Land Area Comparison

The land area required for a community wastewater flow of 1 mgd (3785 m3/d) is estimated using the above equations for each of the processes and is summarized in Table 2.4. The three geographical locations in Table 2.4 reflect climate variations and the need for different amounts of storage: 5-month storage for SR and

TABLE 2.4

Planning Level Land Area Estimates for 1-mgd (3785-m3/d) Systems

North

Mid-Atlantic South

Treatment System

[ac (ha)]

[ac (ha)]

[ac (ha)]

Pond systems:

Oxidation

NA

NA

30 (12.1)

Facultative

157 (63.6)

102 (41.3)

48 (19.3)

Controlled discharge

152 (61.7)

152 (61.7)

152 (61.7)

Partial-mix

48 (19.3)

36 (14.5)

27 (11.0)

Free water surface constructed wetlands

56 (22.7)

47 (19.1)

40 (16.3)

Subsurface flow constructed wetlands

24 (9.7)

20 (8.2)

17 (7.0)

Slow rate

311 (126)

240 (97)

168 (68)

Overland flow

215 (87)

160 (65)

111 (45)

Soil aquifer treatment

14 (5.7)

14 (5.7)

14 (5.7)

OF in the north, 3-month storage in the mid-Atlantic, and no storage in the warm climate (south). No storage is expected for constructed wetlands, but the temperature of the wastewater is reflected in the larger land area requirements in the colder north. Allowances are included in the area requirements for unusable land and preliminary treatment.

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