Municipal Solid Waste

Waste in this instance defines any combustible, non-hazardous material resulting from the output of household and industrial processes. This represents a wide range of feedstocks, from construction waste to biosolids from sewage. The compounds and substances present in MSW cover a large proportion of the periodic table; and different technologies may be more or less appropriate for efficient conversion. DP offers several types of combustion and gasification technology in order to provide the best solution.   

Type of Municipal Solid Waste

  • Municipal Solid Waste (MSW) is typically the domestic types of waste from residential homes, institutions, small businesses and the like. As such, it can consist of organic (biodegradable) and non-biodegradable materials. It is typically known as ‘non-hazardous’ waste although there are categories within this which have specific hazardous characteristics. Some of the waste may also be recyclable. It differs from ‘hazardous’ industrial wastes and other toxic categories. Incineration of MSW is a mature technology for producing energy in many countries but the proper handling, combustion and control of emissions is critical to ensure environmental credentials. In many emerging economies, MSW is left untreated and disposed of through landfills or improper incineration. Increasingly, the use of MSW as an energy source is being adopted by rapidly developing countries that have a need for waste management as well as increased renewable energy production.
  • MSW can be sorted and treated by shredding and dehydrating to produce Refuse Derived fuel (RDF) or Solid/Specified Recovered Fuel (SRF). RDF consists largely of combustible components of municipal waste such as plastics and biodegradable waste and as such, has more consistent combustion characteristics than unsorted MSW.

Typical characteristics

  • There is significant variety in MSW characteristics depending on geographical location, season, and many other factors. Unsorted MSW will contain many varying materials of different composition, particle size; combustibility and moisture content. It is the more typical type of fuel to be found in emerging countries.
  • Chemical properties of MSW are very important in evaluating the alternative processing and recovery options and are measured in the following dimensions: Proximate analysis; Fusing point of ash; Ultimate analysis (major elements); Energy content

Implications

The variety in municipal solid waste (MSW) composition and differences in thermal degradation behaviour of MSW components makes the modelling, design and operation of thermal conversion systems a task that requires expertise and experience. The formation and composition of the fly ash and emissions are also a direct result of the input feedstock and must be properly understood to determine the correct process for conversion.

DP Cleantech provides the following
Municipal Solid Waste technologies