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以腈纶废水生化出水为原水,采用小角度激光散射技术分析了聚硅酸铁(PSF)的絮凝特性,并考察了PSF投加量、p H值对絮体的生长、破碎与再凝聚过程中絮体平均粒径的影响。结果表明,在絮体生长过程中,絮体粒径随着PSF投加量的增加先增大后减小;反应体系p H值接近中性时,粒径最大。当PSF投加量为1.5 g/L、反应体系p H值为7.6时,平均粒径最大(890μm)。在破碎和再凝聚过程中,当反应体系p H值为7.6时,絮体强度随着PSF投加量的增加而增大,随着剪切强度的增大而减小。当PSF投加量为2.0 g/L、转速为75 r/min时,絮体破碎因子为2.78%。当PSF投加量为1.5 g/L时,反应体系p H值越低,絮体强度越大,在p H值为4.5时,絮体破碎因子为55.43%。在PSF投加量为1.5 g/L、p H值为7.6条件下,破碎时间越短,絮体恢复能力越强,以200 r/min转速对其进行1 min的破碎试验,絮体恢复因子为26.06%。
The flocculation properties of polysilicate iron (PSF) were analyzed by using small-angle laser light scattering technology with raw water from biochemical effluent of acrylic fiber wastewater. The effects of PSF dosage and p H value on the floc growth, fragmentation and reagglomeration Effect of floc size average particle size. The results showed that the particle size of flocs first increased and then decreased with the increase of the dosage of PSF during the floc growth. When the pH of the reaction system was close to neutral, the particle size was the largest. When the dosage of PSF is 1.5 g / L and the p H value of the reaction system is 7.6, the average particle size is the largest (890 μm). In the process of crushing and reagglomerating, when the p H value of the reaction system is 7.6, the floc strength increases with the increase of PSF dosage and decreases with the increase of shear strength. When the dosage of PSF was 2.0 g / L and the rotating speed was 75 r / min, the floc breakage factor was 2.78%. When the dosage of PSF is 1.5 g / L, the lower the value of p H is, the higher the floc strength is. When the pH value is 4.5, the floc break factor is 55.43%. When the PSF dosage was 1.5 g / L and p H value was 7.6, the shorter the crushing time was, the stronger the flocculation ability was. The crushing time was 1 min at 200 r / min, and the floc recovery factor 26.06%.