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Questions tagged [water-treatment]

Questions about any process which makes water more acceptable for an end use.

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Making hard water

Does anyone know how to make hard water with a hardness of 200+ ppm in terms of $\ce{CaCO3}$? I live in Seattle and we have very soft water and we need hard water for testing purposes. Obviously you ...
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1answer
29 views

How can I reduce sodium chloride levels in water, without removing other minerals?

How can I reduce sodium chloride levels in water, without removing other minerals? Good day, I make a sole from Himalayan Salt which I add to my Reverse Osmosis treated water to ensure my body isn't ...
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1answer
25 views

Is it stupid to put used acid into a pool after cleaning the chlorinator? [closed]

I have a salt pool, and when the chlorinator salts up with calcium, I clean it with a diluted acidic solution. What happens to the acidic solution after the reaction happens? I.e., does the pH change?...
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how can I predict the rate of water ions precipitation on a surface?

Consider a titanium pot that contains 1kg water with the following ions: $[Ca^{2+}]=22000$ ppm, $[Mg^{2+}]=1500$ ppm,$[Sr^{2+}]=791$ ppm,$[Na^{1+}]=48000$ ppm,$[Cl^{1-}]=120000$ ppm,$[SO_4^{2-}]=...
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2answers
67 views

Waste water treatment [closed]

This is a very simple question: Why are oxidized compounds generally thought to be less toxic/polluting than reduced species? This is used in waste water treatment where oxidizing agents (such as ...
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2answers
76 views

Why we don't we save water by boiling the contaminated water to get the pure steam?

I see lot of drinkable water wasted in household and industrial activities, water usually gets contaminated with detergents(and other household materials),chemical effluents released from factories . ...
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1answer
299 views

How does chlorine in water evaporate?

Drinking water (e.g. from your home's tap) is spiked with chlorine, for an amount of just some ppm. Purpose of this operation is to kill bacteria, for our health. Background: chlorine in water is ...
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2answers
601 views

The effect of pH and solubility on coagulation in water treatment

In water treatment, a specific pH range must be met in order for the process of coagulation to occur properly. Sources have stated this is due to the pH affecting the solubility of the coagulant, but ...
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1answer
67 views

How does the water pollutant sodium nitrate affect the concentrations of other ions in tap (dam) water? [closed]

Context In my assignment I've been given two water samples from the hinze dam. The first sample has been untouched, however the second has been contaminated with an unknown ionic compound. To ...
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1answer
45 views

Biological contamination from ground

I took samples of tapwater in order to examine concentrations of Escherichia coli and enterococcus in a rural area. I was told, from an analytical lab, to take samples in four sterilized vessels ...
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1answer
49 views

Is Reverse Osmosis Sanitizer safe to use? [closed]

The Sanitizer is called Sani-System (For Reverse Osmosis). The purpose is to get rid of the bacteria within a Reverse Osmosis system (Priority is the tank: that holds the water) -- edit Safe meaning ...
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0answers
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Amount dry acid or sodium bisulphate needed for varying hardness values [closed]

My question is regarding the use of sodium bisulphate to lower the hardness of water. I am attempting to come up with a label to let consumers know how much product (dry acid or sodium bisulphate) is ...
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2answers
378 views

Water cooling by evaporation

For many years of drinking water has been cooled in hot climates by evaporating it from the surfaces of canvas bags or porous clay pots. How many grams of water can be cooled from $\pu{35 ^\circ C}$ ...
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1answer
135 views

How does Ozone disinfect water? [closed]

How does ozone remove the impurities in water? I know that there is a process which some European countries use water purification systems based on ozone. It would be beneficial if you could provide ...
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1answer
78 views

What are the ways to make radioactive water drinkable again? [closed]

Let's say survivors in the area contaminated by radioactive fallout need to somehow process the water from rivers, rain or pipes. How could they go about it? Is it even possible to 'remove ...
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1answer
232 views

Can iodine be used to disinfect water?

