Skip to main content

Questions tagged [water-treatment]

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

Filter by
Sorted by
Tagged with
0 votes
1 answer
103 views

Activated charcoal for water filtration: Granules vs Pellets

NOTE: After further investigation into the producer I found out that granules are made of 100% coconut shell whereas pellets of 100% hard coal. This renders this question meaningless. Apologies for ...
Claudio's user avatar
  • 101
3 votes
1 answer
176 views

Reading and adjusting pH of reverse osmosis water

I grow things for a living and regularly use pH meters + strips to read and adjust the pH of various nutrient and pesticide solutions. Oftentimes, I have a need for nearly naked water with the pH ...
Michael John's user avatar
0 votes
2 answers
1k views

Can Adding Alcohol Create Potable Water? [closed]

I've been exploring various methods for purifying water, and I'm curious about the potential effects of adding alcohol to make it potable. Could the addition of alcohol serve as a means of purifying ...
Dino 's user avatar
  • 29
-2 votes
2 answers
537 views

Ammonia (NH3) vs Ammonia Nitrogen (NH3-N)

I've been looking into chloramination (chlorine & nitrogen reactions) and noticed many papers either reference Ammonia (NH3) or Ammonia-Nitrogen (NH3-N), seemingly interchangeably. Is the ...
Kuhrta's user avatar
  • 65
0 votes
2 answers
172 views

What is meant by 'as Cl2'

I feel like I'm over thinking this one, but think I need a confirmation (and quantified example) to put my confusion to bed. I'm more a mechanical than chemical background but trying my best. I really ...
Kuhrta's user avatar
  • 65
1 vote
0 answers
33 views

Pressure degasser of water

Currently, I am working on a project where we are using pressure degassing. The idea is to make a test setup where we lower the pressure in a flask to 'degas' the solution. The solution is just ...
quinten's user avatar
  • 11
0 votes
0 answers
501 views

Weight Ratio vs Molar Ratio - Chloramines

I'm working with a delicate experiment whilst trying to test corrosion of stainless-steels in a chloramine environment. I've run into various literature that discusses the formation of different types ...
Kuhrta's user avatar
  • 65
2 votes
0 answers
130 views

Chloramines & Nitrogen Trichloride vs Stainless Steel [closed]

We've recently experienced excessive corrosion on stainless steel within indoor pool environments. We believe this is due to chloramine (gasses) in the atmosphere. To test this, I plan to create a ...
Kuhrta's user avatar
  • 65
0 votes
0 answers
171 views

Are there any real dangers to using lead fishing sinkers to hold a shower curtain in place?

I am hoping someone can help me consider if there are any factors that would make the use of lead fishing sinkers such as these in the shower risky enough to stop doing it. Specifically, they are ...
Douglas B's user avatar
  • 101
1 vote
0 answers
71 views

How to remove hydrofluorosilicic acid from water?

I'd like to come as close as possible to pure water. Would a KF filter remove hydrofluorosilicic acid? If not, what would? I could not find the concentration of hydrofluorosilicic acid, but would like ...
Woodsman's user avatar
  • 119
-1 votes
1 answer
119 views

Is there a way to neutralize aluminum hydroxide in pool water?

Pool water sat unfiltered for 12 months with heavy leaf debris. Once manual removal was completed a variety of chemicals were introduced. In particular alum powder. This alum powder has decomposed ...
user2513203's user avatar
-1 votes
3 answers
600 views

How to make clean water from urine in a wastewater treatment plant? [closed]

Referring to a video here, describing a filter that treats wastewater, wouldn't urine in the wastewater not get filtered out because a sand filter alone does not separate urine from water? How is ...
jessica smith's user avatar
3 votes
1 answer
397 views

Is calcium hypochlorite as effective as sodium hypochlorite in sanitizing a swimming pool from algae?

Question From this question we know that what swimming pool stores refer to as "liquid chlorine" (sold in 10 gallon jugs) is most likely sodium hypochlorite ($\ce{NaOCl}$). In the spirit of ...
Sam7919's user avatar
  • 153
0 votes
1 answer
219 views

Are liquid chlorine and super-shock chlorine the same?

To shock a swimming pool one uses either calcium hypochlorite ($\ce{Ca(ClO)2}$), commonly sold from at least one major brand in pouches, or the more obscure "liquid chlorine". I'm saying &...
Sam7919's user avatar
  • 153
3 votes
1 answer
221 views

TV Program Said Remove Some of Chlorine in Water By Putting Hose On Fine Spray

A UK TV program suggested that some of the chlorine in tap water can be removed if you fine spray it from your hose, such as with un upside down fine sprayer. Is this true? How effective is it?
Rewind's user avatar
  • 139
-1 votes
1 answer
133 views

Why is desalination waste usually disposed back into the sea instead of converting it into chemical products?

