FOG in sewer refers to Fats, Oils, and Grease that enter the sanitary sewer system. These substances come from various sources, primarily from food preparation and disposal.
Sources of FOG in Sewers
FOG originates from both residential and commercial sources. Common examples include:
- Meat fats: Trimmings from meat preparation.
- Cooking oils: Vegetable oil, olive oil, and other cooking oils used for frying or sautéing.
- Shortening and Lard: Used in baking and cooking.
- Butter and Margarine: Used in cooking and as condiments.
- Gravy: A common byproduct of meat-based meals.
- Food products: Mayonnaise, salad dressings, sour cream, and other fatty foods.
Problems Caused by FOG
When FOG enters the sewer system, it can cause significant problems:
- Sewer Line Blockages: FOG solidifies as it cools, sticking to the inside of sewer pipes. Over time, this accumulation restricts flow and can lead to complete blockages.
- Sewer Overflows: Blockages caused by FOG can force sewage to back up into homes and businesses, or overflow into streets, parks, and waterways. These overflows are environmental hazards and can spread disease.
- Increased Maintenance Costs: Municipalities and wastewater treatment facilities spend significant amounts of money clearing FOG-related blockages and repairing damaged infrastructure.
- Equipment Damage: FOG can damage pumps and other equipment at wastewater treatment plants, leading to costly repairs or replacements.
Preventing FOG in Sewers
Several measures can be taken to prevent FOG from entering the sewer system:
- Proper Disposal: Never pour fats, oils, or grease down the drain. Instead, collect them in a container and dispose of them properly (e.g., in the trash after they solidify).
- Scrape Plates: Scrape food scraps, especially fatty residues, into the trash before washing dishes.
- Wipe Down Surfaces: Use paper towels to wipe grease from pots, pans, and cooking surfaces before washing.
- Use Strainers: Place strainers in sink drains to catch food particles and grease.
- Grease Traps (Commercial): Restaurants and other food service establishments are typically required to install and maintain grease traps or interceptors to prevent FOG from entering the sewer system.
Regulatory Measures
Many municipalities have implemented regulations and programs to control FOG discharge into the sewer system, including inspections, permitting, and enforcement actions. These regulations aim to reduce the negative impacts of FOG and protect public health and the environment.
