Department of Biotechnology, Faculty of Life Sciences and Informatics, Balochistan University of Information Technology Engineering and Management Sciences, Quetta, Pakistan
Corresponding author details:
Nida Tabassum Khan, Faculty of Life Sciences and Informatics
Department of Biotechnology
Balochistan University of Information Technology Engineering and Management Sciences (BUITEMS)
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Solid waste treatment is an important part of ecological maintenance and pollution
control strategies that should be adopted to keep the environment clean and safe for the
inhabited living organisms. Several solid waste management and treatment methods have
been employed to ensure minimization of contaminant and its related contamination.
Different types of solid waste from different resources could be treated using different
methods such as incineration, composting, pyrolysis etc to reduce its unwanted
accumulation and its harmful impact on the environment.
Incineration; Composting; Agricultural solid waste; Sanitary Landfill; Pyrolysis
Solid waste is defined as the unsolicited or unusable solid materials produced by
manmade activities in suburban, developed or commercial areas . The process of
assembling and treating solid wastes is termed as solid waste treatment . Waste
management and recycling are the principal objectives of this treatment procedure . Solid
waste from different origin is altered and transformed into a useful resource that could be
utilized for human benefit .
Origin either industrial, domestic, commercial, construction, etc. . Contents either organic, inorganic plastic, metal, glass, etc. . Harmful potential either lethal, non-toxin, combustible, radioactive, communicable, etc. .
Residential solid waste: Residential solid waste includes organic biomass, paper, cardboard, leather, plastics, glass, yard wastes metals, ashes, bulky household items, etc. .
Industrial solid waste: It includes heavy and light manufacturing industries waste, construction site waste, fabrication plant wastes, power and chemical plant wastes, etc. .
Commercial solid waste: : It includes solid wastes such as plastics, edible wastes, paper, metals, wood, glass, special wastes and other lethal residues .
Institutional solid waste: Some of the common solid wastes include rubber waste, plastics, biomass wastes, glass, wood, electronics, cardboard materials, etc. .
Construction and demolition solid waste: Solid wastes such as steel, wood, concrete, plastics, copper wires, rubber, dirt, glass, etc. .
Municipal solid waste: : Such solid waste includes waste from street, recreational areas, beaches, treatment plants, landscaping, etc. .
Treatment plants solid waste: Solid waste including industrial wastes, unwanted metabolites products, plastics, metal residues, etc. .
Agriculture solid waste: Agricultural wastes, spoiled food, pesticide containers, come under this category .
Biomedical solid waste: These solid wastes include needles, dressings, gloves, drugs, packaging wastes, used sample containers, etc. .
Different methods of solid waste management which are as follows:
One of the most widely used method of solid waste disposal which involves spreading of waste in thin layers then compacted and enclosed with topsoil or plastic foam . In contemporary landfills, base of the landfill is surrounded with an water-resistant lining of thick plastic and sand granules to guard the ground water from being polluted due to percolation . When the landfill is occupied, it is then concealed sand, clay, gravel, etc. to avoid leakage of water .
Scorching of solid wastes in incinerators at elevated temperatures to convert it into ashes. It decreases the bulk of waste up to 20 or 30% of the original volume .
Recovery and recycling
It involves the processing and cleaning of discarded items. The process aimed at minimizing energy loss, utilization of new material and decrease of landfills [21,22].
Only applicable for biodegradable waste treatment .
Chemical decomposition of solid wastes into gases, solid residues
or liquid forms by heating under anaerobic conditions .
Effects of improper waste management
Improper waste management leads to increased amounts of solid
waste accumulation which in turn becomes a serious environment
problem . It will result in the decomposition of biodegradable
waste under improper and uncontrolled conditions producing
undesirable pungent odor and thus contributing a fraction to
air pollution . Besides, accumulation of such waste leads to
the growth of disease causing pathogens responsible for causing
numerous diseases in humans and animals . Aesthetic value
of the area is also spoiled . When waste is released in to the
environment it might affect or alter the productivity of soil, chemical
properties of ground water, etc. . During solid waste assembling,
the harmful wastes usually combined with usual compost and other
inflammable wastes making the discarding process even tougher and
dangerous . When wastes like insecticides, electronic batteries,
cleaning solvents, radio nuclides, plastics and other scraps are
scorched they yield dioxins and other harmful gases .
Appropriate solid waste management should be practiced by
human population globally to keep the surrounding environment
sanitary and free of contaminants.
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