Ảnh hưởng của pH, khối lượng, thời gian và nồng độ nitrate lên khả năng hấp phụ nitrate của than tre trong nước thải biogas
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Abstract
The main purpose of this research is an evaluation of the nitratee removal efficiency from biogas solution by using bamboo biochar. The characteristics of the bamboo biochar were determined by Brunauer-Emmett-Teller (BET) test, and Scanning electron microscopy (SEM). The experiment was conducted in the lab and designed completely randomized with five replications. The results demonstrated that the optimum conditions for the effective adsorption of nitratee ion onto bamboo biochar were found to be pH 4, biochar dosage of 1 g L-1, and retention time of 15 min. The experimental data were fitted to different adsorption isotherms models (Langmuir, Freundlich models). The maximum adsorption capacity of bamboo biochar for nitratee removal was found to be 8.1 mg g−1.
Tóm tắt
Mục tiêu của nghiên cứu là đánh giá khả năng hấp phụ nitrate trong nước thải biogas bằng than sinh học tre. Đặc điểm của than tre được xác định bằng cách đo diện tích bề mặt riêng (BET) và chụp ảnh SEM. Thí nghiệm được tiến hành trong phòng thí nghiệm và được bố trí hoàn toàn ngẫu nhiên với 5 lần lặp lại. Kết quả nghiên cứu cho thấy quá trình hấp phụ nitrate đạt tối ưu khi pH dung dịch bằng 4, với khối lượng than là 1 g, thời gian hấp phụ đạt cân bằng sau 15 phút. Dữ liệu thí nghiệm phù hợp với các mô hình hấp phụ đẳng nhiệt khác nhau (mô hình Langmuir, mô hình Freundlich). Dung lượng nitrate hấp phụ cực đại của than tre đạt 8,1 mg/g.
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