Coagulation of Chitin Production Wastewater from Shrimp Scraps with By-Product Chitosan and Chemical Coagulants

Polymers
Nguyen Van Nhi TranSan-Lang Wang

Abstract

Chitin production wastewater contains nutrient-rich organic and mineral contents. Coagulation of the wastewater with a natural coagulant such as by-product chitosan would be an economical and environmentally friendly method of treatment. This study investigated the treatment efficiencies of a preliminary sedimentation process followed by coagulation. The removal efficiencies for wastewater parameters were evaluated and compared for coagulants including by-product chitosan, polyaluminum chloride, and polyacryamide. The evaluation was based on the removal of wastewater turbidity and other criteria, including tCOD, sCOD, TKN, NH4+-N, TP, TSS, calcium, and crude protein. The results showed that the preliminary sedimentation (before coagulation) can remove over 80% of turbidity and more than 93% of TSS at pH 4 in 30 min. At optimal conditions, when the ratio of crude protein and calcium was 4.95, by-product chitosan dose of 77.5 mg·L-1 and pH = 8.3, the wastewater characteristics changes were tCOD 23%, sCOD 32%, TKN and ammonium 25%, TP 90%, TSS 84%, Ca2+ 29%, and crude protein 25%. The residue recovered through coagulation consists of up to 55 mg·g-1 crude protein, which is used for animal feed or crop fertilizer.

References

Apr 26, 2005·Journal of Colloid and Interface Science·Niramol SakkayawongWoranan Nakbanpote
Mar 27, 2007·Bioresource Technology·Xiaolin ChenPengcheng Li
Oct 15, 2013·Applied Biochemistry and Biotechnology·Tzu-Wen LiangSan-Lang Wang
Dec 3, 2014·Journal of Environmental Sciences (China)·Sook Yan ChoyRamakrishnan Nagasundara Ramanan
Jan 21, 2017·Journal of Environmental Management·Mehdi AhmadiNematollah Jaafarzadeh Haghighifard
Mar 9, 2018·Marine Drugs·Chien Thang DoanSan-Lang Wang
May 12, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Van Bon NguyenSan-Lang Wang
Feb 17, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chien Thang DoanSan-Lang Wang
Mar 25, 2019·International Journal of Biological Macromolecules·Chien Thang DoanSan-Lang Wang
Jun 19, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chi-Hao WangSan-Lang Wang
Sep 11, 2019·Environmental Science and Pollution Research International·Weiping SuWeihong Wu
Dec 28, 2019·Marine Drugs·Van Bon NguyenSan-Lang Wang

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