水力空化联合臭氧氧化协同促进剩余污泥溶胞

SYNERGETIC PRETREATMENT OF EXCESS SLUDGE BY ENHANCING SLUDGE LYSIS BY HYDRODYNAMIC CAVITATION COMBINED WITH OZONATION

为有效提高剩余污泥溶胞效率并减少剩余污泥产量,采用水力空化与臭氧反应相结合的方法促进剩余污泥溶胞。系统探究了二者协同作用下剩余污泥的减量效果、有机质的释放、胞外聚合物(EPS)的解聚,分析污泥形态结构和各类溶解性有机物的变化趋势。结果表明:当臭氧浓度为(160±10)g/m^(3),水力空化联合臭氧处理135 min后,污泥的挥发性悬浮固体和总悬浮固体去除率分别为79.12%和68.55%,DD_(COD)达到90.67%,ρ(NH_(4)^(+)-N)由(3.15±0.07)mg/L增加至(42.75±0.21)mg/L,蛋白质和多糖总量分别提高了627.05%和957.28%。剩余污泥经水力空化联合臭氧氧化处理后,粒度扫描和显微镜观察结果表明其颗粒较原泥显著变小;三维荧光结果显示该方法可有效增强污泥溶胞效果,在促进污泥溶胞和减量方面表现出显著的协同效应。

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/m^(3) and 135 min,the removal rates of VSS and TSS reached 79.12%and 68.55%,respectively,DD_(COD) reached 90.67%,NH_(4)^(+)-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.