Water Pollution ; Water details part-4
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Water Pollution means water is polluted by many reason, 1. Natural , 2. For Man
The cause of water source pollution in Bangladesh
Almost all water sources in the world, including Bangladesh, especially surface water, are constantly being polluted in various ways. This time we will discuss the causes of that pollution. Do you know where the waste water goes after using it for bathing, toilet waste or other purposes?
A large portion of the wastewater is discharged into the rivers through sewer pipes and these contaminate the water severely. This wastewater contains a variety of chemicals, ranging from pathogens to contaminants, which contaminate the water. What do we do with the solid waste that is made in our homes?
Usually we throw it in the dustbin next to the house or in an open place like a lot of time. These wastes start decomposing in 1-2 days. When it rains, the decomposing waste contains a variety of chemicals, including pathogens, mixed with rainwater to contaminate rivers, canals or lakes. As you all know, agriculture requires the use of chemical fertilizers, organic fertilizers and pesticides to increase soil fertility.
Can water be contaminated from these? Yes, of course chemical and organic fertilizers and pesticides used on agricultural land can contaminate rain or flood water if it rains or floods. Can water be polluted from industry? Yes, it can. One of the biggest causes of river water pollution is industrial waste.
Have you ever been to the river Buriganga? If you go, you will see the stench in its water and its color is very black. The reason for this is that on the banks of the river Buriganga, at one time, one of the export products of Bangladesh, leather making factory was established. The water of this leather factory is being polluted as a result of a lot of waste falling into the river Buriganga.
Newspapers and television often report on the pollution of the Buriganga River. Most of the river water of Bangladesh like Buriganga is being polluted by the wastes of various industries like textile mills, dyeing, dye making factories, fertilizer factories, paper making factories etc. Rivers and seawater are also polluted by excrement and oil products from boats, launch steamers or ships. Soil erosion, dust or other substances mixed with water also contaminate the water through river erosion, storms.
Abandoned water from the laboratory where there are various chemicals including acids, alkalis, also contaminate the water. We all know about the ground water pollution caused by chemicals like arsenic.
Water pollution on plants, animals and humans Effect
Contamination of rivers, ponds, canals, and underground sources can have a detrimental effect on plants, animals, and humans, and can sometimes even take a deadly toll. Let’s take a look at all these harmful aspects of water pollution.
Did you know that typhoid, cholera, dysentery, contagious hepatitis B are all waterborne diseases? Yes, many of these life-threatening diseases are transmitted through water, and even these diseases can take the form of epidemics if left unchecked.
The germs of these diseases enter the water in various ways, especially with excrement, rotten things. Bathing in that water, drinking that water or cooking food with that water or washing it or coming in contact with that contaminated water in any other way can infect human or other animals.
Not only that, there are some organic substances like dung, plant debris, food waste which react with dissolved oxygen in water during digestion. You tell me what can happen as a result ?
Understandably, this reduces the amount of dissolved oxygen in the water. If there are too many of those substances, the amount of dissolved oxygen in the water can drop to zero.
Then all the animals living in the water including fish will die due to lack of oxygen. If this situation continues for a long time, at some point all those rivers, canals and beels will become lifeless.
There is a lake called Erie in the state of North Ohio in the United States, which was declared a dead lake in the 1970s. This is because the dumping of waste from several detergent factories around the lake into the lake increased the phosphate levels there.
When phosphate and nitrogen are added to the water, it helps to grow a lot of algae. When these algae die, they react with the dissolved oxygen in the water. This results in a lack of oxygen in the water. As a result, all animals, including fish, died and at one point Erie became a “dead” lake. Following this incident, the US government passed a law prohibiting the discharge of industrial wastewater into the lake without purification.
Detergent factories have since started discharging wastewater into the lake after phosphorus depletion, and surprisingly, after about ten years, the existence of animals on Lake Erie has begun to catch up again. Is there any fish in our river Buriganga now? No, not available. That means its condition is a lot like Lake Erie.
Not only the Buriganga river, but many rivers in our country are getting polluted due to industrial effluents, which could lead to their condition becoming like Lake Erie. If we don’t warn them now, it could lead to a catastrophe. Hopefully, work has started with various plans to decontaminate the water of Buriganga and other rivers.
When algae die, along with dirt, on the one hand, such as oxygen deficiency,
On the other hand, there is a strong stench in the water. This disrupts all kinds of recreational activities including swimming, fishing and boating. You already know that inorganic substances (such as acids, alkalis, salts) are harmful to aquatic plants and animals.
If the water contains harmful metals (such as mercury, lead, arsenic, etc.), then drinking that water can cause various diseases in the human body. Harmful to mercury, lead and arsenic
The effect is as follows:
Brain disability, skin cancer, disability.
Disgust or irritable mood, burning sensation in the body, anemia, kidney failure, brain damage if the amount is too much.
Arsenicosis, skin and lung cancer, diseases of the stomach.
Although water is contaminated with inorganic fertilizers (nitrate and phosphate) used in agricultural lands, serious problems arise. Water contamination by radioactive substances such as uranium, thorium, cesium, radon, etc., is a threat to aquatic plants and animals on the one hand, and deadly to humans on the other.
Radioactive substances cause a variety of cancers and respiratory diseases in the body. Can you tell me how radioactive substances can get into the water? A vivid proof of this is the (11 March 2011) radioactive accident in Fukushima, Japan. The accident caused a tsunami to spread large amounts of radioactive material around the nuclear power plant. It has a lot of radioactivity in food starting from water.
In addition, if there is insoluble substance in the water, the water becomes cloudy. You already know what kind of problem this causes.