Comparison Between HCS and SCS for Waste Collection Efficiency
Comparison between HCS, SCS
HCS:
Used and
suitable
for:
1.
Removal of waste from sources of high
G.R.
2.
Eliminate handling time of many
small
container.
3.
Eliminate unsightly
accumulation
associate
with
the use
of
a
great
no. of
small
container.
4.
Flexibility,
possibility of
using
container of
different
sizes and
shapes
for
all
types
of
wastes.
5.
Require only one truck
and
driver to accomplish collection
cycle.
6.
Container size
is
of
great
economic importance
compaction
add
economic advantages and unloading
facilities.
SCS:
1.
Used
for
all
type
of
wastes.
2.
It
vary
according to
type
and quantity of
wastes
to
be
handled.
3.
It
vary according to
No. of
generation
points and
the
loading
process of vehicles.
4.
Require more
crews
so it is
more
expensive.
Generally,
collection, equipts
for
HCS
and
SCS
differ
in
size
and
capacity,
and characteristics, the
following, considered,
must
be
classified.
1.
Suitable cover with provision for
easy loading
and
un
loading
2.
Water tight
constant preferably metallic
to
prevent
leakage and
spill and easily
cleaner.
1
3.
Truck
capacity depend
on
waste collection,
loading weight,
man
power
requirement.
Services
organization
for
collection
of
S.W
in urban
areas can
be
mad
by
1.
City
employees
(municipality administrated program)
2.
Private
firms
that contract with
municipality.
3.
Private
firms
that
contract
with
private residents.
-A
city
determine what
type
of
S.W to be
collected and from
whom?
In
some
municipality certain
types
of
wastes
demolition are not
collected, only garbage
is
collected.
-
Hazardous waste are
generally
excluded from
regular
collection
because of collation
dangers.
Frequency of
collection:
-
It
refers
to
the No., of collection per
week
from
a
specified
area
or location.
-
The proper
frequency, for
the most
satisfactory
and
economical
services
given
by the
amount
of
S.W
that must
be
collected,
by
climate, cost and public health
requirements.
-
For
collection of
S.W
that conation (garbage) the maximum
period
between
alterative collection
shout
not
be
greater
than:
1.
Normal
time
for
the
accumulation of the amount refuse
that
can
be
stored in
a
volume of reasonable
size.
2.
The time
it
takes
for garbage
to
putrify
and
emit foul odors under
average
storage
conditions.
2
3
3.
The length of the fly-breeding
cycle,
which
during
hot
summer
is
less
than
7
days.
The
majority
frequency
in
(U.S.A)
is
once/weak
In
Iraq
frequency of collection
better
in
Summer
(2-3)
time, and
winter
once
week.
Greater
frequency of collection
is
of the
following
advantages:
Cleaner
city,
convenient
for citizens fewer
and
smaller
containers
needed,
garbage purification,
less flies
and
rodents, more
refuse collected, But Cost of collection
is
high, more equipments
and labour
requirement.
Time
of
collection:
Collection time
vary
according
to
the area and source of
S.W
-
In
residential areas, collection
is done
mostly
during
regular
working
hours
of
the
day.
-
N
i
g
h
t
c
oll
e
c
ti
o
n
i
n
b
u
s
in
e
ss
a
r
e
a,
M
a
r
k
e
t
,
c
o
m
m
e
r
c
i
al
a
n
d
Industrial establishment
favored.
Analysis of collection
system
-
To
establish
vehicles
and labour
requires for
various collection
system
and
methods.
-
The unit time
required
to
perform
each
task
in
the
system
must
be
determined.
collection activities (tasks) can
be
separated into unit operations
as
follow:
1.
Pick
Up:
definition for
SCS
and
HCS
a.
SCS:
Time spent loading the collection
vehicles.
4
b. HCS:
Time
spent
driving
to
the next container after
an
empty
container
has
been
deposits
and
the time spent picking
up
the loaded
container and the
time
requirement
to redeposit
the
container
after
its
contents has
been
emptied.
2.
Haul
(H)
a.
SCS:
time required
to
reach
the disposal site starting after the
vehicle
is
filled
pluse time
after leaving the disposal site until arrival
at the
location of the
next
collection
route.
b.
HCS:
time
required
to reach
the
disposal site starting
after
loading the container on
truck
time
after
leaving
the
disposal site
to
the
location
where
the empty
container
is
to
be
redeposit.
