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WASTE AND ENERGY MANAGEMENT PLAN IN DHAKA CITY (BANGLADESH)

IMG 6343

The purpose is to draw up a strategic/decision-making

tool which include analysis about different technological aspects and about adequacy of the proposed intervention.
In particular, we define the technological and logistics

contents of the plant that we believe which is suitable for

maximizing the recovery of materials and energy from the

huge quantity of Municipal Solid Wastes which are treated

and conferred to the platforms of Aminbazar and Mutuail.

Due to the need to identify the social, economic and

environmental sustainability of this kind of intervention we

have considered to proceed a full evaluation of all the components and the design variables, even if the evaluation is inevitably brief.

In this specific case it is fundamental the coordination of the project with appropriate policies to encourage the waste collection as much separate as possible. At the same time, it has to be clearly defined the catchment areas and the collection and waste treatment procedures, that is to say it has to be unmistakably identified prospects and continuity of the material’s supply in the case of high variability of waste transfer's demand  to landfill. The problem of waste's composition modification compels to modify technological solutions (both quantitatively and qualitatively) with those may be available on the local context.

The complexity of such a process is related to several issues. Although the technological cycles are relatively known, the "raw materials/waste" represents the main unknown factor, in terms of quantity, composition and origin. The waste supply could be indeed a huge problem due to distances of the supply sites, continuity of supply and changes in behaviours of the public/users.
The main objectives are to build a modern plant using the best technology available in the market and to minimize impact on the environment connected to the new settlements.

With reference to the criteria used for the choice of area, it has been also assessed:
- environmental factors such as, for example, the environmental characteristics of the site, the actual use of the land, the natural features of territory, the surface hydrology, the impact mitigation possibility;

- techno-economic factors such as the proximity to consumers for the reuse of the energy produced and the distribution of industries in the territory;
- social factors such as the sensitivity degree of the resident population to environmental issues, the isolation degree and the distance from residential centers, any degrading situations already existing, the offered possibilities to protect the settlements system;

- infrastructure factors such as the roads available for the site, the proximity to the main connection arteries among the urban areas/villages of the interested energy basin, the already existing infrastructures which can be used also for the traffic of the plant.
Every evaluation on the possible operational scenarios was performed taking into account the quantities and product composition of waste streams as shown in Table 1.

Any changes that can significantly modify the project background must be taken into account in the programming and design activities of the intervention.

  Tabella  Grafico2

The contract considers the landfilling of undifferentiated waste from the DCC and in this operating context it is crucial to plan a radical change in methods of waste delivery through differentiation and specialization of collection processes (e.g. encouragement of separate collection through a green price which is applicable to virtuous behaviour).

You must therefore distinguish between two different operational scenarios. The second represents the natural evolution and continuation of the first one:
- SCENARIO 1, waste pre-treatment and subsequent sending of the organic fraction to composting and sending of the dry fraction to further pre-treatments (screening, bio stabilisation, etc.) for the subsequent incineration or landfilling (in this case it is extremely difficult the recovery and the reuse of recycled waste);

- SCENARIO 2 Full activation of separate collection facilities. This evolution of the collection process allows the specialization of the treatment's chains  by integrating the existing plants with specific lines of selection of paper, metals, plastics, etc.

Given the importance of separated collection and recycling circuits, this Report has a specific section for the planning and description of the service.
In the Figure 1 it has been schematically shown a possible integrated waste management’s system

It should also be considered that the activities of construction and commissioning of the plants will surely lead to the transformation of the habits and social and environmental behaviour of such a territorial framework strongly influenced by the anthropic activity where the methods of collection and waste management are significantly different in comparison with the western standards.

Grafico

 

 foto aerea Amin Bazar   foto aerea Matuail

     IMG 6263 IMG 6267

 

Simbolo PDF Waste treatment and energy plants

 

 

 

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