Wastewater treatment, also called sewage treatment, the removal of impurities from wastewater, or sewage, before it reaches aquifers or natural bodies of water such as rivers, lakes, estuaries, and oceans. Since pure water is not found in nature (i.e., outside chemical laboratories), any distinction between clean water and polluted water depends on the type and concentration of impurities found in the water as well as on its intended use. In broad terms, water is said to be polluted when it contains enough impurities to make it unfit for a particular use, such as drinking, swimming, or fishing. Although water quality is affected by natural conditions, the word pollution usually implies human activity as the source of contamination. Water pollution, therefore, is caused primarily by the drainage of contaminated wastewater into surface water or groundwater, and wastewater treatment is a major element of water pollution control.
What Is a Root Canal?
A root canal is a treatment used to repair and save a tooth that is badly decayed or infected. A tooth’s nerve and pulp can become irritated, inflamed, and infected due to deep decay; repeated dental procedures on a tooth; or large fillings, a crack, or chip in the tooth. It also can happen because of trauma to the face.
During a root canal procedure, the nerve and pulp of the tooth are removed and the inside is cleaned and sealed. Without treatment, the tissue surrounding the tooth will become infected and an abscess may form.
A tooth’s nerve is not vitally important to a tooth’s health and function after the tooth has come through the gums. Its only function is sensory — to give the sensation of hot or cold. The absence of a nerve won’t affect how your tooth works.
Root canal procedures