Common sense explanation: The preservation method of rawhide is similar to that of salted fish and bacon (adding salt), so it has the smell of salted fish. The smell of plastic seems to be the smell of chemicals. leather and chemical materials contained in leather wastewater.
Explanation of the process: The smell of salted fish is the same as above;
Plastic smell ( complex ingredients):
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1. The chemical material itself: Cr powder (chromium powder) with strong smell. Gray water odor (containing alkali sulfide, sodium hydrosulfide, ammonium salts and sulfur-containing gases (H2S, SO2, NH3) produced during descaling, volatilization of formic acid, of certain synthetic tannins or acidified fats (acrylic acid, grease, etc.) Volatiles The most dangerous place is when one of the descaling + stripping processes will produce a large amount of H2S, SO2, NH3, and mixture offormic acid. Do not breathe them nearby for a long time :)
2. Leather The smell is emitted when the waste is not treated immediately.
{If you have a family , or you want to make a name for yourself in this industry} It's okay if you smell the smell for a long time (1-5 years), (because the distance is still far) The operators are too close to each other from others for a long time (more than 6 years), there will definitely be a big problem, but to be honest, I worked in a tannery for 5 or 6 years, and I managed to get by. after 5 or 6 years, I won't do it in the future. You have to feel it up close. Living inside the factory is fine...it's relatively harmless {but it has a greater impact on human fertility, especially women.
Compared to other industries, this pollution is quite significant. But compared to the sister chemical industry, air pollutionof the leather industry is relatively low. your questions
:)
A thermal power plant is a factory that uses coal, oil and natural gas as fuel to produce electrical energy. Its basic production process is as follows: fuel is burned in the boiler to heat water into steam, and the chemical energy of the fuel is converted into thermal energy, and the steam pressure drives the turbine steam to rotate, and the thermal energy is converted into mechanical energy, then the steam turbine. spins the generator, converting mechanical energy into electrical energy. Thermal power plants are classified as follows: According to fuel: coal-fired power plants, oil-fired power plants, gas-fired power plants, waste heat power plants, power plants using garbage and industrial waste as fuel; temperature :the working fluids in the boiler are It is water. The critical parameters of water are: 22.064 MPa and 373.99 ℃ At this pressure and temperature, the density of water and steam is the same, which is called the critical point of water. The pressure of the working fluid in the furnace is less than this pressure and is called subcritical boilers, pressures higher than this are called supercritical boilers. The steam temperature in the oven is not lower than 593°C or the steam pressure is not lower. than 31MPa, which is called ultra-supercritical.
Medium and low pressure power plants (3.92 MPa, 450 degrees), high pressure power plants (9.9 MPa, 540 degrees), ultra high pressure power plants (13.83 MPa , 540 degrees), subcritical pressure power plants (16.77 MPa, 540 degrees), supercritical pressure power plant (22.11 MPa, 550 degrees), it was built on a scalee international and national;Regarding the selection of parameters of supercritical or ultra-supercritical units completed or under construction, there is no strict limit for supercritical and ultra-supercritical units. Right now it's just the height settings. at home and abroad, as long as the temperature of the main steam reaches or exceeds 600°C, it is regarded as an ultra-supercritical unit. According to the prime mover: condensing steam turbine power plant, gas turbine power plant, internal combustion engine power plant, steam-gas turbine power plant, etc. depending on the energy produced, condensing steam plant (only produces electricity), thermal; power plant (produces electricity and heat); According to the installed capacity of power plants: small capacity power plants (less than 100 MW), medium capacity power plants (100-250 MW), hundredlarge and medium capacity power plants (250-1,000 MW), large capacity power plants (above 1,000 MW); thermal power plants. There are several types of wastewater produced: industrial wastewater, domestic wastewater, coal-containing wastewater, and acid-base wastewater. classification, and the processes are also different.