New Medium of Bio-filtration for Aquaculture

New Medium of Bio-filtration for Aquaculture
The newest Bio-filter Medium
suitable for 21st Century
We Nihon Kensetsu Gijutsu Co., Ltd. have been doing research and development on
water purification media and have begun large-scale sales of the product, Crystal Bio.
This new product is made from a glass substance in Nihon Kensetsu Gijutsu Co., Ltd. It
has an extraordinary porous structure of light-weight ceramic, which is obtained by
burning the mixture of glass substance particles and foaming agent at high temperature
of 900 °C.
We have jointly studied bio-filter for aquaculture with the Kyushu Laboratory of
Aquatic Biology. We have conducted repeated examinations of the effect on water puri­
fication in the laboratory and on Ogata Koi Farm Co., Ltd. in Fukuoka, Japan. We have
gained excellent results of biological water purification for this product.
*An actual pond using Crystal Bio in Ogata Koi Farm
(50 m3 of Crystal Bio in 400 tons of water)
(The circulation of water: 10~12 times/ day)
Excellent nitrification
Easy maintenance
Crystal Bio has an extraordinary
Crystal Bio is made up of small
large amount of surface area be­
particles with a 10 to 50 mm in
cause of its porous structure,
diameter. This small, light weight
which enables propagation of
medium can fit into any filtering
aerobic bacteria in it.
tank and would save a lot of
Crystal Bio itself is a little alka­
trouble, filling and cleaning.
line and can buffer the pH of rear­
ing water, which works to prevent
the pH of water from dropping by
accelerated nitrification.
Cost effectiveness
This product purifies the existing
water, which means you aren't re­
quired to use so much new fresh
water to refill your pond with
clean water. This will lead to a re­
duction of water heating cost be­
cause you will use the existing
water, which doesn't need to be
heated, for a longer period of
time.
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Comparison between Crystal Sio and
plastic filter commonly used on koi farms
rearing tank
(400L)
*The rearing water was changed so the concentrations of NH4-N and
N0 2-N do not exceed 20mgIL and 40 mglL respectively.
An experimental tank of soaking filtration system
25
:::I
Comparison of the red and blue lines in this figure shows
NH 4 -N concentration drops two days earlier than the red
line. Furthermore, the blue line remains below O.4mg/L
level for a long time. On the contrary, the red line shows
that NH4 -N concentration drop reaches lmg/L but it gradu­
ally increases according to the passage of days. This result
indicates that Crystal Bio's porous structure is superior as a
habitat for microorganisms including nitrifying bacteria.
20
C,
§.
~
r.~
z
o
0
days
1--~cry~s~tali]B!?:ioli!(N9]022i.Ni[)l-
..... 400
Plastic Filter ~N02.N)
-
*Nitrification: chemical action of producing nitrous acid and nitric
acid from ammonia by ammonia oxidizing bacteria and nitrous
acid oxidizing bacteria.
:= ~~::i~l ~ife~ (~6;~~)
30
days
10
::I:
0.
r------------r===;;:::::;:;:::;;;::=i1
7
5 0);-----:''::"0-----::2'::"0-----::3'::"0---~40
days
N0 2-N concentration increases faster, and in greater
amount, in Crystal Bio treated water than by a plastic filter.
It suddenly drops after the twenty-eighth day after the be­
ginning of the test. While N0 2-N concentration decline by a
plastic filter begins after thirty three days.
As for N0 3 -N concentration, it remains below lOmg/L by
Crystal Bio treatment but its concentration by a plastic filter
treatment remains 200 to 250mg/L. This indicates that denitri­
fication was done by anaerobic microorganisms in Crystal Bio.
*Denitrification: chemical action or process of breaking nitrogen
compounds into molecular nitrogen mainly by microbes.
The blue line shows that the pH of the rearing water treated
by Crystal Bio gradually decreases and keeps the water
within a weak alkaline level until the 26th day after the be­
ginning of the test, and then is gradually acidified. This in­
dicates that Crystal Bio itself is a weak alkaline and holds
buffering faculty.
* Similar results were obtained by using sprinkling filtration system.
Crystal Bio used in the sprinkling type filtering tank
Crystal Bio used in the soaking type filtering tank
Micrograph of the inside of Crystal Bio
External form of Crystal Bio
Rough sketch of recirculating system
for koi culture using Crystal Sio
Packing
63C~-----/~4cm
~?
///
Sprinkling type
filtering tank
Crystal Bio Soaking type
(15m 3)
filtering tank
-
I
Cyclone ....
......
.......,
~
E
§
CB-100
CB-1000
Water circulation: 10-12 times/day
Standardized Articles (Floatable Crystal Bio)
Item
CB-100(L)
CB-100(M)
CB-100(S)
CB-1000(L)
CB-1000(M)
CB-1000(S)
•
Size of particle (mm) Volume (L) Weight (kg) /
Dealer
30-50
100
15
100
16
20-30
10-20
100
17
30-50
1,000
150
20-30
1,000
160
10-20
1,000
170
'­
Exclusive exporter
Manufacturer
OGATA KOI FARM CO., LTD.
NIHON KENSETSU GIJUTSU CO., LTD.
2712, Takeshima Yasutake, Kurume,
Fukuoka, 830-0071 JAPAN
Tel +81-942-27-2519 Fax +81-942-27-2180
E-mail info@ogatakoi.com
http://www.ogatakoi.com
1417-1 , Tokusue Kitahata, Karatsu City,
Saga, 847-1201 JAPAN
Tel +81-955-64-2525 Fax +81-955-64-4255
E-mail info@nkg-net.co.jp
http://www.nkg-net.co.jp/