Khảo sát ảnh hưởng của nồng độ muối đến hiệu suất xử lý cod của mô hình uasb đối với nước thải sản xuất nước tương trong điều kiện thí nghiệm

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Tác giả: Thị Điệp Huỳnh, Quỳnh Loan Lê, Kế Sương Ngô, Đắc Khải Nguyễn, Hoàng Dũng Nguyễn, Anh Vũ Phạm, Quang Vinh Trần, Thị Mỹ Ngọc Trần, Trung Kiên Trần, Thị Tuyết Nhung Vũ

Ngôn ngữ: vie

Ký hiệu phân loại: 639.32 Fish culture in salt waters

Thông tin xuất bản: Tạp chí khoa học công nghệ và thực phẩm - Đại học Công nghiệp Thực phẩm TP Hồ Chí Minh, 2021

Mô tả vật lý: 57-65

Bộ sưu tập: Metadata

ID: 498558

Thêm vào giỏ

Nước thải chứa một lượng lớn các chất hữu cơ chưa qua xử lý mà xả thải trực tiếp vào các nguồn nước tiếp nhận sẽ gây tác động xấu đến môi trường. Nước thải vừa chứa nhiều các hợp chất hữu cơ vừa có độ muối cao càng làm tăng thêm mức độ gây hại đến môi trường cũng như gây khó khăn cho công tác xử lý nước thải. Nghiên cứu này ứng dụng mô hình UASB (Upflow Anaerobic Sludge Blanket) để xử lý COD (Chemical Oxygen Demand) của nước thải có độ mặn cao - nước thải từ hoạt động sản xuất nước tương. Bùn hoạt tính kỵ khí được lấy từ bể kỵ khí của hệ thống xử lý nước thải Công ty TNHH nước chấm MeKong (huyện Đức Hòa, tỉnh Long An). Thể tích bùn đưa vào cột UASB ở thời điểm ban đầu chiếm 40% thể tích cột. Mô hình được lắp dựng tại phòng thí nghiệm và vận hành với nước thải giả định (lưu lượng 10 L/ngày) ở 3 giai đoạn tương ứng với nồng độ muối NaCl khác nhau lần lượt là 0,59%, 0,89%, 1,18%. Trong suốt quá trình thí nghiệm tiến hành phân tích các thông số như pH, COD, N-NH4, P-PO4 và theo dõi lượng biogas tạo thành trong thời gian 180 ngày. Kết quả thu được, ở nồng độ muối 0,89% NaCl hiệu suất khử COD của mô hình đạt giá trị cao nhất 77,2% với tổng thể tích biogas thu được trung bình là 8,5 L/ngày, mật độ vi sinh vật tương ứng ở giai đoạn này đạt 1,5 × 108 CFU/mL.That untreated wastewater containing a large number of organic compounds is discharged directly into the running water would lead to several negative effects on the environment. Besides the environmental problems, wastewater containing both high organic compounds and high salinity concentration would cause more difficulties to set up the treatment procedure. In this study, we applied the UASB (Upflow Anaerobic Sludge Blanket) model in the COD (Chemical Oxygen Demand) treatment of high salinity wastewater such as soy sauce production wastewater. Anaerobic activated sludge was taken from the anaerobic tank of the wastewater treatment system of Mekong company (Duc Hoa district, Long An province). After that, the sludge was mixed and put into the UASB column, input volume was 40% of the total column volume. The microbial community in the sludge is the source of bio-remediation factors of the UASB column. Finally, the model was performed in the laboratory and investigated the COD treatment effect on different salinity concentration synthetic wastewater (NaCl concentrations are 0.59%, 0.89%, 1.18%, respectively), the capacity of the model is 10 liters per day. During 180 days of the experiment, the chemical indicators such as pH, COD, N-NH4, P-PO4 were analyzed, and the amount of biogas produced in the model was tracked. As a result, the maximum COD treatment efficiency of the model was 77.2% at the wastewater sample containing 0.89% NaCl, the average biogas capacity gained 8.5 liters per day, and the microbial density at this stage reached 1.5 × 108 CFU/mL. The UASB column could be able to withstand a high rate and changed loading flow, the result of this study provides the evidence that UASB model could be applied to organic wastewater treatment processing in a high salt concentration.

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