Flat Foam Sheet Experiments
Before designing a foam filtration system, it is necessary to test the filtering capacity and associated head loss of various pore sizes of foam.
Therefore, we set up the following schematic:
- Raw water flows from the distribution tank, into a holding reservoir. The holding reservoir is necessary as it allows air trapped in the water line to escape before sending it through the filter. Air cannot be allowed into the filter as it will alter the results of filter preformance.
- The water is then pumped into the top of the filtration apparatus, and down through the filters.
- The effluent water line continues to the turbidimeter where the effluent turbidity is measured.
Figure 1: Schematic of foam sheet experiment
Procedure for Maintenance of the Raw Water System
Every time your team uses the turbidity controlled raw water system, you should perform the following checks:
-Check to ensure the turbidimeter is clean and there is sufficient flow to the turbidimeter (you should be able to see water running past). If there is too much or not enough flow, first adjust the flow valve that delivers water to the recirculating system of tubes. If you must, then adjust the flow valve to the turbidimeter
-Check to ensure that the aeration stone is aerating and is connected to an air source. The aeration stone can force small bubbles and dissolved air out of solution before it comes into contact with your experimental apparatus.
-Ensure that the tap water system is turned on and is at a flow rate you wish.
-Put the appropriate concentration of clay in the concentrated clay stock. This will be determined by your target turbidity and the on-off controller time points that you set.
Experiments
Raw Water Turbidity Process
Multiple experiments were run with varying pore size in order to determine how pore size affects filtration preformance.