十二烷基苯磺酸钠(SDBS)-氢氧化钠耦合污泥脱水技术研究

INFLUENCE OF COMBINATION SODIUM DODECYL BENZENE SULFONATE(SDBS) AND AKALINE PRETREATMENT ON SLUDGE DEWATERABILITY

研究了十二烷基苯磺酸钠(SDBS)-氢氧化钠(NaOH)耦合预处理对污泥特性的影响,分析了不同预处理条件下污泥溶解性化学需氧量(SCOD)、挥发性悬浮物(VSS)、总悬浮物(TSS)和有机酸溶出率随时间的变化规律,并进一步探讨了其对污泥脱水性能的影响.结果表明,SDBS-NaOH耦合作用时能有效地加速VSS和TSS的溶解,提高污泥水解相SCOD的浓度,当SDBS和NaOH的投加量分别为0.02g·g-1污泥(污泥干基,下同)和0.1g·g-1污泥时,VSS溶解效率高达64.0%,此时TSS含量最低,仅为23.2mg·l-1;另外,当SDBS和NaOH添加量分别为0.02和0.25g·g-1时,污泥的脱水性能良好,脱水后污泥的含水率可降到72%左右,而未预处理的污泥其含水率高达84%。

The influence of combination sodium dodecyl benzene sulfonate（SDBS） and alkaline（NaOH） in sludge pretreatment on sludge dewaterability was inspected,and through the changes of soluble chemical oxygen demand（SCOD）,volatile suspended solid（VSS）,total suspended solid（TSS） and volatile fatty acids（VFAs）,the related mechanism was explored.It was found that the combination of SDBS and NaOH accelerated the solubilization of VSS and TSS,leaded in the dramatic increase in SCOD and VFAs in liquor.When the addition of SDBS and NaOH were 0.02g·g-1 sludge（dry basis） and 0.1g·g-1,respectively,the 64.0% of VSS dissolved with the lowest TSS concentration of 23.2mg·l-1 in liquor.Furthermore,it should be pointed out that when the addition were 0.02g·g-1 and 0.25g·g-1 for SDBS and NaOH,respectively,the moisture content of dewatered sludge could reduce to approximately 72%,however corresponding 84% for unconditioned sludge.