Date. 1st July 2024
The interactions between humans and our environment. Pollution is defined as processof the environment of substances liable to cause harm to humans and other living organisms. Many human activities pollute our environment, adversely affecting the water we drink, the air we breathe, and the soil in which we grow food.
Hereare the different types and sources of pollution and the various human activities that can cause pollution. Hereis a description of the ways pollution can affect different sectors of the environment, water, air and soil. Some of the significant effects of pollution on the environment and on human health, also options for preventing and controlling pollution.
If you hold up a glass of water in front of you, how can you tell if it’s polluted? You would expect drinking water to be colourless, odorless and transparent not turbid with suspended particulates. If it was not all of these things, then it could be polluted. If you were looking at water in a river, it is unlikely to be as clear as drinking water in a glass, but you could deduce it was probably not polluted if you observed that the water did not look dirty or smell bad. You might also observe that animals were drinking the water without ill effects and fish were swimming in it. However, if the water was discoloured or had an unpleasant odour, or you could see dead fish floating on the surface you could conclude that pollution was the problem.
Let us consider the human activity that could have caused the pollution. Imagine a river that flows through an area of land on the edges of a town. The water is used by the community for drinking and other domestic uses and also for vegetable farming. Several residents use this water to irrigate small areas of land where they cultivate vegetables and many of the farmers use fertiliser and pesticide to improve productivity. Fertilisers are made of chemicals such as nitrogen, potassium and phosphorus, which are essential plant nutrients. Pesticides are chemicals that destroy pests but can be harmful to other forms of life including humans.
Imagine that one farmer has finished spreading the chemicals on his crop and decides to wash the empty pesticide sack he has been using in the river. Later that day, it rains heavily and rainwater is seen running off the field into the river. What do you think happens? The river is receiving run-off containing fertiliser and pesticide chemicals that had been applied to the crops, which is made worse by the farmer washing his sack that had contained the pesticide. This could harm fish and other organisms living in the water possibly killing them. The river is also used by the community so the chemicals could get into drinking water that is consumed by humans. The river has been polluted by the careless action of the farmer washing his sack and by the action of rainwater washing the chemicals into the river.
Pollution always has a source and a recipient. The source is where the pollution comes from, that is, where the pollution is released into the environment. The recipient is where the pollution ends up, which may be a part of the environment or people or animals that become contaminated or damaged.
There are a number of ways of identifying pollution. These include finding symptoms of damage to aquatic plants and animals such as dead fish, finding chemicals in the water, comparing the previous history of the quality of water with the present quality, and getting complaints from water users. Even when a problem has been found, investigations to identify the source may take time. For example, water samples from several different points upstream and downstream will need to be analysed to locate precisely where the problem originated.
There are several different ways of classifying pollutants. They can be categorised by their physical nature, by their source, by the recipient or by the sector of the environment affected. In the following sections we will look at each of these classification groups.
Pollutants may be in the form of gas, liquid, solid or energy.
What polluting gases can you think of?Liquid pollutants usually come from liquid waste. Liquid waste includes human excreta, both faeces and urine, industrial wastewaters and other forms of waste from waterusing activities. Factories generate liquid waste from activities related to washing in the manufacturing process, cleaning objects and chemical mixing. Sewage is a mixture of human excreta from waterflushed toilets and other wastewater from houses and businesses. Sewage and human waste from overflowing septic tanks and latrines are frequent sources of pollution.
Car washing produces contaminated water containing engine oil and fuel, which may flow into rivers and lakes. Urban run-off is another type of liquid waste that can cause pollution. Rainwater washes many different types of waste from building land surface into drains, trenches lakes and rivers. Urban run-off can contain a lot of organic matter. This may come from open defecation or inappropriate handling of organic wastes produced from households and businesses. Organic matter includes anything that is derived from living organisms, such as human and animal wastes, decaying plants and food wastes.
Pollutants also come in solid form. Plastic bags are one of the most common solid wastes. Solid waste is any solid material that is assumed not to be useful and is therefore thrown away. Factories, businesses and households produce different kinds of solid waste such as paper, plastics, metals, chemicals in solid form, pieces of cloth or food and animal remains. Sometimes you may have observed faecal matter discarded with solid waste, which adds to the problems.
