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| Efficiencies and mechanism analysis of HCA strengthening coagulation on pretreatment of domestic sewage |
| YAN Zi-chun, TAO Ren-qian |
| School of environment and municipal engineering, LanZhou JiaoTong University, Lanzhou 730070, China |
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Abstract The single factor and orthogonal experiments were carried out to enhance coagulation pretreatment of simulation of rural domestic sewage used by Poly Dimethyl Diallyl Propy Ammoniuml Chloride (HCA) as a coagulant,meanwhile the removal sequence of HCA and main factors were also analyzed on the removal effect of SS,TP and organic matter by HCA. Meanwhile the coagulation mechanism of HCA was analyzed through the Zeta potential and fractal dimension. The results showed that the influence factors of HCA treatment effect was in as a order of the initial pH value > HCA dosage > flocculation stirring time > mixed speed gradient > blend stirring time > flocculation stirring speed gradient, and under the optimized conditions, SS, TP and COD removal rates were up to 94.1%, 74.9% and 61.1%, respectively; when the dosage of HCA was 15mg/L, Zeta potential and the fractal dimension of flocs was -2.03mv and 1.0149, respectively. The analysis of the experimental results showed that the HCA of sewage treatment had obvious effect and its mechanism was mainly charge neutralization.
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Received: 03 April 2018
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