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Q & A

Question 1:
What is the quantity of WK that needed to purify a polluted river?

Answer 1:
As for the input of WK, 8ppm are basic for an inflow of the water.

ppm (parts per million) is "a one-1000000th". In the case of water pollution, consider mg/kg and mg/l to be same, and there is a thing expressing it in mg/ppm. 1ppm says the state that a material (a solute) of 1mg comes dilute in water of 1 l (a liter).

For example, the consumption of WK is as follows in the case of a river with the inflow of 3,000,000t .

Because the consumption of 300*0.008=24,000l (a liter) WK is 8ppm, it becomes the calculation of 24,000 liters. But some consumption of WK changes by pollution degree of the inflow water, too.

Question 2:
Why is it that BOD and COD turn worse temporarily during decomposition process by the purification?

Answer 2:
At first the BOD (biochemical oxygen demand) is a quantity of oxygen used by underwater aerobic microbe-related increase and breathing action. It expresses pollution degree, the contamination degree by the organic matter in particular of the water.

It is a quantity of oxygen that is used when the COD (a chemical quantity of oxygen) uses an oxidizer in substitution for a microbe and dismantles underwater organic matter.

So that it is that the sludge decomposition is opening, to become active, and the water becomes active temporarily that BOD and data of the COD turn worse, and, after addition of WK, the water becomes an aversion state. An aversion state is a state without the oxygen. The aversion state of this temporary water is the process that is important when water purifies it with a thing showing the state that the decomposition of the sludge becomes intense by a microbe.

As for the BOD and the aggravation of the COD, the water itself becomes beautiful toward the purification with a thing only for numerical value.

Question 3:
Can an effect of WK go through whole river?

Answer 3:
By the state of the river, there are two ways:

- In the case of the flows from the upper reaches to the down stream
A dripping of WK place is the upper reaches, but purification begins with the river mouth side of the down stream. Because this is that stream flow conflicts to seawater at the river mouth, and stay time of WK gets longer, and effective time is given the activation of the microbe. The effect emerges from the down stream even if dripping WK at upstream.

- In the case of a river with the high and low tide difference
The effect of WK goes to the whole river in it rises by turns for six hours, and there being a pull when use a high and low tide difference and lasts.

Question 4:
Why the “Bulking phenomenon” doest not happen when used WK at a sewage water treatment plant ?

Answer 4:
- "The Bulking phenomenon" does not happen in WK
The Bulking phenomenon is the water that the purification of the filthy water is not performed enough, and even the corpse of the microbe and the microbe which lived are phenomena filamentous funguses spread, and to get up when the microbe group which is not suitable for water purification (it is with a useful microbe, potato) increases.

MLSS (microbe density) increases to three or four times when use WK. The evidence that the increase of the microbe which microbe activation is performed by an effect of WK as for this, and lived is performed. It is a well-known fact to lead to the decomposition of the excess sludge when MLSS goes up

- The reason why "Bulking phenomenon" does not happen when use WK
WK performs the food chain that continues letting bacteria and a microbe live and creates the environment where a microbe can live in filthy water in the sewerage treatment institution. Because WK allows "water purification" and the decomposition of the organic compound perform at the same time, "Bulking phenomenon" does not happen even if MLSS multiplies.

WK completely prevent "Bulking phenomenon", and technology of WK which can perform the complete decomposition of the sludge persistently and to increase MLSS safely.