NGHIÊN CỨU XỬ LÝ Cr, Ni TRONG NƯỚC THẢI XI MẠ BẰNG VẬT LIỆU HẤP PHỤ TỪ VỎ TRẤU

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Thông tin xuất bản: Tạp chí Khoa học Công nghệ và Thực phẩm (Tên mới: Tạp chí Khoa học Đại học Công Thương), 2020

Mô tả vật lý: tr.75

Bộ sưu tập: Báo, Tạp chí

ID: 329610

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Đề tài nghiên cứu xử lý Cr, Ni trong nước thải xi mạ với vật liệu hấp phụ được chế tạo từ vỏ trấu hoạt hoá bằng H2SO4 ở quy mô phòng thí nghiệm. Kết quả nghiên cứu cho thấy hiệu quả hấp phụ đạt cao nhất đối với Cr là 82,8% và 90,7% đối với Ni ở các điều kiện vận hành nồng độ Cr, Ni đầu vào lần lượt là 35,73 mg/L và 54,27 mg/L, pH 6, thời gian hấp phụ tối ưu 60 phút và liều lượng chất hấp phụ là 3 g/50 mL. Mối quan hệ giữa lượng chất bị hấp phụ trên chất hấp phụ với nồng độ Cr, Ni trong nước thải ở trạng thái cân bằng được biểu diễn phù hợp qua phương trình đẳng nhiệt Langmuir với dung lượng hấp phụ đạt cực đại đối với Cr là 0,598 mg/g và Ni là 0,835 mg/g. Tuy nồng độ Cr, Ni sau xử lý vẫn còn cao so với QCVN 40:2011/BTNMT nhưng hiệu quả loại bỏ nồng độ Ni, Cr ban đầu đạt hơn 80% cho thấy phương pháp hấp phụ bằng các vật liệu hấp phụ có nguồn gốc từ các phụ phẩm trong nông nghiệp có thể xử lý một lượng đáng kể nồng độ Ni, Cr ban đầu.Study on removing Cr, Ni in plating wastewater by adsorption method with adsorbent materials made from rice husks that activated by H2SO4 at laboratory scale. The results showed that adsorption efficiency reached the highest 82.8% of Cr and 90.7% of Ni under operating conditions: Cr, Ni concentrations were 35.73 mg/L and 54.27 mg/L respectively, pH 6, adsorption time was optimal 60 minutes and adsorbent dose was 3 g/50 mL. The relationship between amount of adsorbed on the adsorbent with the concentration of Cr, Ni in equilibrium was properly expressed through the Langmuir isothermal equation with the maximum adsorption capacity for Cr was 0.598 mg/g and Ni was 0.835 mg/g. Although the concentration of Cr, Ni after treatment has not reached the level of QCVN 40: 2011/BTNMT, but the removal efficiency of the initial concentration of Ni, Cr more than 80% has shown that it can handle a significant amount of Ni, Cr is initially treated by adsorption method.

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