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| | | Forum Guru
 
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Last Login: 4/30/2008 12:04:46 PM
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| | SITUATION: we are adding sodium hydroxide to our aerobic digesters to raise the pH in order to control the foam. I have conducted a bench test in the lab that tells me that in order to reach above a 7pH, we need to add 200 gallons of the sodium hydroxide to 200,000 gallons of sludge that is in the digester. QUESTION: Is there a calculation that factors in the increments of 10 that pH is? Or can i just figure out the gallons of sodium hydroxide needed to the gallons of sludge that we have? I have done the calculating, i just don't know if i need to factor in that pH is in increments of 10. Thanks!! |
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| | | Supreme Being
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| | Labrat, No. If your numbers from the lab are correct (as in the 200gallons for 200000gallons) it should be a similar number in the field. I would start by adding 50 gallons and test the ph , then another 50 and so on just to check that things are going okay. Is sodium hydroxide the best chemical? I thought that lime might do a better overall job. Regards TerryF |
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| | | Supreme Being
Group: Forum Members
Last Login: Yesterday @ 6:41:52 PM
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| I would recommend that you do another lab test, plotting pH versus the amount of NaOH that you have added. Then, just factor up your field addition.
Jeff Naumann
(310) 540-0045
FAX (310) 540-0337
http://www.jeffnaumannassociates.com/ |
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| | | Forum Guru
Group: Forum Members
Last Login: 4/30/2008 12:04:46 PM
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| | thanks for all of your input!!! |
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| | | Junior Member
Group: Forum Members
Last Login: 4/22/2008 12:38:50 PM
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| | Do you have submersible mixers in your digester ? If so you may be able to cycle your blower system off/on to the digester and reduce foam. I would also consider monitoring your PH and as well as Nitrate during the off cycle to see if any denitrification is happening when your digesters are in an anoxic state. Careful don't go septic. |
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