Journal of Polymers and the Environment

, Volume 20, Issue 3, pp 858–864 | Cite as

Coagulation of Sericin Protein in Silk Degumming Wastewater Using Quaternized Chitosan

  • Junxiong Lin
  • Lan Wang
  • Lei Wang
Original Paper


The evaluation of 2-hydroxypropyltrimethyl ammonium chloride chitosan (HACC), a biodegradable cationic polymer, for the coagulation of sericin in silk degumming waste solution was carried out using jar-test coagulation experiments. The coagulation efficiency was assessed by the factors of residual turbidity, sericin removal and CODCr. The results indicated that the efficiency were dependent on the operational parameters of pH, coagulant dosage and settling time. The optimal pH value was found to be around 8, while a 1 g/L HACC dosage was sufficient in providing more than 98 % turbidity removal and 76 % sericin removal. The results were comparable to those got by the use of conventional coagulants. The coagulation of sericin by HACC may be involved in a dual mechanism including charge neutralization and bridging mechanism. Moreover, the sludge cake from the coagulation, mainly containing sericin protein and modified chitosan, might be used as finishing agent for polyester fabric or food additive for animals after fundamental purified.


Chitosan Sericin Coagulation Flocculation 



The authors express their gratitude to the Zhejiang Provincial Key Innovation Team (No. 2010R50038) for financial support of this research.


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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Engineering Research Center for Dyeing and Finishing of TextilesZhejiang Sci-Tech University, Ministry of Education of ChinaHangzhouChina
  2. 2.Key Laboratory of Advanced Textile Materials and Manufacturing TechnologyZhejiang Sci-Tech University, Ministry of Education of ChinaHangzhouChina

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