There is a growing global trend toward urbanization. The growth of cities as the employment opportunities that exist within those urban areas has resulted in a mass migration towards high-density urban areas. However, this same migration is providing not only increased opportunity for individuals – but also logistical challenges for those who manage the garbage treatment plant within those environments. The sheer volume of waste that is generated within the boundaries of these increasingly densely populated urban environments has motivated the development of technologies and logistical approaches that will allow cities to sort and dispose of the mountains of waste that accumulate on a daily basis.
There are several different approaches to dealing with this challenge, especially during the sorting stage when underpins how each type of waste material will be finally processed.
The first of these methods sorts waste by size. This method employs drum screens (also known as a ‘Trommel Separator’). The waste is fed into a rotating drum which has a perforated screen. The waste is filtered by size – with the smaller particles falling through the screen while larger particles of waste remain in the drum.
The increasing amounts of metallic waste generated within the urban environment call for innovation in the separation of ferrous and none ferrous waste. One of the methods of accomplishing this is to use an ‘Eddy Current Separator’ which uses a magnetic field to operate the two types of metal waste. A second method to separate the two types of metals is ‘Induction Sorting’. Using this method material is sent along a conveyor belt which has sensors below it. these sensors identify metals of various types and those are then sorted using high-pressure jets of air to place them in appropriate containers.
These methods are tremendously useful given the fact that there is a ready international market for ferrous metals which are melted and reused in a variety of industrial and commercial sectors. For more: https://bestonsortingmachine.com/urban-solid-waste-management-project/.
One of the most effective and advanced waste systems uses infrared light to sort waste of various types. The system uses ‘Near Infrared Light’ which is shined on waste material. Depending on the reflected light that material is then classified and sorted. A similar system that uses x-rays is also in use.
However, one of the most common ways of sorting waste remains manual sorting. this employs large numbers of employees who receive training in the identification of various types of waste and how to sort them into distinct categories. Often the material to be sorted has passed through a shredder prior to manual sorting in order to enable easy handling. Manual sorting is also commonly used as a step in the recycling of paper and plastic material. there are several advantages to this method. The employment costs for the garbage sorting machine are low – and in many instances, only very basic training is required. however – this method has come under fire due to possible health impacts on the workforce.
As the world becomes increasingly urbanized and the demand for raw materials increases the waste sorting will become increasingly important – and innovation continues at a fast pace, which it will have to in order to cope with population pressures.