Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF in Academic
If I add chlorine gas to the water at a dose that exceeds the required rate, how do I treat the water to decrease the concentration of chlorine in water?
What are the efficient methods of mitigating the chlorine gas overdose?
Category: Academic
SMBS dosing is the cheapest and most full proof conventional system.
Published by KUNJESH MALI, MR.
Simple and cheapest way is to expose the water to the Direct sunlight with thorough Aeration.
Sodium thiosulphate can be used @ 0.75 ppm for 1 ppm residual chlorine
Ascorbic acid or Vitamin C can be used @ 1:1 ratio.
Activated carbon too can be used
it is more useful to reduce chlorine concentrations, Odorous, Chloramines (Carcinogens) and heavy metal & pesticides
Published by Dr.Nageswar Rao P.V, Shrimp hatchery consultant, Board of Studies, Dept of Bio-Technology, Andhra University
Nailed to perfection sir
Published by KUNJESH MALI, MR.
Good morning,
You can dose sodium Meta-bisulfite as a reductor, or use a GAC filtration as previously suggested.
Published by Philippe DROUET
Hi,
leave it some time and concentration of chlorine automaticaly drop down. Speed of concentration decreasing is directly influenced by temperature and concentration of oxidable compounds (Mn2+, Fe2+, organic matter etc.). Dosing of any other chemicals (thiosulphate, Vitamic C, ...) is used in sampling procedure NOT in normal operation. If you want to improve speed of de-chlorination, it is possible to use aeration.
Ladislav
Published by Ladislav Bartos
Perhaps ozone is more appropriate because it evaporates after cleansing ?
Published by Rosemary Jones
There are very good ascorbic acid (Vitamin C) based dechlorinating agents that are safer to use than many of the sulfiite based products. Here is link to one product that we use to dechlorinate backwash water before releasing back into a stream: www.vita-d-chlor.com
Published by Diana Beehler, Water Quality/Laboratory Supervisor
Sodium thiosulphate is the most effective chemical addative for chlorine reduction (FAC) in water
Published by Shane Blake, Supervisor at Veolia
Activated Carbons transform chlorine to chloride without adsorption. Hence the life of the carbon bed is predicted very long with negligible running costs. However you will find chloride ions in your treated water
Published by Marco Rognoni, Owner at WET, Water Edge Technologies
Hi,
First of all, why should you overdose gas chlorine? there are many reasons why perhaps if you tell us more. Also, the two things we pay close attention to in the parlance of water treatment are quality and economy in other words achieving the desired quality with minimal waste or minimal amount of chemicals. Remember Chlorine is a carcinogen.
Chlorine can and will dissipate over time (especially gas chlorine) so one of your best bet is to allow it time to dissipate or if you're concerned with the taste it may give the water then pass it through activated carbon filters slowly..
Published by Abba Ahmed
Dechlorination in a fixed bed of granular activated carbon can help you as the activated carbon functions as a reducing agent. It is also functional to oxidize the mixture by shaking or in a cooling cascade.
Published by Axel Briones, Commercial Operation at CAASA, Aguascalientes, México
It is a general question and for this reason there are several answers. Please clarify your problem with more information.
Published by Ademar Cesar Ferreira, H2O Engenharia Ltda - General Director
Wikihow suggests vitamin c tabs,and carbon filter
Published by Suresh Kumar.S
Thank you my friend
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
Campden tabs and pitcher filters for excess chlorine,but not effective against VOCs.
Published by Suresh Kumar.S
Thank you
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
Mohammed... Drinking water authorities usually add a slightly higher dose of chlorine before pumping it to the consumers. This ensures enough disinfection agent for those places that are far from the production site. Thus, it is a safer measure to guarantee that far consumers are protected from any disease causing microorganism. Chlorine may be lost from water with time and there is no need for the addition of chemicals to reduce chlorine. Thus, simple stirring is enough to reduce excessive chlorine in water.
Published by Mahmood M. Barbooti, Assistant Professor at University of Technology, Iraq
What you're suggesting is chlorine in combined form called amines; it can be mono-chloro amine, di-chloro-amine etc It is usually not in excess and it's done to take care of any re-contamination in the distribution system due to leakage and suctions back into the pipe due to pressure loss for any reason.
Published by Abba Ahmed
Chloramines are a different thing to ensuring that there is an adequate free chlorine residual for disinfection. Chlor amines are not strong disinfectants and so it is usually important to disinfect with free chlorine and then convert to chloramine for distribution. Many operators prefer to ensure that the time part of concentration time multiple is maintained rather than making up for poor contact time with high chlorine.
Published by Steve Oxtoby, Process Engineer
Following procedure to remove chlorine
https://www.youtube.com/watch?v=Uu8XQWdnZEs
Published by Prem Baboo, Researcher at www.researchGate.net
I think you will find 4 and 5 are the same thing. Also, the oxygen does nothing in aeration. It is just gassing off and taking the chlorine with it.
Published by Phillip Walker
Thank you very much
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
In which kind of water treatment you did this?
Published by Ibrahim El Salhi
I did this for drinking water in the final step of water treatment befor pump it to water net work
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
You can remove chlorine from your tap water by using a Granular Activated Carbon (GAC) filter that will absorb and trap most natural organic compounds, tastes, odors and synthetic organic chemicals.
Published by Ibrahim Ibrahim, Water and Sanitation Engineer at MINUSMA
Treatment methodology will depend on end use. For drinking applications aearation may be better or activated charcoal. For industrial use sodium metabisulphite may be better.
Published by Ashwini K Sinha
Thank you
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
Chlorine in water is reduced by adding a reducing agent. either sulphur dioxide as a gas or sodium sulphite or bisulphite as a liquid reagent. in an emergency situation or to reduce chlorine in water that is to be flushed to a watercourse solid sulphide chemicals can also be used. Adding a higher level and then reducing it after a contact time is a common practice, usually about 0.3 mg/l is left as residual for distribution though this depends on the nature of the distribution system. Alternatively you can use activated carbon to reduce it but be careful as this and the aeration others have suggested would then expose the water to contamination again.
Published by Steve Oxtoby, Process Engineer
You are nice man thank you
Published by Mohammed Abd Elsalam, WASH Consultant-UNICEF
The demand for chlorine is probably due to residual oxygen demand or organics in the water stream. I would recommend taking a look at the processes producing the water being disinfected. You could probably optimize the upstream process to produce a cleaner water with fewer contaminants.
Published by Surya Pidaparti, PE, Novus Energy LLC - Vice President, NBC Systems