摘要:
分别在臭氧浓度为31.50,31.96,32.23,33.89,36.65,39.33和40.25mg·l-1下,考察污泥混合液MLSS,MLVSS和pH值及上清液SCOD,TN,NH3-N和TP等随臭氧作用时间的变化.结果表明:臭氧对污泥混合液中的溶解性固体(DS)具有氧化作用,能有效破解微生物絮体、细胞壁和细胞膜等,使微生物体内有机质溶出,溶出物能被微生物作为底物重新利用,本实验中,MLSS和MLVSS降低最大量分别为1250 mg·l-1和465 mg·l-1,SCOD增加最大量为250.3 mg·l-1.另外,根据混合液各性状的变化规律分析了臭氧氧化污泥的机理.
Abstract:
The experiment was operated to investigate the effects of ozone treatment on activated sludge characters,which inspected the variation of MLSS,MLVSS,SCOD,TN,NH3-N,TP and pH by ozonation time at different ozone concentration: 31.50 mg·l-1,31.96 mg·l-1,32.23 mg·l-1,33.89 mg·l-1,36.65 mg·l-1,39.33 mg·l-1 and 40.25 mg·l-1.The results showed that ozone is a strong oxidant which can oxidize the DS of activated sludge,disintegrate zoogloeas,cell wall and cell membrane causing the SCOD to increase because of microorganism dissolution.The sludge mixture can be easily used by microbe if return back to aeration tank,therefore,the production of the activated sludge process will reduce by improving the cryptic growth.We also found that the MLSS,MLVSS decrease mostly by 1250 mg·l-1 and 465 mg·l-1 at distinction,and SCOD increase mostly by 250.3 mg·l-1.The mechanism of sludge ozonation is analyzed furthermore according to the experiment.
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