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Surface discharge from individual on-site systems is illegal in Indiana. Therefore, tablet chlorinators are not needed for individual homes. (Wastewater will go to a subsurface absorption system.)
Man-hours per individual tablet chlorination unit:
Man-hours per cluster tablet chlorination unit:
Parts and Supplies:
| 8 lb. available chlorine/home/year | $3.00/lb. available chlorine |
Equipment:
| Brush | $ 5/1 yr. |
| Gloves | $ 6/1 yr. |
| Garden hose | $20/2 yrs |
| Chlorine test kit | $54/5 yrs |
| Total: | $32/1 yr. |
Power: none
| Labor: | |||
| individual units | 6 man-hrs/unit * $10/man-hr * 30 units / 60 homes = | $30.00 | |
| cluster units | 10 man-hrs/unit * $10/man-hr * 1 units / 60 homes = | $ 1.67 | |
| Chlorine: | 8 lbs. available chlorine * $3/lb. available chlorine = | $24.00 | |
| Equipment: | $32.00 / 60 homes = | $ 0.53 | |
| Vehicle: | no additional mileage = | $ 0.00 | |
| Total: | (First Quarter 1982) | = | $56.20 |
| Updated Total: | Total | OMR | 1982 OMR | |
| $56.20 | 3.49 | / 3.49 | $57.02 |
Tablet chlorinators are used for treatment of surface discharge from aerobic or sand filter. Tablet chlorinators are simple and relatively inexpensive to install. O&M requirements are comparable to those of the chlorine solution feeder systems (Vogel. 1982).
Tablet chlorine is typically two or three times as expensive as the liquid or granular forms. These units are described by EPA (1980c).
A problem often encountered with these units is caking of the tablets due to moisture absorption. This prevents the tablets from dropping freely. Also, changes in flow necessitate varying the number of tubes which stocked.
Solids will accumulate in the contact chamber.
Tablet chlorinators must be restocked as necessary, cleaned periodically of solids accumulation, monitored and adjusted for correct residual in the effluent. Six man-hours for single home units and 10 man-hours for multiple units should be allowed per year.
Chlorine consumption can vary from 2 to 17 lbs. of available chlorine per home per year. Chlorine tablets contains 70 to 90% available chlorine. An average cost of $24 per home per year was obtained from local hardware supplier prices and from Boyle and Otis (1979). However, the cost to an individual home could be as high as $60.
Since chlorine is a significant expense, the results for this system are especially applicable where more homes are involved. The example shows costs for a community of 30 single-home units and one unit servicing a group of 30 additional homes.