AV 
  Terrace 
  Bay 
  -­‐ 
  Effluent 
  Update 
  
Improvements 
  since 
  2014 
  
 
  
 
  
 
  
 
    
    
   avterracebay.com 
  
1 
  

  
  

Primary 
  treatment: 
  
•  2 
  clarifiers 
  to 
  remove 
  solids 
  (mostly 
  fiber) 
  
•  Recovered 
  clarifier 
  sludge 
  is 
  mixed 
  with 
  hog 
  
fuel 
  & 
  burned 
  in 
  the 
  Power 
  Boiler 
  

  
  

Secondary 
  treatment: 
  
64 
  acre 
  ASB 
  (aerated 
  stabilizaJon 
  basin) 
  where 
  
filamentous 
  bacteria 
  consume 
  pollutants 
  

 fluent flows to Lake
Superior via Blackbird Cr.

 

 

 

   
  

 

 

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ADITYA I RLA 
Tm Bay
500 0 1000 m"
Mil me Map

 

 

 

 

 

AV TERRACE BAY

Effluent Plume in
Mob?rly and Jackfish Bays

 

   

Blackbird Creek
1 00%
Bay
Tunnel Bay
0
St. Patrick
Island
Jack?sh Bay


 

ADITYA BIRLA

AV Terrace Bay Inc.

 

Generalized Pan-mot 5mm 0W 'n mum Bay

Q??9.Mesms

 

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. V-

     

Figure 2.1

 

 

 

 

 

 

Mill Effluent in Moberly Bay

Pictures
from 2014

 

ADITYA BIRLA

 

AV TERRACE BAY

 
  

2016: 
  New 
  floaJng 
  “TuOoom” 
  barrier 
  installed 
  near 
  the 
  mouth 
  
of 
  Blackbird 
  Creek 
  to 
  reduce 
  the 
  amount 
  of 
  foam 
  entering 
  
Moberly 
  Bay. 
  Barriers 
  in 
  place 
  prior 
  to 
  2016 
  were 
  suspended, 
  
allowing 
  foam 
  to 
  bypass 
  barrier 
  when 
  water 
  levels 
  in 
  the 
  creek 
  
were 
  low. 
  
 
  

  
  

[1] 
  Implemented 
  process 
  loss 
  minimizaJon 
  program 
  – 
  reduced 
  
losses 
  to 
  mill 
  sewer. 
  

 
  

  
  

[2] 
  Reduced 
  releases 
  to 
  Blackbird 
  Creek 
  – 
  improved 
  effluent 
  
treatment 
  via 
  nutrient 
  management 
  & 
  maintenance 
  on 
  aerators 
  

 
  

  
  

BENTHIC 
  MACROINVERTEBRATE 
  COMMUNITY 
  SURVEY 
  (2014) 
  
•  The 
  sediments 
  of 
  Moberly 
  Bay 
  have 
  been 
  severely 
  impacted 
  
from 
  historic 
  mill 
  operaJons 
  (fiber 
  & 
  oil 
  deposits). 
  

  
  

BENTHIC 
  MACROINVERTEBRATE 
  COMMUNITY 
  SURVEY 
  (2014) 
  
•  The 
  erosional 
  samples 
  from 
  the 
  near 
  field 
  and 
  far 
  field 
  
benthic 
  community 
  exhibited 
  higher 
  invertebrate 
  abundance 
  
and 
  taxa 
  richness 
  suggesJve 
  of 
  mild 
  nutrient 
  enrichment. 
   
  
•  The 
  deposiJonal 
  benthic 
  community 
  has 
  undergone 
  
significant 
  improvements 
  since 
  2006. 
   
  
•  SedimentaJon 
  rate 
  is 
  slow 
  so 
  it 
  could 
  take 
  unJl 
  2039 
  for 
  
natural 
  sedimentaJon 
  to 
  completely 
  isolate 
  the 
  contaminated 
  
sediments. 
  

  
  

FISH 
  SURVEY 
  (2014): 
  longnose 
  & 
  white 
  suckers 
  
•  Observed 
  effects 
  on 
  fish 
  are 
  lower 
  average 
  age 
  and 
  higher 
  
condiJon 
  (weight, 
  length, 
  etc.) 
  compared 
  to 
  Mountain 
  Bay 
  
reference 
  site. 
  
•  InvesJgaJon 
  of 
  cause: 
  
–  Effluent 
  provides 
  nutrient 
  enrichment 
  and 
  high 
  organic 
  content 
  in 
  
sediment 
  support 
  higher 
  density 
  of 
  benthic 
  invertebrates 
   
  
–  More 
  food 
  available 
  to 
  suckers 
  improves 
  fish 
  condiJon 
  

•  CorrecJve 
  acJons: 
  
–  Manage 
  nutrients 
  in 
  effluent 
  treatment 
  to 
  minimize 
  releases 
  to 
  
Blackbird 
  Creek 
  without 
  compromising 
  effluent 
  treatment 
   
  
–  Reduce 
  process 
  losses 
  to 
  mill 
  sewers 
  

 ?rm?5r 



 



Air data if question

 

 

Odour History in Terrace Bay

(not including shutdown years)
2.5 

2.0 -

2"
U1

Annual Average (ppb)

'o

0.5 

 

0.0

6,9 104{5?56 sq?g? 36% ?990 '59 ?98 '69? '59" ?99 1900 m?t ?90? $96, '59? '90" $69 we)

 

15

 

Temp



1o 15 20 25
Altitude 1000 feet)

 

 

30

 

 .cool my

 

    

16