Đánh giá hiệu quả xử lý độ đục của chất trợ keo tụ có nguồn gốc tanin chiết xuất từ một số phụ phẩm nông nghiệp=Turbidity Removal Efficiency of Tannin Based Flocculants Derived from Different Agricultural Waste

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Tác giả: Minh Loan Lưu

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Trái đất và Môi trường, 2024

Mô tả vật lý: tr.83-90

Bộ sưu tập: Metadata

ID: 474346

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Chất trợ keo tụ sinh học có nguồn gốc tanin đã được nghiên cứu, sản xuất và thương mại hoá như một sản phẩm triển vọng trong xử lý nước cấp và nước thải. Nghiên cứu này có mục đích so sánh hiệu quả xử lý độ đục của các chất trợ keo tụ nguồn gốc tanin từ một số phụ phẩm nông nghiệp. Tanin được tách chiết theo phương pháp siêu âm (dung môi cồn 50%, 2 giờ, ở 500 kHz) và biến tính theo phản ứng Mannich sử dụng HCHO và NH4Cl. Quá trình kiểm tra hiệu quả keo tụ và trợ keo sử dụng thí nghiệm Jar-test trên mẫu nước nhân tạo với độ đục ban đầu là 200 NTU. Kết quả cho thấy, tại pH 7 và lượng chất keo tụ phèn nhôm là 5 ppm, hiệu quả xử lý độ đục của các chất trợ keo tụ sản xuất từ vỏ nhãn, vỏ cây mai dương, bã chè và vỏ chuối xanh lần lượt là 93%, 92,7%, 92%, và 89,8%
tương ứng với liều chất trợ keo tụ sử dụng là 10, 12 ppm, 8 ppm và 8 ppm. Hiệu suất tạo thành sản phẩm đối với bã chè (9,4%), vỏ cây mai dương (7,1%) và vỏ nhãn (4,6%) cao hơn hẳn so với vỏ chuối xanh (0,5%). Dựa trên hiệu quả loại bỏ độ đục, liều tối ưu và hiệu suất tạo thành sản phẩm, bã chè được kết luận là nguồn nguyên liệu có tiềm năng nhất trong 4 nguyên liệu nghiên cứu để sản xuất chất trợ keo tụ có nguồn gốc tanin.Tannin-based flocculants have been investigated, produced, and commercialized as a promising product in water supply and wastewater treatment. This study compared turbidity removal efficiency of tannin-based flocculants produced from different agricultural waste. Tannin was extracted using ultrasonic method (ethanol 50%, 2 h, 500 kHz) and modified according to Mannich reaction using HCHO and NH4Cl. The coagulation and flocculation efficiencies were determined using Jar-tests on artificial wastewater with initial turbidity of 200 NTU. The results showed that at pH 7 and alum dosage of 5 ppm, turbidity removal efficiency of flocculants derived from longan pericarp, mimosa bark, green tea waste, and green banana peel were 93%, 92.7%, 92%, and 89.8%, respectively
corresponding to flocculant dosages of 10 ppm, 12 ppm, 8 ppm and 8 ppm. Production efficiency for green tea waste (9.4%), mimosa bark (7.1%), longan pericarp (4.6%) were much higher than that for green banana peel (0.5%). Based on the turbidity removal and production efficiencies as well as the optimal dosages of tannin-based flocculants, green tea waste was found to be the most potential material of all four agricultural waste to produce tannin-based flocculants.

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