You are the lead technical officer at the Environmental Management Authority. You have been asked to investigation the sightings of brown effluent in Brasso Seco. It is believed to be either raw sewage or insufficiently treated cocoa waste from chocolate production. Consider the data in Figure 1 and Table 2 and discuss the following: Discuss the biotic and abiotic processes and factors that would have contributed to the observations, establish the source of origin of the mysterious effluent, and outline whether the parameters are of environmental concern
You are the lead technical officer at the Environmental Management Authority. You have been asked to investigation the sightings of brown effluent in Brasso Seco. It is believed to be either raw sewage or insufficiently treated cocoa waste from chocolate production. Consider the data in Figure 1 and Table 2 and discuss the following: Discuss the biotic and abiotic processes and factors that would have contributed to the observations, establish the source of origin of the mysterious effluent, and outline whether the parameters are of environmental concern
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Author:Elaine N. Marieb, Katja N. Hoehn
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You are the lead technical officer at the Environmental Management Authority. You have been asked to investigation the sightings of brown
effluent in Brasso Seco. It is believed to be either raw sewage or insufficiently treated cocoa waste from chocolate production. Consider the data
in Figure 1 and Table 2 and discuss the following: Discuss the biotic and abiotic processes and factors that would have contributed to the observations, establish the source of origin of the mysterious effluent, and outline whether the
parameters are of environmental concern
![table 2
Tabulated Data Results for sample sites 1 to 5
Site
Parameter
1
2
5
6.
Site description
Main river, fast
flowing, substrate river with
Tributary, 2
Tributary, 2
SSE of site 4.
East of Site 5.
South of site
Downstream
Area of high
siltation and
and SE of sites river with slow Further
6. Visible
1 and 2. High to medium
mixing and
turbulence.
downstream
turbidity and
brown clay
the east of the suspended
sediment.
natural with small medium flow.
pebbles. East of a Only two
residential
Evidence of cocoa units with
septic
systems.
flow.
of the sites 1
deposition to
Residential
community
west of the
forested zone.
and 3.
sight.
processing and
treatment.
stream.
7.04
7.23
8.95
6.01
6.04
pH
Dissolved Oxygen
in situ (mg/L)
7.10
7.06
8.99
8.84
8.57
3.25
2.19
6.45
6.65
Initial
dissolved
8.95
8.87
8.67
6.65
6.35
6.25
6.65
Oxygen
(mg/ L)
Dissolved
Охудen at
8.08
8.02
8.05
3.01
2.01
2.01
5.25
day 5 (mg/
L)
Volume of
sample
used
300
300
100
100
100
150
150
Dissolved
охудеn at
day
14(mg/L)
Fecal Coliform
(units/ mL)
7.95
6.01
7.49
1.57
1.01
1.34
2.24
2
7*10
9*10
5*10"
1*10
ESST 2006: Pollution Biology
Assignment #2
Nitrates (mg/L]
Nitrites (mg/L)
Ammonia (mg/L)
Iron (mg/L)
Mercury (mg/L)
DDTS (mg/L)
3.0
5.0
4.3
25
10
3.5
3.2
2.1
2.3
25.1
27.1
65.1
68.1
13.1
4
10.0
18.0
475
375
231
185
1.0
18.0
20.1
28.4
16.7
12.8
10.0
0.005
0.01
0.02
0.001
0.002
0.005
Caddisfly
larvae and
0.01
0.01
0.01
0.001
0.006
0.02
0.02
0.02
Dominant
Damselfly
nymph
Damselfly
nymph
communities
Rat tailed
Stonefly nymph
Sewage larvae
Leeches
dragonfly
maggots
nymph
For BOD consideration
2.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8d526b91-5f9a-4ec4-8db1-44ff822020a7%2F8902c48a-4b4d-42e8-9b57-4eec11a5d84a%2Fahj07sd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:table 2
Tabulated Data Results for sample sites 1 to 5
Site
Parameter
1
2
5
6.
Site description
Main river, fast
flowing, substrate river with
Tributary, 2
Tributary, 2
SSE of site 4.
East of Site 5.
South of site
Downstream
Area of high
siltation and
and SE of sites river with slow Further
6. Visible
1 and 2. High to medium
mixing and
turbulence.
downstream
turbidity and
brown clay
the east of the suspended
sediment.
natural with small medium flow.
pebbles. East of a Only two
residential
Evidence of cocoa units with
septic
systems.
flow.
of the sites 1
deposition to
Residential
community
west of the
forested zone.
and 3.
sight.
processing and
treatment.
stream.
7.04
7.23
8.95
6.01
6.04
pH
Dissolved Oxygen
in situ (mg/L)
7.10
7.06
8.99
8.84
8.57
3.25
2.19
6.45
6.65
Initial
dissolved
8.95
8.87
8.67
6.65
6.35
6.25
6.65
Oxygen
(mg/ L)
Dissolved
Охудen at
8.08
8.02
8.05
3.01
2.01
2.01
5.25
day 5 (mg/
L)
Volume of
sample
used
300
300
100
100
100
150
150
Dissolved
охудеn at
day
14(mg/L)
Fecal Coliform
(units/ mL)
7.95
6.01
7.49
1.57
1.01
1.34
2.24
2
7*10
9*10
5*10"
1*10
ESST 2006: Pollution Biology
Assignment #2
Nitrates (mg/L]
Nitrites (mg/L)
Ammonia (mg/L)
Iron (mg/L)
Mercury (mg/L)
DDTS (mg/L)
3.0
5.0
4.3
25
10
3.5
3.2
2.1
2.3
25.1
27.1
65.1
68.1
13.1
4
10.0
18.0
475
375
231
185
1.0
18.0
20.1
28.4
16.7
12.8
10.0
0.005
0.01
0.02
0.001
0.002
0.005
Caddisfly
larvae and
0.01
0.01
0.01
0.001
0.006
0.02
0.02
0.02
Dominant
Damselfly
nymph
Damselfly
nymph
communities
Rat tailed
Stonefly nymph
Sewage larvae
Leeches
dragonfly
maggots
nymph
For BOD consideration
2.
Transcribed Image Text:Figure 1: Map showing areas of interests and sample locations
1 st settlement
primary
tributary
forested zóne
drying bed
for cocoa
"secondarý
large boulders
tributary
main river course
area of high
deposition
2nd settlement
LEGEND
residential
area of high
erosion
housing
water
sample site
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