Nghiên cứu ảnh hưởng của tỷ lệ vi tảo Chlorella sp. và bùn hoạt tính loại bỏ chất dinh dưỡng và chất hữu cơ cho nước thải có nồng độ C/N thấp

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Tác giả: Xuân Thành Bùi, Văn Tiến Đỗ, Linh Thy Lê, Thị Ái Duyên Lý, Phương Thảo Nguyễn, Thị Bé Liên Nguyễn, Thị Thùy Dương Nguyễn, Công Sắc Trần

Ngôn ngữ: vie

Ký hiệu phân loại: 571.29 Microorganisms, fungi, algae

Thông tin xuất bản: Khoa học & công nghệ Việt Nam, 2022

Mô tả vật lý: 58 - 64

Bộ sưu tập: Metadata

ID: 499468

Thêm vào giỏ

Hỗn hợp vi tảo và bùn hoạt tính được nuôi cấy trong hệ thống photobioreactor (PBR) với các tỷ lệ nuôi cấy khác nhau (1:0, 3:1, 1:1, 0:1 wt/wt) nhằm xác định một tỷ lệ tốt nhất cho việc loại bỏ chất hữu cơ, chất dinh dưỡng trong hệ thống đồng nuôi cấy. Kết quả nghiên cứu cho thấy, hệ đồng nuôi cấy có tỷ lệ vi tảo cao hơn sẽ loại bỏ tổng nitơ (TN) tốt hơn. Hệ thống PBR với tỷ lệ nuôi cấy 1:0, 3:1 có tốc độ loại bỏ TN cao hơn so với các tỷ lệ 1:1 và 0:1, đạt tốc độ loại bỏ cao nhất ở tỷ lệ 1:0 với hiệu quả xử lý lên đến 96% và tỷ lệ 3:1 đạt 90% sau 6 ngày vận hành. Ngoài ra, bể phản ứng chỉ có vi tảo, bể phản ứng đồng nuôi cấy vi tảo và bùn hoạt tính có hiệu quả xử lý tổng photpho (TP) cao hơn so với hệ thống chỉ có bùn hoạt tính. Hiệu quả xử lý TP cao nhất ở môi trường nuôi cấy tảo đơn lẻ (tỷ lệ 1:0) đạt 98,8% TP chỉ sau 9 ngày. Tỷ lệ 3:1 và 1:1 cho thấy tốc độ loại bỏ nhu cầu ôxy hóa học (COD) cao hơn đáng kể so với các tỷ lệ khác, lần lượt là 131 mg/l/ngày và 118 mg/l/ngày. Sau 4 ngày vận hành, tỷ lệ 3:1 xử lý tới 96% COD với tốc độ loại bỏ riêng cao nhất (132,7 mg/l/ngày). Đánh giá dựa trên hiệu quả xử lý chất dinh dưỡng và chất hữu cơ cho thấy, tỷ lệ 3:1 của hệ đồng nuôi cấy vi tảo và bùn hoạt tính trong hệ thống PBR là tốt nhất trong ứng dụng xử lý nước thải.Microalgae and activated sludge were co-cultured in photobioreactor (PBR) systems with different ratios (1:0, 3:1, 1:1, 0:1 wt/wt) to determine an optimal ratio for organic matter and nutrient removal. The results showed that the PBR systems at 1:0 and 3:1 ratios have higher total nitrogen (TN) removal rates than at two others. The highest TN removal at the ratio of 1:0 achieved 96% and at the ratio 3:1 achieved 90% after six days of operation. In addition, the single-microalgae culture and co-culture microalgae-activated sludge systems had higher TP removal than that in the single-activated sludge one. The highest TP removal of 98.8% was achieved at 1:0 ratio after nine days. The 3:1 and 1:1 ratios had significantly higher COD removal rates than the other ratios with 131 mg/l/d and 118 mg/l/d, respectively. After four days of operation, the 3:1 ratio reached the highest specific removal rate of 132.7 mg/ l/d. This study showed that the 3:1 ratio of microalgae co-culture and activated sludge is an optimal ratio for wastewater treatment-based microalgae application.

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