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
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BÙI MẠNH HÀ
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HUỲNH NGỌC LOAN
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LÂM MINH TRIẾT
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
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. 
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




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ThS, Tr
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

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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).