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- Title
CaCO<sub>3</sub>结晶对束丝藻水华原水的同步控藻除嗅.
- Authors
王奕睿; 聂小保; 封汇川; 万俊力; 肖达峰; 肖辉毅; 隆院男; 蒋昌波
- Abstract
In order to achieve the simultaneous removal of Aphanizomenon gracile and its associated odor compounds, 2-methylisoborneol (2-MIB), CaCO3 crystallization was used to deal with Aphanizomenon gracile-containing raw water. The effect of Ca2+ dosage on the synchronous removal effectiveness of cells and 2-MIB was investigated, and microscopic examination, Zeta potential and XRD analysis of crystalline products were performed to elucidate the simultaneous control mechanism. The results show that the removal of Aphanizomenon gracile by CaCO3 crystallization was mainly based on the sweeping flocculation of crystalline particles and their aggregates, while of 2-MIB induced by adsorption and electric neutralization. Under the experimental conditions, the maximum removal rates of cells and 2-MIB were (93.7%±1.7%) and (82.0%±4.7%), respectively. With the increase of Ca2+ dosage, the pH value of the clear liquid decreases, which resulted in shift of the ζ potential of the crystalline product from negative to positive, and consequent removal enhancement of 2-MIB and turbidity substances. With 3 mg/L polyaluminum chloride coagulation after CaCO3 crystallization, the removal rates of 2-MIB and turbidity substances were significantly improved. The crystalline form of CaCO3 in algae-containing water is calcite, which mainly aggregates on the surface of cells. The research results provide a new idea for simultaneous removal of algal and odor in Aphanizomenon gracile blooming raw water.
- Subjects
ZETA potential; APHANIZOMENON; POLYALUMINUM chloride; PLANKTON blooms; CRYSTALLIZATION; COAGULANTS; FLOCCULATION; COAGULATION
- Publication
Environmental Science & Technology (10036504), 2022, Vol 45, Issue 3, p197
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.2405.21.338