::: Negatron Co., Ltd :::

HOME > Product Profile > Nano Division > NANO FRESH - NB TYPE

■ Micro and Nano bubble generating video

■ Micro bubble & Nano bubble Generating System

■ Nano-Fresh Unit

■ Technology Tree

■ Mechanism

① circulating water sucked in with air flows into a NANO-FRESH unit mixed with other water
② flow velocity increased while the water passed through a narrowed tube and subjected to both centrifugal
③ By hitting against dual ball pin, the water forms turbulent flow, instantly generating 0.1~10㎛ sized ultra-fine air

Features
- Miniaturization of equipment : improves the Dissolved Oxygen (DO) level by producing relatively a great quantity
- Maximization of Oxygen Transfer Efficiency : accomplishes over 90% of SOTE (Standard Oxygen Transfer Efficiency
- Diffusing and reflecting effect : increases the efficiency of UV-ray energy utilization by distributing UV radiation
- Bubbling Effect : Biological Activity, Physical Chopping effect, coacervation effect

■ Product effectiveness

Health
1. Bathhouse and fomentation room : 100% of water recycling, fuel cost reduction
2. Swimming pool : creates a pleasant swimming pool environment by enabling drastic reduction of chlorine
and flocculant use
3. Utilization as a medical device : effective on rheumatis and atopy

Food
1. Raw water for Soju and beer : improves the taste of liquor and prevents decomposition
2. Salt production factory : improves the taste and purity
3. Marine product processing factory : improves the taste and freshness

Nature
1. Green algae removal and water quality management for lakes and golf course : water reduction and restoration
water quality improvement
2. Removal of scale within pipes : energy-saving effect
3. Dye industries : improves the solubility of dyes maintains even permeability of dye

Farming
1. Cultivation farm and nursery : maximizes oxygen density; provides highly-concentrated fodder
2. Fruit cultivation : increases yields and promotes growth
3. Livestock breeding: improves the environment around cattle shed :; promotes growth

■ Underwater Oxygen transfer efficiency of NANO-FRESH ultra-fine air bubbles

	Diameter(㎜)	Area(㎟)	Volume(㎣)	Contacting area per unit size
Ceramic Fine Bubble	2 ∼ 3	50 ∼ 113	34 ∼ 113	1.5 ∼ 1
Medium Bubble	3 ∼ 4	113 ∼ 201	113 ∼ 268	1 ∼ 0.75
Coarse Bubble	10	1,256	4,187	0.3
NANO FRESH	0.1~10㎛	0.0314 ∼ 8.04	5.2×10 -4~2.14	60.4 ∼ 3.8

■ Size of air bubbles and underwater oxygen transfer efficiency

Vapor transfer
In order to transfer necessary amount of oxygen into water, a vapor-liquid interface is required. In other words,
generating more interfaces between air and water by injecting or blowing in air bubbles into water enables the transfer
of gas into liquid.

Vapor transfer coefficient
Vapor transfer velocity is in proportion to the contact area of gas-liquid interface and shortage of vapor saturation within
liquid. This is formulated in the following expression.

эM/эt = -D.A.эC/эXf
эM/эt = Velocity of vapor transfer Kg O2/h
D = Diffusion coefficient of gas ㎡/h
A = contact area of gas-liquid interface ㎡
эC/эXf = oxygen concentration gradient Kg/㎥/m

Therefore, if the diffusion coefficient and the gradient of oxygen concentration are assumed to be equal, velocity of vapor
transfer in general increases as the size of vapor at the gas-liquid interface becomes smaller and in turn as the gas
contact surface becomes larger.

- Area of gas-liquid contact, vapor size and contact duration
area of gas-liquid contact is determined by the size of vapor.
That is, area of gas-liquid contact is inversely proportional to the size of vapor.

- Area of contact upon the size of vapor
1mm : 100㎛ = 1:10
1mm : 10㎛ = 1:100
1mm : 1㎛ = 1:1000
1mm : 0.1㎛ = 1:10000

- The size of vapor and vapor ascending speed
y = 0.0001X² (Actually 2.2195)
vapor ascending speed y = ascending speed mm/sec
contact duration X = diameters of fine vapors(㎛)

■ Between ordinary oxidization pipe vapor and NANO-FRESH vapor

Ordinary oxidization pipe vapor : 2mm=2000㎛
NANO-FRESH vapor : 0.1-10㎛
1. Area of contact : 20 to 2000-fold
2. Duration of contact : results in over 80~8000 times effectiveness

General data on oxygen transfer capacity of the various aeration devices	Vapor size	Transfer efficiency % (SOTE)	Note	Transfer velocity (kg/O2/kW.h)
	Vapor size	Transfer efficiency % (SOTE)	Note	Standard	Comparison	Real
Typical Diffused-air Systems	2-3 mm	10-30	1-3	1.2-2.0	1-1.7	0.7-1.4
Ceramic Fine Bubble	3-4 mm	6-15	6-1.5	1.0-1.6	8-1.3	0.6-1.0
Medium Bubble	10 mm	4-8	4-.8	0.6-1.2	5-1	0.3-0.9
Coarse Bubble	0.5-0.8mm	61	6.1	6.5	5.4	5.2
Turbine-sparger system				1.2-1.4	1-1.2	0.7-1.0
Static Tube System	7-10		1.2-1.6	1-1.3	0.7-0.9
Jet		10-25		1.2-2.4	1.2	0.7-1.4
Pure Oxygen Systems
Mechanical surface aeration with Cryogenic generation						1.4-1.8
Mechanical surface aeration with Pressure-swing generation						1.0-1.3
Turbine Sparger with cryogenic						1.2-1.5
NANO FRESH	0.1-10㎛	95		3.17	2.6	2.54
Low-speed surface				1.2-2.4	1.2	0.7-1.3
Low-speed surface with draft tube				1.2-2.4	1.2	0.7-1.4
High-speed floating aerator				1.2-2.4	1.2	0.7-1.3
Rotor-brush aerator				1.2-2.4	1.2	0.7-1.3

메인메뉴