drinking water",so the dose was considered the best ultraviolet dose for the disinfector to disinfect drinking water.In addition,due to the increase of the polished aluminum reflector,the disinfection time has been reduced by about 1/3 compared with the non-aluminum plate,and it has played a role in improving efficiency and saving energy.By determining the optimum parameters of the sterilizer,the size and structure of the disinfector used in the test are optimized.And then based on the best parameters,9 types of sterilizers for different treatment scale were designed,which made up for the defects of the existing sterilizers on the market and provided users with various choices.This design is carried out in the BIM information family,which realizes the information of product parameters and the three-dimensional model of the model.The family document contains all the information of the sterilizer,including size,material,model,installation location,etc.At any time,different size sterilizer models can be quickly created by modifying parameters,and as modules inserted into the overall project design,making data viewing and management more intuitive and convenient,and the efficiency is greatly improved in practical engineering applications.Finally,the UV disinfection system of a water treatment plant with a capacity of 9600 m3/d was designed with the series of DR-40 sterilizers. |
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