摘要
为处理未纳入管网的市政污水,采用石英砂加载混凝工艺,考察石英砂的粒径及其投加量对处理效能的影响,分析了溶解性有机物(dissolved organic matters, DOM)的去除特征,并探讨了石英砂加载混凝机理。结果表明,与常规混凝相比,当石英砂的粒径和投加量分别为200目和1.0 mg/L时,石英砂加载混凝工艺对污水中浊度、COD的去除率分别为97.55%、59.2%,优于常规混凝;石英砂加载混凝工艺可明显去除芳香类、共轭双键、疏水性有机物,主要促进了腐殖质类物质的削减;石英砂通过架桥作用增加了絮体的密度,进而显著改善了絮体的沉降性能、强度;絮体的沉降性能、强度及再稳性能随着石英砂粒径的降低而升高。
In order to treat municipal wastewater not included in the pipe network, silica sand loading coagulation process was adopted. The effects of particle size and dosage of silica sand on the treatment efficiency were investigated, the removal characteristics of dissolved organic matters(DOM) were analyzed, and the coagulation mechanism was discussed. The results show that when the particle size and dosage of silica sand are 200 mesh and 1.0 mg/L, respectively, the removal rates of turbidity and COD by silica sand loading coagulation are 97.55% and 59.2%, respectively, which are better than the conventional coagulation. The aromatic, conjugated double bond and hydrophobic organic matter can be obviously removed by silica sand loading coagulation, which mainly promotes the reduction of humus. Through bridging, silica sand increases the density of flocs, and then significantly improves the settlement performance and strength of flocs. The settling property, strength and re stability of flocs increase with the decrease of silica sand particle size.
作者
李晨璐
郭雅妮
郑利兵
焦赟仪
张鹤清
吴振军
黄国华
王哲晓
魏源送
LI Chenlu;GUO Yani;ZHENG Libing;JIAO Yunyi;ZHANG Heqing;WU Zhenjun;HUANG Guohua;WANG Zhexiao;WEI Yuansong(Water Pollution Control Laboratory,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;School of Environmental and Chemical Engineering,Xi\an Polytechnic University,Xi\an 710048,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Huanneng Technology Co.,Ltd.,Chengdu 610045,China)
出处
《水资源保护》
CAS
CSCD
北大核心
2021年第4期148-155,共8页
Water Resources Protection
基金
国家水体污染控制与治理科技重大专项(2017ZX07102-002)
国家自然科学基金青年科学基金(51908539)。
关键词
石英砂加载混凝工艺
市政污水
溶解性有机物
紫外可见光谱
三维荧光光谱
腐殖质
silica sand loading coagulation
municipal wastewater
dissolved organic matters
UV-Vis spectrum
three-dimensional excitation-emission matrix
humus