I think it was Nat Geo.. Not sure exactly.. Where I heard, years ago, that a drop of iodine can be used to disinfect water of say, 1 litre. But isn't chlorine used to kill all bacteria? I mean I don'...
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285 views

Which is more likely to form: silver chloride or silver phosphate?

If silver nitrate is added to an aqueous solution (such as tap water) that contains both chloride ions and phosphate ions, which precipitate is more likely to form: silver chloride, silver phosphate ...
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2answers
134 views

Remove only salt from salt water

I have a bottle of salt water I collected on a local beach. I want to see what is in it, apart from water and salt. If I boil the whole bottle and wait for it to evaporate, mostly salt will remain. I ...
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Magnetic Water Softener

I've been asked to install some kind of technology to a building with 40 rooms to soften the water. Browsing through the product catalog I found this so called "Magnetic Water Softener", however ...
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0answers
520 views

Does adding slices of lemons to water reduce its chlorine content?

Often restaurants add slices of lemon to water. They seem to make the water taste better and perhaps reduce or at least cover up the chlorine taste. I've heard that Vitamin C tablets can be used to ...
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1answer
235 views

Can Aquatabs be used to clean swimming pool water?

Can Aquatabs be used to prepare/chlorinate water for swimming? They are used to clean water for drinking so is it safe to assume that if used in proper quantity they can also clean water for ...
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1answer
129 views

What happens with ammonia ions in tap water after they are separated from chlorine?

Tap water is increasingly treated with chloramine which is composition of chlorine and ammonia. Chlorine can be removed by catalytic activated carbon and ammonia ions are then left. What happens with ...
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1answer
458 views

How to effectively remove chloramine from tap water

I am looking for a way to remove or substantially reduce chloramine from tap water. From what I learned chloramine is created when ammonia is added to chlorinated water. It is now a method of choice ...
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1answer
242 views

DIY spectrometers limits as a water quality sensor

What pathogens or harmful stuff IN WATER can you detect with these homemade video spectrometers (webcam) + UV light? https://www.youtube.com/watch?v=IA5BTD-aelo I'm trying to do a cheap spectral ...
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202 views

Cheap spectral analysis to analyze water quality

I need some guide about spectrometers I saw a lot of DIY spectrometers to analyze light. Does anyone try to use those DIY spectrometers to analyze water? To detect heavy metals? or a chemical? or ...
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0answers
46 views

Is it a good idea to build a small scale ozone AOP reactor in my garage?

I have some interesting findings from my work (no conflict of interest), and I have been thinking to build an ozone lab in my garage to verify my ideas. What safety issues should I be aware of? The ...
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2answers
590 views

Calculate hardness of water

A sample of water has its hardness due to only $\ce{CaSO4}$. When this water is passed through on anion exchange resin, $\ce{SO4^2-}$, the $\ce{SO}$ ions are replaced by $\ce{OH-}$. A 25.0 mL sample ...
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1answer
157 views

How do I convert this ion exchange capacity into water softening capacity?

I am researching for an extended experimental investigation into methods of water softening. One such method is the use of ion exchange resin. I have contacted the supplier of the resin for its ...
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0answers
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Creating Floc in the classroom

I'm the youth ed manager at Denver Water in Colorado. We do a water treatment demo in the classroom, and currently we use the first part of the Winkler DO test to create floc. I'm looking for a better ...
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1answer
54 views

How do I turn room temperature water into boiling water for drinking using an chemical/additive?

I am trying to create instant boiling water using a chemical of sorts, so that it can be consumed by a human. For example; someone could make tea without a kettle or any available water heating ...
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3answers
3k views

Filtration methods at removing ions present in water

I'm doing a lab where I have to first find out what ions are present in the water (easy part). The next part is to filter out those ions from the water. Here are some methods that are stated on the ...
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1answer
202 views

What is this device? (Constant level device?)

Found this in my lab on a random shelf (water quality lab). It is old enough that nobody knows where it came from. I think it's a constant level device. It has in- and out-flow connections, as well as ...
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1answer
2k views

Does UV water purification cause cancer? [closed]

I found out that a relative is using a machine that performs UV water purification at home (for drinking). There seems to be a distinct difference from the water that is not purified by it. Is it ...
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1answer
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Do minerals and/or metals found in water tend to settle to the bottom?

