Experimental Study on Sewage Purification Based on Freezing-Microwave Method
In order to explore the effect of freezing-microwave method for purifying sewage quality,this study designed an experiment of in-door freezing wastewater,combined with microwave rapid thawing,and the melted water was collected at five times intervals(i.e.T1～T5).The results show that:① The microwave thawing of 17 min can completely melt the sewage ice,and the efficiency is much higher than that of the natural thawing process(14.5 h).② The microwave treatment of the first 8 min(T1+T2)melts 40%of the total water and removes more than 59.18%of the physical and chemical index content and 64.57%ion content in the sewage.The chromaticity,turbidity and yellow flocculent precipitation of sewage were significantly reduced.③ In the final aquatic products obtained by microwave thawing for 17 min,the concentration ratio of total alkalinity,HPO3,PO43-,CODMn,SiO2 and H2SiO3 is between 0.20 and 0.41,and the maximum concentration ra-tio of TDS to total hardness is only 0.16.The concentration ratio of eight conventional ions in K+,Na+,Ca2+,Mg2+,Cl-,SO42-,HCO3-and NO3-wastewater is only between 0.05 and 0.20.The concentration of As is close to 0.④ The results of principal component analysis(PCA)showed that the purification effect of TDS and total anions was the best when freezing-microwave method was used to purify sewage water,and the principal component comprehensive scores Y were 4.55 and 3.65,respectively.In general,combined with freeze-thaw process and microwave rapid thawing,sewage treatment can be realized quickly and efficiently.
microwavepurification of sewagefreeze thawingconcentration ratioremoval rate
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