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- #541
Damned .... you sound like a scientist. I'm puzzled why anyone would even know all that unless they're in that line of work or prepping for Jeopardy .... LOL. Kind of reminds me of when I was a teenager reading "The Book of Useless Knowledge". Not saying it's useless to all. But most people wouldn't know any of that stuff off hand & would have to research it.Yes. Water suppliers do put stuff in their supply for several reasons. They will use chlorine naturally, for disinfection and sometimes they get it a little hot due to a recent pipe line repair where outside water invaded the inside of the pipes. Yes it happens all the time during repairs. That’s why we see sand and grit too. When treating water we also use coagulants to settle out “floaties” and suspended particles. A popular one is Ferric sulfate. It’s rusty red looking liquid that is used in small injected quantity during the treatment process to settle out and suspended stuff. That usually settles out into the bottom of a large clarifier and the sludge created is drawn out from the bottom of the stilling well/sump area of the clarifier. This polishes up the visual clarity and the actual quality of the water and removes most suspended organic particles. We also use liquid polymers. They basically do the same thing. There are several different types and do just as good a job. But you don’t usually see polymers being used in potable water treatment, just wastewater treatment as there’s way more “solids” to remove. The bad news is that Chlorine is still in use in many wastewater plants in this country. But they use Sulfer Dioxide to neutralize the chlorine before finally leaving the plant and entering the effluent stream. Usually the level must be less than 0.10ppm to enter an effluent stream or body of water. But in potable water, I’ve seen an average of 2.00ppm-5.5+ppm in potable water. Ive also experienced PHs of 9.0+ in potable water. My average tap water here at the farm always runs hot on PH 8.5+ and Chlorine 2.3-5.0+ppm. If you can smell the chlorine to the point it reminds you of a swimming pool, it’s hot. Probably over a 2.5ppm. Chlorine can’t be good for a plant when it’s hotter than 5.0ppm. However, I can’t say that I’ve seen grass or weeds die because the water being applied to it had too much chlorine in it. At my facility, we’ve had water overflows where the chlorine dose was over a 5.0ppm. The plant life in the area simply didn’t care. But it was such a large area and the weather was warm so the chlorine dissipated relatively quickly. The solution to pollution is dilution. Just remember that.
PS I forgot to tell you the good news. Many wastewater treatment plants are switching from chlorine and sulfur dioxide disinfection processes, to much safer ultraviolet light disinfection. Huge channels with large banks of ultraviolet light bulbs sometimes 6 feet long in rows of 20 banks of 30 or 40 bulbs of very powerful ultraviolet light that kills and sterilizes anything that passes through the channel. Yes. We have to wear PPE to be around these systems. And if you think your light bulbs for growing are expensive cheer up. Just one of our light bulbs costs anywhere from $80- $120 A PIECE. And they burn out all the time. Or one of our employees decides to drop or step on one. Anyway. Just thought you guys would like to know a little about your potable water and the methods used to treat that water and the wastewater that you generate every day down your drains to the wastewater collections systems. (Sewers).