Detailed document No.2

2 Wastewater treatment without

the need for pressurized flotation● First class hotel kitchen wastewater

treatment example

Aquablaster diffusion pipe
2019.12

■ Problems solved and costs reduced

Sewage treatment room in the basement

Aquablaster diffusion pipe

Pressurized flotation device

Before installing an Aquablaster diffusion pipe system,
100m3 /day of kitchen wastewater treatment was carried out using a pressurized flotation device.

Treatment using a pressurized flotation device had the following problems.
The cost of sludge treatment was high.
A toxic gas such as hydrogensulfide was generated.

It took too much labor and cost for
maintenance.
BOD was not likely to decrease easily.

These are some of the problems that occurred.
❶■ Conventional treatment flow

Hydrogensulfideproduced!

CoagulanttankCoagulant
tank

Aquablaster diffusion pipe

Dehydrating
deviceCoagulant
aid tank

A cost of 12 million
yen or so per year
required for sludge
treatment!!

SludgehopperMeasuringtank
Reactor Adjustment
tankIndustrial
waste

Coagulation
tank

P

P
Pressurizing unit

It costs toomuch timeand money.
Inflow

P
Pressurized
Sludgeflotation tank discharge pump

Scum
receivingpump

Official
guidance
on waterquality

Blower
Discharge

Flow adjustment tankFirst treatment tank

Second treatment tank Third treatment tank

Fourth treatment tank❷

■ Aquablaster diffusion pipe system installed in the tank

Aquablaster diffusion pipe

To solve the problems, the Aquablaster diffusion pipe type AS
was installed in the water tank and bio-supply was introduced.

❸

■ Water quality of raw water and treated water Aquablaster diffusion pipe

Raw water

BOD : 800mg/L
S S : 600mg/L
n-hex : 150mg/L

Treated water

BOD : 120mg/L
S S : 80mg/L
n-hex : 10mg/L

As shown in these photos, the difference in quality can be seen clearly.
❹■ Pressurized flotation no longer needed

CoagulanttankMeasuringtank

Coagulanttank

12 million yen or so spent per
year for sludge treatment.
The cost became zero yen!!

Coagulant
aid tank

Dehydrating
devicePressurized flotation no longer needed
Reactor Adjustment
tank

Aquablaster diffusion pipe

Coagulation
tank

SludgehopperIndustrial waste

P

P

P
Pressurizing unit

Pressurizedflotation tank

Sludgedischarge pump

Supply ofdegrading bacteria

Scum
receivingpump

BlowerInflow
Discharge

Flow adjustment tankFirst treatment tank Second treatment tank Third treatment tank Fourth treatment tank❺

■ Cost comparison before and after introduction Aquablaster diffusion pipe

The calculation result shows that since the installation of the Aquablaster
diffusion pipe in 1998, costs have been reduced by almost 20 million yen per year.

Annual cost comparison table
AquablasterAmount difference

Item

Previous treatment

Cost of sludge collection

12,000,000

0▲12,000,000

Cost of chemical agents
such as coagulants

5,840,000

0▲ 5,840,000

Cost of power consumption

1,800,000

1,950,000

150,000

Labor costs fornighttime management

3,285,000

0▲ 3,285,000

Bio01,200,000

1,200,000

Periodic maintenance0600,000

600,000

22,925,000

3,750,000▲19,175,000

Total

❻

■ Comparison target table
Activated sludge

Installation
space
Initial costs
Running
costs
Odor
generation
Treatment
capability
Operation
management

Aquablaster diffusion pipe

Pressurized flotation device Aquablaster diffusion pipe
YES

MAYBE

Installation is possible as far as themachine and installation space areavailable.

Installation is possible in a space equal
to 1/3 to 1/4 of the space required foran activated sludge system.

NO

YES

MAYBE

A large water tank and sludge
treatment equipment are required.

Only the cost of a pressurized
fl o t a t i o n d e v i c e a n d s l u d g edehydration unit is required.

