SYNERGETIC PRETREATMENT OF EXCESS SLUDGE BY ENHANCING SLUDGE LYSIS BY HYDRODYNAMIC CAVITATION COMBINED WITH OZONATION
This study intends to effectively improve the efficiency of sludge lysis and reduce the yield of excess sludge through hydrodynamic cavitation combined with ozone.To reveal the synergism of hydrodynamic cavitation/O3 treatment,a suite of analysis was implemented:sludge concentration,the content of organic matter,the destruction and three-dimensional excitation-emission matrix spectra of EPS,the particle size of sludge flocs and microphotograph of sludge.When the ozone concentration and operation time was(160±10)g/m3 and 135 min,the removal rates of VSS and TSS reached 79.12％and 68.55％,respectively,DDCOD reached 90.67％,NH4-N increased from(3.15±0.07)mg/L to(42.75±0.21)mg/L,total protein and polysaccharide content in the sludge supernatant increased by 627.05％and 957.28％,respectively.From the change of particle size distribution of sludge and the observation of floc structure under the microscope,it was concluded that the particles of sludge flocs are significantly smaller than the raw sludge,by pretreatment of hydrodynamic cavitation combined with ozonation.The analysis of three-dimensional fluorescence results showed that this method enhanced the effect of sludge lysis and the hydrodynamic cavitation/O3 pretreatment showed a significant synergistic effect in enhancing sludge lysis.
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