Water pyrolysis waste

Table-4 Raw and Treated Water Quality of Pyrolysis Waste Water (HIg)...

Gobbels FJ, Ptittmann W (1997) Structural investigation of isolated aquatic fulvic and humic acids in seepage water of waste deposits by pyrolysis-gas chromatography/mass spectrometry. Wat Res 31, 1609-1618. 

Alternative proeesses for the reeyeling of fibre-reinforeed plastie (FRP), and their applieation in Japan, are briefly reviewed. Pulverised waste has been used in plastie mouldings for automotive applieations, and in eement roof tiles. FRP may be burned in ineinerators and used to heat water, or as an additive to eement kilns, where the resin aets as a fuel and the glass and filler beeome eement raw materials. Pyrolysis, in eonjunetion with metal eatalysts, has been used to reduee the waste to oils or gases, and treatment with steam or supereritieal water has also been sueeessfully applied. 26 refs. 

After combustion or pyrolysis the waste can sometimes be used as a filler in making concrete roads or blocks. It can be compacted and disposed of as landfill, put in the ocean, or deposited in some underground mine. Care must be taken that any leaching that may occur after final disposal will not introduce any hazardous or noxious substances into the air or the water. 

A major advantage of plasma processing is that the heat input may be accomplished in an atmosphere of any desired composition and reactivity. In practice there are only a few variations of chemical strategies available for thermal processing i.e. pyrolysis, oxidation, reactions with hydrogen and water. They were already reported elsewhere [5]. The most cost effective and friendly to the environment are the approaches of plasma employing for zero-waste fuel generation or for zero-waste incineration. 

Biorefineries New catalytic pretreatment of plant materials Valorization, pretreatment or disposal of co-products and wastes from biorefinery by catalytic treatments New and/or improved catalytic processes for chemicals production through the integration of the biorefinery concept and products into the existing chemical production chain New advanced catalytic solutions to reduce waste emissions (solid, air and, especially, water) New catalysts to selectively de-oxygenate products from biomass transformation Catalysts to selectively convert chemicals in complex multicomponent feedstocks New biomimetic catalysts able to operate under mild conditions Small catalytic pyrolysis process to produce stabilized oil for further processing in larger plants... 

The biomass pyrolysis is attractive because sohd biomass and wastes can be readily converted into hquid products. These liquids, as crade bio-oil or slurry of charcoal of water or oil, have advantages in transport, storage, combustion, retrofitting and flexibihty in production and marketing. 

Ou, H., Y. Zhang, Q. Wu, J. Fang, and Y. Shu. 2004. Rapid determination of trace inorganic and total organic mercury in waste water by cold vapor atomic absorption spectrometry and pyrolysis atomic absorption spectrometry. Fenxi Ceshi Xuebao 23 68-70. 

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. 

Description Feeds are sent to USC cracking furnaces (1). Contaminants removal may be installed upstream. A portion of the cracking heat may be supplied by gas turbine exhaust. Pyrolysis occurs within the temperature-time requirements specific to the feedstock and product requirements. Rapid quenching preserves high-olefin yield and the waste heat generates high-pressure steam. Lower temperature waste heat is recovered in the downstream quench oil and quench water towers (2) and used in the recovery process. Pyrolysis fuel oil and gaso-... 

Let us consider that a mixed waste contains different components, each being characterized by its water content W, volatile matter VM and ash content A (the last two being on a dry basis). Assuming that each component behaves independently and using the hypothesis of additivity, it is possible to estimate the product yields after carbonization. Moreover, this model takes into account the different carbonization yields for each component (according their physical and chemical properties). From the C, H, O analysis of each component (easier than that for the rough mixture), it is possible to estimate the net calorific value of the char and the gases from the waste pyrolysis. 

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