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Results and Discussion
Outline:
1. Construction according design
2. Sieving process
a. Labor Intensive
b. Time consuming
c. Actual sand used << total volume*take note of % of sand source used
3. Washing process
a. Done to remove lighter particles which dissolve into water
b. Multiple cycles until it was clear
c. Multiple repetitions did not ensure fully cleaned water
4. Gravel issue
a. Sand passed through gravel
b. Output water: sand suspensions
c. Sand caked around gravel
d. The sand placed in bucket went out
5. Coarse sand replaced gravel bed
a. Sand no longer flowed out
b. Only water flowed
c. Water was turbid
6. Flow rate
a. Additional holes in drain pipe (did not work)
b. Sand was limiting factor
c. Slow flow rate compared to ideal based on Tarsi, 2014
d. Water input eventually became dirty and oily
7. Additional filter
a. Environment caused water input in initial storage to become oily
b. Oily and dirty water discouraged consistent flowrate
c. Cloth was placed between storage and filter pipe
8. Cloth issues
a. Cloth successfully increased flow rate
RESULTS
Design of First Flush Device
Preliminary Testing of First Flush Device
Figure 1. Original Design by Arkitrek, 2013
Figure 2. Edited Design based from Arkitrek, 2013
The table below is a record of the amount of water was diverted by the edited first flush
device. The data proved the efficiency of the diversion component of the first flush device.
Table 1. Pre-testing of First Flush Device
Amount of Water Diverted by FFD
Trial 1 Trial 2 Trial 3
Input
Output
Amount Diverted
Ave. Amount Diverted
Preliminary Testing of Slow Sand Filter
Table 2. Logged flowrates during pre-testing period
Date Time Flowrate (L / h) Comments
11/01/14 18:00 7.5
11/02/14 8:00 6
11/02/14 14:30 10.5
11/02/14 17:30 10.5
11/02/14 20:45 1 drop / sec*11.25**10.5***
* with dirty cloth**without dirty cloth*** after cleaning cloth
11/03/14 20:00 0*6.35**
*with dirty cloth**after cleaning cloth
11/04/14 6:30 8
11/04/14 19:30 2.73*9.39**
*unwashed cloth**washed cloth
11/05/14 18:00 1 drop/sec*14.4**
*unwashed cloth**washed cloth
11/06/14 6:30 1 drop/sec*14.4**
*unwashed cloth**washed cloth
11/06/14 18:00 7.2
11/07/14 6:30 3 drops/sec*14.4**
*unwashed cloth**washed cloth
11/08/14 10:00 1 drop/sec*14.4**
*unwashed**washed
11/9/14 9:30 14.4** **washed cloth
11/9/14 19:00 14.4** **washed cloth
11/10/14 6:45 14.4** **washed cloth
11/10/14 18:30 14.4** **washed cloth
11/1/2014 18:00
11/2/2014 14:30
11/2/2014 20:45
11/4/2014 6:30
11/5/2014 18:00
11/6/2014 18:00
11/8/2014 10:00
11/10/2014 6:4502468
10121416
Flowrate (L/hr)
Flowrate (L/hr)
Figure 3. Summary of logged flowrates
Figure 4. Dirt collected by FFD after a rainfall event
Figure 5. Dirt settled at the bottom of FFD after a rainfall event
Figure 6. Dirt accumulated on cloth after a day
Figure 7. Cloth after a few days
Water Testing
Table 3. Results of water test after one week
Microbiological Analysis (After First Week)
Influent Effluent Point of Use
Total Coliform (MPN / 100mL) 2.1 Less than 1.1 -
Fecal Coliform (MPN / 100mL) Less than 1.1 Less than 1.1 -
HPC (CFU / mL) >3000 >2000 -
Bibliography
United States Environmental Protection Agency. (2013). Air pollution and water quality. Retrieved from http://water.epa.gov/lawsregs/lawsguidance/cwa/tmdl/airdeposition_index.cfm
DISCUSSION