3.
At
site
for HCS
and
SCS:
time spent the disposal site
waiting
and
un
loading.
4.
Off
route
:
for
both
system
include all
time
spent
on
activities
that
are non productive
,
such
as:
-
Checking in and
out at
beginning and end of
day
work.
-
Time spent
to
the first
pick
up
point.
-
Time spent due
to
congestion.
-
Time spent
an
equipt.
repair
and
Maintenance.
-
Time spent
for lunch
in
excess
of
the
started
period.
HCS and SCS are two waste collection systems with specific uses and advantages. HCS is ideal for high generation rate waste removal, eliminating handling time, and allowing flexibility in container sizes. On the other hand, SCS is versatile for all types of wastes but requires more crews, making it more expensive. Collection equipment for HCS and SCS differ in size, capacity, and characteristics, impacting their efficiency and cost-effectiveness.
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Presentation Transcript
Comparison between HCS, SCS HCS: Used and suitable for: 1.Removal of waste from sources of high G.R. 2. Eliminate handling time of many small container. 3.Eliminate unsightly accumulation associate with the use of a great no. of small container. 4.Flexibility, possibility of using container of different sizes and shapes for all types of wastes. 5.Require only one truck and driver to accomplish collection cycle. 6.Container size is of great economic importance compaction add economic advantages and unloading facilities. SCS: 1.Used for all type of wastes. 2.It vary according to type and quantity of wastes to be handled. 3.It vary according to No. of generation points and the loading process of vehicles. 4. Require more crews so it is more expensive. Generally, collection, equipts for HCS and SCS differ in size and capacity, and characteristics, the following, considered, must be classified. 1.Suitable cover with provision for easy loading and un loading 2.Water tight constant preferably metallic to prevent leakage and spill and easily cleaner. 1
3. Truck capacity depend on waste collection, loading weight, man power requirement. Services organization for collection of S.W in urban areas can be mad by 1. City employees (municipality administrated program) 2. Private firms that contract with municipality. 3. Private firms that contract with private residents. -A city determine what type of S.W to be collected and from whom? In some municipality certain types of wastes demolition are not collected, only garbage is collected. - Hazardous waste are generally excluded from regular collection because of collation dangers. Frequency of collection: - It refers to the No., of collection per week from a specified area or location. - The proper frequency, for the most satisfactory and economical services given by the amount of S.W that must be collected, by climate, cost and public health requirements. - For collection of S.W that conation (garbage) the maximum period between alterative collection shout not be greater than: 1.Normal time for the accumulation of the amount refuse that can be stored in a volume of reasonable size. 2.The time it takes for garbage to putrify and emit foul odors under average storage conditions. 2
3. The length of the fly-breeding cycle, which during hot summer is less than 7 days. The majority frequency in (U.S.A) is once/weak In Iraq frequency of collection better in Summer (2-3) time, and winter once week. Greater frequency of collection is of the following advantages: Cleaner city, convenient for citizens fewer and smaller containers needed, garbage purification, less flies and rodents, more refuse collected, But Cost of collection is high, more equipments and labour requirement. Time of collection: Collection time vary according to the area and source of S.W - In residential areas, collection is done mostly during regular working hours of the day. - Night collection in business area, Market, commercial and Industrial establishment favored. Analysis of collection system - To establish vehicles and labour requires for various collection system and methods. - The unit time required to perform each task in the system must be determined. collection activities (tasks) can be separated into unit operations as follow: 1. Pick Up: definition for SCS and HCS a. SCS: Time spent loading the collection vehicles. 3
b. HCS: Time spent driving to the next container after an empty container has been deposits and the time spent picking up the loaded container and the time requirement to redeposit the container after its contents has been emptied. 2. Haul (H) a.SCS: time required to reach the disposal site starting after the vehicle is filled pluse time after leaving the disposal site until arrival at the location of the next collection route. b. HCS: time required to reach the disposal site starting after loading the container on truck time after leaving the disposal site to the location where the empty container is to be redeposit. 3.At site for HCS and SCS: time spent the disposal site waiting and un loading. 4.Off route: for both system include all time spent on activities that are non productive , such as: - Checking in and out at beginning and end of day work. - Time spent to the first pick up point. - Time spent due to congestion. - Time spent an equipt. repair and Maintenance. - Time spent for lunch in excess of the started period. 4
