Distribution and Migration Change Law of Particles in Water Purification Process
As one of the potential pollutants,particles are currently threatening the safety of water supply.Based on the actual operation of the water treatment plant and the pilot test data,this paper started with the distribution and migration of particles in the potable water treatment unit,explored the seasonal variation of the quantity and granulometric distribution of particles.Thermal gravimetric analyzer and Fourier ion cyclotron resonance mass spectrometer were used to investigate the changes in the composition of particles along the process.It was found that the quantity and components of particles in the raw water changed seasonally,the particles concentration in summer was significantly higher than that in winter.In terms of the composition of particulate matter,peptides were more abundant in summer,and nitrogen-containing organic matter was rich in lipids and protein in winter;The proportion of particles with different sizes changed slightly during the process,mainly less than 5 μm,of which 2～5 μm accounted for the highest proportion,and the proportion of large particle size particles greater than 20 μm was very small.Coagulation and sedimentation process is the main removal unit for particles,the sand filter as the last line of defence,the ability of activated carbon filter to remove the number of particles is unstable,but it shows a good performance in reducing the content of organic matter attached to the particles.
particle concentrationseasonal variationSouth-to-North Water Diversionconcentration of organic matterparticle size distribution
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