Development of coagulants for intensification of sewage water clarification of paper and paperboard production
DOI:
https://doi.org/10.15587/1729-4061.2013.9253Keywords:
aluminum coagulant of high basicity, water clarification, aluminum hydroxochloride, turbidity, sedimentation, filtration.Abstract
The intensification of the clarification processes of sewage waters of paper production at local clearing plants is the urgent problem. The high performance of these plants provides the significant reduction of fresh water for the production of paper and paperboard, and leads to the significant reduction of amounts of sewage waters per tonne of paper and paperboard. Therefore there is a need to find highly efficient reagents for the intensification of clarification of sewage waters with high turbidity. In the first place, these reagents should include aluminum hydroxochloride.In the article we suggest a way to get 1/3 of aluminum hydroxochloride, based on the interaction of technical aluminum hydroxide with hydrochloric acid. To increase the basicity of the coagulants we suggested two alternative methods. The first method consists in heating of the obtained 1/3 of aluminum hydroxochloride in a vacuum. As a result, due to partial hydrolysis of 1/3 of aluminum hydroxochloride at 100 0С, the last turned into 2/3 of aluminum hydroxochloride, and at 140 0С in 5/6 of aluminum hydroxochloride. The alternative way to increase the basicity of 1/3 of aluminum hydroxochloride is the processing of obtained coagulant with basic reagents such as: CaO, MgO, CaCO3.
To confirm the perspectives of application of the obtained coagulants the researches were conducted to determine their effectiveness in the clarification of sewage waters of high turbidity of paper and paperboard production.
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