Related Experiment Video
Updated: Aug 12, 2025
08:24
Mesocosm-Scale Constructed Wetland Design for Wastewater Treatment
Published on: May 2, 2025
245
Assessing relationships between onsite wastewater treatment system maintenance patterns and system-level variables
Kyle N Connelly1, Seth J Wenger1, Nandita Gaur2
1Odum School of Ecology, University of Georgia, Athens, GA 30602, USA; The River Basin Center, University of Georgia, Athens, GA 30602, USA.
The Science of the Total Environment
|January 29, 2023
Summary
Millions of households use onsite wastewater treatment systems (OWTSs). Older and new OWTSs show higher failure rates, indicating a need for targeted maintenance and early inspections to ensure system longevity and prevent pollution.
Area of Science:
- Environmental Engineering
- Water Resource Management
- Public Health
Background:
- Millions of households worldwide depend on onsite wastewater treatment systems (OWTSs) for safe wastewater disposal.
- Conventional subsurface OWTSs are cost-effective but can cause nonpoint pollution if malfunctioning.
- Understanding OWTS maintenance and failure is crucial for watershed protection.
Purpose of the Study:
- To investigate the relationship between OWTS age, environmental factors, and system maintenance/failure.
- To identify key drivers influencing the longevity and performance of septic systems.
- To inform strategies for prioritizing OWTS repair and replacement.
Main Methods:
- Analysis of OWTS repair and pumping records in Athens-Clarke County, Georgia.
- Correlation of system age and environmental characteristics with failure indicators.
- Statistical examination of OWTS performance across different age groups.
Main Results:
- 7.8% of 8826 OWTSs were repaired over 78 years; median age of repaired systems was 65 years.
- 12.2% of OWTSs required pumping within 38 months (5.7% annualized rate).
- Systems over 50 years old and new systems (2-10 years) showed the highest probability of hydraulic failure.
Conclusions:
- OWTS repair and replacement efforts should prioritize aging systems nearing end-of-life.
- Early-stage hydraulic failures in new OWTSs necessitate prompt inspection one year post-installation.
- This reproducible approach can guide local authorities in prioritizing wastewater infrastructure investments and policies.
Related Concept Videos
01:25Design Example: Designing a Residential Plumbing System
773
The design of residential plumbing systems requires carefully evaluating water demand, flow rates, and pressure dynamics to ensure both efficiency and reliability. The nature of water flow within pipes is defined by its Reynolds number, which classifies flow as either laminar (smooth) or turbulent.
773
01:30Typical Model Studies
411
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
411
04:01Factors Affecting Solubility
33.7K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.7K
01:24Factors Affecting Workability
100
The workability of concrete is a critical characteristic that influences the ease of mixing, handling, and finishing the concrete. It is affected by several factors including water content, aggregate properties, and admixtures like air entrainment. Water plays a fundamental role as it lubricates the concrete mix, facilitating easier movement and placement. However, the water requirement varies depending on the texture and shape of aggregates. Finer particles and angular, rough-textured...
100
01:30Environmental Applications of Microorganisms
109
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
109
01:21Design Example: Creating a Hydraulic Model of a Dam Spillway
263
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
263