Ground water that does not need to be treated for turbidity still needs to be disinfected with Chlorine before it can be distributed to a community. This Chemical Dose Controller is designed to be a low maintenance, long term solution for chemically treating low turbidity ground water. The system uses a technology invented by the AguaClara program at Cornell University to automate chlorine dosing without electricity (once the water reaches the treatment unit). The system relies on a Linear Flow Orifice Meter (LFOM) to linearly correlate a variable flow rate with the adequate chlorine dose. As the LFOM varies the water level linearly in the entrance tank, a float attached to one side of a lever arm correlates the flow rate with a dosing tube attached to the other end of the lever arm. An appropriate Chlorine dose then drips from the dosing tube into the influent water where it can be dispatched immediately to a community distribution system, or sent to a storage tank.
To deliver water to the treatment unit, the team proposes the use of solar pumps. These solar pumps would most likely draw from shallow wells that are free of heavy metal or flouride contaminants, but may also be used with surface water sources with turbidity below 5 NTU. This unit will require minimal oversight by a community plant operator who may need to check on the doser once per day. The operator will be responsible for maintaining the correct chlorine dose and cleaning the unit as necessary using the vinegar valve to purge the system. The dosing design will be scalable to fit varying community sizes. Fabrication of the system can be done locally using readily available materials (aluminum frame, pvc pipe, drum stock tank, lever arm).