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    題名: Coagulation of chitin production wastewater from shrimp scraps with by-product chitosan and chemical coagulants
    作者: Tran, Nguyen Van Nhi;Yu, Qiming Jimmy;Nguyen, Tan Phong;Wang, San‐Lang
    關鍵詞: high strength wastewater treatment;turbidity removal;chitin and chitosan;chemical coagulation;crude protein recovery
    日期: 2020-03-06
    上傳時間: 2020-03-09 12:10:19 (UTC+8)
    出版者: MDPI
    摘要: 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.
    關聯: Polymers 12(3), 607
    DOI: 10.3390/polym12030607
    顯示於類別:[化學學系暨研究所] 期刊論文

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