There is a fourth type of pollution that is common in urban communities. This is energy in the form of noise pollution. Noise pollution means unacceptable levels of noise in work, residential and recreational places. Noise makes it difficult to have a conversation and also irritates and disturbs us and in the long term can damage our hearing. Loud music from music shops and clubs in an urban community is a known source of noise disturbance. Such noise may please some, but it disturbs many other people because it interferes with communication in the daytime and sleeping at night.
Another way of classifying pollution is by the sector of human activity that produces it. Before we look at the various sectors, there is an important distinction to be made about pollution sources. Sources of pollution can be categorised as point or non-point sources. Point sources are identifiable points or places that you can easily locate. An example is a diesel truck that produces visible black exhaust fumes from its tailpipe. Liquid waste released from a pipe into a river is another example. A non-point source also known as ‘diffuse pollution’ is one where it is difficult to identify the exact origin of the pollution. A good example is floodwater that washes all types of waste from the land, possibly including faecal matter into a river. In this situation you cannot identify the individual or household or establishment that has caused the water pollution.
Non-point source.Solid waste and faecal matter are distributed all along the banks of the river so no single source can be identified.
These sources of pollution include toilets, latrines and wastewater from kitchens and bathrooms. If these wastes are properly contained and prevented from getting into the environment, they will not cause pollution. However, frequently this is not the case. Open defecation obviously releases human waste into the environment, which can then be washed into rivers and other surface waters.
Solid wastes from households and also from shops, markets and businesses include food waste, packaging materials and other forms of rubbish. Domestic sources are also responsible for gaseous pollutants in the form of smoke and carbon dioxide from domestic fires.
Pollution from the industrial sector in some counties has been on the rise, posing a serious problem to the environment. Many industrial processes produce polluting waste substances that are discharged to the environment, frequently through chimneys to the air or through pipes to surface water. Among the most polluting industries are food processing, tanneries and textiles with processing plants and factories that produce liquid effluents which are discharged into rivers, often without treatment. In practice, rivers frequently receive polluting discharges from many different sources all at the same time. The Little Akaki River in Addis Ababa, for example, is polluted by several different industrial sources as well as by domestic wastes.
The agricultural activities are also increasing and changing too. Nowadays, agricultural activities in Ethiopia use more pesticides and fertilisers. Ethiopia imports over 3000 tons of various types of pesticides annually. Federal Environment Protection Authority, 2004. Fertiliser use in Ethiopia has increased from 140,000 metric tons in the early 1990s to around 650,000 metric tons in 2012. Fertiliser contains phosphate and nitrate and if these reach water bodies, they can cause excessive plant growth.
Agriculture is also responsible for gaseous pollutants in the form of methane produced by livestock and solid pollutants from crop residues, packaging materials and other wastes similar to those produced domestically. Animals also contribute to waste products and potential pollutants with their excrement.
Do you live in a city or have you visited citiesin different countries,If so, you will no doubt be familiar with the variety of vehicles on the roads. Some are small cars; others are heavy motor trucks. These vehicles differ not only in their size, but also by using different types of fuel such as petrol, diesel, and blended fuel, 10% ethanol and petrol. If you observe the tailpipe of diesel engine vehicles, you will have seen the black exhaust gas produced. The intensity of the black colour is greater for poorly maintained vehicles, to the extent sometimes that it makes the air hazy or smoky and causes coughs and eye irritation. The lack of a policy to remove old vehicles from the roads adds to the problem and make it worse.
This can affect surface water such as rivers and lakes, soil moisture and groundwater in aquifers, and the oceans. The actions of the water cycle connect all these different reservoirs of water. For example, a polluted river will discharge into the ocean and could damage the marine environment. However, the volume of water in the ocean can disperse and dilute the pollutant so that its worst effects are only felt near the mouth of the river.
Water pollution is characterised by the presence of excess physical, chemical or biological substances that change the qualities of the water and are capable of causing harm to living organisms. We mentioned earlier that natural or unpolluted water is colourless, odourless and transparent. Water that tastes or smells bad or is cloudy can be said to have the symptoms of water pollution. However, some water pollutants cannot be seen or tasted, for example some chemicals, such as pesticides, and most of the micro-organisms that cause waterborne diseases. So, water pollution involves more than just the appearance of the water. Polluted water should not be used for drinking, washing, bathing or agriculture. If polluted water is used by humans, then it can adversely affect the body in different ways, depending on the type and concentration of pollutant.
