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cerrar este libroFact Sheets on Environmental Sanitation (WHO; 1996; 328 pages) Ver el documento en el formato PDF
Ver el documentoPresentation
cerrar esta carpetaIntroduction to fact sheets on water
Ver el documentoFact Sheet 2.1: Sanitary inspections
Ver el documentoFact Sheet 2.2: Dug well
Ver el documentoFact Sheet 2.3: Boreholes and tubewells
Ver el documentoFact Sheet 2.4: Springs
Ver el documentoFact Sheet 2.5: Infiltration Galleries
Ver el documentoFact Sheet 2.6: Rainwater collection
Ver el documentoFact Sheet 2.7: Surface water abstraction
Ver el documentoFact Sheet 2.8: Water treatment
Ver el documentoFact Sheet 2.9: Flow measurement and control
Ver el documentoFact Sheet 2.10: Simple sedimentation
Ver el documentoFact Sheet 2.11: Pre-filtration
Ver el documentoFact Sheet 2.12: Slow sand filtration
Ver el documentoFact Sheet 2.13: Coagulation, flocculation and clarification
Ver el documentoFact Sheet 2.14: Rapid sand filtration
Ver el documentoFact Sheet 2.15: Storage tanks
Ver el documentoFact Sheet 2.16: Disinfectants
Ver el documentoFact Sheet 2.17: Chlorine concepts
Ver el documentoFact Sheet 2.18: Chlorine gas or liquid in cylinders
Ver el documentoFact Sheet 2.19: Calcium hypochlorite
Ver el documentoFact Sheet 2.20: Sodium hypoclorite
Ver el documentoFact Sheet 2.21: Continuous chlorination of dug wells
Ver el documentoFact Sheet 2.22: Dosing hypochlorite solutions
Ver el documentoFact Sheet 2.23: Dosing chlorine for cylinders
Ver el documentoFact Sheet 2.24: Hypochlorite tablet dosers
Ver el documentoFact Sheet 2.25: Cleaning and disinfection of wells
Ver el documentoFact Sheet 2.26: Cleaning and disinfection of storage tanks
Ver el documentoFact Sheet 2.27: Cleaning and disinfection of pipelines
Ver el documentoFact Sheet 2.28: Cleaning and disinfection of tanker trucks
Ver el documentoFact Sheet 2.29: Water quality monitoring
Ver el documentoFact Sheet 2.30: Chlorine monitoring at point sources and in piped distribution systems
Ver el documentoFact Sheet 2.31: Chlorine testing
Ver el documentoFact Sheet 2.32: Bacteriological testing
Ver el documentoFact Sheet 2.33: Turbidity measurement
Ver el documentoFact Sheet 2.34: Household water treatment and storage
abrir esta carpeta y ver su contenidoIntroduction to fact sheets on sanitation
abrir esta carpeta y ver su contenidoIntroduction to fact sheets on hygiene education
 

Fact Sheet 2.24: Hypochlorite tablet dosers

The simplest form of tablet chlorinator, shown in Figure 1, consists of a rectangular plastic container with an inlet baffle to spread the inflow across its width and a vertical slot at the other end forming the outflow. The container lid is pierced to take a vertical tube, slotted at the lower end, which stands on the floor of the container and holds a stack of tablets. Water flowing through the chamber dissolves the tablets. As this arrangement, if applied directly to the full flow, produces much higher dose rates than would normally be required, a by-pass system is needed to allow only a controlled proportion of flow to pass through the doser. This by-pass is the only control of dosing in a tablet doser; the unit itself is not adjustable.


Figure 1. Simple tablet chlorinator

Most box chlorinators are capable of a minimum dose of about 60 mg/l chlorine per minute and are therefore not appropriate for water flows of less than 3.6 m3/hour.

Operation and maintenance

Hypochlorite tablet dosers are often purchased from the suppliers of the tablets themselves. The manufacturers' guidelines regarding operation and maintenance should be followed. In general this will require:

• Regular, frequent topping up of the tablet reservoir.

• Regular, but less frequent, cleaning out of the apparatus and lines of accumulated precipitates, scale, and such like.

• Regular frequent monitoring of residual chlorine in the distribution network, and adjustment of the dose control on the vertical tube and by-pass system accordingly.

 

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