Evaluation of performance of different aluminium-based coagulants and aids in river water clarification

Coagulation and flocculation is one of the most effective, economic and convenient method for raw water clarification. In recent times, different hydrolysing coagulants, particularly aluminium-based ones are in wide use. In the present study, different aluminium-based salts, polymer and coagulant ai...

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Bibliographic Details
Published in:International journal of sustainable development and planning 2014-06, Vol.9 (3), p.417-429
Main Authors: Mukherjee, S., Bhattacharya, A.K., Mandal, S.N.
Format: Article
Language:English
Subjects:
Alum
Aluminum
Aluminum chloride
Aluminum sulfate
Bentonite
Coagulants
Coagulation
Criteria
Flocculation
Potash
Potassium carbonate
Powder
Raw water
Rivers
Salts
Side effects
Turbidity
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Summary:Coagulation and flocculation is one of the most effective, economic and convenient method for raw water clarification. In recent times, different hydrolysing coagulants, particularly aluminium-based ones are in wide use. In the present study, different aluminium-based salts, polymer and coagulant aid were used to observe their effectiveness as well as side effects, if any. Turbidity was the prime criterion for clarification of the raw water; however, the potentially hazardous residual aluminium was also given due importance. Poly-aluminium chloride (PACl) enhanced the performance of the potash alum when used in tandem, whereas bentonite powder used as coagulant aid proved ineffective in improving the performance of the potash alum with respect to the removal of the turbidity. PACl when used alone or in tandem with potash alum showed character significantly different from aluminium-based salts only, with respect to the criterion of residual aluminium.
ISSN:1743-7601
1743-761X
DOI:10.2495/SDP-V9-N3-417-429