I was reading about the desalination processes such as reverse osmosis and capacitive deionization and their alternatives. They all work on removing ions from water and disposing them back to sea/...
Belal Bahaa's user avatar
-1 votes
1 answer
238 views

I want to dechlorinate my tap water to use in an organic garden. I've purchased a product called Seachem Prime that is typically used for aquariums [closed]

I purchased a product called a seachem prime to dechlorinate my tap water so I can use it in my organic garden inside. I want to know if the product itself is safe to use on my plants and if there ...
Aaron King's user avatar
1 vote
0 answers
54 views

Can a TDS meter have a false initial reading due to some instrument artifact?

I have total dissolved solids (TDS) meter which is built in to a water purification system and this meter always reads high, around 90-100 when the machine is turned on, but over the next 30 seconds ...
Shaka Boom's user avatar
  • 2,324
2 votes
0 answers
1k views

The use of far-infrared ceramics for water purification?

I am struggling to understand how exactly far infrared ceramic balls help purify the water. It is stated that active ceramic taormine balls help purify the water by forming a 2 micrometer wavelength ...
Albertthephilosopher's user avatar
2 votes
0 answers
86 views

Characteristics of metals compatible with semiconductor grade Ultra Pure Water (UPW)?

I am looking to build a water conductivity sensor for semiconductor grade Ultra Pure Water (UPW). UPW conductivity sensors already exist, but because of price and low water volume I need to fabricate ...
ericnutsch's user avatar
-2 votes
1 answer
274 views

Why isn't there hydrofluoric acid in fluoridated water? [closed]

From what I've read, when water is fluoridated it's done so either by $\ce{NaF}$ artificially or $\ce{CaF2}$ naturally. If this is correct, shouldn't the reaction $\ce{CaF2 + H2O -> CaO + 2HF}$ ...
0x777C's user avatar
  • 197
2 votes
0 answers
78 views

How to compute a needed volume of solution to adjust to a target pH

I am a software engineer and I would like to solve a chemistry problem. I have revised the subject a bit to understand the basics :) My goal is to maintain a constant pH of a water tank (tap water). I ...
David Cruchon's user avatar
-2 votes
1 answer
354 views

Why do we clarify water with alum, but beer/cider/wine with bentonite?

My understanding of clarifying (floccing) liquids is that we add a mineral with an electric charge, which attracts suspended particles (like bacteria) which I assume have the opposite charge. The ...
AshleyZ's user avatar
  • 97
0 votes
0 answers
202 views

Reaction of propanoic acid with chlorine used in wastewater treatment

I'm asked in a problem to write down the equation of the reaction of propanoic acid with chlorine used in wastewater treatment: $\ce{CH3-CH2-COOH +Cl2}$. The problem also states that, in this reaction,...
User1234321's user avatar
2 votes
0 answers
56 views

Hazardousness of Chlorothalonil & metabolites in shower water? [closed]

Recently it came out, that in some parts of Switzerland (where I live), there is Chlorothalonil & metabolites/breakdown-products of it in the drinking water. Yikes. Problem is, chlorothalonil ...
Stefan Steiger's user avatar
0 votes
0 answers
30 views

Total concentration conversion

when dealing with waste water and the total values of P, N, C are given in ppm units, what molecular weight is used for converting from ppm to molar? for Example- what will be 12 ppm of P(T) in Molar ...
Efrat Brayer's user avatar
2 votes
1 answer
72 views

Hard water filtration

Why does hard water have to pass through the cation exchange resin first followed by the anion exchange resin? Why can't it be the other way around?
Deepu Johnson's user avatar
0 votes
1 answer
456 views

What about sodium triphosphate in drinking water?

Recently, at my place, a sort of filter for hard water was installed. They told me that it contains sodium triphosphate which is dissolved into all the water that enter home, i.e. both cold and hot ...
gabt's user avatar
  • 101
1 vote
1 answer
60 views

Do antimicrobial abilities of copper boilers decrease over time?

As copper boilers age and develop oxide buildup, does this lessen the copper's antimicrobial abilities in killing bacteria? I was thinking since that coating would be on the copper, there would be ...
dman's user avatar
  • 159
4 votes
0 answers
84 views

For what chemical purpose did soldiers in WW2 carry small ion exchange resin columns in their survival kits?

My textbook [Chemistry Live, Declan Kennedy] states that ''During WW2 small ion exchange resin columns were part of a soldier's survival kit.''. I can't find any further info about this online or ...
Kantura's user avatar
  • 709
5 votes
4 answers
2k views

Any idea why tap water goes stale overnight? [duplicate]

We have great tap water here in Hungary. My only problem that it goes stale overnight sometimes in some glasses or sometimes even the 2L water boiler has this problem too. But microbes cannot resist ...
inf3rno's user avatar
  • 456
-1 votes
2 answers
6k views

Is there a safe way to neutralize bleach at home [closed]

I don't want to simply replace one hazardous chemical with another. The bleach is stubbornly clinging to my shower walls and I feel its effects every time I take a shower. Ascorbic acid seems like the ...
Colorfulworld's user avatar
-1 votes
1 answer
1k views

Why is RO water more corrosive?

