Isolation, characterization and the potential use of starch from jackfruit seed wastes as a coagulant aid for treatment of turbid water

Sook Yan Choy, Krishna Murthy Nagendra Prasad, Ta Yeong Wu, Mavinakere Eshwaraiah Raghunandan, Bao Yang, Siew Moi Phang, Ramakrishnan Nagasundara Ramanan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (SciVal)

Abstract

Fruit wastes constituting up to half of total fruit weight represent a large pool of untapped resources for isolation of starch with diverse applications. In this work, the possibility of isolating starch from tropical fruit wastes and its extended application as a natural coagulant was elucidated. Amongst the 12 various parts of fruit wastes selected, only jackfruit seeds contained more than 50% of total starch content. Using alkaline extraction procedures, starch has been successfully isolated from local jackfruit seeds with a yield of approximately 18%. Bell-shaped starch granules were observed under SEM with a granule size ranging from 1.1 to 41.6 μm. Detailed starch characteristics were performed to provide a comparison between the isolated seed starch and also conventional starches. Among them, chemical properties such as the content of starch, amylose, amylopectin and the corresponding molecular weights are some of the key characteristics which governed their performance as natural coagulants. The potential use of isolated seed starch as an aid was then demonstrated in both suspensions of kaolin (model synthetic system) and Chlorella sp. microalga (real-time application) with plausible outcomes. At optimized starch dosage of 60 mg/L, the overall turbidity removal in kaolin was enhanced by at least 25% at a fixed alum dosage of 2.1 mg/L. Positive turbidity and COD removals were also observed in the treatment of Chlorella suspensions. Starches which served as bridging agents aided in the linkage of neighbouring microflocs and subsequently, forming macroflocs through a secondary coagulation mechanism: adsorption and bridging.

Original languageEnglish
Pages (from-to)2876-2889
Number of pages14
JournalEnvironmental Science and Pollution Research
Volume24
Issue number3
Early online date12 Nov 2016
DOIs
Publication statusPublished - Jan 2017

Keywords

  • Amylopectin
  • Bridging mechanism
  • Coagulant aid
  • Jackfruit seeds
  • Microalgae harvesting
  • Starch properties

ASJC Scopus subject areas

  • Environmental Chemistry
  • Pollution
  • Health, Toxicology and Mutagenesis

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