I was reading an article that suggested that if one lets water sit for a day in a bottle or pot, then some of the metals in the water, such as lead, will settle to the bottom. Does anyone know if ...
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1answer
89 views

Determining the amount of water to create a given pressure in a sealed container

I have a sealed container with a volume of 1 liter. I want to go from an initial pressure of $P_{1}=1\ \mathrm{atm}$ and an initial temperature of $T_{1}=298\ \mathrm{K}$ to a final pressure of $P_{2}=...
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2answers
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Is there a treatment for distilled water become drinkable? [closed]

It is my understanding that, drinking distilled water may not be recommended. Its not recommended indeed. Or maybe its not not recommended... Maybe not not indeed........ Anyway.... Well, apparently, ...
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1answer
2k views

What are the effects of storing drinking water in a copper container?

I recently learned that Ayurveda recommends storing drinking water in copper containers for positive health benefits. Upon my simple experimentation, I've noticed the following effects: Water Type :...
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1answer
78 views

Biologically inert water mixture (or other fluid) for heat-exchange purposes

I have a steel chamber submerged in a 14 deg water bath to keep it at constant temperature. The setup needs to operate without intervention for a very long time (weeks or months). The bath is ...
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1answer
1k views

Can I add citric acid to KCl for iron removal in a water softener?

I recently installed a water softener and having a fair amount of clear iron in our water, I've been using Morton Rust Remover pellets which are basically NaCl with citric acid added as an additive. ...
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1answer
82 views

What chemicals cause the softer less-raw taste of purified water sold in bottles/cans?

I've seen this post, but it doesn't answer my question. I took water that is supplied by the municipality corporation and put it through a gravity based water filter. The taste of the water didn't ...
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1answer
5k views

Why does my filtered water turn thick and almost slimy when refrigerated?

I just started using a water filter. I have 2 containers to store the filtered water; one goes in the fridge and the other stays out on the filter. The water that stays out is fine and stays good ...
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3answers
192 views

Does boiling water really treat it to make it safer than filtered/chlorinated water?

It doesn't seem like it would, but some folks I know are adamant about boiling their water before ingesting it and the online articles I've found on this seem very subjective.
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Is it safe to drink reboiled water?

There have been some claims saying that drinking reboiled water is dangerous because it produces arsenic, nitrates, etc. Is this true?
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1answer
338 views

What does ozone smell when treating with household water?

We live in a rural area and our well water comes from storage tanks that are continously being ozonated before passing through an infra red lamp. The water in the house smells like it contains ...
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1answer
161 views

Is there a chemical treatment for pipes to reduce or eliminate leaching of lead into tap water?

Given events in Flint, Michigan, where a switch to acidic river water in the city water supply resulted in leaching of lead into tap water from the insides of pipes, I wonder -- has anyone has heard ...
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1answer
183 views

Does oxygenating tap water remove the tap water flavor?

I know flavor is subjective and not exactly quantifiable, but I think there's merit to this question. We've all experienced that tap water often tastes a lot worse than bottled water or filtered ...
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1answer
161 views

Quality of water for drinking purposes

As I’m reading about water cations and anions, I read that the benefits we gain from water are of course lots, but the most important of them is the neutralisation of acids ($\ce{H+}$) from the anions ...
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The Health Effects of Alkaline Ionized Water?

I came across alkaline ionized water as my aunts bought a system called Kangen Water from Enagic Inc. The water produced by this system is claimed to contain smaller water clusters (4-6 molecules) ...
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1answer
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Test for chlorine and chloramine in city water supply

I am looking to install a water filter system and I wanted to test the water for free and total chlorine. I understand from the city water report that it uses chloramine and NO chlorine (test report)...
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1answer
164 views

Boiling aluminum in high-alkalinity water

This question ultimately relates to brewing beer, but more specifically to water treatment before brewing. Though I can't get a water quality report, I suspect I have high levels of bicarbonate ...