Automatic chlorine
dispenser at municipal level
Automatic chlorine dispenser at
municipal level
Introduction
• Water is essential, but there is a water crisis in the global
setting. Recent statistics show that approximately 785 million
people globally lack access to clean drinking water (World
Health Organization [WHO], 2019). It is further estimated that
by 2025 half of the global population will be residing in waterstressed areas (WHO, 2019).
Introduction
• Because of this demand and supply instability, people try
to solve the problem of water unavailability in different
ways hence preserving water in reservoirs, dams, or
tanks. Poor water management has resulted in water
shortage and lack of proper disinfection which may result
in health risk, wastage of chlorine and shortage of contact
time. Given the importance of water, it is prudent to
design better ways of providing clean water to the
society.
• Disinfection reduces pathogenic microorganisms in water.
However the right amount of dose of chlorine must be added in
order to prevent health risks.
• One way to do this is to design an Automatic chlorine dispenser
at municipal level using linear Chemical Dose Controller(CDC)
system.
Objective
• To design an automatic chlorine dispenser. So the design
requirements of this project entail what the automatic chlorine
dispenser needs to do.
Methodology
• Start at the Constant Head Tank (CHT).
The stock tank feeds into the CHT, and
the float valve makes sure that the water
level in the constant head tank is always
the same.
• The tube connected to the bottom of the
CHT is large diameter to minimize any
head loss through it. The three thin,
straight tubes are designed to generate a
lot of major losses and to minimize any
minor losses
• The large-diameter tube on the right of the three
thin, straight tubes is where the chemicals flow
out. The end of the tube is connected to both a
slider and a ‘drop tube.’
• The drop tube allows for supercritical flow of the
chemical leaving the dosing tubes; once the
chemical enters the drop tube it falls freely and
no longer affects the CDC system.
• The slider rests on a lever. This lever is the critical
part of the CDC, it connects the water level in the
entrance tank, which is adjusted by the LFOM, to the
difference in head between the CHT and the end of
the dosing tube. This allows the flow of chemicals to
automatically adjust to a change in the plant flow
rate, maintaining a constant dose in the plant water.
One end of the lever tracks the water level in the
entrance tank by using a float. The counterweight on
the other side of the lever is to make sure the float
‘floats,’ since this float is usually made of PVC, which
is more dense than water.
• The slider itself controls the dose of
chemicals. For any given plant flow rate,
the slider can be adjusted to increase or
decrease the amount of chemical flowing
through the plant.
Budget