3rd Anaerobic Sampling (Day 7) on 26th November 2010 (Friday)

Firstly, I wasn't at the farm today, but a zillion thanks to Brenda for her brilliant job and for updating me!!!

This girl just amazed me at how "horribly" neat she can get, even though this is not usually the case...

Visually, something didn't seem right with the grey digestor sight glass. If it is truly anaerobic condition, why would alage/ mould grow on the tip of the sight glass?
 

The overview of the sight glass (a well-mixed slurry):

The bottom of the sight glass seems unusually red:

If you were to compare the grey digestor sample (Left) & Orange Digestor (Right), the orange sample seems physically clearer, even though the sample has a higher turbidity and suspended solids concentration. It's not very apparent in the photograph though.

Result of COD Test, after 2-hour reaction time.
From Left: Blank, Grey Digestor, Orange Digestor:

 

Result of Phosphate Tests (From Left: Grey, Orange Digestor):

As for Nitrate Tests, you may observe a brown liquid layer floating on top of a transparent layer:

TOC tests before reaction (colour is blue):

TOC Test, during reaction in the thermo-reactor (colour changes from blue to brown):

Result of TOC Tests (From left: Grey, Orange Digestor):

Conclusion of Tests:

We have very good results to show - results are showing an expected trend as per hypothesized, with the only exception that COD in Grey digestor increases from Day 5 to 7. A higher COD would mean a poorer waste treatment efficiency.

Digestors are functioning as per normal, with the orange digestor generally showing a better performance than grey digestor. Further analysis would be addressed in report.

Next test would commence on 1st December 2010 (Wednesday).



Kian How, signing off on 26/11/10, 11.10 pm.