ĐÁNH GIÁ KHẢ NĂNG XỬ LÝ NGUỒN NƯỚC GIÀU CHẤT HỮU CƠ DỄ HÒA TAN CỦA MỘT SỐ CHỦNG VI SINH VẬT - VI TẢO KẾT HỢP VẬT LIỆU NANO FE-MN/AC

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Tác giả: Diễm Hồng Đặng, Thị Hoài Thu Ngô, Thị Kim Cúc Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Tài nguyên và Môi trường, 2022

Mô tả vật lý: tr.64-75

Bộ sưu tập: Metadata

ID: 333178

Thêm vào giỏ Liên kết toàn văn

Công nghệ sử dụng màng sinh học (Biofilm) do các vi sinh vật - vi tảo tạo ra kết hợp các vật liệu có kích thước nano với tính chất ưu việt đã và đang được xem là công nghệ tối ưu, xử lý có hiệu quả nguồn nước giàu (ô nhiễm) hữu cơ. Nghiên cứu đã phân lập và nhân nuôi ba chủng vi tảo (Chlorella sp., Scenedesmus sp. và Spirulina sp.) và ba chủng vi sinh vật (Bacillus sp., Aeromonas sp. và Pseudomonas sp.) có khả năng tạo màng sinh học (Biofilm) và xử lý nguồn nước giàu chất hữu cơ dễ hòa tan để phối kết hợp với chất mang là vật liệu nano Fe-Mn/AC than hoạt tính để thực hiện mô hình thí nghiệm xử lý nguồn nước thu gom từ hệ thống thủy lợi Bắc Hưng Hải. Hỗn hợp vi tảo - vi sinh vật được làm giàu trong 5 ngày và nuôi trong môi trường có chứa chất mang trong 3 ngày trước khí bắt đầu tham gia vào mô hình xử lý. Sau 6 ngày thí nghiệm, công thức CT4 gồm hỗn hợp nước giàu chất hữu cơ dễ hòa tan, vi tảo - vi sinh vật và chất mang cho hiệu quả xử lý cao nhất, BOD5 giảm còn 5,47 mg/L (42 %), nitơ tổng số còn 7,01 mg/L (giảm 75 %) và phốt pho tổng số còn 0,25 mg/L (giảm 63 %) đạt tiêu chuẩn theo cột B1 (chất lượng nước tưới) theo Quy chuẩn chất lượng quốc gia về chất lượng nước mặt QCVN 08-MT:2015/BTNMT. Bên cạnh hiệu quả xử lý cao, có thể so sánh với các kết quả của những công bố trước đó và trong thời gian tối ưu (06 ngày) ưu việt nữa của mô hình này là không gây mùi trong suốt quá trình xử lý.The technology of using microorganisms - microalgae biofilm in combination with nano-sized materials has been considered as an optimal technology for effective treatment of organically rich (polluted) water. This study isolated and cultured three strains of microalgae (Chlorella sp., Scenedesmus sp. and Spirulina sp.) and three strains of microorganisms (Bacillus sp., Aeromonas sp. and Pseudomonas sp.) which are capable in forming biofilms and treatment of high dissolved organic water. They were combined with the carrier as Fe - Mn/AC activated carbon nanomaterials to perform an experimental treatment model of water collected from the Bac Hung Hai irrigation system. The microalgae - microorganism mixture was enriched for 5 days and cultured in a medium containing the Fe - Mn/AC activated carbon nanomaterials for 3 days before using in the treatment model. After 6 days of experiment, formula CT4 with a mixture of wastewater, microalgae - microorganisms and Fe - Mn/AC activated carbon nanomaterials gave the highest treatment efficiency: BOD5 decreased to 5.47 mg/L (42 %), total nitrogen and total phosphorus were 7.01 mg/L (75 % reduction) and 0.25 mg/L (63 % reduction), respectively. Treated water meets the national standards for water quality used for irrigation (QCVN 08-MT:2015/BTNMT - column B1). In addition to the high treatment efficiency, compared with the results of previous publications and in the optimal time (06 days), another advantage of this model is that there is no odor during the treatment process.

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