The performance of enhanced coagulation for treating slightly polluted raw water combining polyaluminum chloride with variable charge soil

The feasibility and effectiveness of treating pollutants in slightly polluted raw water by variable charge soil and polyaluminum chloride (PAC) was investigated. Removal efficiencies of turbidity, phenol, aniline, algae and heavy metals (Cu(2+), Zn(2+) and Pb(2+)) were used to evaluate the coagulati...

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Bibliographic Details
Published in:Water science and technology 2014-01, Vol.70 (12), p.1907-1912
Main Authors: ZHANG, Z. L, WU, C. D, WANG, Y. J, TANG, J. C, LIU, Y. P
Format: Article
Language:English
Subjects:
Adsorption
Algae
Aluminum Hydroxide - chemistry
Analysis methods
Aniline
Aniline Compounds - isolation & purification
Applied sciences
Coagulants
Coagulation
Copper
Environmental Pollution
Exact sciences and technology
Feasibility Studies
Flocculation
Heavy metals
Lead
Metals, Heavy - isolation & purification
Natural water pollution
Neutralization
Phenol - isolation & purification
Phenols
Pollutants
Pollution
Raw water
Soil
Soil investigations
Soil pollution
Soil water
Soils
Turbidity
Water
Water Pollutants, Chemical - isolation & purification
Water pollution
Water Purification - methods
Water treatment and pollution
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Summary:The feasibility and effectiveness of treating pollutants in slightly polluted raw water by variable charge soil and polyaluminum chloride (PAC) was investigated. Removal efficiencies of turbidity, phenol, aniline, algae and heavy metals (Cu(2+), Zn(2+) and Pb(2+)) were used to evaluate the coagulation performance. The results indicated that the addition of variable charge soil as a coagulant aid is advantageous due to the improvement of removal efficiencies. The tests also demonstrated that the presence of variable charge soil increased the removal of turbidity rather than adding residuary turbidity. The use of variable charge soil produced settleable flocs of greater density and bigger size. The main mechanism involved in the PAC coagulation was supposed to be sweep flocculation as well as charge-neutralization. Variable charge soil played a promoted aid role by adsorption in the enhanced coagulation process. It is concluded that the enhanced coagulation by PAC and variable charge soil, as coagulant and adsorbent, is more effective and efficient than traditional coagulation.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2014.423