Performance Expectations

The performance expectations for SSF constructed wetlands are considered in the following discussion. As with the free water system (FWS; see Chapter 6), process performance depends on design criteria, wastewater characteristics, and operations. Removal mechanisms are described in Chapter 3.

TABLE 7.3

Total BOD Removal Observed in Subsurface Flow Wetlands

TABLE 7.3

Total BOD Removal Observed in Subsurface Flow Wetlands

Location

Pretreatment

Influent

(%)

Nominal Detention Time (d)

Benton, Kentucky"

Oxidation pond

23

8

65

5

Mesquite, Nevadab

Oxidation pond

78

25

68

3.3

Santee, Californiac

Primary

118

1.7

88

6

Sydney, Australia11

Secondary

33

4.6

86

7

a Full-scale operation from March 1988 to November 1988, operated at 80 mm/d (Watson et al., 1989).

b Full-scale operation, January 1994 to January 1995. c Pilot-scale operation in 1984, operated at 50 mm/d (Gersberg et al., 1985). d Pilot-scale operation at Richmond, New South Wales, near Sydney, Australia, operated at 40 mm/d from December 1985 to February 1986 (Bavor et al., 1986).

a Full-scale operation from March 1988 to November 1988, operated at 80 mm/d (Watson et al., 1989).

b Full-scale operation, January 1994 to January 1995. c Pilot-scale operation in 1984, operated at 50 mm/d (Gersberg et al., 1985). d Pilot-scale operation at Richmond, New South Wales, near Sydney, Australia, operated at 40 mm/d from December 1985 to February 1986 (Bavor et al., 1986).

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