Hiệu quả sử dụng chế phẩm vi sinh trong xử lý nước thải của ao nuôi tôm thẻ chân trắng thâm canh trên cát

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Tác giả: Hồng Duyệt Lê, Hữu Tình Lê, Thị Ngọc Trâm Võ, Văn Nha Võ

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học kỹ thuật Thú y, 2020

Mô tả vật lý: tr.58

Bộ sưu tập: Metadata

ID: 330659

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Experiments on the use of microbiological products for wastewater treatment in the intensive white leg shrimp culture ponds on sand floor were conducted with 4 different treatments (T) . Pond C1, pond C2: using microbiological products with dosages: 5ppm (T1), 10ppm (T2), frequency 5 days/time, 4 times in 20 days. Pond D2 (T3), pond D3 (T4): using probiotics with the doses of 5ppm, 10ppm, frequency 7 days/time, 3 times in 21 days. Microbiological products used in the treatments containing bacteria strains, such as: Bacillussp. with density in products was about 109 CFU per gram, Nitrosomonas sp., Nitrobacter sp. and fungi Saccharomyces sp. with density in products was about 108 CFU per gram for each type. Analysis of environmental parameters of wastewater before treatment in the experiments showed that: pH = 8.2-8.3, NH4+=10.65-12.64 mg/l and total N = 21.51-23.18 mg/l were under the allowable limits of QCVN 02–19:2014/ BNNPTNT and QCVN 40:2011/BTNMT
total TSS =185-196 mg/l, COD =276.53-294.35 mg/l, BOD5=112.4-124.38 mg/l, total P=8.41-23.18 mg/l and total Coliform =6130-6700 MPN/100 ml, exceeded permissible limits of QCVNs. After 21 days of using microbiological inoculants to treat wastewater, the environmental parameters that exceeded the permitted threshold were reduced, meeting the allowable limits of QCVN. The result of comparing economic efficiency when using microbiological products at different doses between experimental treatments showed that using a dosage of 5ppm products, at the frequency of 7 days/time, in 3 times was able to treat wastewater in the intensive white leg shrimp culture ponds on sand floor. It is suggested that the establishments can apply this study result in intensive shrimp culture ponds on sand floorThực nghiệm về việc sử dụng chế phẩm vi sinh trong xử lý nước thải nuôi tôm thẻ chân trắngtrên cát được tiến hành với 4 nghiệm thức (NT) khác nhau. Ao C1, ao C2: sử dụng chế phẩm visinh với liều lượng 5ppm (NT1)/10ppm (NT2), tần suất 5 ngày/lần, 4 lần trong 20 ngày. Ao D2,ao D3: sử dụng chế phẩm vi sinh liều lượng 5ppm (NT3)/10ppm (NT4), tần suất 7 ngày/lần, 3lần trong 21 ngày. Chế phẩm vi sinh sử dụng trong các nghiệm thức có chứa các dòng vi khuẩngồm: Bacillus sp. (mật số 109 CFU/g), Nitrosomonas sp., Nitrobacter sp. và nấm Saccharomycessp. (mật số 108 CFU/g mỗi loại). Phân tích các thông số môi trường nước thải trước xử lý ở cácnghiệm thức cho thấy: pH=8,2-8,3, NH4+=10,65-12,64 (mg/l) và tổng N=21,51-23,18 mg/l nằmdưới giới hạn cho phép của QCVN 02–19:2014/BNNPTNT và QCVN 40:2011/BTNMT
TSS=185-196 mg/l, COD=276,53-294,35 mg/l, BOD5=112,4-124,38 mg/l, tổng P=8,41-23,18 mg/lvà tổng Coliform=6130-6700 MPN/100 ml, vượt giới hạn cho phép của các QCVN. Sau 21 ngàysử dụng chế phẩm vi sinh để xử lý nước thải, các thông số môi trường vượt ngưỡng cho phép đềugiảm và nằm dưới giới hạn cho phép của các QCVN. Kết hợp với việc so sánh hiệu quả kinh tế khidùng chế phẩm vi sinh ở các liều lượng khác nhau giữa các nghiệm thức thí nghiệm cho thấy việcdùng liều lượng 5ppm chế phẩm vi sinh, tần suất 7 ngày/lần, trong 3 lần là có thể xử lý được nướcthải từ ao nuôi thâm canh tôm thẻ chân trắng trên cát. Các cơ sở nuôi thâm canh tôm thẻ chân trắngtrên cát có thể ứng dụng kết quả này trong xử lý nước thải ao nuôi.

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