[1]姚昊,许航,温昕,等.预臭氧氧化对混凝沉淀过程中有机物去除的影响[J].中国给水排水,2022,38(7):33-42.
　YAOHao,XUHang,WENXin,et al.Effect of Pre-ozonation on Removal of Organic Matter during Coagulation and Sedimentation[J].China Water & Wastewater,2022,38(7):33-42.
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预臭氧氧化对混凝沉淀过程中有机物去除的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第7期 页码: 33-42 栏目: 出版日期: 2022-04-01
Title:
Effect of Pre-ozonation on Removal of Organic Matter during Coagulation and Sedimentation
作者:
姚昊1,2， 许航1,2， 温昕1,2， 王月婷1,2， 陈佳佩1,2， 张茜1,2
（1.河海大学 浅水湖泊综合治理与资源开发教育部重点实验室，江苏 南京 210098；2.河海大学 环境学院，江苏 南京 210098）
Author(s):
YAO　Hao1，2， XU　Hang1，2， WEN　Xin1，2， WANG　Yue-ting1，2， CHEN　Jia-pei1，2， ZHANG　Qian1，2
（1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes ， Hohai University， Nanjing 210098， China； 2. College of Environment， Hohai University， Nanjing 210098， China）
关键词:
溶解性有机物;  预臭氧氧化;  混凝沉淀;  液相色谱-有机碳检测仪;  傅里叶变换离子回旋共振质谱仪
Keywords:
dissolved organic matter;  pre-ozonation;  coagulation and sedimentation;  LC-OCD;  FT-ICR MS
摘要:
考察了臭氧强化混凝沉淀对溶解性有机物（DOM）去除的影响，针对长荡湖原水、直接沉后水、预臭氧出水和臭氧沉后水四种水样，利用液相色谱-有机碳检测仪（LC-OCD）和傅里叶变换离子回旋共振质谱仪（FT-ICR MS）等从不同层面探究DOM的演变。经试验确定，预臭氧和聚合氯化铝（PAC）的最佳投加量分别为1.0、30 mg/L，并在此工况下进行研究。原水中主要存在类色氨酸和类富里酸两种有机物，臭氧强化混凝沉淀对有机物的去除效果最好，对类色氨酸、类富里酸和类腐殖酸类物质的去除率分别为80.75%、77.39%、80.28%。经LC-OCD分析，原水中亲水性有机物总浓度最高为3 776.74 ?g/L。臭氧沉后水中腐殖质降解产物增多，其他几类有机物均减少。在小分子DOM中，CHOSP-DOM占比最大，CHOP-DOM占比最小。臭氧强化混凝沉淀对各类分子相对丰度的分布影响最大，峰值出现在C10H10O3（177.06 u）、C13H18O6（269.10 u）和C15H20O7（311.11 u），且质荷比>680的分子分布明显减少。原水经不同工艺处理后，小分子DOM分布范围均变广，并逐渐向高H/C、低O/C转移，各水样中碳水化合物类、不饱和碳氢化合物、单宁酸类和稠环化合物类占比很少，总占比为10.90%~18.25%。四种水样中小分子DOM的DBE平均值分别为6.6、6.5、6.3和6.1，可以看出臭氧对芳香性或不饱和度的降低起关键作用。总体来看，臭氧强化混凝沉淀工艺的处理效果最好，可以降低水厂后续工艺对有机物的处理难度。
Abstract:
The effects of ozonation-enhanced coagulation and sedimentation on the removal of dissolved organic matter (DOM) were investigated, and the evolution of DOM was explored from different levels by using LC-OCD and FT-ICR MS techniques for four water samples of raw water from Changdang Lake, coagulation and sedimentation effluent, pre-ozonation effluent and ozonation-enhanced coagulation and sedimentation effluent. The optimal dosage of ozone and polyaluminum chloride (PAC) was determined to be 1.0 mg/L and 30 mg/L, respectively, and the following experiment was carried out under this optimal condition. There were mainly two kinds of organic compounds in the raw water, namely tryptophan-like and fulvic acid-like. The removal effect of organic compounds by the ozonation-enhanced coagulation and sedimentation was the best, and the removal rates of tryptophan, fulvic and humic acids were 80.75%, 77.39% and 80.28%, respectively. LC-OCD analysis indicated that the highest total concentration of hydrophilic organic compounds in the raw water was 3 776.74 ?g/L. The concentration of building blocks in the effluent of ozonation-enhanced coagulation and sedimentation increased, whereas the concentrations of other organic substances decreased. Among small molecular DOM, the proportion of CHOSP-DOM was the largest, and the proportion of CHOP-DOM was the smallest. Ozonation-enhanced coagulation and sedimentation had the greatest effect on the distribution of relative abundance of various molecules. The peaks appeared in C10H10O3 (177.06 u), C13H18O6 (269.10 u) and C15H20O7 (311.11 u), and the distribution of molecules with mass-to-charge ratio greater than 680 decreased significantly. The distribution range of small molecular DOM in raw water treated by different processes became wider, and gradually transferred to high H/C and low O/C substances. Carbohydrates, unsaturated hydrocarbons, tannins and thick cyclic compounds accounted for a small proportion in each water sample, and the total proportion was 10.90%-18.25%. The DBE average values of small molecular DOM in four water samples were 6.6, 6.5, 6.3 and 6.1, respectively, indicating that ozone played a key role in reducing aromatics or unsaturation. In general, the treatment performance of ozonation-enhanced coagulation and sedimentation process was the best, which could reduce the difficulty of organic matter treatment in the subsequent process of waterworks.

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更新日期/Last Update: 2022-04-01