What is this passage mainly about ? *
How water is used in cleaning.
Why clean water is important.
How we can stop wasting water.
The process of cleaning wastewater.
What can be inferred about bacteria? *
They are dangerous in water.
They must be kept in water.
They cannot be killed with chemicals.
They can sometimes be helpful to us.
Which helps bacteria eat the tiny bits of solid waste? *
Air
Bugs
Chemicals
Wastewater
Why does wastewater need special treatment? *
To send it to the sewage treatment plant.
To make it have lots of bacteria.
To make it clean and usable.
To remove large objects from the water.
Respuestas
Respuesta: Drinking water supplies in the United States are among the safest in the world. However, even in the U.S., drinking water sources can become contaminated, causing sickness and disease from waterborne germs, such as Cryptosporidium, E. coli, Hepatitis A, Giardia intestinalis, and other pathogens.
Drinking water sources are subject to contamination and require appropriate treatment to remove disease-causing agents. Public drinking water systems use various methods of water treatment to provide safe drinking water for their communities. Today, the most common steps in water treatment used by community water systems (mainly surface water treatment) include:
Figure illustrating the water treatment cycle, showing coagulation, sedimentation, filtration, and disinfection
Figure courtesy of EPA
Coagulation and Flocculation
Coagulation and flocculation are often the first steps in water treatment. Chemicals with a positive charge are added to the water. The positive charge of these chemicals neutralizes the negative charge of dirt and other dissolved particles in the water. When this occurs, the particles bind with the chemicals and form larger particles, called floc.
Sedimentation
During sedimentation, floc settles to the bottom of the water supply, due to its weight. This settling process is called sedimentation.
Respuesta:
He puesto en parentesis mi opinion
Explicación:
What is this passage mainly about ? *
How water is used in cleaning.
Why clean water is important.
How we can stop wasting water.
The process of cleaning wastewater. (Me parece)
What can be inferred about bacteria? *
They are dangerous in water.
They must be kept in water.
They cannot be killed with chemicals.
They can sometimes be helpful to us. (OK)
Which helps bacteria eat the tiny bits of solid waste? *
Air
Bugs
Chemicals
Wastewater (Me parece)
Why does wastewater need special treatment? *
To send it to the sewage treatment plant.
To make it have lots of bacteria.
To make it clean and usable. (OK)
To remove large objects from the water.