Most rivers and streams in some countriescontain significant quantities of suspended solids that are carried along in the flow and make the water look brown in colour, especially in the rainy season. Most of the solids are fine particles of soil and leaves that have been washed into the river from surrounding land by rain, often following cultivation or construction work. Large quantities of solids in the water can reduce light penetration into the water which can affect the growth of plants.
It can exist at all scales, from local to global, and can include gases and solid particles. It can affect you in your own home, or in your town or city, and can contribute to global atmospheric changes. The most common sources of air pollution in the urban parts of the country, include the burning of wood, charcoal and other biomass fuel by households, small businesses such as bakeries, manufacturing industries, and vehicles.
Air pollution is defined as the presence in the air of abnormal amounts of chemical constituents capable of causing harm to living organisms. Clean air consists of nitrogen, 78% by volume, oxygen 21% and trace gases 1%. Polluted air may contain particulate matter, such as black soot and many different gaseous chemicals such as carbon monoxide, carbon dioxide, nitrogen oxides, sulphur oxides, ozone, nitrates, sulphates, organic hydrocarbons and many others. Many of these are also found in clean air as trace gases but they become pollutants if present in abnormal quantities.
The emission of black smoke is an indication of intense pollution. However, not all air pollution is visible or can be smelled. Gases such as carbon monoxide and carbon dioxide are invisible and odourless. Carbon monoxide is very dangerous to humans. It can be produced by inefficient burning of fuel, for example a charcoal stove in a home with inadequate air supply and if breathed in large quantities it can be deadly. Carbon dioxide is an important pollutant that is involved in climate change.
Soil pollution, also called land pollution, is linked to water pollution. Liquid wastes containing toxic chemicals or pathogenic micro-organisms on the surface of the land can seep slowly into the soil and may percolate down to contaminate groundwater, which can affect people using springs or wells in the area. Possible sources include open defecation, pit latrines or leaking storage containers for industrial chemicals and wastes.
Solid waste can cause soil pollution. A collection of solid wastes in one place or scattered around is unsightly and might smell bad to you as you pass by. Household waste typically consists mostly of food waste that will gradually decompose. This produces a bad odour and attracts insects and rats, both of which contribute to the transmission of disease. As the waste decomposes it produces a liquid called leachate which trickles down into the soil. Leachate is a highly concentrated liquid pollutant that may contain toxic chemicals and pathogenic micro-organisms as well as high levels of organic compounds. Rainwater falling on, and washing through, solid waste adds to the problem.
Urban solid waste contains a mixture of many different types of waste and can pollute soil and water if it is not contained and managed correctly.
Environmental pollution is the result of human activity and development that occurs when physical, biological and chemical agents are released to the environment in such quantities that the pollution adversely affects human health and damages the environment.
Pollution can be classified by its physical nature, by its source, by its recipient, by the sector affected or by its effects.
Pollution may be in the form of a gas, liquid, solid or energy.
Sources of pollution may be pointing sources, which are easily identified, or non-point sources, where the pollution comes from diffuse sources that are not easy to pinpoint.
There are different types of pollution, water pollution, air pollution, solid waste pollution and noise pollution. All of these can be found in urban areas.
The main sources of pollution are household activities, factories, agriculture and transport.
Once they have been released into the environment, the concentration of some pollutants is reduced by dispersion, dilution, deposition or degradation.
Water can be contaminated by physical pollutants, solid material, biological pollutants, such as bacteria that cause waterborne diseases and many different chemical pollutants.
Air pollution can be caused by gases or solid particulates.
Soil pollution is linked to groundwater pollution. Solid waste can produce highly polluting leachate which contaminates soil groundwater.
