响应曲面法优化酸热联合预处理改善污泥脱水性能的研究  

Optimization of Acid-heat Combined Pretreatment to Improve Sludge De-watering Performance Using Response Surface Methodology

作　　者：于晓艳 李玉玉 苏赛赛 杜苏萌 YU Xiaoyan;LI Yuyu;SU Saisai;DU Sumeng(Department of Environmental and Safety Engineering,Taiyuan Institute of Technology,Taiyuan 030008,China;School of Environmental and Resource Science,Shanxi University,Taiyuan 030031,China)

机构地区：[1]太原工业学院环境与安全工程系,山西太原030008 [2]山西大学环境与资源学院,山西太原030031

出　　处：《环境科学与技术》2024年第11期178-184,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目(51608247);来晋工作优秀博士(后)科研资助项目(2022LJ006);博士(后)科研资助项目(2022KJ022)。

摘　　要：该研究通过酸热联合预处理的方式破解污泥絮体结构以改善污泥的脱水性能,同时基于Box-Behnken响应曲面法对污泥脱水模型进行预测并进行参数优化。结果表明,酸热联合预处理可极大地改善污泥的脱水能力,且当pH为1.0、59.2℃加热34.1 min时,污泥的脱水能力最佳,此时泥饼脱水后的含水率为59.0%,污泥比阻SRF为7.48×10^(12)m/kg。酸热联合预处理改善污泥的脱水性能,主要通过大量紧密型胞外聚合物(TB-EPS)转化为溶解型胞外聚合物(S-EPS)和松散型胞外聚合物(LB-EPS)以改变污泥表面的电荷,且TB-EPS蛋白质减少的量近似等于S-EPS和LB-EPS蛋白质增量之和。同时酸热联合作用下污泥颗粒粒径明显增大,而污泥游离氨基酸的种类和浓度对其脱水性能的影响较小。Acid-heat pretreatment was used to improve the sludge dewatering performance by breaking the structure of sludge flocs,and a mathematical model simulated about sludge de-watering capability was obtained,besides the relevant factors were optimized based on the Box-Behnken response surface method.The results showed that acid-heat combined pretreatment could greatly improve the sludge dewatering performance,and it was optimized in the case of a pH of 1.0 and temperature of 59.2℃for 34.1 min,the water content of sludge cake reached as low as 59.0%and SRF was 7.48×1012 m/kg.In terms of mechanism,the acid-heat combined pretreatment improved the de-watering performance of sludge mainly through the conversion of a large amount of tightly bound extracellular polymetric substances(TB-EPS)to soluble extracellular polymetric substances(S-EPS)and loosely bound extracellular polymetric substances(LB-EPS)to change the surface charge of sludge,reducing the amount of protein in TB-EPS,approximately equal to the increasing amount of protein in both S-EPS and LB-EPS.And particle size of sludge greatly enlarged under acid-heat combined pretreatment,but the type and concentra⁃tion of free amino acids in sludge had relatively lesser impact on its dewatering performance.

关 键 词：污泥脱水 表面电荷 酸热耦合 响应曲面法 氨基酸 

分 类 号：X703[环境科学与工程—环境工程]