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| | | Forum Newbie
Group: Forum Members
Last Login: 7/1/2009 1:55:02 PM
Posts: 2, Visits: 69 |
| | We are currently adding Calcium hydroxide for additional alkalinity (liquid) and have been experiencing the typical issues with plugging, pump failures, etc. Does anyone know of installations or methods that work well with relatively little maintenance? The volumes are relatively small at ~200 gpd of 10-15% (DW) slurry. We use a recirculation pump system to keep it mixed and dose the small amount from the mixed tank. |
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| | | Supreme Being
Group: Forum Members
Last Login: Today @ 5:41:52 PM
Posts: 333, Visits: 954 |
| | Here are a couple of things i have done in the past. 1) Use an aeration system to keep the lime in suspension. Use a small blower external to the tank and PVC pipe with holes in the bottom of the tank. Depending on your tank shape etc you may get away with the pipe being open ended in the tank. Fill or substantially fill the tank before putting in the lime. 2) Reduce your slurry conentration. 3) Clean out your tanks regularly . 4) Use softened water for your slurry make up (You may not have the quantities of softened water available). If you don't have soft water use water with the lowest "hardness" available as this will reduce the amount of sludge you will get in the tank. 5) Use alternative chemicals such as soda ash . You can clean your pump lines etc with dilute HCl acid but i belive that a strong hypochlorite solution will also work. Regards terryf |
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| | | Forum Guru
Group: Forum Members
Last Login: 3/20/2009 12:00:08 PM
Posts: 54, Visits: 51 |
| | The only pumps that have given me robust, low maintenance service for lime slurry duty are peristaltic hose pumps. |
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Supreme Being
Group: Forum Members
Last Login: 6/24/2009 4:01:52 PM
Posts: 284, Visits: 815 |
| | Hypochlorite has a very high pH and I don't think it would dissolve the calcium carbonate scale. The lime is providing calcium, softening the dilution water to remove calcium may not reduce scaling. It would in a system like hypo dilution where calcium from the dilution water causes scale formation due to CO2 and the high pH. Adding air may add CO2 and form calcium carbonate scale. If you drop some of the scale into dilute hydrochloric acid and it fizzes it is a carbonate. |
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| | | Forum Newbie
Group: Forum Members
Last Login: 7/1/2009 1:55:02 PM
Posts: 2, Visits: 69 |
| | Thanks for the comments and ideas, they are appreciated! |
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