7. Total Suspended Solids Measurement

We will do total suspended solids in water. So what we are measuring really is Rho 32. We are measuring solids in water, we are not measuring chemical concentration, we are measuring solids concentration in water. So it is like this. You take a water sample. The water sample looks muddy, okay. It looks muddy, then you know that something is there in the water sample, yeah.

Total Suspended Solids (TSS) refers to the amount of solid particles that are suspended in water. When we look at a water sample, if it appears dirty or muddy, it indicates that there are solid particles present. In TSS measurements, our focus is on quantifying these particles, not on the chemical substances dissolved in the water. This distinction is crucial as it determines the methods we use for measurement.

Think of TSS like looking at a glass of juice. If the juice has pulp floating in it, it is similar to a muddy water sample. You can see the particles, and you want to know how much pulp is in the juice, just like you want to measure how much solid is in the water.

In order to measure the amount of this thing, so what we are actually measuring is m3 by volume of2, this is our measurement. So we would like to measure the solids that are suspended in this water sample, yeah. So, what is the simplest way to do this? You simply want to measure mass over volume.

To measure Total Suspended Solids, we need to calculate the mass of those solids and the volume of the water sample. The basic formula combines these two measurements: TSS = mass of solids (m3) / volume of the water sample (V2). This means we need to first determine how much solid material is present within a known volume of water.

Imagine you have a cup of gravel mixed with water. If you wanted to find out how much gravel is in the cup, you would weigh the gravel, figure out how much water is there, and then divide the weight of the gravel by the total volume of water. This is just like what we're doing with TSS measurement.

So, what do I need to do in order to measure the solids, suspended solids? Yeah, I need to filter. What am I doing when I am filtering? Separating the solids from the liquids.

The process of measuring TSS involves filtering the water sample to separate solid particles from the liquid. This entails passing the water through a filter that captures solids while allowing clean water to pass through. The solids collected on the filter paper are then weighed to determine how many are present in the sample.

Think about making coffee. When you use a coffee filter, the liquid coffee drips through the filter while leaving the coffee grounds behind. Similarly, in TSS measurement, the filter captures solid particles so that we can later weigh them.

Now, how do I measure the amount of solids here. I have separated it and the solids that are collected on the filter paper, I can I have to measure it. Now, I measure it using weighing balance.

Once the solids are trapped on the filter paper, the next step is to weigh them using a balance. The weight of the empty filter paper is first recorded, and then the weight of the filter containing the solids is measured. The difference between these two weights gives the mass of the suspended solids in the water sample.

Imagine you are baking. When you measure flour, you first weigh the empty bowl and then weigh the bowl with flour. The difference in weight tells you how much flour you have, just like measuring the difference in weight of the filter paper tells us how much solid is present.

Now, if I take a water sample that does not look brown, that does not look even like yellow, can I say that there are no suspended solids in it by this method? I mean I cannot say it unless I do this method, okay.

It's important to note that not all solids can be detected by visual inspection. Even if a water sample appears clear, it doesn't guarantee that there are no suspended solids present. The actual concentration might be below the detection limit of our measurement method, meaning that without conducting the test, we cannot confirm the absence of solids.

This is like checking for dust in the air. Just because you can't see it doesn't mean it isn't there. You might need a special instrument to detect small particles even if the air seems clear.

When you have signal like this, it is a distribution, you have a large distribution of signals, large number, and you have another distribution of noise.

In measurements, distinguishing between actual data (the signal) and background variations (the noise) is vital for accuracy. The signal-to-noise ratio helps us evaluate the reliability of a measured value. A high ratio indicates clear, reliable data, while a low ratio suggests that what we see might just be random fluctuations and not real measurements.

Think of trying to listen to music in a noisy environment. If the music (the signal) is much louder than the noise around you, you can enjoy it. If the noise is just as loud, you can’t tell if the music is playing, which is like having a low signal-to-noise ratio.

--