Treatment of highly turbid water using chitosan and aluminum salts

Ching Yao Hu, Shang Lien Lo, Chia Ling Chang, Fu Ling Chen, Yu De Wu, Jia Lin Ma

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The high turbidity in surface water may make it difficult for water treatment plants to supply drinking water. Chitosan, a natural linear cationic polymer, and aluminum chloride, a metal salt, and the mixture of the two coagulants were used to treat highly turbid raw water in this study according to the residual turbidity, sludge volume and residual aluminum concentration. The residual turbidity was less than 50 NTU but the sludge/water volume ratio was over 150 mL/L after aluminum salt coagulation (135 mg/L as Al), which could stop the sedimentation process. The amount of sludge produced after chitosan coagulation (5 mg/L) was only about 1/5 of that for aluminum coagulation for the similar turbidity removal. Chitosan coagulation, however, still has two problems that need to be solved. First, the residual turbidity of treated water is still too high for sand filtration. Second, the colloid particles may restabilize if chitosan is overdosed. Adding a comparative low dosage of aluminum salt (13.5 mg/L as Al) with chitosan can successfully solve both of the problems. The sludge volume ratio only increased slightly and the residual turbidity was less than 10 NTU. Moreover, the restabilization of colloids did not occur. The residual aluminum concentration, which could lead to Alzheimer's disease, can also be reduced significantly after addition of chitosan.

Original languageEnglish
Pages (from-to)322-326
Number of pages5
JournalSeparation and Purification Technology
Volume104
DOIs
Publication statusPublished - 2013

Fingerprint

Chitosan
Turbidity
Aluminum
Salts
Coagulation
Water
Colloids
Aluminum chloride
Coagulants
Water treatment plants
Surface waters
Sedimentation
Potable water
Drinking Water
Particles (particulate matter)
Polymers
Sand
Metals

Keywords

  • Aluminum chloride
  • Chitosan
  • Residual aluminum concentration
  • Sludge
  • Turbidity

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

Cite this

Treatment of highly turbid water using chitosan and aluminum salts. / Hu, Ching Yao; Lo, Shang Lien; Chang, Chia Ling; Chen, Fu Ling; Wu, Yu De; Ma, Jia Lin.

In: Separation and Purification Technology, Vol. 104, 2013, p. 322-326.

Research output: Contribution to journalArticle

Hu, Ching Yao ; Lo, Shang Lien ; Chang, Chia Ling ; Chen, Fu Ling ; Wu, Yu De ; Ma, Jia Lin. / Treatment of highly turbid water using chitosan and aluminum salts. In: Separation and Purification Technology. 2013 ; Vol. 104. pp. 322-326.
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