| |
According to the
statistics made by Korea Car Wash
Association, the number of car
washes in Korea has increased
rapidly and reached 10,000. Approximately
300 companies specializing in
wastewater treatment facility
construction are registered on
the Ministry of Environment and
all of the companies have technicians
& engineers in water quality
inspection, engineering works,
electricity, machinery & chemicals
industry and laboratory. About
10 companies including Sehan Environment,
Samjin Environment and Ahsung
Environment are the active players
in wastewater treatment facility
construction for car-wash business.
It is reported that the number
of companies engaged in wastewater
prevention facility is not large
enough to meet rapidly increasing
needs for wastewater treatment
of businesses. The market of wastewater
prevention/treatment business
is expected to flourish as the
requirements of environment-related
laws are more strongly imposed
and more and more companies are
recognizing the significance of
the facility. |
| [Standard
for disposal allowance under Water
quality preservation law] |
| |
The Ministry of Environment classifies
land into 4 categories to each of
which different standard is applied
in terms of disposal allowance.
|
| |
|
| ■
Land classification |
| |
|
| |
① Clean area: An area designated
& announced by the Minister
of Environment as that which exerts
an influence upon the quality of
waters which should remain at Class
1 in terms of environment standard
(water quality).
② Area “A”: An area designated &
announced by the Minister of Environment
as that which exerts an influence
upon the quality of waters which
should remain at Class 2 in terms
of environment standard (water quality).
③ Area “B”: An area designated &
announced by the Minister of Environment
as that which exerts an influence
upon the quality of waters which
should remain at Class 2 in terms
of environment standard (water quality).
④ Area of special example: An area
designated by the Minister of Environment
as that for final treatment of industrial
complex wastewater or that designated
by a mayor or county governor as
an agricultural/industrial complex
in accordance with the Article 8
of Industry Location & Development
Law.
* Disposal allowance standard for
each area
Water quality environment protection
law prescribing the allowance of
disposal is getting stricter.
|
| |
| <Table>
Disposal allowance standard
(Unit: ㎎/ℓ) |
Classification
|
Clean
area |
Area
(A) |
Area
(B) |
| Item |
| PH |
5.8~8.6 |
5.8~8.6 |
5.8~8.6 |
| COD |
Below 50 ㎎/ℓ |
Below 90㎎/ℓ |
Below 130㎎/ℓ |
| SS |
Below 40㎎/ℓ |
Below 80㎎/ℓ |
Below 120㎎/ℓ |
| NH(광유류) |
Below 1㎎/ℓ |
Below 5㎎/ℓ |
Below 5㎎/ℓ |
| ABS |
Below 3㎎/ℓ |
Below 5㎎/ℓ |
Below 5㎎/ℓ |
|
| ▶ Remarks:
The above standards are effective
as of August 9, 1989. |
|
| |
|
| [How
to manage wastewater treatment facility] |
| |
|
| ■
Purpose of maintenance/management |
| |
|
| |
① To secure normal operation conditions
for efficient & safe treatment
② To prevent damage & defect
to machines such as pump, agitator,
blower, measurement instrument and
controlling device which may cause
the operation of treatment facility
to be interrupted
③ To secure expected life span of
wastewater treatment facility and
machinery. For this, the quality
& amount of water after/before
treatment should be measured as
well as operation management of
treatment facility such as machinery
inspection, repair & maintenance,
adjustment and chemicals replenishment
should be conducted on a daily,
weekly, monthly or yearly basis.
|
| |
|
| ■
Principles of maintenance/management |
| |
|
| |
① For the fluent operation of
wastewater treatment facility, it
is required to fully understand
the composition & structure
of the facility.
② Operation management of wastewater
treatment facility should comply
with operation guidelines.
③ To prevent the defect or damage
to machinery devices and measurement
instrument, cleaning of & oil-supply
for pump, motor & agitator and
adjustment & repair/management
of automatic controlling measurers
including PH meter should be conducted
on a regular basis.
④ Supplies such as belt, packing
and oil should be replaced on a
regular basis.
⑤ If any problem or disorder is
detected during machinery inspection,
it should be repaired or solved
immediately.
⑥ The quality of water after treatment
should be monitored to make sure
treatment facility is functioning
properly. Even when its quality
is above required level, inspection
of machines should be conducted
and the operation of treatment facility
should be monitored and checked.
⑦ The amount & quality of water
before treatment should be measured
and compared with design specification
on a regular basis to see if overload
is given to the facility. If overload
is deemed to exist, a countermeasure
should be taken such as the adjustment
of operation conditions.
⑧ Those who are in charge of facility
management should watch it carefully
all the time and keep in close communication
with one another.
⑨ Maintenance/management should
be written and reported on a form
to be on file. |
| |
|
| ■
Guideline for wastewater treatment
facility management |
| |
|
| |
① For the proper management of
wastewater treatment facility, it
is required to fully understand
the composition & structure
of the facility.
② Operation management of wastewater
treatment facility should comply
with operation guidelines.
③ To prevent the defect or damage
to machinery devices and measurement
instrument, cleaning of & oil-supply
for pump, motor & agitator and
adjustment & repair/management
of automatic controlling measurers
including PH meter should be conducted
on a regular basis.
④ Supplies such as belt, packing
and oil should be replaced on a
regular basis.
⑤ If any problem or disorder is
detected during machinery inspection,
it should be repaired or solved
immediately.
⑥ The quality of water after treatment
should be monitored to make sure
treatment facility is functioning
properly. Even when its quality
is above the level required, inspection
of machines should be conducted
and the operation of treatment facility
should be monitored and checked.
