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http://indianaquariumhobbyist.com/community/ :: View topic - Diffusing CO2 in to large cement tanks.
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Diffusing CO2 in to large cement tanks.

 
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thomas
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PostPosted: Wed Dec 19, 2007 7:36 am Post subject: Diffusing CO2 in to large cement tanks. Reply with quote

 Hello,  Friends
 
    Can  anyone  suggest  a  simple  working  method  to  diffuse  co2  into  large  cement  tanks
 mesuring  15  feet  by  5  feet,water  height  2  feet,  this  is  part  of  an  experiment.
 
 
 M.Thomas
 
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Deepak_Brid
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PostPosted: Wed Dec 19, 2007 11:11 am Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hi  Thomas,  
 
 You  can  build  a  CO2  reactor  &  use  pressurized  CO2.  
 IMO,  the  rate  at  which  you  need  to  pump  is  CO2  in  the  Tank  would  be  close  to  10  bubbles  per  second.
 
 Opt  for  pipe  with  d=4”  &  l=2.5’  -  3’.  For  restriction  media  you  can  use  bioballs  or  even  low  density  sponge  would  do.  Along  side  you’ll  need  a  1000lph  power  head  to  drive  it.
 
 On  a  second  thought,  I  hope  the  tank  is  matured  well  in  term  of  cement  curing  &  has  leached  out  lime  completely  â€“  it  won’t  be  good  for  plants  or  fish  Smile  
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harshal
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PostPosted: Wed Dec 19, 2007 11:38 am Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hi  Thomas
 
   IMO  Use  3  reactors  for  this  tank,  the  reactor  design  can  be  the  one  on  this  link
 
 http://indianaquariumhobbyist.com/community/modules.php?name=Forums&file=viewtopic&t=7956
 
 Use  a  3  way  spilter  so  that  you  can  use  the  same  cylinder  for  all  3  reactors.
 As  for  the  placement  of  the  reactors,  use  2  on  either  ends  of  the  tank  and  one  in  the  center.  This  way  the  CO2  content  in  the  tank  will  be  more  even.
 
 Regards
   Harshal
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Deepak_Brid
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PostPosted: Wed Dec 19, 2007 1:15 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

                                                   
harshal  wrote  (View  Post):                
Use  a  3  way  spilter  so  that  you  can  use  the  same  cylinder  for  all  3  reactors.
 As  for  the  placement  of  the  reactors,  use  2  on  either  ends  of  the  tank  and  one  in  the  center.  This  way  the  CO2  content  in  the  tank  will  be  more  even.                

 
 If  there  is  adequate  water  movement  in  the  tank,  I  don’t  see  this  as  a  major  issue.  
 
 I’ve  taken  into  consideration  that  a  PH  rated  at  1000lph  is  raw  output,  unlike  what  most  of  us  use  via  a  filter  Head  rated  at  the  same  capacity  which  drops  close  to  650lhp.  Thomas,  I  would  use  an  existing  /  spare  PH  (~1000lhp)  for  testing  &  later  decide  to  purchase  a  similar  one  or  upgrade  the  PH  with  higher  capacity.  
 
 If  required,  the  flow  can  be  diverted  at  the  output  of  the  Reactor,  maximum  2  outputs.  To  achieve  maximum  flow  &  efficiency,  use  a  â€˜fork’  joint  &  unlike  regular  â€˜T’  joint.  
 
 IMO,  3  reactors  necessarily  means:
 1.  Being  a  DIY  -  it  will  require  more  work  &  time  to  build  the  reactors  &  later  fine  tuning  each  to  their  maximum  efficiency.
 2.  Controlling  CO2  injected  into  each  reactor  at  same  rate  would  require  individual  needle  valves.
 3.  3  power  heads  (PH)  to  drive  each  reactor
 4.  More  investment  for  additional  equipment.
 
 Reactor  placement  can  be  decided  later  once  you  are  certain  about  trying  this  design.
 
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thomas
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PostPosted: Wed Dec 19, 2007 1:17 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Thanks  for  the  valuable  idea's  .  The  tanks  are  matured,10  years  old,  is  there  any  material  for  additional  protective  coating?  This  is  a  pre  project  experiment  to  study   the  possiblities  of  
 introducing  aquarium  plants  to  the  unemployed  village  girls,  to  generate  additional  income.
 M.Thomas
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Deepak_Brid
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PostPosted: Wed Dec 19, 2007 3:01 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

                                                   
thomas  wrote  (View  Post):                
Is  there  any  material  for  additional  protective  coating?                

