Construction Waste Management

Construction waste management.

1. CONSTRUCTION AND DEMOLITION OF LITHUANIA AND THE EUROPEAN UNION

Figure 1 shows that the three construction phases alternately overlap with one another due to the construction of works in the field of technology of the time identity. This determines the worksite versatility during which different specifications crews can carry out construction work at the same time[1].

Burning fluidized bed method. This technology is called the firing "fluidized" bed combustors. Using this waste incineration technology is completely different type of furnace. Normal grate (grill) are replaced by the basis of inert solid particles mixed with the waste (Figure 2). In the bottom of the air necessary for combustion is fed, and the combustion of waste generated "cooking" impression.

Fuel in this case the waste burns throughout "boiling" of the interior. Base-inert, high temperature resistant material. Can be used in sand, lime or even ash. If necessary, together with the air into the combustion chamber can be fed and flammable gas [2].

Disadvantages. Using this method should be burning the waste of approximately equal size and calorie particles. Therefore, before burning mixed waste, they should be well chopped and mixed. Using this technology close to the reception, storage, blending, and grinding equipment is needed. This additional processing increases the burning price. In addition, the construction of smaller companies, which are less cost effective. The application of this technology in waste energy not used often [2].

Benefits. This technology is more suitable for smaller enterprises - less a scandal to the public. It is also very suitable for the destruction of hazardous waste - often used in the medical, veterinary, infected waste disposal. You can reach very high temperatures - 1500- 2000oC, which very effectively broken down even most stable organic compounds. However, the combustion temperature limit of combustion generated ash melting temperature at which the ash to fuse into a solid mass, thus causing a variety of problems (severe removal shall be borne by the technological equipment surfaces, reduces the oxygen supply, etc.). This technology is very suitable burn and lower -calorie, moist, and even hard- combustible waste. In this case, together with the waste burned and additional high-calorie fuel [2].

Waste incineration in rotary kilns. It's about a 30 ° angle to the horizon inclined, slowly rotating around its axis, the long tubular furnace ( Figure 5) . They are used in some building materials, mineral products, production technologies, such as, cement factories. These furnace bottom fed fuel ( eg, oil or gas is injected ) and from top to bottom along with the combustion air slowly moving cement building components or incinerating waste. While moving down the waste (or components of cement) dries, and then burned at very high temperatures (1500 - 1800oC). The combustion of waste can and cement production. In this case, incinerated waste residues (ash, slag) cement component [2].