LIJin,ZHANGXian-ming,NIEYu-dong,et al.Effect of Mg2+ and Ca2+ on Removal of Natural Organic Matter by Coagulation with Polymeric Titanium Chloride[J].China Water & Wastewater,2022,38(23):49-55.
Mg2+、Ca2+对聚合氯化钛混凝去除天然有机物的影响
- Title:
- Effect of Mg2+ and Ca2+ on Removal of Natural Organic Matter by Coagulation with Polymeric Titanium Chloride
- Keywords:
- polymeric titanium chloride; natural organic matter; water hardness; coagulation; response surface method
- 摘要:
- 制备了混凝剂聚合氯化钛（PTC），以含腐殖酸水样为处理对象，采用单因素实验研究PTC投加量、pH、Mg2+和Ca2+浓度等对PTC混凝去除天然有机物（NOM）的影响，并进一步通过响应面法分析以上4个因素对混凝效果的交互影响。在单因素实验中，最佳PTC投加量、pH、Mg2+和Ca2+浓度分别为20 mg/L、8、50 mg/L、50 mg/L；根据三维荧光光谱分析，Mg2+对PTC去除有机物的影响不大，而Ca2+对其略有促进作用。通过响应面法计算得出，PTC投加量、pH、Mg2+和Ca2+浓度的最佳值分别为40 mg/L、8.13、70 mg/L、30 mg/L，在此条件下进行实验，剩余浊度可达到0.3 NTU以下，UV254和TOC去除率分别为79.8%和75.3%，与理论预测值无显著性差异；另外，有机物去除效果与无Mg2+和Ca2+存在时相比明显提高。进一步分析表明，在低PTC投加量下吸附电中和为主要混凝机理，在高PTC投加量下网捕卷扫为主要混凝机理。
- Abstract:
- Coagulant polymeric titanium chloride (PTC) was prepared. With the water containing humic acid as treatment object, the single factor experiment was used to study the effects of PTC dosage, pH, and concentrations of Mg2+ and Ca2+ on the removal of natural organic matter (NOM) by PTC coagulation, and the interaction effects of the above four factors on the coagulation performance were analyzed by response surface method. In the single factor experiment, the optimal parameters such as dosage of PTC, pH and concentrations of Mg2+ and Ca2+ were 20 mg/L, 8, 50 mg/L and 50 mg/L, respectively. According to three-dimensional fluorescence spectrum analysis, Mg2+ had little effect on the removal of organic matter by PTC, while Ca2+ slightly improved it. Calculated by response surface analysis, the optimal dosage of PTC, pH and concentrations of Mg2+ and Ca2+ were 40 mg/L, 8.13, 70 mg/L and 30 mg/L, respectively. Under these conditions, the residual turbidity was no greater than 0.3 NTU, and the removal rates of UV254 and TOC were 79.8% and 75.3%, respectively, which were not significantly different from the theoretical predicted values. In addition, the removal efficiency of organic compounds was significantly improved compared with that without the presence of Mg2+ and Ca2+. Further analysis showed that the main coagulation mechanism was adsorption and electric neutralization at low PTC dosage and sweeping at high PTC dosage.
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