Wastewater Treatment: Pretreatment and Primary Sedimentation
Thick Grinding Lattices
At this stage, there are usually several lines. For the process, thick bars are installed with a clearance between plates of 30-50 mm and below (downstream) a fine grating with a clearance from 15 to 20 mm. The function of these bars is not to remove the sand but rather the solid minerals. When minerals do not provide solid, specific discharge (straw, hay, etc.), a finer grinding is required, called refining sieve or fine mesh of about 3-6 mm.
The forms in which the grids can
Read MoreGeological Time and Earth’s Processes: Dating, Weathering, Erosion, and Sedimentation
Geological Time
Geological time is the period between the origin of the Earth and today. It is measured in millions of years. Geologists have always tried to sort all the events chronologically, using two methods: absolute dating and relative dating.
Absolute Dating
Absolute dating consists of assigning a specific date to an event. Various methods can be used for absolute dating, the most common being the radiometric method. This method relies on the existence of unstable atoms that undergo radioactive
Read MoreRelief Formation and Landscapes of the Iberian Peninsula
Relief of the Iberian Peninsula
The relief found in the Iberian Peninsula is the result of a series of orogenic stages and erosion that have alternated over millions of years. There are three types of Iberia: siliceous, limestone, and clay.
Siliceous Iberia
First, in siliceous Iberia, there are Precambrian and Paleozoic materials (the oldest in the Peninsula). These are igneous or magmatic rocks (resulting from cooling lava) and metamorphic rocks (formed from the transformation of igneous and sedimentary
Read MoreKey Earth Science Terms: Definitions and Concepts
A
- Abrasion: Erosion caused by the sea, creating a flat coastal area.
- Albufera: A saltwater lake separated from the sea by a barrier island.
- Alcor: A hill used for control purposes (Andalusia).
- Altitude: The vertical distance of a point above sea level.
- Anticline: A fold curved downward; the convex part of a simple fold.
- Archipelago: A group of islands.
B
- Badlands: An area with an abundance of soft sediments heavily eroded by wind and water.
- Barranco: A landform characteristic of the Canary Islands; a narrow,
Volcanoes, Earthquakes, and Plate Tectonics: Earth’s Dynamics
Volcanoes
A volcano is any crack in the Earth’s surface through which incandescent material emerges from within.
Some well-known volcanoes are:
- Teide, Spain
- Vesuvius, Italy
- Parinacota, Chile
Some volcanoes are conical mountains, while others are in the deep sea and are shaped like cracks.
Why Do Rocks Melt?
At about 100 km depth, the temperature is 1300°C. Despite the high temperatures inside the Earth’s crust and mantle, rocks are in a solid state. The rocks melt due to:
- Temperature: In this area, it is
Waste Management: Types, Impacts, and Sustainable Solutions
Types of Waste
There are various types of waste, each with unique characteristics and disposal requirements:
- Agricultural: Stems, leaves, straw.
- Ranchers: Manure and slurry.
- Forest: Scrap wood, branches, thinning leaves, sawdust, wood chips, and remains of burnt wood from fires.
- Mining: Sterile mining byproducts.
- Industrial:
- Inert: Scrap, sand.
- Assimilated to urban: Plastics and papers.
- Toxic and hazardous: Chemicals.
- Radioactive: High-level or low-level waste.
- Municipal Solid Waste (MSW):
- Waste originating