 
 If  the  tanks  are  waterproofed  on  the  Inside,  you  don’t  need  any  protective  coating.  
 
 Besides,  if  they  have  already  been  used  for  fish  keeping,  there  is  no  reason  to  worry.  
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natbox
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PostPosted: Wed Dec 19, 2007 7:25 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 good  work  mr.thomas!keep  it  up  .  Thumb Up
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nature_lover
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PostPosted: Wed Dec 19, 2007 8:17 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 I  agree  with  Deepak  on  the  price  issue  related  to  having  three  separate  diffusors.  It  is  a  good  idea  to  go  with  splits  on  the  outlets  have  a  good  pump  to  help  the  flow.
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thomas
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PostPosted: Thu Dec 20, 2007 12:45 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hello  ,
   Thank  you  friends  for  your  cooperation  and  valuable  inputs,  one  more  clarification:  Have  any  of  you  tried  a  low  pressure   co2  regulator,  or  having  some  know  how  or  tips  which  will  lead  to  the  deseign  and  fabrication  of  such  regulator,to  be  used  olong  yeast  co2  regulator  ?  Some  of  our  Juniors  are  interested.
 
 M.Thomas
 9843295082  Surprised
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Deepak_Brid
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PostPosted: Thu Dec 20, 2007 5:22 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Thomas,  are  you  referring  to  CO2  regulator  for  a  DIY  setup?  If  so,  it's  not  recommended  to  regulate  the  pressure  for  safety  reasons.  
 
 If  there  is  anything  else  you  are  referring  too,  more  information  would  help.
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Deepak_Brid
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PostPosted: Thu Dec 20, 2007 6:56 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hello  Ravi/Beta/Venkat,  
 
 Just  noticed  this  topic  is  discussed  under  "New  Members  and  Beginners".  
 Can  we  move  this  thread  to  "DIY"  or  "Other  Equipment"  category.
 
 Thanks.
 
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nature_lover
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PostPosted: Fri Dec 21, 2007 8:32 am Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 I  would  suggest  not  using  a  regulator  or  a  diffusor  (airstone  might  be  ok)  with  a  yeast  reactor.  If  something  clogs  up,  you  will  have  a  yucky  smelly  yeast  bomb  waiting  to  blow.
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thomas
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PostPosted: Fri Dec 21, 2007 8:48 am Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hi,
   For  the  experiment  I  am  using  only  co2  cylinders,  the  regulator  for  home  made  co2  reactors  is  the  ambition  of  some  enthusiastic  students.  The  37  th
 all  India  students  science  exibition  is  being  inaugurated  to  day  at  Pondicherry.
 
   M.Thomas
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harshal
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PostPosted: Fri Dec 21, 2007 2:21 pm Post subject: Re: Diffusing CO2 in to large cement tanks. Reply with quote

 Hi  Thomas
 
   Â Well  the  reason  for  saying  3  reactors  was  an  experence  is  my  clients  tank,  where  initially  we  had  used  a  single  reactor  with  a  high  bubble  count  and  high  flow  rate  (  ehiem  2217  &  dolphin  c1200)  but  we  werenot  able  to  acive  the  desired  PH  in  the  tank  the  drop  in  PH  from  the  source  watre  to  the  tank  was  arround  0.1.  Later  we  split  the  CO2  into  2  reactors  and  the  result  was  the  difference  was  arround  0.4,  which  was  our  target  for  the  tank.
   Â As  for  the  costing  cheap  power  heads  are  avilable  in  chenai,  the  only  deterent  in  terms  of  pricing  might  be  the  fine  controls.  The  build  time  for  2  reactors  was  less  than  an  hour,  the  curing  was  24hrs.  Will  try  to  post  the  snaps  of  the  reactor  soon.  Will  PM  you  the  approx  cost  of  the  DIY  set  up  also  for  you  to  get  an  idea.
 
 BTW  a  very  noble  cause  hope  it  works  out.  All  the  Best!!!  Thumb Up  
 Regards
   Harshal
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