Water pollution, pyrolysis

Solid wastes differ from air and water pollutants since these wastes remain at the point of origin until a decision is made to collect and dispose of them. There are several means of disposal available including recycling, chemical conversion, incineration, pyrolysis, and landfill. Federal regulations, local conditions, and overall economics generally determine which method is the most acceptable. 

Pyrolysis units are expected to have minimal air pollution impacts because most of the pyro-gas generated in the pyrolysis process is burned as fuel in the process. During burning, the organic compounds are destroyed. Assuming complete combustion, the decomposition products are water, carbon dioxide, carbon monoxide, sulfur dioxide and nitrogen oxides ... 

Pyrolysis in supercritical water [67, 68] owing to the many special characteristics of supercritical water, waste plastics can be degraded efficiently in supercritical water, which has recently received great attention has been studied comprehensively. This technology can not only realize the recovery of valuable products from waste plastics, but also provide a solution to the ever-growing energy crisis and environmental pollution. No catalysts or reaction agents are needed here, so the cost is very low. 

Porous carbon materials are used for many applications in various industrial or domestic domains adsorption (air and water purification, filters manufacture, solvents recovery), electrochemistry (electrodes for batteries, supercapacitors, fuel cells), catalyst support (industrial chemistry, organic synthesis, pollutants elimination),. .. Porous carbons used at the present time are generally activated carbons, i.e. materials prepared by pyrolysis of natural sources, like fhiit pits, wood or charcoal. Pyrolysis is followed by a partial oxidation, under steam or CO2 for instance, leading to the development of the inner porosity. 

---