Hydraulic Loading Cycle

In SAT systems, the hydraulic loading cycle consists of an application (flooding) period followed by a drying (resting) period. This intermittent cycle is key to the successful performance of an SAT system. Application periods range from 1 to 9 d, while drying periods range from 5 to 20 d. Hydraulic loading cycles can be

TABLE 8.22

Hydraulic Loading Cycles for Soil Aquifer Treatment

TABLE 8.22

Hydraulic Loading Cycles for Soil Aquifer Treatment

Wastewater

Application

Drying/Resting

Loading Objective

Applied

Season

Period (d)

Period (d)

Maximize infiltration rates

Primary

Summer

1-2

6-7

Winter

1-2

7-12

Secondary

Summer

2-3

5-7

Winter

1-3

6-10

Maximize nitrification

Primary

Summer

1-2

6-9

Winter

1-2

7-13

Secondary

Summer

2-3

5-6

Winter

1-3

6-10

Maximize nitrogen removal

Primary

Summer

1-2

10-13

Winter

1-2

13-20

Secondary

Summer

6-7

9-12

Winter

9-12

12-16

Source: Adapted from Crites, R.W. and Tchobanoglous, G., Small and Decentralized Wastewater Management Systems, McGraw-Hill, New York, 1998.

Source: Adapted from Crites, R.W. and Tchobanoglous, G., Small and Decentralized Wastewater Management Systems, McGraw-Hill, New York, 1998.

selected to maximize infiltration rates, maximize nitrification, or maximize nitrogen removal. Hydraulic loading cycles for these three objectives are presented in Table 8.22. For mild climates, the shorter drying periods and longer application periods are used. For cold or wet climates, the longer drying periods are necessary.

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