摘要
餐饮废水是一种污染严重、成分复杂的高浓度有机废水。为了降低生化处理的负荷,采用混凝沉淀工艺对餐饮废水进行预处理,利用响应面法优化混凝工艺条件。通过扫描电子显微镜(SEM)、X射线能谱(EDS)及X射线衍射(XRD)分析絮体组成结构的变化,采用三维荧光光谱对比餐饮废水处理前后有机物成分的变化,探究餐饮废水的降解机理。结果表明:在初始pH 7.75,FeCl3投加量为101.84 mg/L,搅拌及沉降时间分别为42.05 s和25.99 min的条件下,响应面法预测COD去除率为45.34%,与实测值仅相差0.02%(<2%)。由SEM、EDS及XRD分析可知,混凝前原水的悬浮物表面相对平整,混凝后的沉淀物颗粒表面粗糙,且表面呈空间网状结构;混凝前后废水的絮体主要含有C、Cl、Na、O、N、P等元素;混凝后的絮体表面附着铁的氢氧化物。通过三维荧光分析可知,混凝沉淀工艺能有效地去除可溶性微生物副产物和腐殖酸类物质。
Catering wastewater is a kind of high-concentration organic wastewater with severe pollution and complex components.In order to reduce the load of biochemical treatment,this study uses coagulation sedimentation process to pretreat catering wastewater,and uses response surface methodology to optimize the coagulation process conditions.Scanning electron microscopy(SEM),X-ray energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD)were used to analyze the changes of composition and structure of flocs.Three dimensional fluorescence spectrum were used to compare the changes of organic matter before and after catering wastewater treatment,and the degradation mechanism of catering wastewater was explored.The results showed that when the initial pH was 7.75,FeCl3 dosage was 101.84 mg/L,stirring time was 42.05 s and sedimentation time was 25.99 min,removal efficiency of COD predicted was 45.34%by using the response surface method.The deviation was only 0.02%(<2%)compared with the measured value.According to SEM,EDS and XRD analysis,the surface of suspended solids in the raw water before coagulation was relatively flat.The surface of the precipitate particles after coagulation was rough,and the surface of floc had obvious spatial network structure.The flocs mainly contained C,Cl,Na,O,N,P and other elements before and after the coagulation and the surface of flocs adhered to iron hydroxide after the coagulation.The analysis of three-dimensional fluorescence showed that the coagulation sedimentation process could effectively remove soluble microbial by-products and humic acids.
作者
贾艳萍
单晓倩
宋祥飞
佟泽为
张健
张兰河
JIA Yanping;SHAN Xiaoqian;SONG Xiangfei;TONG Zewei;ZHANG Jian;ZHANG Lanhe(School of Chemical Engineering,Northeast Electric Power University,Jilin 132012,Jilin,China;School of Energy and Power Engineering,Changchun Institute of Technology,Changchun 130012,Jilin,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第9期4931-4940,共10页
CIESC Journal
基金
国家自然科学基金项目(52070035)
吉林省科技发展计划项目(20180201016SF)。
关键词
响应面
餐饮废水
混凝沉淀
模型
降解
response surface
catering wastewater
coagulation sedimentation
model
degradation
