Lots of things done, spent 1 full day on sampling and testing:
- 2 - 4 pm: Installed fittings & Data Logger
- 4 - 10 pm: Through testing of digestor concentrations
- 10 - 11 pm: Packing up
Eng Guan ran out of stock for the 3/8" nipple and N-cap (backwash valves); but the rest of the fittings were completed:
This was how the sight glass containing 12 vol% cow dung looked like - very well-mixed, we should expect some good results from the testing:
Spray paint can do wonders, don't they?
Everything was in a total mess when we were doing testing - we really need a cabinet for storing all these expensive equipment and chemicals:
From Left: Mr Kon's Weighing Balance & Colorimeter (Hach), Ms Yang's Photometer (WTW) and Mr Ting's Photometer (Hach); a combination of these 3 concentration analysis devices made thorough sampling possible:
The very much sought-after thermoreactor (COD reactor):
Brenda's doing the serial dilution; it's pathetic to use a syringe to measure 1ml of chemicals, etc - we need a micro-pipette:
The Sulphate Test - Basis for High H2S output:
2 layers of precipitate and solution was observed. Subsequently, cuvett was inserted into photometer for sulphate analysis:
Look at the sky, it's pitch-black!!!
Time check: 10.47 pm!!!
Totally exhausted, but well worth the effort as test results fell within expected range. Some analysis that the past batches did not conduct for orange digestor include:
- Suspended Solids: 1270 mg/L
- Turbidity: 1640 fau (with 10 fold dilution)
- TOC: 110 mg/L
- D.O: 1.34 mg/L
- Sulphate: 87 mg/L
- pH: 7.7
In the future, to do:
- TOC & COD tests first as they require 2hrs heating
- Loan out Micro-pipettes from Mr Yeo
- Loan out pH meter from Mr Yeo
- Ask for Cabinet with lock from uncle Chris
- Return Weighing Balance & Trolley to Mdm Tan
- Buy Kang Kong/ Alifafa Seeds
Kian How, signing off on 21/11/10, 2.15pm
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