Glass production involves two main methods – the float glass process that produces sheet glass, and glassblowing that produces bottles together with other containers. It has been done in a variety of ways during the history of glass.
As with any highly concentrated industries, glassworks suffer from moderately high local environmental impacts. Compounding this is that because they are mature market businesses, they often realise been located on the same site for a long time and this has resulted in residential encroachment. The main impacts on residential housing and cities are noise, fresh water use, water pollution, NOx and SOx air pollution, and dust.
Noise is created by the forming machines. Operated by compressed air, they can clear noise levels of up to 106dBA. How this noise is carried into the local neighborhood depends heavily on the cut of the factory. Another component in noise production is truck movements. A typical factory will process 600 T of fabric a day. This means that some 600 T of raw material has to come onto the site and the same off the site again as finished product.
Water is used to cool the furnace, compressor and unused molten glass. Water use in factories varies widely; it can be as little as one tonne water used per melted tonne of glass. Of the one tonne, roughly half is evaporated to manage cooling, the rest forms a wastewater stream.
Most factories use water containing an emulsified oil to cool and lubricate the gob cutting shear blades. This oil-laden water mixes with the water outflow stream, thus polluting it. Factories usually have some category of water processing equipment that removes this emulsified oil to various degrees of effectiveness.
Nitrogen oxides are a natural product of the burning of gas in air and are shown in large quantities by gas-fired furnaces. Some factories in cities with particular air pollution problems will mitigate this by using liquid oxygen, however the system of logic of this condition the survive in carbon of 1 not using regenerators and 2 having to liquefy and transport oxygen is highly questionable. Sulfur oxides are present as a total of the glass melting process. Manipulating the batch formula can effect some limited mitigation of this; alternatively exhaust plume scrubbing can be used.
The raw materials for glass-making are all dusty material and are delivered either as a powder or as a fine-grained material. Systems for controlling dusty materials tend to be unmanageable to maintain, and given the large amounts of material moved regarded and identified separately. day, only a small amount has to escape for there to be a dust problem. Cullet broken or destruction glass is also moved approximately in a glass factory and tends to produce able glass particles when shovelled or broken.