TREATMENT WETLANDS - CHAPTER 21 pot

... HSSF wetlands. The minimum-cost alterna- tive to Figure 23.11, Chapter 23, for small-scale wetlands is a xed standpipe with removable extensions, as implied in Figure 21. 18. For large-scale ... Francis Group, LLC 746 Treatment Wetlands better control of the ow distribution (Brix, 1998). A sche- matic of this is shown in Figure 21. 8. For small-scale wetlands, ow-splitting ap...

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... 615 Other Natural Systems 619 16.7 Pre- and Post -Treatment Requirements 621 Pretreatment 621 Wetland Survival Limits 621 Excessive Solids 621 Phosphorus Precipitates 621 Excessive Nitrogen 622 Strong ... LLC Introduction to Treatment Wetlands 5 1.2 TYPES OF TREATMENT WETLANDS Modern treatment wetlands are man-made systems that have been designed to emphasize specic charac...

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... HSSF wetlands. (Adapted from Wallace and Knight (2006) Small-scale constructed wetland treatment systems: Feasibility, design criteria, and O&M requirements. Final Report, Project 01-CTS-5, ... 2-ha aerated lagoons, and is then stored in a 12-ha pond for summer dis- posal to a 600-ha peatland locally known as the Porter Ranch Peatland. The Porter Ranch Peatland has received better-...

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... illus- trates this effect. Warm-UporCool-Down? The Tres Rios, Arizona, demonstration project operated 12 research wetlands (0.12 ha) and 4 pilot scale wetlands (about 1.0 ha). The research wetlands ... progression of temperatures at the Niagara-on-the-Lake, Ontario, VF wetland. The measurement point was at 60-cm depth in a 90-cm downward ow path. The wetland was ood-dosed six times...

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... 1995). REDUCTION OF AMMONIA IN FWS WETLANDS Reductions of ammonia in treatment wetlands systems can be represented by loading analysis and the P-k-C* model. The median net period-of-record removal rate for ... 10203040506070 HLR –1 (d/m) Organic-N (mg/L) FIGURE 9.22 Decline of organic nitrogen with detention time (inverse HLR) for side-by-side HSSF wetlands receiving dairy efuen...

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... 1.4 7- log. For different virus classications, this is broken down as coliphage (2.52-log), somatic coliphage (1.14-log), F coli- phage (0.41-log), MS-2 (1.78-log), and enterovirus (4.00-log). ... indicate that pulse-loaded unsat- urated ow VF wetlands can reduce viral organisms on the order of 2-1 og. This can be subdivided into somatic coliphage (2.70-log) and F coliphage (1.3...

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... wetland treatment systems. Plant propagules that are frequently used to establish constructed wetlands for wastewater treatment include seeds, bare-root seedlings, rhizomes, greenhouse- grown potted ... 4.7-ha follow-on wetlands. Table 7.8 indicates that it is easily pos- sible to settle river-borne solids in just a few days detention in a presettling basin with removals of over 90...

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... unaffected natu- ral wetlands. Information collected for NADB v.2 indicates TABLE 19.1 Progression of Two Side-by-Side Wetlands at the Olentangy River Wetlands Park over a Start-Up Period of ... species that actually occur in treatment wetlands. Wetland plant diversity is a poorly understood subject both in unaffected natural wetlands and in treatment wet- lands. Wetlands are...

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... incom- ing water and regional climate as well as the goals of wetland treatment, as discussed in Chapter 16. This chapter discusses different sizing methodologies for SSF wetlands. Chapter 21 ... TABLE 20.11 Examples of Ammonia-N and Nitrate-N Removal/Buildup in VF Constructed Wetlands Location NH 4 -N In (mg/L) NH 4 -N Out (mg/L) NO 3 -N In (mg/L) NO 3 -N Out (mg/L) Dhulikhel,...

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... pollutant removal for one-dimensional cases (Fogler, 1992). A two- dimensional version requires a two-dimensional velocity eld, which are virtually nonexistent for treatment wetlands. The tracer ... only infrequently applica- ble to treatment wetlands. The dimensionless parameter that characterizes Equa- tion B.43 is the Peclet number (Pe), or, its inverse, the wet- land dispersion...

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