Why an era where Grade 1 water in the four major rivers is a given is coming.jpg

Korea was the first in the world to install weirs between the river channels of the four major rivers,
and many scholars say that dismantling the weirs is the only way to improve water quality.
Originally, weirs are structures designed to purify water.
Since pollutants are filtered and settled by buoyancy, allowing only clean water to flow,
then why does installing weirs cause water quality to deteriorate?
That is because if it doesn't rain, oxygen cannot be supplied to the sediment layers.
As the water stagnates, pollutants settle at the bottom of the river,
at which point microorganisms begin to consume oxygen while decomposing and absorbing the pollutants.
When the dissolved oxygen at the bottom of the river is completely exhausted, microorganisms die off, the concentration of pollutants and organic matter rises,
and green algae blooms occur.
Water quality is determined by the dissolved oxygen rate at the lowest layer of the river, regardless of water depth.
Therefore, if oxygen supply devices are installed in the lowest sand layer of rivers with weirs or dam reservoirs,
microorganisms will absorb nutrients and decompose pollutants by absorbing the supplied oxygen.
If enough oxygen is supplied, the biological treatment capacity increases exponentially as microorganisms proliferate,
allowing the water's self-purification process to function 24 hours a day.
To achieve this, oxygen supply pipes must be buried at the bottom of the river, and there is a method for this.
Using the HDD method, oxygen supply pipes are installed near the bottom sand layer of the river at a depth of -1m to -5m.
It involves drilling and bringing in pipes from the outside for installation.
Holes are drilled in the oxygen supply pipes to ensure oxygen enters well between the sand layers.
By varying the pressure between 0.2 BAR and 2 BAR,
oxygen is supplied to the entire sand layer, and as organisms and microorganisms create water paths between the sand, the dissolved oxygen rate increases.
One unit is installed every 500m, and oxygen is supplied 24 hours a day by charging batteries with electricity generated from solar power facilities.
It is possible to create rivers where the sand is visible after all organic sediment in the four major rivers is decomposed.
Furthermore, the river channels between weirs can be used according to their intended purpose,
classifying each weir section into areas for intensive water purification, areas for drinking water, and areas for cultivating fishery resources.
The amount of dredging can also be determined according to the purpose.
In the case of Yeongju Dam, it can be made into Grade 1 water or Grade 2 water. It could be made into Grade 2 water to be used for raising fish.
By supplying oxygen, pollutants are removed by microorganisms, and nutrients or organic matter are recovered to reach purification levels.
To do this, facilities must be installed to pump water from the river bottom, filter it, and reintroduce it into the river.
By installing automatic filtration facilities powered by solar energy,
nutrients in the river can be slowly recovered and turned into fertilizer.
To make all the rivers in South Korea Grade 1 water, starting with Yeongju Dam, the dissolved oxygen rate at the lowest layer must be maintained at a high level.
With the birth of the GBMB (Gravity-Buoyancy-Microbial-Biofiltration Water Purification System) method,
weirs are no longer structures that deteriorate water quality, but rather purification facilities that prevent water quality degradation and maintain Grade 1 water by filtering water through buoyancy and decomposing pollutants via microorganisms through oxygen supply.
Oxygen supply facilities should be mandated at the lowest layer of rivers, dams, lakes, and reservoirs where water collects at a constant rate.
A control tower for each river would measure the dissolved oxygen rate and inject necessary microorganisms according to the river's pollution status to purify the water.
Nature can be utilized to maintain and manage water quality at Grade 1 with minimal cost.
This is a method of purifying water without consuming it.
We will become a country with a new water management system and an innovative water quality management system that exists in no other country in the world.
In the Seomjin River, where seawater rises, we can fill it with freshwater by installing an estuary dam and create Grade 1 water by installing oxygen supply facilities at the bottom.
There is still a lot of organic sediment at the bottom of the estuary dams of the four major rivers, but if only oxygen supply facilities are installed, it can all be turned into Grade 1 water.