⑦ The amount & quality of water
before treatment should be measured
and compared with design specification
on a regular basis to see if overload
is given to the facility. If overload
is deemed to exist, a countermeasure
should be taken such as the adjustment
of operation conditions.
⑧ Those who are in charge of facility
management should watch it carefully
all the time and keep in close communication
with one another.
⑨ Maintenance/management should
be written and reported on a form
to be on file. |
| |
|
| ■
Machinery inspection |
| |
|
| |
● Pipe laying
① Is water-flow normal?
② Isn’t alien substance such as
sand or waste clogging a pipe?
③ Isn’t water leaking?
④ Is any pipe damaged?
● Pump
① Are the current and temperature
of motor normal?
② Is any strange noise or vibration
detected due to axis vibration?
③ Are rotation wings not blocked?
④ Is level control by water gauge
conducted normally?
⑤ Is packing for 수봉 normal?
● Agitator
① Is agitation conducted normally?
② Is the temperature of current
balance of motor normal?
③ Is any strange noise or vibration
detected in drive?
④ Is oil sufficient or isn’t it
obsolete or deteriorated?
⑤ Do any alien substances get
in wings?
● Ventilator
① Is the temperature of current
balance of motor normal?
② Is oil sufficient or isn’t it
obsolete or deteriorated?
③ Is any strange noise or vibration
detected?
④ Are the indicators of pressure
gauge normal?
⑤ Is the elasticity of power/transmission
belt normal?
⑥ Does bolt tighten properly?
● Sedimentation basin drive
① Is the temperature of current
balance of motor normal?
② Is oil sufficient or isn’t it
obsolete or deteriorated?
③ Is any strange noise or vibration
detected in drive?
④ Does bolt tighten properly?
● Chemicals injector
① Are chemicals injected sufficiently?
② Is the concentration of chemicals
appropriate (checked by aerometer)?
③ Aren’t chemicals leaking?
④ Is the injection of chemicals
linked with PH meter?
● Level switch
① Isn’t the surface of electrodes
polluted?
② Is the location of each electrode
right?
③ Does pump operate properly at
the preset level?
④ Doesn’t any problem exist in
association with insulation?
● PH Meter
① Isn’t electrode damaged?
② Isn’t the surface of electrodes
polluted?
③ Is the amount of potassium chloride
proper?
④ Isn’t the part of connector
polluted or eroded?
|
| |
|
| |
Maintenance/management on a regular
basis is required after the construction
& installation of wastewater
treatment facility. Without sufficient
and proper maintenance/management,
wastewater treatment facility can
not function right. It is required
to assign a person who is fully
responsible for the operation of
wastewater treatment facility. Unfortunately,
many businesses assign a part-time
or temporary employee who does not
fully understand the facility in
spite of the requirement of environment
laws. Another problem associated
with it is the fact that temporary
employees quit their job frequently
and the facility is subject to the
lack of management, which can cause
mechanical trouble due to unfamiliarity
with the operation of the facility
and be caught in a crackdown. For
the efficient management of wastewater
treatment facility, it is essential
to assign a person who is acquainted
with its operation to manage the
facility. |
| |
|
| <Table>
Inspection points for each process
|
| Process |
Inspection
points
|
Inspection
interval |
Storage
basin
(Flow adjustment basin) |
1. Water quality analysis
(PH, COD)
2. Damage & clogging
of blower
3. Damage & clogging
of air pipes
4. Removal of sludge in
the basin |
3-4 times/week
Once/week
Daily
Twice/year |
| Reaction
basin |
1. Agitator (Refer to Clause
3~7)
2. PH Meter(Refer to Clause
3~7)
3. Condition of painting
and damage check
4. Removal of sludge in
the basin
|
Daily
Daily
Yearly
Twice/year |
| Sedimentation
basin |
1. Drive check (Refer to
Clause 3~5)
2. Scum & deposit, counter-current
of treated water |
Daily
Daily |
| Processing
basin |
1. Same with Flow adjustment
basin |
Remarks |
| Filter
basin |
1. Pressure gauge check-역세결정
Treated water analysis-역세
교체결정
2. Treated water analysis-여재
교체결정
|
Daily
Twice/week
|
| Releasing
basin |
1. Muddiness check of released
water
2. Deposit check |
Frequently
(Daily) |
|
| |
|
| [
Standard for pollutant disposal
allowance] |
| |
|
| <Table>
Standard for pollutant disposal
allowance |
| Scale |
Wastewater
disposal of over 3,000㎡/day |
Wastewater
disposal of less than 3,000㎡/day |
Item
Classification |
Biochemical
oxygen demand
(㎎/ℓ) |
Chemical
oxygen demand
(㎎/ℓ) |
Amount
of floating matters
(㎎/ℓ) |
Biochemical
oxygen demand
(㎎/ℓ) |
Chemical
oxygen demand
(㎎/ℓ) |
Amount
of floating matters
(㎎/ℓ) |
| Clean
area |
Below 30 |
Below 40 |
Below 30 |
Below 40 |
Below 50 |
Below 40 |
| Area
“A” |
Below 60 |
Below 70 |
Below 60 |
Below 80 |
Below 90 |
Below 80 |
| Area
“B” |
Below 80 |
Below 90 |
Below 80 |
Below 120 |
Below 130 |
Below 120 |
| Area
of special example |
Below 30 |
Below 40 |
Below 30 |
Below 30 |
Below 40 |
Below 30 |
|
| |
|
 |
| |
Standard for pollutant
disposal allowance prescribed by
Water quality environment protection
law is shown in the following table.
The tendency is toward more rigid
enforcement. |
| |
| |
