### Sewage Cleanup Service **Sewage cleanup** services are essential for maintaining public health and protecting the environment. Raw sewage contains bacteria, viruses, and other harmful contaminants that can cause disease. Sewage cleanup services remove these contaminants from wastewater so that it can be safely discharged into the environment. ### Sewage Treatment **Sewage treatment** is a complex process that involves several stages. The first stage is primary treatment, which removes physical contaminants such as solids and debris from the wastewater. The second stage is secondary treatment, which uses biological processes to remove organic matter from the wastewater. The third stage is tertiary treatment, which removes additional pollutants, such as nutrients and heavy metals, from the wastewater. ### What Happens to the Leftover Sewage Sludge? After sewage has been treated, it leaves behind a solid waste known as sewage sludge. Sewage sludge is composed of organic matter, bacteria, and other solids. It can be disposed of in several ways, including: - **Landfilling:** Sewage sludge can be disposed of in landfills. However, this method is becoming less common due to concerns about groundwater contamination. - **Incineration:** Sewage sludge can be incinerated, which reduces its volume and destroys harmful pathogens. However, incineration can also produce air pollution. - **Land application:** Sewage sludge can be applied to land as a fertilizer. However, this method must be carefully managed to avoid contaminating soil and groundwater. - **Anaerobic digestion:** Sewage sludge can be digested anaerobically, which produces biogas that can be used as a renewable energy source. Anaerobic digestion also reduces the volume of sewage sludge and stabilizes it for land application.