Sewage

Many people use water every day. This water becomes dirty as it flows away.

It comes from sinks, baths, and toilets.

Some water is called greywater. This is from washing dishes or clothes. Other water is called blackwater. This comes from flushing the toilet.

This dirty water travels through pipes. These pipes are called sewers.

They carry the water to a special place.

Sewers can also carry rain from storms. This water can pick up trash from streets. The water then flows into the pipes.

We must clean this water. Cleaning it keeps our lakes and oceans safe.

It is a very important job.

Sewage is dirty water made by people. It comes from homes and businesses. This includes schools, hospitals, and stores.

There are two main types of sewage. Greywater comes from sinks, baths, and laundry. Blackwater comes from flushing toilets. It carries human waste away. Sewage also has soap and food bits in it.

Most sewage is 99.9% water. The rest is made of tiny solids. These solids can be organic matter. This is stuff like proteins and oils. Sewage also has nutrients like nitrogen and phosphorus. If we do not clean it, these can harm lakes. This can lead to eutrophication, which is a way that water gets polluted.

Sewage can also carry pathogens. Pathogens are tiny germs that can cause sickness. These include bacteria, viruses, and even small worms.

We use pipes called sewers to move it. Some sewers carry rain from storms too. We must treat the water before it goes back to nature. This keeps our water bodies safe.

Sewage is the wastewater created by a community of people. It comes from many places like homes, schools, and hospitals.

This water is moved through a system of pipes called sewers. There are two main kinds of sewage found in these systems. Greywater comes from things like showers, sinks, and laundry machines.

Blackwater is the water used to flush toilets. It carries human waste away from our living spaces. Sewage also contains soaps, detergents, and sometimes food waste from dishwashers.

Most sewage is actually made of water. It is about 99.9% pure water. The remaining 0.1% is made of solid matter.

These solids can be dissolved or they can be suspended in the liquid. About one-third of the solids are held up by turbulence. The rest are either dissolved or very tiny particles called colloids. Some of this solid matter is organic. This includes things like proteins, carbohydrates, and oils. We can measure how much organic matter is there using methods like Biochemical Oxygen Demand. This is also called BOD.

Sewage can also carry tiny living things called pathogens. These are germs that can cause sickness.

There are four main types of pathogens in sewage. These include bacteria, viruses, protozoa, and helminths. Helminths are small worms that can exist as eggs. Scientists often look for a specific bacteria called Escherichia coli. This is also known as E. coli. It is an intestinal bacteria found in all warm-blooded animals. Finding high amounts of E. coli helps experts know if there is fecal contamination.

Many different things can change how sewage looks and acts. The amount of sewage made usually matches how much water people use. Factors like climate and water cost can change this. For example, warmer climates might lead to more water use. Sewage also contains nutrients like nitrogen and phosphorus. If this is not cleaned, it can cause eutrophication in lakes. This is a process where too many nutrients pollute the water.

This can hurt the living things in the water.

We must manage sewage carefully to keep our world clean. It is collected and moved to treatment plants.

At these plants, the water is cleaned before it is released. It can be released into the soil or into water bodies. Some people even reuse the treated water for other tasks. There are different ways to dispose of it, like using land or marine outfalls. However, all these options can still carry a risk of water pollution. We must always work to keep our water safe for everyone.

Sewage, often called domestic wastewater, is the used water produced by a community of people. It is a complex mixture of water and various waste products. This wastewater comes from many different sources within a locality. These sources include private residences and commercial buildings. They also include institutional facilities like schools, hospitals, and prisons.

Managing this liquid is vital for public health and environmental safety. It must be collected and moved through a system of pipes.

Scientists divide sewage into two main sub-types based on their source. The first type is greywater. This is the wastewater from sinks, bathtubs, showers, dishwashers, and clothes washers.

The second type is blackwater. Blackwater is the water used to flush toilets. It carries human excreta, which includes feces and urine. Sewage also contains soaps, detergents, and food waste from dishwashing. In some areas, toilet paper is also added to the mix.

Most sewage is actually composed of water. It is approximately 99.9% pure water. The remaining 0.1% consists of solid matter. These solids can be dissolved or suspended in the liquid. About one-third of these solids are kept suspended by turbulence. The rest are dissolved or exist as tiny colloidal particles. Organic matter makes up a large part of these solids. This includes proteins, carbohydrates, oils, and grease. Scientists use two indirect methods to measure organic matter. These are called Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).

Sewage also contains nutrients like nitrogen and phosphorus. Nitrogen often comes from ammonia, which stems from urea in urine. Phosphorus is often found as phosphates from detergents. If untreated sewage enters lakes or reservoirs, it can cause eutrophication. This is a process where high nutrient levels lead to pollution. Sewage also carries pathogens, which are organisms that can cause disease. There are four main types of pathogens found in sewage. These include pathogenic bacteria, viruses, protozoa, and helminths, which are worms.

To check for fecal contamination, experts look for specific bacteria. They often track Escherichia coli, commonly known as E. coli. These are intestinal bacteria found in all warm-blooded animals. E. coli is easy to track because it exists in very high concentrations. You might find 10 to 100 million E. coli per 100 mL of sewage. Beyond germs, sewage can contain micro-pollutants. These include microplastics from synthetic clothing and pharmaceuticals excreted by humans. Some people even accidentally or intentionally pour oils and solvents into drains.

The amount of sewage produced depends on water consumption. Many factors influence how much water a person uses. Climate plays a role, as warmer climates may increase consumption. Economic levels and the size of a community also matter. The way water is priced or metered affects flowrates. In some regions, water is scarce, making the sewage more concentrated. In the United States, higher water use leads to more diluted sewage. This means the concentration of pollutants might be lower even if the total volume is higher.

Managing sewage requires careful collection and transport. Sewage travels from plumbing into either a sewer or an onsite facility. There are sanitary sewers, which exclude stormwater. There are also combined sewers, which take in both sewage and stormwater.

Once collected, it must be treated before release. Treatment makes the water compatible with local requirements. Disposal options include land disposal or using sewage farms. Some areas use marine outfalls to release treated water.

However, all disposal methods carry a risk of water pollution.