I was on-site STP monitoring with the STP coordinator En. Retzuan on September 27, 2020, to get a full hands-on learning experience on water sampling. This exposure greatly improves my understanding of environmental literacy and also provides data on the Intermittently Decanted Extended Aeration (EA) log sheet for daily monitoring. Bp Food Testing Sdn Bhd's sampler came to Hospital Permai STP once a week as the Population Equivalent (PE) exceeded 5000.
At first, he will take an influent raw sewage water sample for temperature and pH testing at the primary screening chamber.
Figure 1 Influent water sample
This is the device used for thermometer check,
Figure 2 Infrared Thermometer Laser-point
The equipment used for pH test by the sampler company is called a photometer. Later, a specialized tablet reagent will be used to dissolve together with the influent raw sewage water.
Figure 3 Process of dissolving tablet reagent for pH test
Figure 4 Water Sample for pH parameter
This is the result recorded for influent water with pH = 7.24
Figure 5 Photometer with influent water
Later the effluent water also being sampling and the pH test result showing the final treated pH value of 7.21
Figure 5 Final effluent sampling with pH result
Thus, it is considered acceptable results as the normal standard sewage water have a pH range of 6.5-8.4. In the end, the sampler will label each container with an influent and effluent water sample taken and proceed to the lab for other parameter checks.
Figure 6 Labelling the container