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Polyethyleneterephtalate (PET) is one of the most popular plastic materials used for various purposes, mainly for producing of bottles. Recycling of this material is known, but the ratio of recycled material is too low. With the lowering of primary resources, the PET could be used as a secondary source of carbon and hydrocarbons. One of the ways of processing the waste PET is pyrolysis under the specific conditions, which leads to decomposition of this material with two main products. First, it is a mixture of organic acids – terephtalic acid and benzoic acid with a ratio about 10:1. Those acids can be used in the chemical industry; terephtalic acid can be used for producing of brand-new PET. The second product is solid carbon, which can be used for various purposes, for example as the active carbon. Several experiments were accomplished with this carbon material under various conditions of its activation. Conditions of these experiments could affect the specific surface area of active carbon up to 1200 square meters per gram, and also the pore volume as well as the pore diameter.

All activities in a technically developed society are accompanied by waste generation. The question of its removal or consequent environment friendly and economic use has been dealt with by mankind since the early 1990s. The target of a common international project worked on by the Investex Group, .a.s. companies and the Research Institute for Brown Coal, the joint-stock company, is to look for ways to use the sludge from waste water treatment plants as an alternative resource for additive agent fabrication. Suitable waste treatment sludge for the additive agent preparation applied in the combustion of lower quality fossil fuels with a higher content of sulphur is generated as waste in ammonia fabrication from the sludge produced by municipal waste water treatment plants. The procedure in the agent fabrication from waste treatment sludge, the course of the combustion tests and the results of a theoretical level of desulphurization form the content of this paper.

When processing brown coal mined in the North Bohemian Basin, dusty types of low heating coal containing lots of ash are produced. This coal is difficult to sell. On the other hand when bituminous coal is produced, the waste is very fine, with a high calorific value, which is impossible to sell. World wide continuously increasing amounts of waste and their further processing is a big problem. For processing waste combined with coal the most suitable types of waste are those individual types of coal which use favourable qualities of reprocessed high-energy waste.

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