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Algae water production, water released into the extracellular polymer precursors may generate toxic disinfection byproducts, some extracellular polymer, such as microcystins and Anabaena toxin itself has a liver toxicity and tumor-promoting effect. The large number of algal cells not only consume flocculant, liquid chlorine and other water treatment chemicals, clogged filter increase the backwash water, the serious stench odor also finished water, the impact of open-air structure air - water interface is beautiful. Many studies and actual run conventional water treatment technology algaecide effect poor, about strengthening the technical research has important theoretical and practical values. In this paper, Chlorella (Chlorella vulgaris) is a material, a comprehensive comparison of several commonly used coagulant algaecide effect clay as a coagulant aid through the surface of the physical and chemical processes to remove the raw water algae new ideas. The experimental results show that, first in the coagulation stage dosing 20mg / L of kaolin, 20mg / L PAC 2min after dosing, can improve the floc structure, increasing the density of the flocs, improve algaecide efficiency. Through different biological conditions (continuous light, continuous lack of nutrition) cultured Chlorella, change water physicochemical parameters (water temperature, water pH, KMnO4 and CuSO4 pretreatment wash except loose surface appressorium compounds, fulvic acid and surfactant confirmed the presence of sodium dodecyl benzene sulfonate) and other means combined with PAC and kaolin remove raw water chlorella reliable, environmental and biological impact of the water is small, has broad applicability, suitable for drinking in life promote the field of water treatment applications. The experimental raw water also confirmed to be satisfied with the algaecide effect associated with the PAC and kaolin, has practical value. Ζ potential measurements, it is found that the the adsorption - role of bridging and netting sweeping PAC Coagulation Chlorella mechanism. PDA analyzer the flocculation dynamic characteristics of the various dosing study, analysis of the trends of the floc size with coagulation time according to PDA curve, thereby determining the optimum floc time. The best floc formation sampling scanning electron microscope photographs and fractal dimension, further confirmed from microscopic to join the PAC before kaolin, the floc formed compact structure, dense, and a good role in promoting the coagulation. Finally, according to the results of the previous experiment, the kaolin and PAC associated technical Coagulation algaecide process analog description. Clay rich source of low-cost, non-polluting. Kaolin and PAC associated with the technical treatment of drinking water, the method is simple, low cost, and the results are good, with significant economic and social benefits.
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