BƯỚC ĐẦU ỨNG DỤNG PHƯƠNG PHÁP ĐÔNG TỤ SINH HỌC LÀM TĂNG HIỆU SUẤT LẮNG TRONG XỬ LÍ NƯỚC THẢI CHẾ BIẾN THỦY SẢN

TẠP CHÍ ĐẠI HỌC SÀI GÒN Số 5 - Tháng 01/2011 144 BƯỚC ĐẦU ỨNG DỤNG PHƯƠNG PHÁP ĐƠNG TỤ SINH HỌC LÀM TĂNG HIỆU SUẤT LẮNG TRONG XỬ LÍ NƯỚC THẢI CHẾ BIẾN THỦY SẢN DƯƠNG THỊ GIÁNG HƯƠNG (*) BÙI MẠNH HÀ (**) HUỲNH NGỌC LOAN (***) LÂM MINH TRIẾT (****)  bài báo           ABSTRACT This article focuses on the experimental research on Bio-Flocculation-Absorption Sedimentation process which helps increase sedimentation in mechanical treatment (secondary treatment), and creat suitable conditions for biological treatment. The object of study is the wastewater from the processingof fresh water products. The following factors have some effects on this process: aeration time with air output 0.5m3/hour/m3(20 minutes), MLSS (4g/l), and sedimentation time (one hour and a haft) are favorable conditions. As a result, the removal of suspended solids at the settlement tank obtains 84.64%, suitable for the biological treatment process that follows. Key Words: Bio-Flocculation; Fishy wastewater; Sedimentation process;  1.  (*),(**) (***) (****)    (*),(**) ThS, Tr (***)   (****) n HCM      các   gây nên mùi hơi tanh cao (250 -1000 mg/l)  - 60)% phía 145                phèn                        phía sau. V                tâm. M                                                                           -test,  làm thoáng                        2.         -  -   -                     bảng 1. Bảng 1:  pH - Độ màu [Pt Co] SS [mg/l] COD [mgO 2 /l] N tổng [mg/l] P tổng [mg/l] BOD 5 [mgO/l] Cu [mgll] Pb [mg/l] Zn [mg/l] Ni [mg/l] Hg [mg/l] 6.19 - 6.48 692- 872 580- 628 2890 -3225 280 - 424 40.0 - 50.3 1800 - 2080 0.204 < 0.05 0.322 <0.025 <0.005 rong           TP. HCM.         hình là: pH, COD, BOD 5 , MLSS, TSS, và  146 Hình 1:  1. 12 3.  3.1. Mô hình đông tụ sinh học            -3800 (mg/l). Bùn            8 g/l).          5 , SS so sánh   Bảng 2.  vào  MLSS COD BOD 5 MLSS g/l 0 3110 2440 620 2 928 750 180 3 875 650 172 4 725 550 130 5 715 545 120 6 705 525 110 7 698 514 105 8 680 498 93 (mg/l) Hình 2.   MLSS [g /l] 60.0 65.0 70.0 75.0 80.0 85.0 90.0 2.0 4.0 6.0 8.0 Hiệu suất xử lí (%) COD BOD5 TSStb  2             5      là                 147  . Bảng 3.    Thời gian làm thoáng TSS tb Độ đục Phút (mg/l) NTU 0 620 574 5 130 395 10 116 369 20 95 356 30 90 348 40 85 325 50 82 327 Hình 3.         0.0 20.0 40.0 60.0 80.0 100.0 5 10 20 30 40 50 Hiệu quả xử lí (%) TSS tb Độ đục tb phút     20 phút.                         Al 2 (SO 4 ) 3   3.2. Mô hình kết hợp đông tụ sinh học và hiếu khí từng mẻ                  bảng 4. Bảng 4.  hình sinh   Error! Not a valid link. Hình 4.       BOD 5 tr   0.0 20.0 40.0 60.0 80.0 100.0 0 2 4 6 8 10 12 14 Thời gian (giờ) Hiệu quả xử lí (%) COD BOD5  8 giờ g  5       -2005). 3.3. Các mô hình kiểm chứng     ,                  nên  không cao.   148                                          5  3.4. So sánh hiệu quả từ 4 mô hình Hình 5.  0 20 40 60 80 100 Tự nhiên (nền) Làm thoáng Đông tụ sinh học Đông tụ hóa chất 51.43 64.6 84.64 86.29 Hiệu suất lắng của bốn quá trình TSS                có thêm      . Hình 6.  COD BOD5 68.28 91.71 64.19 66.82 93.77 58.09 0 20 40 60 80 100 Hiệu suất xử lý sinh học của ba quá trình (%)                                     149 -         ,    -         ên  -      -                                                     -       30 phút). -      tác nhân                               -   Dùng phèn nhôm là tác nhân   -          kh                                TÀI LIỆU THAM KHẢO 1. h gia TP.HCM, (2004). 2.  htt, (2002). 3.  hg(2004). 4. Ei-Gohary, et al., Physicochemical - biological treatment of municipal waste water, Water Sci. Technol. 24 (7), 285-292 (1991). 5. Gambrillm, et al., Physiochemical treatment of tropical wastewater: production of microbiologically safe effluents for unrestricted crop irrigation Water Sci.Technol. 26 (7/8), 1449-1458 (1992). 150 6. W. Zhao, et al., Advanced primary treatment of waste water using a bio- flocculation- adsorption sedimentation process, Acta. Biotech., 20, 53-64 (2000). . - 6.48 692- 872 580- 628 2890 -3225 280 - 424 40.0 - 50.3 1800 - 208 0 0 .204 < 0 .05 0.322 <0.025 <0. 005 rong     .  MLSS COD BOD 5 MLSS g/l 0 3110 2440 620 2 928 750 180 3 875 650 172 4 725 550 130 5 715 545 120 6 705 525 110 7 698 514 105 8 680 498 93 (mg/l) Hình 2.  . (mg/l) NTU 0 620 574 5 130 395 10 116 369 20 95 356 30 90 348 40 85 325 50 82 327 Hình 3.         0.0 20. 0 40.0 60.0 80.0 100.0 5