Pulse Water-lifting Aeration Bio-contact Oxidation Process for Purification of Micro-polluted Water

A pulse aeration bio-contact oxidation process was used to treat urban riverway water in lab-scale test.The optimal process parameters are as follows;the aeration intensity is4m~3/(m~2 ? h), the HRT is 2 h,the ratio of non-aeration to aeration is 6:4 to 8:2,and the aeration period is equal to or less than 2 min.The average removal rates of NH_4~+- N and COD——(Mn) are 78.30%to 93.51%and 21.12%to 24.29%respectively.The biomass on bio-media is 265.53 to 938.63 nmol/m~3.The effect of pulse aeration bio-contact oxidation process is better than that of continuous aeration bio-contact oxidation process.The pulse aeration bio-contact oxidation process saves 60%to 80%air volume compared with continuous aeration bio-contact oxidation process.A pulse water-lifting aeration in-situ water quality purification device was developed by combining water-lifting aeration with biological contact oxidation. The pilot study results show that the average removal rates of NH——4~+- N,TN and COD——(Mn) are 55.13%, 18%and 10%respectively when the water temperature is less than 15℃.