It cost time and money to be regulated. There are expenses related to permitting and compliance, including permitting fees, required emission control technologies, emission rate fees, staff time related to permit applications, recordkeeping, and reporting requirements; and potential fines for noncompliance. If the wastes a business aims to reduce or eliminate through regulated state laws or federal laws and the reductions are significant enough, costly permits and government approvals can potentially be avoided. At the very least efforts can minimize regulatory compliance issues and the liability costs associated with regulated waste management including permitted emissions. The adoption of procedures, work instructions, and additional training will add consistency and stability to environmental programs, lead to improved control of potential environmental impacts, and help a business anticipate and control upsets. Pollution prevention also provides an opportunity to act cautiously with imperfect information, scientific uncertainty, and high risk. As science progresses, the stringency of environmental regulations continues to increase for contaminant discharges into all environmental media. Efficientprojection can position a company to meet or surpass projected future usage and discharge limits resulting from unknown factors such as purchase prices, disposal costs, or new health issues that accompany the use of substances known to be environmentally damaging.
Every business generates waste that is costly to manage at any stage in the process. This associated with the following areas are escalating.
Handling both in-house and external custodial and collection services. Storage vessel cost, maintenance, labeling, and secondary containment for safety and spill prevention
Transport waste loading or unloading and hauling
Treatment control equipment to meet regulatory requirements
Disposal of excess or spent materials
Burying waste in management costs into general overhead can lead to the illusion that disposal is free. The expenses are significant whether the waste is recycled, landfilled, or it is hazardous waste that requires special transport, treatment, and disposal practices. Furthermore, some businesses are currently complying with regulatory restrictions by treating total plant effluents, which can be complex mixtures of process waste materials that involve large volumes of dilute wastes. These aggregated waste streams often require a great deal of attention because it is difficult to effectively destroy or to remove a high percentage of all regulated contaminants. The potential for cost reductions associated with reduced waste generation is substantial. Managing something as simple as food waste through composting, for instance, is currently at least 10 times more costly than preventing food waste in the first place. By moving back up the pipe to identify and segregate waste streams through implementation, businesses can reduce or avoid expensive treatments, equipment and maintenance expenses, the number of overall waste pickupsand all other associated storage and disposal costs.
The financial liability from using and disposing of hazardous substances is potentially unlimited, and can be associated with civil actions, tort suits, real property damage, fines, and many other costs related to accidental releases or exposures during handling, storage, transportation, and disposal processes. By reducing the use and disposal of toxic or hazardous wastes through some facilities have been given lower liability insurance rates and lower loan rates. These lower rates are the result of reduced legal liability concerns, decreased likelihood of catastrophic occurrences, and reduced exposure risk to workers, communities, and the environment.
Gone are the days when resources were inexpensive and energy costs were low. As the demand for resources increases and supplies remain limited, operating costs for businessesand non-profit organizations rise. Conservation is one of the most lucrative investments an organization can make. By reduce raw material and resource use, e.g., energy and water, a company can experience immediate and long-term savings. Even when utilizing renewable resources e.g., solar or wind power, a company should strive for efficiency through conservation, as prevention is less costly than renewables. Additionally, by improving inventory control through good practices, businesses can avoid material costs related to overbuying, spoilage or expiration, and necessary storage or transfer. Further, material reuse and interchangeability can be optimized through efforts, which can result in significant savings through reduced purchasing cost.
A company can gain a competitive advantage and revenues by implementing efficient process or operational improvements. Efforts result in efficient use of resources, optimized production methods or processes, and reduced waste generation. Some businesses have been able to expand production without additional regulation because of material substitutions, in-process recycling, or better material application methods. Many efforts have resulted in reduced downtime, reduced rework or operational losses, and improved productivity. Often, these changes lead to increased sales and company profits.
It is common for efforts to result in market development for businesses. Sometimes, previously untapped markets are opened for a company as a result of new or modified product development from process changes. Businesses may experience increased revenue through new sales, uses of byproducts, recovered products through material exchanges, sales of recyclables, by reaching new consumers that value green production. If market shares that were previously lost can be regained and those left unexplored can become a viable source of new sales.
EMBA PGDCM PGDE PGCPM PDBS MQSi SACD
Building Scientist - Construction Economist
Quantity Surveyor - Valuer/ Appraiser
Construction & Project Management
Environmental Science & Natural Resource Management
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Email: Jewelccameron55@yahoo.com