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Small-Scale Natural Wastewater Treatment Systems: Principles and Regulatory Framework1 Kiara Winans, Shanin Speas-Frost, Mike Jerauld, Mark Clark, and Gurpal Toor2

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Small-Scale Natural Wastewater Treatment Systems: Principles and Regulatory Framework1 Kiara Winans, Shanin Speas-Frost, Mike Jerauld, Mark Clark, and Gurpal Toor2 Archival copy: for current recommendations see http://edis.ifas.ufl.edu or your local extension office. SL365 Small-Scale Natural Wastewater Treatment Systems: Principles and Regulatory Framework1 Kiara Winans, Shanin Speas-Frost, Mike Jerauld, Mark Clark, and Gurpal Toor2 Introduction and Purpose Removing contaminants from wastewater before the effluent is released or reused will ensure that no harm is Natural systems used for treating wastewater are known caused to the environment. Untreated wastewater in the by many names, including constructed wetlands, artificial environment can cause eutrophication (algae growth in wetlands, biofilters, and various trademarked names. In water bodies), depressed oxygen levels (which will kill this article, these systems will be referred to as small-scale fish), accumulation of toxic chemicals and heavy metals in natural wastewater treatment systems (abbreviated as aquatic organisms, and human health concerns. “natural systems”). Natural systems both transform and hold on to many of the common pollutants that occur in Some conventional treatment systems with advanced household wastewater. These pollutants include disease- technologies actually use many of the principles of natural causing pathogens, suspended sediments, organic matter, systems. Examples of conventional treatment systems nutrients such as nitrogen (N) and phosphorus (P), heavy include septic tanks, aeration tanks, porous filter media, metals, and trace organic chemicals (Kadlec and Knight chemical polymers, distribution pumps, rock beds, earthen 1996). mounds, dispersion fields, and plastic chambers. However, when natural systems are incorporated into a landscape or The major natural processes occurring in natural systems building design, they can provide added benefits compared include sedimentation (settling of solids), plant uptake, to a conventional treatment system. bacterial degradation, and chemical adsorption (fixation). These processes help remove physical, biological, and Wetlands have been used numerous times to treat wastewa- chemical contaminants from wastewater. This is important ter, and they have proven to be a well-suited, cost-effective, because various contaminants found in untreated wastewa- and environmentally friendly treatment alternative to ter must be removed before the effluent can be safely reused conventional systems (DeBusk 1999). Constructed wetlands or released to the environment. Here wastewater refers to for small flows (from individual or community households wastewater prior to the removal of contaminants produced or businesses) have been a wastewater treatment option by domestic, municipal, industrial, or agricultural activities, for at least 18 years. The principles described in this article while effluent refers to wastewater following primary, apply to either vegetated submerged bed wetlands or secondary, tertiary, or advanced treatment. wetlands with an open water surface, even though there are 1. This document is SL365, one of a series of the Soil and Water Science Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date May 2012. Visit the EDIS website at http://edis.ifas.ufl.edu. 2. Kiara Winans, Ph.D. candidate, Department of Soil and Water Science; Shanin Speas-Frost, water reuse/wastewater wetlands coordinator, Florida Department of Environmental Protection, Tallahassee, FL; Mike Jerauld, research scientist 3, DB Environmental, Inc., Rockledge, FL; Mark Clark, associate professor, Department of Soil and Water Science; and Gurpal Toor, assistant professor, Department of Soil and Water Science, Gulf Coast Research and Education Center, Wimauma, FL; Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611. The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A&M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Millie Ferrer-Chancy, Interim Dean Archival copy: for current recommendations see http://edis.ifas.ufl.edu or your local extension office. differences between the two. Wallace and Knight (2004) of chemical inputs and result in sludge as a byproduct of the found that vegetated submerged bed wetlands are more treatment process. The natural systems may be especially commonly used for small-scale applications than wetlands effective and practically feasible in rural areas where homes with an open water surface because of the decrease in can be clustered together (for example, one system can exposure to pathogens. (Note: Vegetated submerged bed serve a number of structures with more than one and up to wetlands are also known as submerged flow, horizontal hundreds of connections). subsurface flow wetlands, and root zone systems. These wetlands are designed to create subsurface flow through Using natural processes to treat wastewater provides added a permeable medium, usually a gravel bed that is then benefits. These systems can be designed to be aesthetically planted with wetland vegetation.) appealing and can be incorporated into the landscape or a greenhouse. Similar to a fertilizer, the high nutrient content This document briefly describes the principles and added of the wastewater supports a dense plant growth. It is best benefits of natural systems. It then focuses on the use of to use native plants that will either persist throughout natural systems for treating small municipal wastewater the winter or regrow or reseed in the spring. However, it flows from commercial and residential sites (i.e., septic is possible to use multipurpose plant species, including systems or decentralized wastewater systems). This docu- ornamentals; these can provide a pleasing aesthetic and ment is not intended as a “how to” of treatment system bring a wildlife benefit (e.g., bird habitats) that conventional design. Instead it is an introduction to the use of natural systems rarely provide. processes (common in wetland ecosystems) for the purpose of treating wastewater. The target audience for this publica- Deciding which type of system to use (traditional or one tion includes community developers and city, county, or that employs a constructed wetland component) is based state personnel who may have the authority to approve use on environmental and regulatory requirements as well as of natural systems in select areas. physical constraints of the site. Natural vs. Conventional Principles of Small-Scale Natural Treatment Systems Wastewater Treatment Systems Individual residential and small commercial wastewater System Design of Small-Scale Natural flows are usually treated using an onsite wastewater treat- Wastewater Treatment Systems ment system (i.e., septic system). Septic systems typically Small-scale natural systems are designed on ecological provide adequate treatment for pathogens, and, if designed principles. The goal is to maximize the function of relevant properly, they will provide adequate treatment for both ecological processes within a limited area. The hydraulic nutrients and pathogens. In fact, several advanced onsite residence time (i.e., the amount of time the wastewater treatment systems incorporate the principles of natural remains in the system) is a key design factor. It is affected systems (i.e., aerobic and anaerobic pretreatment). For an by (1) the size of the components in the system, (2) the overview of wastewater flow and quality in septic systems, concentration of contaminants entering the system and the consult Toor et al. (2011) EDIS article “Onsite Sewage level of treatment required, and (3) the flow of wastewater Treatment and Disposal Systems: An Overview” available at through the system. There are typically two and sometimes http://edis.ifas.ufl.edu/ss549. three stages of treatment: pretreatment, biological polish- Compared to conventional onsite wastewater treatment ing, and, in some cases, effluent disinfection. Water quality systems, natural systems are generally more ecologically testing should be incorporated before and after each stage and economically efficient but are relatively more design- to ensure optimal performance and compliance. intensive. In these systems, pretreating the wastewater by The pretreatment stage involves breaking down of organic aerobic and/or anaerobic digestion allows microorganisms matter and settling of solids. Water quality testing done to biologically process the contaminants in the wastewater during the pretreatment stage measures the 5-day Biologi- so that wetland plants and algae in the water column can cal Oxygen Demand (BOD ) and total suspended solids take up and further process the contaminants. In contrast, 5 (TSS). (The 5-day Biological Oxygen Demand test is fairly conventional wastewater treatment methods used to further easy to conduct and measures the rate of oxygen uptake by reduce contaminants such as nutrients become increasingly microorganisms in water over a period of five days.) expensive to implement. These often require a large amount 2 Archival copy: for current recommendations
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