Municipal solid waste utilizing applications

Overview

Plant description
Up to 50 % of the domestic waste in big cities end up in the wrong bins. There you can find residues with the pre-sorted light packagings and a lot of plastics are found in the household waste. Our contemporary sorting technology achieves very good sorting results to fractionate domestic waste into different potential recyclables. Here the question comes up whether it is still necessary to collect waste separately.
In Spain for example engineers have put into operation new conceptions of complete waste sorting plants which provide for both, the treatment of domestic refuste and the sorting of light packagings on a second line.
The material is to be sorted into different fractions by means of screening drums, magnetic and ballistic separators, near-infrared technology and/or manual sorting. All potential recyclables sorted out are passed on the further utilisation.
The screened organical material is processed into renewable energy by the means of further treatment technology, which is to be provided from special suppliers.

Biogas is being obtained by the process of biomethanisation. A heat block power station converts the biogas into electricity. The remaining organics are composted.

Conceptual reasons
The residual waste is containing a high proportion
of potential recyclables, which are passed to incineration unused. If these residues would be sorted, a lot of recources could be taken out.

Due to the production of renewable energies by biological waste treatment, an optimal efficiency of the used technology is guaranteed.
Domestic Waste Processing

INPUT: domestic waste

OUTPUT: shredded material < 300 mm (11'8'')

Domestic waste comprises solid wastes which accrue during the normally in private households and which are collected by the refuse collection service. Domestic waste is a part of municipal solid waste besides bulky waste, garden and construction waste.

Up to 50 % of the domestic waste in major towns and cities is not disposed off correctly. Therefore there is a large quantity of valuable materials in the residual waste, which would not be used but ends up in the waste incineration. If this waste passes through a sorting process, these resources can be utilized.

PLANT EXAMPLE

Input material: domestic waste
Throughput: 20 – 50 t/h
Output size: < 300 mm (11'8'')
Utilization output: thermal utilization, recycling

PROCESS DESCRIPTION (example)

The input material is charged into the shredder DW 3060 by wheel loader or excavator. During this step, a first pre-sorting is carried out and large contaminants such as metal and rocks can be sorted out.

The DW 3060 can be equipped with an optional comb extension, which ensures a consistant shredding. After the shredding, iron parts are separated by means of an overband magnet.

By means of the screen SM 518 or SM 620, the coarse and the fine fraction of the shredded material are separated. An optional windsifter could be installed above the coarse fraction.