![]() ![]() Different types of sand collectors can be used that may employ aeration to carry fats and oils to the water surface, or centrifugal force to separate water from other materials.Ī further slowing of the wastewater speed is performed by widening the basin as the water enters a primary treatment tank. In this step, the speed of the wastewater is slowed to allows these sediments to settle out of the water and collect at the bottom of the tank. A special sedimentation tank is used to remove coarse particles such as stones, pieces of glass, sand, or any uncaptured organic material. The next step will typically be to send the wastewater to a sand collector process. Any debris that has been collected on the screens is sent to other process steps where the material gets dewatered and then incinerated. The speed with which the wastewater flows through the screens at each step is carefully controlled to assure the effectiveness of the screening process. A series of screens are used with various degrees of fineness from several centimeters down to a few millimeters to screen out coarse contaminants in the water. First, the wastewater is directed to a screen or a sieve drum that filters out impurities that are relatively coarse, such as leaves, textiles, paper, or other large materials. The initial stage of wastewater treatment involves mechanical processes, which remove some 20-30% of solids in the water. Mechanical Wastewater Treatment Processes This article will review the basics of these stages of wastewater treatment processes followed by a more in-depth look at the chemical-based treatment of wastewater. Wastewater treatment involves a number of stages involving processes that are mechanical (physical)-based, biological-based, chemical-based, as well as membrane (filtration) processes. The primary objective of wastewater treatment processes is to purify the water and make certain that it is safe for subsequent use once it has been returned to the environment as part of the water cycle. Some wastewaters from industrial or agricultural processes may also contain chemicals that may be hazardous to the environment or to public health and which need to be neutralized or removed from the water before it can be safely reintroduced into the environment. ![]() This material may include excrement, detergents from washing clothes and dishes, food scraps, grease, oils, plastics, salts, sand, grit, and heavy metals. ![]() Generally, wastewater contains around 99.9% water by weight with the remaining 0.1% representing dissolved solids or other suspended materials. Wastewater originates from homes, businesses, industry, as well as storm drains and rainwater runoff. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |