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MEKARN Conference 2010
 Live stock production, climate change and resource depletion

Evaluation of method for treating pig waste water by applying a model of fish pond or biodigester followed a fish pond in Phuoc Tho State farm

Luu Huu Manh, Nguyen Nhut XuanDung, Bui thi Le Minh, Mai Thuy Duong

Cantho University, Vietnam
lhmanh@ctu.edu.vn

 

Abstract

A study was conducted to determine two methods of treating the wastewater from pig farm by draining directly to a fish pond or biodigester followed a fish pond and to evaluate the effect of the pig number per unit of water surface on the water quality. Quality of water was evaluated by using parameters of temperature, pH, dissolved oxygen (DO), chemical oxygen demand (COD), biochemical oxygen demand (BOD5), suspended solids (SS), total nitrogen, total phosphorus, total Coliforms and parasitic eggs.  The results show that the model of biodigester followed the fish pond was more effectively and the quality of the wastewater in the fish pond met the government standards and reached type A (Vietnam Standard: TCVN 5945 – 2005). For the first model, the pig number of 2.25/100m2 water surface was more effectively than that of 5.33/100m2. For the second model, the pig number of 4.5/m3 biodigester and 5.4 pig/100m2 water surface are more effectively than that of 19.7 and 9.12, respectively. The wastewater pig can be solved by using bio-treating methods, the model of biodigester followed the fish pond is more effectively.

Key words: biodigester, fish pond,  pig manure, Vietnam standard, wastewater treatment

 

 

 

 

Experimental design:

1. A model of fish pond

  

 

 

 


 

Table 1. Number of pigs/ water surface

 

Pig heads

Pig head/100m2 water surface

Treat 1

32

5.33

Treat 2

33

2.35

 

 

2. A biodigester followed a fish pond

 

  

 

 

 


 

Table 2. Number of pigs/biodigester and fish pond

 

Pig head

Biodigester (m3)

Fish pond (m2)

Pig head/m3 biodigester

Pig head/100m2 water surface

Treat 3

985

50

10800

19.7

9.12

Treat 4

227

50

4200

4.54

5.4

 

Results

Table 1. Effect of treating waste water of the model of fish pond

Pig head/100 m2 water surface

From pig pen

Fish pond

P

Temperature, oC

5.33

28.33a

29.92b

<0.01

2.35

28.67a

29.75b

<0.01

pH

5.33

7.40a

6.72b

<0.01

2.35

7.37a

6.92b

<0.01

DO, mg/l

5.33

0.00a

1.43b

<0.01

2.35

0.00a

3.135b

<0.01

BOD5, mg/l

5.33

957.60a

72.53b

<0.01

2.35

877.33a

72.67b

<0.01

COD, mg/l

5.33

1650a

98.67b

<0.01

2.35

28.67a

72.67b

<0.01

SS, mg/l

5.33

1350a

116.67b

<0.01

2.35

1350a

88.33b

<0.01

Nitrogen, mg/l

5.33

54.36a

8.46b

<0.01

2.35

50.45a

7.84b

<0.01

Phosphorus, mg/l

5.33

329.99a

41.86b

<0.01

2.35

295.54a

25.38b

<0.01

Parasites, egg/l

5.33

9.00a

0.00b

<0.01

2.35

12.00a

0.00b

<0.01

Coliforms, MPN/100ml

5.33

 

1.1x106

 

2.35

 

4.6x105

 

 

Table 1. Effect of treating waste water of the model of biodigester followed fish pond

Pig head/

/ m3 biodigester

Pig head/100 m2 water surface

From pig pen

Biodigester

Fish pond

P

Temperature, oC

19.7

9.12

29.67a

31.00b

28.42b

<0.01

4.5

5.4

29.33a

31.33b

28.50b

<0.01

pH

19.7

9.12

7.47a

6.43b

7.08b

<0.01

4.5

5.4

7.23a

6.60b

7.05b

<0.01

DO, mg/l

19.7

9.12

0.00a

0.00a

3.43b

<0.01

4.5

5.4

0.00a

0.00a

3.48b

<0.01

BOD5, mg/l

19.7

9.12

1172a

327.20b

28.67b

<0.01

4.5

5.4

1156a

96.00b

24b

<0.01

COD, mg/l

19.7

9.12

2120a

486.67b

47.20b

<0.01

4.5

5.4

2043a

186.70b

42.30b

<0.01

SS, mg/l

19.7

9.12

1833a

473.33b

48.33b

<0.01

4.5

5.4

1750a

180.00b

43.00b

<0.01

Total nitrogen, mg/l

19.7

9.12

63.48a

23.72b

6.69b

<0.01

4.5

5.4

56.25a

11.29b

4.632b

<0.01

Total Phosporus, mg/l

19.7

9.12

386.90a

109.11b

10.01b

<0.01

4.5

5.4

439.10a

91.34b

5.96b

<0.01

Parasites, egg/l

19.7

9.12

9.00a

0.00b

0.00b

<0.01

4.5

5.4

11.00a

0.00b

0.00b

<0.01

Coliforms, MPN/100ml

19.7

9.12

 

 

4.6x104

 

4.5

5.4

 

 

2.4x104