Effects of Dumping Sewage Water Directly Into the Sea,

                                                                                                                    By Ekta rana update 30/09/2017 

Effects of Water Pollution:
      When toxic substances enter a body of water, they will be dissolved, become suspended in water or get deposited on the bed of the water body. The resulting water pollution causes the quality of the water to deteriorate and affects aquatic ecosystems. Pollutants can also seep downand effect groundwater deposits. Saida's sewage and industrial wastes are discharged into the rivers. Because of this, pollutants enter groundwater, rivers, and other water bodies. Such water, which ultimately ends up in our households, is often highly contaminated and can carry                                                                                                                        disease-causing microbes.
WHAT Is   DOMESTIC SEWAGE?

· Sewage originating primarily from kitchen,bathroom, and laundry sources.· Waste from food preparation, dishwashing, garbage-grinding, toilets, baths, showers, and sinks.

WHY IS DOMESTIC SEWAGE A PROBLEM?
     Domestic sewage contains a wide variety of dissolved and suspended impurities. It amounts to a very small fraction of the sewage by weight, but it is large by volume and contains impurities such as organic materials and plant nutrients that tend to rot. The main organic materials are food and vegetable wastes. Plant nutrients come from chemical soaps, washing powders, etc. Domestic sewage is also very likely to contain disease-causing microbes. The various substances that we use for keeping our houses clean add to water pollution because they contain harmful chemicals. Most detergents and washing powders contain phosphates which are used to soften the water, among other things. These and other chemicals contained in washing powders affect the health of all forms of life in the water.
      When sewage enters a lake or stream, microorganisms begin to decompose the organic materials. Oxygen is consumed as micro-organisms use it in their metabolism.
        
Ecological Damage:
     Sewage-contaminated water causes eutrophication, which is the increase in concentration of chemical elements required for life. The nitrates, phosphates, and organic matter found in human waste serves as a food for algae and bacteria. This causes these organisms to overpopulate to the point where they use up most of the dissolved oxygen that is naturally found in water, making it difficult for other organisms in this aquatic environment to live. The bacteria are basically strangling the other organisms. Some of the organisms that do overpopulate from this can also be disease-causing microorganisms. Phosphates are also found in soaps and detergents, but there are other household products that we use everyday that can be toxic to many animals and humans if they are dumped directly into a water body.
Health Risks:
     Bathers are at increased risk of contracting illness due to bacteria and viruses present in sewage effluent. Gastrointestinal disorders have been linked to sewage pollution, with viruses implicated as the cause.
     Shellfish strain water through their gills to trap microscopic plants and animals for food. If the water was contaminated with disease-causing bacteria, these could be consumed as food by shellfish. When eaten raw or partially cooked, these shellfish can make people sick. Certain fish in contaminated waters can accumulate high levels of toxic substances.  When these foods are consumed frequently over a lifetime, they may increase the consumers’ risk of adverse health effects. Detergents can cause liver and kidney damage, while sewage water carries diseases such as Giardiasis, Amoebic dysentery and Cholera.
Economic Loss:
      Debris associated with sewage probably has the highest monetary cost associated with its presence on our beaches due to the resulting loss of tourism in addition to blockage removal. The closing of commercial shellfish beds due to sewage contamination can lead to high income loss.
     Clean beaches have many advantages for humans and commercial seafood farms as well as for the wildlife:
           
  • They are safer for the public.
  • They encourages people to come and use them, which will improve local economy.
  • They benefits everyone now and in the future.

    These reasons prove the necessity for a solution.
WHAT IS THE SOLUTION?
     It used to be said that  “the solution to pollution is dilution.” When small amounts of sewage are discharged into a flowing body of water, a natural process of stream self-purification occurs.  However, densely populated communities generate such large quantities of sewage that dilution alone does not prevent pollution.  Instead of discharging sewage directly into a nearby body of water, it’s better to let it pass through a combination of physical, biological, and chemical processes that remove some or most of the pollutants. This takes place in sewage treatment plants.
Treatment Plant:
     Sewage treatment plants neutralize and deactivate the chemicals found in the sewage water. They work by relying on the bacteria that is found in our colons, which eat away the nitrates, phosphates and organic matter that is found in sewage. These plants can be expensive to build and operate for many governments, but there are cheaper alternative which rely on nature to do most of the work. This is done by rebuilding or restoring wetlands,  because the plants and bacteria found in the wetlands will do the same thing that bacteria in standard sewage treatment plants do. This helps the environment in two ways: restoring wetlands and treating human waste water before it pollutes the natural waterways.
WHAT CAN CHILDREN DO?
     In many countries, there is an ongoing national campaign called ‘Bag it and bin it, don’t flush it!’ It’s aim is to protect rivers and seas by decreasing the number of disposable items flushed down toilets. So, bag it and bin it. Please don’t flush it.
     Don’t flush anything down the toilet that is made of plastic or non-biodegradable material. This includes cotton bud sticks, sanitary towels and nappkins which can travel through the sewers and end up back on our beaches.


RESOURCES
- Biology and Geo Science Dept. Stuyvesant High School.
- Britannica

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