19. Hybrid Lagoon Performance Record (1): Wastewater Meat Processing　from 1981

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Preface
Table of Contents
Foundation
Hybrid Lagoon System
Case Study
Applications Proposals

19. Hybrid Lagoon Performance Record (1):
Wastewater Meat Processing　from 1981

In May of 1980, the first hybrid lagoon automatic control facilities were constructed in Tochigi City, Tochigi Prefecture, and are now in operation. The performance record of these facilities and rate of generation of excess sludge are as given below.

Photo 8. "HLS" during the construction.

Photo 9. The bird's-eye view of "HLS"

In the five years since the beginning of operation of these facilities in May 1981, the amount of drainage has increased each year; but even at year's end and in other seasons marked by vigorous plant activity, the rate of denitrification remained around 90%, and stable operation was maintained throughout the year. The concentration of activated sludge increased gradually, and at two years and two months after the beginning of operation, sludge processing (soil dispersion; white circles in tables) was begun. Recently, excess sludge purged of water has been mixed with assorted hog feed. Discharged water is used for agricultural purposes (black circles in tables). (materials provided by Tochigi Health Care Center on discharged water quality; [Photos 10 -12, text 218-226].

Photo 10. Structure in the center of "HLS"

[Q=m3/d.BOD.SS.N-H.ML=mg/l]

　
pH

BOD

SS

N-H

ML

Q
　
pH

BOD

SS

N-H

ML

Q

1981.Av

7.1

9.3

8.9

0.41

--

--

1985/1

6.9

3.0

5.8

0.4

7500

700

1982.Av

6.9

6.7

13.5

0.39

4300

--

1985/2

7.2

2.2

3.0

0.7

6900

700

1983.Av

6.8

6.7

8.9

0.3

6500
　
1985/3

7.1

6.4

5.8

0.1

7300

700

1984/1

7.2

2.8

5.8

0.1

6100
　
1985/4

6.9

4.1

8.0

1.6

7200

700

1984/2

7.2

2.6

6.6

0.0

6600
　
1985/5

6.9

1.6

5.4

1.0

8300

700

1984/3

7.0

4.8

4.8

8.8

6200
　
1985/6

6.9

4.5

9.8

1.0

8900

800

1984/4

6.9

4.6

4.6

3.6

6800

700

1985/7

6.9

9.2

8.0

1.0

9900

850

1984/5

7.0

6.6

6.6

19

7400

700

1985/8

7.1

1.5

4.8

>1

8100

850

1984/6

7.4

2.4

1.8

0.3

8500

800

1985/9

7.1

6.8

22

>1

6200

850

1984/7

7.0

9.5

9.5

28

8800

800

1985/10

7.1

5.8

4.0

>1

6000

950

1984/8

7.1

2.2

2.6

0.6

4600

800

1985/11

7.2

7.3

1.2

>1

5900

950

1984/9

6.9

5.5

8.8

0.0

4200

800

1985/12

7.0

7.4

6.0

>1

7200

1300

1984/10

7.0

3.6

15

0.0

4300

800

1985Av
　
4.74

10.9

>1

6300

838

1984/11

7.1

5.4

22

0.2

4800

850
　　　　　　　

1984/12

7.0

6.5

9.0

0.3

6500

1200
　　　　　　　

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