Phản ứng so sánh của các bể tiêu hủy bùn ở nhiệt độ cao và nhiệt độ trung bình đối với nanoparticle oxit kẽm

Springer Science and Business Media LLC - Tập 28 - Trang 24521-24534 - 2020
Wesley Olaya1, Hina Dilawar1, Cigdem Eskicioglu1,2
1UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, Kelowna, Canada
2EME 4273, School of Engineering, Faculty of Applied Science, The University of British Columbia, Okanagan Campus, Kelowna, Canada

Tóm tắt

Việc xả thải không thể tránh khỏi của các nanoparticle oxit kẽm (ZnO NPs) từ các sản phẩm tiêu dùng và công nghiệp vào các nhà máy xử lý nước thải (WWTPs) đã tạo ra nhu cầu xác định ảnh hưởng của chúng đến quá trình tiêu hủy bùn. Trong nghiên cứu này, ảnh hưởng của kích thước hạt (30 nm và 100 nm), loại (được phủ và không được phủ) và liều lượng (6, 75 và 150 mg/g tổng chất rắn thức ăn (TS)) của ZnO NPs đối với quá trình tiêu hủy bùn yếm khí đã được nghiên cứu dưới điều kiện nhiệt độ trung bình (35 °C) và nhiệt độ cao (55 °C). Ảnh hưởng đã được điều tra qua hai giai đoạn với chế độ cấp liệu khác nhau cho bể tiêu hủy: (1) thử nghiệm tiềm năng metan sinh học theo kiểu lô (BMP), và (2) các bể phản ứng cấp liệu bán liên tục. Kết quả cho thấy rằng ZnO NPs có tác dụng ức chế ở mức trung bình và cao (75 và 100 mg ZnO/g TS, tương ứng). Các NP được phủ ít gây ức chế hơn so với các NP không được phủ. Vi khuẩn chịu nhiệt nhạy cảm hơn với ZnO NPs so với vi khuẩn nhiệt độ trung bình. Đối với ZnO NPs không được phủ, chỉ có các thử nghiệm batch ở nhiệt độ trung bình là có thể hồi phục ở nồng độ trung bình và các bể phản ứng nhiệt độ cao gặp phải tình trạng ức chế mãn tính và không thể hồi phục. Một kết quả tích cực là các ZnO NPs được phủ đã làm giảm đáng kể các hợp chất lưu huỳnh bay hơi gây mùi trong không gian đầu bể tiêu hủy so với các NP không được phủ. Tóm lại, điều kiện mà trong đó ZnO NPs sẽ có ảnh hưởng nhỏ hoặc không có ảnh hưởng là 6 mg/g TS với ZnO NPs được phủ dưới điều kiện nhiệt độ trung bình.

Từ khóa

#ZnO NPs #tiêu hủy bùn #bể yếm khí #hợp chất lưu huỳnh bay hơi #nhiệt độ trung bình #nhiệt độ cao

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