Study On The Characteristics Of High Density Reticular Floccule In The Flocculant Reaction

Flocculate-precipitate is one of the most widely used and the lowest cost water treatment method. In order to improve the result of coagulation, we often adding the high polymer flocculant in water treatment while adding the coagulant. It forms heavy and closely floccule and gets good water quality.The mechanism of flocculating in water of high polymer flocculant is mainly about absorbing-bridging. Coagulant and high polymer flocculant jointly thrown can form a kind of high density reticular floccule with high density and gel network structure. This structure can't formed by adding coagulant alone. The characteristics of high density reticular floccule have special influence to the water quality in the course of water treatment which are different from ordinary floccule.This thesis has expounded the formation mechanism of the high density reticular floccule systematically and discussed the perhaps influence to water quality according to the characteristics of high density reticular floccule. The thesis have designed water treatment experiment of moving water according to the different characteristics of high density reticular floccule and ordinary floccule .The high polymer flocculant used in the experiment is PAM. In terms of analyzing the data from move water experiment, this thesis make a comparison between high density reticular floccule and ordinary floccule. The comparison is form three aspects: subsiding performance, absorbing performance and anti-cutting performance. For the difference between high density reticular floccule and ordinary floccule and the difference between different high density reticular floccule, the thesis summarizes some characteristics of high density reticular floccule.(1) High density reticular floccule is provided with stronger grain size of particle and better subsiding performance which can improve the mud compressing. Furthermore, it is provided with stronger ability of absorbing, it is effectual to deal with the organic matter.(2) High density reticular floccule is provided with bad anti-cutting performance. And the high density reticular floccule which made from aluminium salt coagulant is provided with the better anti-cutting performance compared iron salt. (3) High density reticular floccule can result in water quality when the original water is provided with thinner sands.