A treatment tank of a certain size isrequired.

MAYBE

NO

YES

Costs are mounting for sludge
treatment and operation
management.

Costs are mounting for sludge
treatment, chemical agents, andoperation management.

Only the cost of electricity and thecost of bio-supply are required.

MAYBE

NO

YES

Hydrogen sulfide and rotting odors
are generated in the sludge storage
tank.

Structurally, hydrogen sulfide androtting odors are generated.

An offensive odor substance sucha s h y d r o g e n s u l fi d e i s n o t
generated.

YES

NO

YES

Wastewater can be treated up tolevels equal to river discharge
standards.

A problem with BOD treatment
remains.

Wastewater can be treated up tolevels equal to sewage discharge
standards.

NO

NO

YES

For such work as sludge
concentration control, dedicatedpersonnel need to be assigned.

For chemical agent injection, sludge
control, and others, a considerable
amount of labor is required.

Roughly, only machine operation
check is requiredNOA large area is required.

❼■ Hydrogen sulfide generation suppressed

Aquablaster diffusion pipe

Before the installation of the Aquablaster diffusion pipe, the hydrogen sulfide
concentration was so high that it was dangerous even for management operation.
However, after the introduction of the Aquablaster diffusion pipe,
no hydrogen sulfide was generated.

First
treatment
tank

Fourthtreatmenttank /
Discharge
tank

H2S :
0.0ppm
PH value :
7.0

H2S :
0.0ppm
PH value :7.8

The measuring instrument
in use is a precision sensor
that issues an alarm signal
when hydrogen sulfide is
generated.

[ Measuring instrument ]New Cosmos Electric Co.,Ltd.
Oxygen And Hydrogen Sulfide Detector
XOS326Detection principle:
Constant potential electrolysis type
Indication accuracy: FS± 0.5vol %❽■ Other wastewater treatment equipment supply examples Aquablaster diffusion pipe
Waste plastic recycling plant (12 sets OEMed to Nikko)

Supplied／December 2003...

Unit mg/L

Raw water

Food processing factory wastewater treatment

Treated water River discharge

BOD

2000

80

100 or less

COD

1600

70

100 or less

SS

2000

40

30 or less

N-Hex

200

1

5 or less

Supplied／May 2001

SHIMADZU CORPORATION Seta factory Kitchen & industrial wastewater treatment

Supplied／November 2002

Supplied／October 2001

Supplied／January 2009

Treated water Sewage discharge

Unit mg/L

Raw water

BOD

450

5

300 or less

SS

430

4

300 or less

N-Hex

380

2

（Mineral）5 or less

Food waste recycling plant wastewater treatment

Treated water Sewage discharge

Unit mg/L

Raw water

300 or less

BOD

150

10

80

300 or less

SS

100

10

12

30 or less

N-Hex

15

1

Unit mg/L

Raw water

BOD

1200

85

SS

800

N-Hex

120

Supplied／July 2005

Treated water Discharge standard

Water being
circulated andreused as
coolant water
for machines

Food processing factory wastewater treatment

Major hotel (modification work) Kitchen wastewater treatment

Unit mg/L

Raw water

Unit mg/L

Raw water

BOD

2100

350

400 or less

BOD

680

78

200 or less

SS

1500

200

300 or less

SS

500

57

200 or less

N-Hex

150

10

30 or less

N-Hex

350

Treated water Value in the contract

35

40 or less

Supplied／February 1999

Treated water Sewage discharge

Food processing factory wastewater treatment

SHIMADZU CORPORATION Head office Kitchen wastewater treatment

Unit mg/L

Raw water

Unit mg/L

Raw water

BOD

1200

220

300 or less

BOD

2000

100

200 or less

SS

800

300

300 or less

SS

2500

120

200 or less

N-Hex

400

20

30 or less

N-Hex

250

15

30 or less

Treated water Discharge standard

Supplied／September 2007

Treated water Sewage discharge❾

https://www.aience.co.jp/