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| |  Posted 1/18/2008 7:51:56 PM | |
| Forum Newbie
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| | Hello, I am the Chief Operator at a small RBC/Aerated Lagoon facility and we direct discharge our effluent into a river. Our average daily flow is .080 mgd, with an occassional max flow of .200 mgd. We currently use liquid hypochlorite to chlorinate and sodium bisulfite to dechlorinate. I am researching the possibility of switching to eilther a tablet or pellet type chlorinator. Any advice, suggestions, comments or recommendations would be greatly appreciated. Thanks, John |
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| | | Posted 1/21/2008 12:57:49 PM | |
| Supreme Being
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Last Login: 6/18/2008 10:17:32 AM
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| | Have used the tablet feeders not sure of the name brand. The tablets tend to get hung up in the tubes, so you have check them daily. It seems hard to keep a consistent cl2 residual with them. |
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| | | Posted 1/21/2008 1:30:39 PM | |
| Supreme Being
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| | Ditto. Stick with the liquid. The tablet holders will clog with slime and debris, allowing the tablets to hang up. Small package pl ants that have no de-chlorination seem to work okay, if you check them daily. |
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| | | Posted 1/22/2008 1:00:03 PM | |
| Supreme Being
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| | The tablet feed systems have been used around here a fair amount. The sticking in the tube has been a problem (apparently, the tablets tend to swell up in damp conditions), but work well enough if the tubes are cleaned regularly. Best application has been with summer camps, etc., where getting maintenance people to do daily chlorine is always a problem. Many of the camps I deal with discharge to trout streams, and the old standard was a crock of hypochlorite, with a drip feed. this would result in wild swings in residual, depending on flow. The tablets have been useful for those types of situations. |
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| | | Posted 1/23/2008 2:08:19 AM | |
| Junior Member
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| | I agree with tablet chlorinator problems. Also the residual is highly variable (low at low flows and high at high flows). Also the hang-up problem. I would stick with sodium hypochlorite dosing. There are some things you should know. The dosing pump needs to be sized for the doserate. Do not operate much lower than about 40 % stroke size and have a fair dose rate at all times including low flows. Otherwise the oxygen gas will accumulate in the head and will not go until higher flows and pump rates. Is you hypo tank shaded from the sun? You should flow pace your dose rate. This can be done by LMI/Prominent/etc. Otherwise you can rig up a run signal from your outfall pumps, to give flow pacing. Also there are some companies offering degassing pump heads, which should overcome the gassing problem.
Regards
Grant H, Australia |
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