Analysis and optimization of coagulation and flocculation process

被引:143
作者
Saritha V. [1 ]
Srinivas N. [1 ]
Srikanth Vuppala N.V. [1 ]
机构
[1] Department of Environmental Studies, GITAM Institute of Science, GITAM University, Visakhapatnam
关键词
Chitin; Coagulation and Flocculation; Mixing speed; Sago;
D O I
10.1007/s13201-014-0262-y
中图分类号
学科分类号
摘要
Natural coagulants have been the focus of research of many investigators through the last decade owing to the problems caused by the chemical coagulants. Optimization of process parameters is vital for the effectiveness of coagulation process. In the present study optimization of parameters like pH, dose of coagulant and mixing speed were studied using natural coagulants sago and chitin in comparison with alum. Jar test apparatus was used to perform the coagulation. The results showed that the removal of turbidity was up to 99 % by both alum and chitin at lower doses of coagulant, i.e., 0.1–0.3 g/L, whereas sago has shown a reduction of 70–100 % at doses of 0.1 and 0.2 g/L. The optimum conditions observed for sago were 6 and 7 whereas chitin was stable at all pH ranges, lower coagulant doses, i.e., 0.1–0.3 g/L and mixing speed—rapid mixing at 100 rpm for 10 min and slow mixing 20 rpm for 20 min. Hence, it can be concluded that sago and chitin can be used for treating water even with large seasonal variation in turbidity. © 2015, The Author(s).
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页码:451 / 460
页数:9
相关论文
共 40 条
[1]  
Amuda O.S., Amoo I.A., Ajayi O.O., Performance optimization of coagulant/flocculant in the treatment of wastewater from a beverage industry, J Hazard Mater, 129, 1-3, pp. 69-72, (2006)
[2]  
Babu R., Chaudhuri M., Home water treatment by direct filtration with natural coagulant, J Water Health, 3, pp. 27-30, (2005)
[3]  
Bina B., Mehdinejad M.H., Nikaeen M., Movahedian Attar H., Effectiveness of chitosan as natural coagulant aid in treating turbid waters, Iran J Environ Health Sci Eng, 6, 4, pp. 247-252, (2009)
[4]  
Blackburn R.S., Natural polysaccharides and their interactions with dye molecules: applications in effluent treatment, Environ Sci Technol, 38, pp. 4905-4909, (2004)
[5]  
Buleon A., Colonna P., Planchot V., Ball S., Starch granules: structure and biosynthesis, Int J Biol Macromol, 23, pp. 85-112, (1998)
[6]  
Di Bernardo A.S., Di Bernardo L., Frollini E., Influence of the application time on the efficiency of polymer flocculation/sedimentation. XXVII Inter-American Congress of Sanitary and Environmental Engineering, Annals, (2009)
[7]  
Divakaran R., Pillai V.N., Flocculation of river silt using chitosan, Water Res, 36, pp. 2414-2418, (2002)
[8]  
Ebeling J.M., Sibrell P.L., Ogden S.R., Summerfelt S.T., Evaluation of chemical coagulation/flocculation aids for the removal of suspended solids and phosphorus from intensive recirculating aquaculture effluent discharge, Aquacult Eng, 29, pp. 23-42, (2003)
[9]  
Feisal K., Montarop Y., Chitin research revisited, Mar Drugs, 8, 7, pp. 1988-2012, (2010)
[10]  
Guibal E., Interactions of metal ions with chitosan-based sorbents: a review, Sep Purif Technol, 38, pp. 43-74, (2004)