Abstract
The natural organic polymer coagulants have attracted much attention due to their safety, non-toxicity, good biodegradability and abundant sources of raw materials. However, the instability of coagulants has restricted their further development and application. In this paper, the main types of coagulants, the research of unstable performances and improvement measures are reviewed. Meanwhile, the applications in water treatment are introduced. Finally, the development prospects of coagulants are prospected in order to provide new ideas for the further study of natural organic polymer coagulants.
Highlights
The coagulation sedimentation method is one of the most common operation units in water treatment process, which adds coagulant to water to make colloidal and suspended particles aggregate into larger particles and separate them from water to achieve the purpose of water purification
Chitosan coagulant is a linear polymer with molecular weight over 105 obtained by deacetylation of chitin, which widely exists in insects and crustaceans
Because of its remarkable versatility and biocompatibility, it has become a new type of green coagulant material, which can effectively remove organic substances and heavy metals in water, so it is widely used in water treatment
Summary
The coagulation sedimentation method is one of the most common operation units in water treatment process, which adds coagulant to water to make colloidal and suspended particles aggregate into larger particles and separate them from water to achieve the purpose of water purification. This method has attracted much attention because of its simple operation, economic and effective characteristics[1,2]. The future development directions of coagulants are prospected in order to provide a new reference for the further study of natural organic polymer coagulants
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