5th Aerobic Sampling (Day 4) on 17 December 2010 (Friday)

 
We encountered some hip-cups with the compressed air cylinder today. The air supply ran out and we had to replace it with another cylinder.

Thanks Mr Kon for delivering the HACH chemicals yesterday; we had just used up the TOC reagents from WTW. We'll be returning Ms Yang's Photometer to W316.


This is the new TOC test kit (HACH) - before reaction:

The TOC Cells - after reaction; the actual colour when we were on-site were from left, bright yellow, pink and purple:

The Nitrate Test (to evaluate fertiliser efficiency):

  

The below shows the potted plants' growth  progress on Day 4:

 

Kang Kong's Growth Progress:

 

Alfalfa's Growth Progress:

Green Beans' Growth Progress:

Results and Findings:

Apparently, the fertilisers from our grey and orange digestors are working better than the commercial one.

Most importantly, we have another set of breakthrough test results today!! The COD for both digestors fell to "0".

The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. It determines the amount of organic pollutants found in water, making COD a useful measure of water quality.

With a "0" COD value, the effect of the aerobic stages' efficiency on pathogen destruction is manifested. This also indicates a very low pollutant level, which makes a requisite for good fertilisers.



 Kian How, signing off on 17/12/10, 11pm.