The gathering of wastewater samples, which is a necessary step of wastewater treatment, demands a lot of care. This is as the successful treatment of the water, or otherwise, impacts the lives of lots of living organisms and the environment. This article discusses five crucial steps that you must never ignore while you are collecting samples. The steps begin from the preparation of the source from which the sampling will be undertaken right through to the final step of getting the samples to where they will be tested.
- You must exercise great care during the sampling of wastewater as it will eventually end up being the representative of the water to be tested. This is to effectively prevent the sample from being contaminated at the time that it is being collected and through the time before it is examined.
- When samples of wastewater are collected from a running tap, then tap has to be fully opened and the water must be allowed to run waste for between three and five minutes, or for any length of time that is enough to allow for the complete cleaning of the service line. After that, the flow that is coming from the tap should then be restricted to the kind of flow that will enable the collection bottle to be filled without any splashing. You must make sure that you avoid taps that are leaking when seeking a point from which to collect wastewater samples. This because such sources of samples could end up making you obtain incorrect results from the wastewater treatment plant that will test the sample.
- When you collect any samples from a tap and you feel that the tap is unclean, then you should make sure that you apply sodium hydrochloride (about100 mg NaOCl/l) to the tap’s faucet and allow water to run from the tap for between two and three minutes before you then go on to collect the sample.
- When you are collecting your sample from a stream, reservoir, shallow well, river, lake, or spring, the location that you have chosen for the sampling of wastewater has to be as close to the draw-off point as is possible. There is a stipulated level of nearness that has to be in existence between the draw-off point and the location for the sampling to be effective.
- If you are going to collect your wastewater sample from a well that is fitted with a hand pump, you should make sure that you pump water to waste for around five minutes before you then go on to collect the sample. If it is a mechanical pump that the well is equipped with, the sample can be collected from the discharge of a tap. If the well does not feature any pumping machinery at all, the sample could then be collected by lowering a bottle that is sterilized (it should have a weight fitted to its base) into the well.
In conclusion, these are the five foremost steps that you must follow to achieve a perfect sampling of wastewater. The success of the collection of the sample is what eventually impacts the success of wastewater treatment. So, use these steps.