Synthesis and application of polymerized Al-Ti based flocculant

doi:10.11949/0438-1157.20231209

Abstract

Abstract:

Polyaluminum titanium based flocculant is a new type of composite polymer flocculant, its effect is better than that of aluminum salt flocculant and titanium salt coagulant. The preparation method of composite flocculants has always been slow dropping alkali method, and electrodialysis method is a new preparation method. Electrodialysis can precisely regulate the hydrolysis polymerization of Al³⁺ and Ti⁴⁺ with OH^- microinterface process, so as to obtain hydroxyl polymers with flocculating effect. In order to further understand the preparation mechanism of flocculant and the differences between the two preparation methods. First, the hydrolytic morphology distribution and physicochemical properties of the two flocculants were compared by Ferron time by time complexation colorimetry, FTIR, SEM and Zeta potential. It was found that the medium and high polymer content of E-PATC prepared by electrodialysis method was 3.89% higher than that of S-PATC prepared by slow dropping alkali method, and the Zeta potential was 8.9 mV higher, which indicated that the electric neutralization and sweeping capacity of E-PATC were better than that of S-PATC. Second, the flocculation effect of two kinds of flocculants on Jiazi Lake water and secondary effluent was compared. It was found that the organic removal rate of E-PATC was higher than that of S-PATC in both Jiazi Lake water and secondary effluent. Finally, the floc dynamics of E-PATC was studied. E-PATC had a fast growth rate, a large floc particle size, and was easy to settle. In summary, the flocculation effects of E-PATC and S-PATC are similar, but the floc produced by E-PATC flocculation has a large particle size, is not easily broken, and has better settling properties.

Key words: polyaluminum titanium-based flocculant, coagulate, polymerization, electrochemistry, water treatment

摘要：

聚合铝钛基絮凝剂是一种新型的高分子聚合絮凝剂，研究证明其具有铝盐絮凝剂有机物去除效率高、成本低的优点，也具有钛盐混凝剂低毒性、生物相容性和沉降性能好的优点。研究通过慢速滴碱法与电渗析法制备了两种聚合氯化铝钛絮凝剂（PATC），对两种不同制备方法的PATC进行了絮凝剂结构、絮凝效果以及絮凝动力学三个方面的研究。实验结果表明E-PATC的中、高聚体比S-PATC多3.89%，Zeta电位高8.9 mV。对两者的絮凝动力学进行了对比，发现E-PATC的生长速度快，絮体粒径大，易沉降。综上，E-PATC与S-PATC的絮凝效果相差不大，但E-PATC絮凝产生的絮体粒径大，不易破碎，具有更好的沉降性。

关键词: 聚合铝钛基絮凝剂, 混凝, 聚合, 电化学, 水处理

CLC Number:

TQ 028.8

Na PAN, Chang TIAN, Lankun HUAI, Yuyu LIU, Fenfen ZHANG, Xiaomei GAO, Wei LIU, Liangguo YAN, Yanxia ZHAO. Synthesis and application of polymerized Al-Ti based flocculant[J]. CIESC Journal, 2024, 75(3): 1009-1018.

潘娜, 田昌, 怀兰坤, 刘玉玉, 张芬芬, 高晓梅, 刘伟, 闫良国, 赵艳侠. 聚合铝钛基絮凝剂的合成与应用[J]. 化工学报, 2024, 75(3): 1009-1018.

Figures/Tables 7

Table 1 Physical and chemical characteristics of experimental water samples

实验用水	浊度(NTU)	UV₂₅₄/cm^-1	pH	Zeta电位/mV
二级出水	1.05±0.32	0.080 ± 0.008	8.08 ± 0.39	-5.98 ± 1.72
甲子湖水	4.38±0.29	0.115 ± 0.008	8.19 ± 0.05	-13.53 ± 1.59

Fig.1 Ferron complex curve and hydrolytic morphology of S-PATC and E-PATC

Fig.2 The FTIR, Zeta potential and SEM analysis of PATC

Fig.3 The removal rate of organic matter and Zeta potential after flocculation of Jiazi Lake water by S-PATC and E-PATC

Fig.4 Removal rate of organic matter and Zeta potential after flocculation of secondary effluent by S-PATC and E-PATC

Fig.5 Floc particle size of S-PATC and E-PATC at B= 0.5, n(Ti)/n(Al)=1

Table 2 Floc parameters under S-PATC and E-PATC at B=0.5， n（Ti）/n（Al）=1

絮凝剂	$n (T i) n (A l)$	d₁/μm	d₂/μm	d₃/μm	生长速率/ (μm/min）	S_f /%	R_f /%	D_f
絮凝剂	$n (T i) n (A l)$	d₁/μm	d₂/μm	d₃/μm	生长速率/ (μm/min）	S_f /%	R_f /%	破碎前	破碎后	再生后
S-PATC	1	1371.20	596.00	583.20	467.67	43.47	无再生现象	2.2585	2.4406	2.414
E-PATC	1	1604.84	979.00	1055.34	774.25	67.5	46.9	2.0154	1.9925	2.2551

Table 2 Floc parameters under S-PATC and E-PATC at B=0.5， n（Ti）/n（Al）=1

絮凝剂	$n (T i) n (A l)$	d₁/μm	d₂/μm	d₃/μm	生长速率/ (μm/min）	S_f /%	R_f /%	D_f
絮凝剂	$n (T i) n (A l)$	d₁/μm	d₂/μm	d₃/μm	生长速率/ (μm/min）	S_f /%	R_f /%	破碎前	破碎后	再生后
S-PATC	1	1371.20	596.00	583.20	467.67	43.47	无再生现象	2.2585	2.4406	2.414
E-PATC	1	1604.84	979.00	1055.34	774.25	67.5	46.9	2.0154	1.9925	2.2551

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