Nghiên cứu hệ thống A2O-MBR để loại bỏ đồng thời thành phần nitơ và phốt pho có trong nước thải sản xuất bia=An A2O-MBR system for simultaneous nitrogen and phosphorus removal from brewery wastewater

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Tác giả: Viết Hùng Đặng, Thị Thanh Hoa Nguyễn, Nữ Thái Thiên Văn

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Phát triển Khoa học & Công nghệ: Khoa học Trái đất và Môi trường, 2019

Mô tả vật lý: tr.12

Bộ sưu tập: Metadata

ID: 582168

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Anaerobic/Anoxic/Oxic – Membrane BioReactor (A2O-MBR) system was used to enhance simultaneous removal of nitrogen and phosphorus from brewery wastewater. The A2O unit containing microorganisms with short solids retention time (SRT) was employed mainly for removal of organic matter and phosphorus together with denitrification. The MBR containing microorganisms with long SRT was employed mainly for nitrification of NH4+-N and recirculation of NO3--N. The modelof A2O-MBR system made from polyacrylic with the capacity of 49.5 liters was operated with hydraulic retention times decreased from 24, 18 to 12 hours corresponding to organic loading rates increased from 0.50, 0.75 to 1.00 kg COD/m3.day. The results showed that the model not only treated organic matter well but also nearly completely removed both nitrogen and phosphorus.For all three loading rates, chemical oxygen demand (COD) concentration decreased significantly in the anaerobic and anoxic compartments of the A2O unit, indicating that most of organic matter was utilized in the anaerobic and anoxic compartments for phosphorus release and denitrification,respectively. Nitrification in the MBR was almost perfectly completed, with average NH4+-N removal efficiencies of over 98%. Denitrification in the anoxic compartment happened as much as possible. Demands for the development of PAOs, which were responsible for enhanced biological phosphorus removal (EBPR) processes, could be provided. For loading rate of 0.75 kg COD/m3.day, treatment efficiencies of COD, NH4+-N, total nitrogen (TN) and total phosphorus (TP) of the modelwere the highest as 95.4, 99.2, 86.7 and 84.6%, respectively. Output values of these parameters were within the limits of Vietnam National Technical Regulation on Industrial Wastewater (QCVN 40:2011/BTNMT), column A. The model of A2O-MBR system was capable of achieving effluents withvery low nitrogen and phosphorus concentrations from brewery wastewaterHệ thống xử lý nước thải sử dụng phương pháp sinh học kị khí, thiếu khí, hiếu khí đồng thời và kết hợp màng siêu lọc (A2O-MBR) đã được sử dụng nhằm tăng cường khả năng xử lý cùng lúc thành phần nitơ và phốt pho có trong nước thải sản xuất bia. Cụm A2O chứa vi sinh vật với thời gian lưu bùn ngắn chịu trách nhiệm loại bỏ hữu cơ, phốt pho và khử nitrat. Bể MBR chứa vi sinh vật với thời gian lưu bùn dài chịu trách nhiệm nitrat hóa amoni và tuần hoàn nitrat. Mô hình A2O-MBR được làm bằng mica với thể tích chứa 49,5 lít đã được vận hành với thời gian lưu nước giảm dần từ 24, 18 đến 12 giờ tương ứng với tải trọng hữu cơ tăng dần từ 0,50
0,75 đến 1,00kgCOD/m3.ngày. Kết quảcho thấy mô hình không chỉ xử lý tốt thành phần hữu cơ mà còn loại bỏ gần như hoàn toàn nitơ và phốt pho. Ở cả 03 tải trọng, nồng độ COD đã giảm đáng kể ở các ngăn kị khí và thiếu khí của cụm A2O, cho thấy phần lớn cơ chất đã được sử dụng ở các ngăn kị khí và thiếu khí, tương ứng với các quá trình tách phốt pho và khử nitrat. Nitrat hóa trong bể MBR đã xảy ra gần như hoàn toàn, với hiệu quả loại bỏ amoni là trên 98%. Khử nitrat trong ngăn thiếu khí được thực hiện nhiều nhất có thể. Các điều kiện cần thiết cho sự phát triển của vi sinh vật tích lũy phốt pho (PAOs) để loại bỏ phốt pho bởi tăng cường sinh học (EBPR) có thể đã được cung cấp. Ở tải trọng 0,75kgCOD/m3.ngày, hiệuquả xử lý COD, NH4+-N, TN và TP của mô hình là cao nhất, tương ứng với 95,4
99,2
86,7 và 84,6%.Giá trị đầu ra của các thông số này là nằm trong giới hạn cho phép của QCVN 40:2011/BTNMT, cột A. Mô hình A2O-MBR có khả năng đạt được đầu ra của nước thải sản xuất bia với nồng độ nitơ và phốt pho rất thấp

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