According to several articles from the American Water Works Association, permeate from RO should be stabilized in terms of pH and hardness to avoid corrosion of the distribution piping. How does ...
user115968's user avatar
-1 votes
2 answers
440 views

What are the properties of water in glaciers? [closed]

Does water from glaciers have many minerals (hard water) or would it be considered pure or distilled water?
user6759997's user avatar
-1 votes
1 answer
519 views

Devarda's alloy procedure

Hello dear I have a small question I want to do kjeldahl distillation for a 100 mL sample of water after reduction with devarda's alloy to measure the concentration of nitrate nitrogen... I want to ...
Shafik Saad's user avatar
0 votes
0 answers
94 views

Generating hypochlorous acid for disinfecting water using HClO2

I use a product that contains $\pu{700 ppm}$ of $\ce{HClO}$ to disinfect water at $\pu{1 ml}$ per $\pu{1 l}$ and let it rest for about $\pu{2 hrs}$ before I use it so there is no $\ce{HClO}$ left ...
tbraun89's user avatar
  • 109
0 votes
1 answer
302 views

How can I measure the scale in water?

I have hard water in my house. All the taps have tartar around. It generates some problems in some of my home appliances so I have bought polyphosphate salt but when I boil water I don´t get the ...
Ignacio's user avatar
  • 119
5 votes
1 answer
235 views

TKN: Why are they called Missouri tablets?

When analyzing for Total Kjeldahl Nitrogen (TKN), you can make a copper sulfate digestion solution in the lab or purchase a variety of pre-prepared digesting tablets for example on VWR. My question is,...
SLR's user avatar
  • 161
2 votes
2 answers
5k views

Heat effect on diluting concentrated NaOH solution

I am an engineer in water treatment and have a chemistry question. In water treatment we dose $32\%$ sodium hydroxide solution for $\mathrm{pH}$ adjustment and there is a concern that our dosin lines ...
Kieran Melrose's user avatar
-1 votes
1 answer
44 views

Variations in solubility of total dissolved salts in water with temperature [closed]

I want to know the solubility of "total dissolved salts" or mainly Calcium Chloride and Magnesium Chloride causing hardness of water. Is this data published anywhere at different temperatures?
Sai Manoj Kumar Yadlapati's user avatar
1 vote
2 answers
1k views

Can Na2CO3 remove temporary hardness of water?

This was asked in my test and I remembered that all compounds that can remove permanent hardness of water can remove temporary hardness of water also. But my teacher marked it wrong and I cannot find ...
smeone's user avatar
  • 51
0 votes
0 answers
119 views

Could the Superoxide Radical Anion Be Responsible for the Removal of Chlorine Dioxide Used to Treat Natural Waters?

Some background facts: $\ce{ClO_2}$ is a gas that is highly soluble in water (some 8 g/L at 20 °C). However, per Wikipedia , to quote: It does not hydrolyze when it enters water, and is usually ...
AJKOER's user avatar
  • 5,526
1 vote
1 answer
351 views

Creating 1L of 1000 ppb stock solution of Pb2+

I’m testing on samples that require a concentration of 1000 ppb (or 1 mg/L) of Pb 2+. My first thought was to simply dissolve 1 mg of Lead nitrate in 1 L of deionized distilled water to create 1 L of ...
Mas's user avatar
  • 447
1 vote
1 answer
89 views

Methods to quantify lead(II) concentration in water on the ppm/ppb level

While there are several ways to quantify metal concentrations in water, a lot of them are only specific to select metals. For example, there is the orthophenanthroline method for quantification of Fe(...
Mas's user avatar
  • 447
0 votes
3 answers
220 views

Is it possible to measure light absorbance for analysis of lead concentration without photospectrophotmeter

I’m designing an experiment which requires I measure final and initial lead concentrations for the determination of aqueous lead uptake by different mediums. Because lead concentrations would be ...
Mas's user avatar
  • 447
2 votes
1 answer
116 views

How concentrated does the analyte solution need to be in order to perform a (chelatometric) titration

I’m currently investigating a method to chemically pretreat cellulosic waste as bisorbents for enhanced uptake of lead in water. I intend to measure the initial and final concentration of water to ...
Mas's user avatar
  • 447
4 votes
0 answers
61 views

membrane for a reverse osmosis desalination experiment

We are second year cram schoolers , we are currently working on a project tackling water desalination by reverse osmosis and are required to do an experience. During the process, we encountered some ...
moistandunstable's user avatar
0 votes
2 answers
2k views

How much of Sodium dichloro-s-triazinetrione dihydrate should I use to replace bleach? [closed]

I am trying to determine how much sodium dichloro-s-triazinetrione dihydrate powder I should add to water to create a dilution that can be injected into my water supply to react with the Hydrogen ...
Karl Bystrak's user avatar
0 votes
1 answer
104 views

Using charcoal to clean water [closed]

I have read about charcoal being used to clean water before it is then boiled or mixed with a UV light stick. I have some questions about this: 1) Does it have to be activated charcoal? 2) Can ...
securityauditor's user avatar
-3 votes
3 answers
113 views

Is boiling tap water a must to destroy human mucus, proteins, fats, sugars and nucleic acids it may contain?

I understand that humans consume tap water which are chemically treated after pumped from natural or artificial reservations. Sometimes people contaminate these reservations by spitting, pissing and ...
user avatar