Kiera Jefferson
Conventional pollutants are a term used in the USA to refer to water pollutants that can be treated by a municipal sewage treatment plant. These pollutants fall into five categories, namely biochemical oxygen demand, total suspended solids, pH levels, the amount of fecal coliform, and the quantity of oil and grease. The Environmental Protection Agency (EPA) identifies and regulates these pollutants, setting standards and requirements for their discharge and treatment. The EPA also designates certain pollutants as priority toxic pollutants, which are of particular concern and require specific control mechanisms. These conventional pollutants are commonly found in industrial wastewater discharges and vehicle emissions, with negative effects on human health and the environment.
Characteristics of Conventional Pollutants
| Characteristics | Values |
|---|---|
| Number of categories | 5 |
| Presence determined by measuring | Biochemical oxygen demand, total suspended solids, pH levels, fecal coliform, oil and grease |
| Biochemical oxygen demand (BOD) | Quantity of oxygen required by microorganisms to stabilize five-day incubated oxidizable organic matter at 68°F (20°C) |
| BOD is a measure of | Biodegradable organic carbon and oxidizable nitrogen |
| BOD sum | Sum of the oxygen used in organic matter synthesis and in the endogenous respiration of microbial cells |
| Total suspended solids | Interfere with the transmission of light |
| Oil and grease | Designated as a conventional pollutant on July 30, 1979 |
| Limits for oil and grease based on | LC50 values |
| LC50 definition | Concentration at which 50% of an aquatic species population perishes |
| EPA criterion | 96-hour exposure, concentration of individual petrochemicals should not exceed 0.01 of the LC50 median |
| Criteria pollutants | Particulate matter, ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, lead |
| Criteria pollutants cause | Adverse health effects, reduced lung function, aggravate asthma, increase chances of respiratory illness, permanent lung damage, damage to plants and crops, reduced visibility, damage to animals and buildings |
| Sources of criteria pollutants | Burning of fossil fuels, burning of fuels in utility and industrial boilers, automobiles, trucks |
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What You'll Learn
Conventional pollutants are water pollutants
In the United States, conventional pollutants refer to water pollutants that can be treated by a municipal sewage treatment plant. The Environmental Protection Agency (EPA) has amended and defined a basic list of conventional pollutants in the U.S. Clean Water Act.
Conventional pollutants fall into five categories, with their presence determined by measuring:
- Biochemical oxygen demand (BOD)
- Total suspended solids (TSS)
- PH levels
- Fecal coliform
- Oil and grease
Biochemical oxygen demand (BOD) is the quantity of oxygen required by microorganisms to stabilize five-day incubated oxidizable organic matter at 68°F (20°C). BOD is a measure of biodegradable organic carbon and, at times, oxidizable nitrogen. It is the sum of the oxygen used in organic matter synthesis and in the endogenous respiration of microbial cells.
The EPA identifies the best available technology that is economically achievable for a given industry and sets regulatory requirements based on the performance of that technology. The Effluent Guidelines do not require facilities to install particular technology identified by the EPA. However, the regulations mandate that facilities achieve the regulatory standards developed based on a specific model technology.
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They are treated by municipal sewage treatment plants
Conventional pollutants are water pollutants that can be treated by municipal sewage treatment plants. The US Environmental Protection Agency (EPA) has defined a basic list of conventional pollutants in the Clean Water Act, which has been amended in regulations issued by the EPA. The five categories of conventional pollutants are determined by measuring biochemical oxygen demand, total suspended solids, pH levels, the amount of fecal coliform, and the quantity of oil and grease.
The presence of these pollutants is measured in different ways. Biochemical oxygen demand (BOD) is the quantity of oxygen required by microorganisms to stabilize five-day incubated oxidizable organic matter at 68°F (20°C). BOD is a measure of biodegradable organic carbon and, at times, oxidizable nitrogen. Total suspended solids interfere with the transmission of light. The EPA has set national discharge standards for BOD, pH, and TSS, which are applicable to sewage treatment plants in the US.
The EPA also regulates the quantity of oil and grease in conventional pollutants, with limits based on LC50 values, or the concentration at which 50% of an aquatic species population perishes. During a 96-hour exposure period, the concentration of individual petrochemicals should not exceed 0.01 of the LC50 median. Oil and grease contaminants vary in physical, chemical, and toxicological properties, and they originate from different sources.
The EPA identifies the best available technology that is economically achievable for treating conventional pollutants and sets regulatory requirements based on the performance of that technology. While the Effluent Guidelines do not require facilities to install the particular technology identified by the EPA, the regulations require facilities to achieve the regulatory standards developed based on a particular model technology.
