For Batch Test in Pond 4 at Dickinson North Dakota

Temper- NH4-

Sampling Date

Days

ature

DO

PH

N

Ce/Co

ln Ce/Co

kCM

kPM

Co/Ce -

6/3/98 averages

0.00

15.92

0.83

7.74

19.52

1

0

0

6/4/98 averages

1.00

16.12

1.00

7.72

22.74

1.1652

0.1529

—0.1418

0.152877

-0.1418

6/10/98 averages

7.00

15.26

1.49

7.74

24.02

1.2309

0.2077

-0.0268

0.029673

-0.1876

6/15/98 averages

12.00

17.80

7.05

8.02

22.99

1.1778

0.1636

-0.0126

0.013634

-0.1509

6/16/98 averages

13.00

17.38

7.58

8.06

21.73

1.1134

0.1074

-0.0078

0.008264

-0.1019

6/22/98 averages

19.00

17.30

12.10

8.41

18.43

0.9440

-0.0576

0.0031

-0.00303

0.0593

6/29/98 averages

26.00

18.07

14.85

8.81

13.59

0.6965

-0.3618

0.0168

-0.01391

0.4358

7/2/98 averages

29.00

20.24

15.70

8.73

13.62

0.6979

-0.3597

0.0149

-0.0124

0.4329

7/9/98 averages

36.00

23.32

14.32

8.78

10.71

0.5489

-0.5999

0.0228

-0.01666

0.8219

7/15/98 averages

42.00

23.95

3.88

8.59

9.95

0.5096

-0.6740

0.0229

-0.01605

0.9621

7/21/98 averages

48.00

24.77

7.58

8.50

8.88

0.4550

-0.7874

0.0249

-0.0164

1.1976

7/23/98 averages

50.00

24.23

5.72

8.47

8.62

0.4414

-0.8177

0.0253

-0.01635

1.2653

7/30/98 averages

57.00

22.87

0.85

7.72

9.10

0.4663

-0.7629

0.0201

-0.01338

1.1444

8/4/98 averages

62.00

21.91

1.30

7.95

9.20

0.4716

-0.7517

0.0181

-0.01212

1.1206

8/12/98 averages 70.00 24.36 8.36 8.14 12.07

8/18/98 averages 76.00 22.54 2.82 7.93 10.46

Source: Courtesy of Pump Systems, Inc., Dickinson, ND.

0.6184 -0.4807 0.0088 -0.00687 0.6172

0.5360 -0.6237 0.0114 -0.00821 0.8657

0.4793 -0.7355 0.0129 -0.00876 1.0864

0.4035 -0.9076 0.0164 -0.01008 1.4783

Batch Process - NH4-N Removal: Dickinson, ND

9.00

Batch Process - NH4-N Removal: Dickinson, ND

100.00,8.40

Time, days

FIGURE 4.31 Plot of NH4-N data using plug-flow model.

100.00,8.40

7.40

Time, days

FIGURE 4.31 Plot of NH4-N data using plug-flow model.

A complete-mix section can be located anywhere in the flow train of an aerated lagoon system. Locating the complete-mix cell near the end of the flow train has the advantage of nitrifying after carbonaceous BOD has been removed in the lagoon system. When the complete-mix zone is first in the process, sludge can easily be returned to a manhole or other suitable location upstream of the plant influent. By recycling sludge to the headworks, anoxic conditions and a high food to microorganism ratio will help control sludge bulking, provide some denitrification, and recover alkalinity.

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