颗粒物对混凝过程及超滤膜污染的影响

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Abstract Taking nm-SiO₂ and μm-SiO₂ systems as the research objects, the coagulation-ultrafiltration experiments were carried out using three coagulants with different Al forms (AlCl₃, Al₁₃ and Al₃₀) to investigate the removal rate of SiO₂, the residual Al and coagulation pretreatment on membrane flux at different pH values. The properties of flocs and their distribution and interaction on the ultrafiltration membrane surface were characterized by Malvern laser particle sizer, SEM, BET and AFM. The results showed that the removal rate of SiO₂ in the nm-SiO₂ system was lower than that in the μm-SiO₂ system. The membrane flux was increased from 0.68 to 0.96 (AlCl₃), 0.86 (Al₁₃) and 0.87 (Al₃₀), respectively, after adding coagulants to the nanoparticle system. The membrane flux increased from 0.79 to 0.80~0.84 after adding three coagulants to the micron particle system. Micron-sized particles are collisions between particles, while nano-sized particles mainly collide in the form of agglomerates. The particle size of flocs formed by oligomeric aluminum(Al_a) and particles are all larger than 150μm, and the zeta potential of the system is negative to generate repulsion with the membrane surface. Under neutral conditions, the strength factor of Al₁₃ and particulate matter forming floc is much higher than that of AlCl₃ and Al₃₀. Intermediate aluminum(Al_b) transfers the irreversible membrane fouling formed by the clogging of smaller particles inside the membrane pores to reversible membrane fouling on the surface of the membrane pores. Polymeric aluminum(Al_c) has strong adsorption bridging and net sweeping ability, and the small amorphous and irregular agglomerated particles form larger flocs in this process to alleviate membrane fouling.

Key words： particulate morphology Al morphology flocs coagulation-ultrafiltration membrane fouling

Received: 25 March 2022

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X703.5

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	Articles by authors
	WANG Zi-jie
	XU Hui
	YU Jun-jie
	ZHAO Chuan-liang
	WANG Dong-sheng

Cite this article:

WANG Zi-jie,XU Hui,YU Jun-jie等. Effect of particulate matter on coagulation process and ultrafiltration membrane contamination[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4621-4630.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4621

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