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The EPA identifies and regulates these pollutants
In the United States, a conventional pollutant is a term used to describe a water pollutant that can be treated by a municipal sewage treatment plant. The Environmental Protection Agency (EPA) identifies and regulates these pollutants through the Clean Water Act (CWA) and the National Pollutant Discharge Elimination System (NPDES). The EPA sets regulatory requirements based on the performance of the best available technology that is economically achievable for a particular industry. For example, the EPA designated "oil and grease" as a conventional pollutant in 1979.
The EPA has identified 65 pollutants and classes of pollutants as "toxic pollutants", with 126 specific substances designated as "priority" toxic pollutants. These priority pollutants are a set of chemical pollutants that the EPA regulates and for which it has published analytical test methods. The Priority Pollutant List makes the list of toxic pollutants more usable and practical for the purposes assigned to the EPA by the CWA. The list includes individual chemical names, making it more practical for testing and regulation than the open-ended groups of pollutants on the toxic pollutants list.
The EPA also establishes Best Conventional Pollutant Control Technology (BCT) limitations after considering a two-part "cost-reasonableness" test. The initial BCT methodology and some BCT effluent limitations were published in 1979, with revisions made in 1986. In addition, the EPA developed Effluent Guidelines for the Steam Electric Power Generating Category, which included a Priority Pollutant List to support regulations for that category.
The EPA considers a wide range of pollutants, including toxic, conventional, and nonconventional pollutants, when developing Effluent Guidelines. The Clean Air Act requires the EPA to set National Ambient Air Quality Standards (NAAQS) for six commonly found air pollutants known as criteria air pollutants, which can harm human health, the environment, and cause property damage. The EPA works with state, tribal, and local air agencies to attain these standards throughout the country.
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Pollutants include biochemical oxygen demand, total suspended solids, pH levels
Conventional pollutants are defined by the EPA as toxic pollutants, with 126 specific substances designated as "priority" toxic pollutants. All other pollutants are considered “nonconventional”.
Biochemical oxygen demand (BOD) is an analytical parameter that represents the amount of oxygen consumed by aerobic bacteria as they break down organic material in a water sample at a specific temperature over a specific time. BOD is used to measure the degree of organic water pollution. The higher the BOD, the more rapidly oxygen is depleted in the water, which means less oxygen is available for aquatic life.
Total suspended solids (TSS) refer to the concentration of suspended substances in water. When suspended solids exceed expected concentrations, they can negatively impact a body of water. Suspended solids can be organic or inorganic and are often attributed to human influence. Organic suspended solids, such as sewage effluent, can decrease dissolved oxygen levels as they are decomposed and can contain harmful bacteria, protozoa, and viruses.
The pH value of a water source is a measure of its acidity or alkalinity. A change in pH can harm or kill plants and animals in the environment. When the pH is around 6.0 to 7.0, there is a high level of biodiversity within the ecosystem. As the pH decreases and the acidity increases, fewer organisms can survive.
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Oil and grease are also conventional pollutants
In the context of environmental pollution, conventional pollutants are water pollutants that can be treated by municipal sewage treatment plants. The Clean Water Act (CWA) section 304(a)(4) identifies the following as conventional pollutants: biochemical oxygen demand (BOD5), total suspended solids (TSS), fecal coliform, pH, and any additional pollutants the Environmental Protection Agency (EPA) defines as conventional.
Oil and grease are also designated as conventional pollutants by the EPA. This classification includes fats, oils, waxes, and other related constituents found in water, particularly wastewater. These compounds can interfere with biological life in surface waters and create unsightly films if not removed before the discharge of treated wastewater. Oil and grease can enter wastewater through various sources, such as butter, lard, margarine, vegetable fats and oils, meats, cereals, seeds, nuts, and certain fruits, and petroleum-derived products like kerosene, lubricating oils, and road oils.
The hydrophobic nature of oil and grease compounds poses challenges in sample collection and analysis. EPA method 1664 employs n-hexane as the extraction solvent for oil and grease, as well as other extractable materials that are not adsorbed by silica gel in various water types and waste streams. The previous methods, EPA 413.1 and 418.1, utilised Freon (CFC-113) as the extraction solvent. N-hexane was selected as the alternate solvent due to its ability to closely replicate the results of Freon extractions.
The analysis of oil and grease in water samples is crucial for monitoring and regulating this conventional pollutant. The preservation of samples, verification of pH, and extraction processes are all essential steps in quantifying and addressing the presence of oil and grease in water.
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Frequently asked questions
Conventional pollutants are water pollutants that can be treated by a municipal sewage treatment plant. They fall into five categories: biochemical oxygen demand, total suspended solids, pH levels, the amount of fecal coliform, and the quantity of oil and grease.
Some examples of conventional pollutants include sewage, oil and grease, and industrial waste.
The Environmental Protection Agency (EPA) regulates conventional pollutants through the National Pollutant Discharge Elimination System (NPDES) permits, which set standards for direct dischargers that release pollutants into waters in the United States.
