Volume No. 4 Issue No.: 2 Page No.: 517-527 Oct.-Dec 2009

 

STUDY OF BLENDED COAGULANT ALUM AND Moringa oleifera FOR TURBIDITY REMOVAL

 

C.P. Pise*, M.R. Gidde1 and A.R. Bhalerao2

1. Department of Civil Engineering, Sinhgad College of Engineering, Pune - 411041, Maharashtra (INDIA)
2. Department of Civil Engineering, Bharati Vidyapeeth University College of Engineering, Pune - 411043, Maharashtra (INDIA)

 

Received on : August 28, 2009

 

ABSTRACT

 

A study was carried out in the settling columns with no coagulant and with traditional coagulant Alum, natural coagulant Moringa oleifera, and blended Coagulant Alum and Moringa oleifera. The jar-tests were conducted to determine the optimum dosage of coagulants such as traditional coagulant Alum, Natural coagulant Moringa oleifera, and blended Coagulant Alum and Moringa oleifera to maximize the removal of turbidity from the turbid water. The optimum coagulant dosage showed that the coagulation with blended coagulant Alum and Moringa oleifera was better than Alum. A study was carried out in a specially designed two settling column of diameter 18.5 cm and 30 cm to investigate the settling characteristics of different initial turbidity samples such as 150 NTU (Low), 450 NTU (Medium), 1000 NTU (High). For the alum coagulant with initial turbidity 150 NTU, 450 NTU, 1000 NTU the optimum dosage was found to be 50 mg/ l, 100 mg/ l, 200 mg/ l, respectively. The Optimum dosage for Moringa oleifera coagulant was found to be 125 mg/ l, 200 mg/ l, 350 mg/ l, respectively. Also for Blended coagulant Alum and Moringa oleifera the optimum dosage was found to be Alum-12.5 mg/ l and M.O- 75 mg/ l, Alum-37.5 mg/ l and M.O- 150 mg/ l, Alum- 75 mg/ l and M.O- 200 mg/ l, respectively. In this blending process we reduce the Alum dose up to 75 % for 150 NTU initial Turbidity samples and for 450 NTU, 1000 NTU the Alum dose is reduced up to 62.5 %. So we can reduce the drawbacks of the Alum Coagulant.

 

Keywords : Coagulation, Settling column, Alum, Blended coagulant Alum, Moringa oleifera

 

 

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