A significant portion of municipal solid waste, even in the most advanced methods of collecting and sorting waste is subjected to high temperature procession with a primary focus on combustion in mechanical grate furnaces. Prepared in collaboration with Simdean specialists, largely applying solutions, the article analyses the experience of using plasma technology for the processing of various types of waste. It is noted that to process solid waste disposal technologies are hardly used because of the higher maintenance and operating costs compared with layer combustion. The environmental benefits plasma gasification method are also obvious. Continue reading
Wind, an inexhaustible source of clean energy, is becoming more widely used at strategic level, rapidly gaining public support at the same time. Wind power has been used since ancient Babylon (wetlands drainage), Egypt (grain grinding) and China and Manchuria (pumping water from the rice fields) times. In Europe, this technology was introduced in the XII century, while the adoption of truly modern approaches started only in the XX century. Continue reading
The growing demand of both industrial towns and large cities in carports, caused by the high population density in the urban areas, throw designers together with a good number of challenges. The main objectives set to car park ventilation professionals are typically the following:
- Maintain the acceptable indoor air parameters
- Ensure decent fire resistance
- Implement an environment-friendly system
Covered parking facilities are usually located below the ground level and require the installation of mechanical ventilation in nine cases out of ten. Semi-covered parking constructions, as a rule, are comprised of frames with multiple floors, though a roof and exterior walls may be partially or completely absent. This is where a natural or mixed ventilation system can be installed (a combination of natural and mechanical systems can also be installed for sites with a large floor area).
Closed car park ventilation system performs the following functions:
- Maintains the allowable concentration of carbon monoxide (CO)
- prevents the formation of explosive concentrations of flammable gases
A solid scrap metal dealer is highly likely to buy virtually any kind of scrap metal; however, if you are looking to plunge into the business, undergoing a basic training is obligatory. Let’s start from the very beginning – the definition.
The large class of scrap metals is typically represented by a variety of obsolete metal products, collected for further processing. Scrap metals are subjected to melting procedure, and once this sub-mission is accomplished, the materials enter the manufacturing line iteratively. Generally, scrap metal is characterized by the types of metal it consists of: the predominant material in the overall composition of the scrap plays the decisive role. Furthermore, scrap metal is divided into particular categories in accordance with physical characteristics and chemical composition, the content of carbon or the amount of alloying elements.
Therefore, there are several categories to steel and iron scrap metals (stainless steel, cast iron, etc.), non-ferrous metals (copper scrap and alloys, such as brass, bronze, red brass), aluminum and its alloys, titanium and titanium alloys (ship and aircraft wastes), magnesium scrap (waste aircrafts), lead (batteries, cables); semiconductor scrap (provided by electronics industry); rare scrap metals (alloys provided by high-tech industries).
Precious scrap metal category is comprised of gold, silver and platinum metals. Jewelry, catalysts, batteries, crucibles and chemical apparatus constitute the greater part of precious scrap metals class. Since metal ore is identified as irreplaceable mineral, the idea of recycling and further processing despite of certain financial costs and the need for additional production facilities, is absolutely crucial for both the environment and the economy as a whole.