基于聚己内酯的固相反硝化工艺处理低碳污水动力学特性及经验模型  

Kinetic Characteristics and Empirical Model of Solid-phase Denitrification Process Based on Polycaprolactone for Low Carbon Wastewater Treatment

作　　者：吴恒 赵茜 李汶鸿 王嘉祺 李安洁 郑钧美 王佳文 姚义清 WU Heng;ZHAO Qian;LI Wenhong;WANG Jiaqi;LI Anjie;ZHENG Junmei;WANG Jiawen;YAO Yiqing(School of Mechanical and Electronic Engineering,Northwest A&F University,Yangling 712100,China;Forestry College,Northwest A&F University,Yangling 712100,China;School of Food Science and Engineering,Northwest A&F University,Yangling 712100,China;School of Grassland and Grassland,Northwest A&F University,Yangling 712100,China;School of Life Sciences,Northwest A&F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学机械与电子工程学院,陕西杨凌712100 [2]西北农林科技大学林学院,陕西杨陵712100 [3]西北农林科技大学食品科学与工程学院,陕西杨陵712100 [4]西北农林科技大学草业与草原学院,陕西杨陵712100 [5]西北农林科技大学生命科学学院,陕西杨陵712100

出　　处：《安全与环境工程》2023年第4期262-268,共7页Safety and Environmental Engineering

基　　金：陕西省高层次人才引进计划青年项目(A279021901);陕西省留学人员科技活动择优资助项目(2020002);陕西省重点研发计划项目(2020NY-114)。

摘　　要：经验模型是指导固相反硝化(solid-phase denitrification,SPD)工艺进行应用的重要理论基础,完善其相关理论体系有助于指导实际应用。采用批式试验研究了基于聚己内酯(polycaprolactone,PCL)的SPD工艺硝化反硝化动力学性能、碳源静态释放性能,并基于Eckenfelder方程推导出经验模型。结果表明:基于PCL的SPD工艺的硝化速率为1.317g NH^(+)_(4)-N/(g VSS·h),反硝化速率为2.650 NO^(-)_(3)-N/(g VSS·h),总的反硝化性能优于硝化性能;该工艺在启动初期碳源快速释放导致化学需氧量(chemical oxygen demand,COD)值达到最高,工艺运行过程中不存在碳源释放超标的问题;COD浸出规律符合方程y_(0)=-23.32lnx_(0)+104.46;该工艺连续运行过程符合一级动力学方程y=48.723e^(0.083x),引入碳源模型常数n=2.2719,基于此获得的SPD工艺经验模型为ln(S_(e)/S_(0))=-615.55·H/(qS_(0)^(2.2719));该模型预测值与实测值的最大相对误差为15.8%,模型灵敏度分析显示,NO^(-)_(3)-N浓度在60 mg/L以内时模型灵敏度较高,对于工艺实际应用具有一定的指导意义。The empirical model is the basis for the practical application of the solid-phase denitrification(SPD) process,and improving its theoretical system is helpful to guide the application.The kinetic characteristics and empirical model of the SPD process based on polycaprolactone(PCL) are studied and verified.The results show that the specific ammonium oxidation rate of the SPD process is 1.317 NH~+_4-N/(g VSS·h),the specific denitrification rate is 2.650 NO~-_3-N/(g VSS·h),and the denitrification performance of the SPD system is better than that of nitrification.The chemical oxygen demand(COD) released from PCL is the highest at the initial stage of the SPD process start-up,and there is no excessive COD during operation.COD leaching trend conforms to the kinetic equation:y_0=-23.32lnx_0+104.46,and the continuous operation process conforms to the kinetic equation:y=48.723e~(-0.083x).The carbon source constant n(2.271 9) is introduced in the empirical model.The empirical model is ln(S_e/S_0)=-615.55·H/(qS_0~(2.2719)).The maximum error of this model is 15.8%.This research provides a theoretical basis for the practical application of the SPD process.

关 键 词：低碳污水处理 固相反硝化工艺 聚己内酯 固体碳源 硝化反硝化动力学特性 经验模型 

分 类 号：X703[环境科学与工程—环境工程]