摘要
【目的】利用混凝强化一级处理捕获有机碳来产酸、产甲烷是资源化的有效技术,但城市污水有机物组成复杂,对不同形态有机物的捕获特征缺乏系统清晰的认知。【方法】因此,分析城市污水中有机物形态与化学组成特征,筛选常用混凝剂并通过响应面法确定最佳混凝条件,最后分析混凝对污水有机碳的捕获效果。【结果】结果表明,城市污水中有机物不同形态化学需氧量(COD_(Cr))组成为:颗粒态(68.7%±2.1%)>胶体态(17.1%±1.9%)>低分子质量溶解态(12.7%±0.2%)。絮凝剂+聚丙烯酰胺(polyacrylamide,PAM)的组合相较于单一絮凝剂、絮凝剂+活性污泥组合有较好的捕获效果。聚合氯化铁+PAM对有机碳的捕获率为68.5%±2.6%,其中对各形态的有机物捕获能力为:颗粒态(88.6%±4.3%)>胶体态(48.5%±11.2%)>低分子质量溶解态(6.7%±1.5%)。从类别看对低分子质量中碳氢化合物类、稠环芳烃类等不饱和物的捕获率最高。从元素组成看,对仅含C、H、O 3种元素组成的溶解态有机物更易捕获。【结论】总之,颗粒态有机物占城市污水主要部分,絮凝主要捕获颗粒态有机物和大分子溶解态不饱和的有机物。
[Objective]Using coagulation-enhanced primary treatment to capture organic carbon for acid and methane production is an effective resource recovery technique.However,the organic composition of municipal wastewater is complex,and there is a lack of systematic and clear understanding of the capture characteristics of different organic forms.[Methods]Therefore,this study analyzed the forms and chemical compositions of organic substances in municipal wastewater,selected common coagulants,determined optimal coagulation conditions using response surface method ology,and finally assessed the coagulation′s effect on capturing organic carbon in wastewater.[Results]The result showed that the composition of different forms of chemical oxygen demand(COD_(Cr))in organic matter in municipal wastewater was as follows:particulate(68.7%±2.1%)>colloidal(17.1%±1.9%)>ow molecular weight(12.7%±0.2%).The combination of flocculant+polyacrylamide(PAM)had a better capture effect than that of a single flocculant,flocculant and activated sludge combination.The capture rate of organic carbon was 68.5%±2.6%by polyferric chloride+PAM,and the capture capacity of organic matter in various forms was as follows:particulate state(88.6%±4.3%)>colloidal state(48.5%±11.2%)>low molecular weight dissolved state(6.7%±1.5%),and the capture rate of unsaturated substances such as hydrocarbons and fused cyclic aromatic hydrocarbons in low molecular weight was the highest in terms of category.In terms of elemental composition,it is easier to capture dissolved organic compounds containing only C,H and O elements.[Conclusion]In conclusion,particulate organic matter accounts for the main part of municipal wastewater.Flocculation mainly captures granular organic matter and macromolecular dissolved unsaturated organic matter.
作者
马小平
李彭
王拯
林冰洁
张东
何义亮
MA Xiaoping;LI Peng;WANG Zheng;LIN Bingjie;ZHANG Dong;HE Yiliang(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;School of Environmental Science and Engineering,Shanghai JiaoTong University,Shanghai 200240,China 3.Shanghai city sewage treatment Co.,Ltd.,Shanghai 201203,China;Shanghai city sewage treatment Co.,Ltd.,Shanghai 201203,China;Urban Water Resources Development and utilization<South>National Engineering Research Center,Shanghai 200082,China)
出处
《净水技术》
2025年第3期113-122,178,共11页
Water Purification Technology
基金
上海城投水务(集团)有限公司科研项目(KY.WB.23.001)。
关键词
城市污水
混凝强化一级处理
响应面法(RSM)
傅里叶变换
离子回旋共振质谱
urban wastewater
coagulation-enhanced primary treatment
response surface method(RSM)
Fourier transform
ion cyclotron resonance mass spectrometry
