Fwd: [arsenic-crisis] Correction: NaOCl or bleach, not Cl2

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M Jahangir

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Jan 21, 2014, 12:11:21 AM1/21/14
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---------- Forwarded message ----------
From: Vasant Soni <vasan...@yahoo.com>
Date: Sun, Jan 19, 2014 at 8:16 PM
Subject: Re: [arsenic-crisis] Correction: NaOCl or bleach, not Cl2
To: "mjahan...@gmail.com" <mjahan...@gmail.com>, Meer Husain <matrib...@yahoo.com>, dr_sara_bennett <ac...@bicn.com>, Dr Din Muhammad <cccc...@gmail.com>
Cc: "srs...@yahoo.com" <srs...@yahoo.com>, "fahimah...@yahoo.com" <fahimah...@yahoo.com>, "christ...@yahoo.com" <christ...@yahoo.com>, "bahada...@yahoo.com" <bahada...@yahoo.com>, "misa...@unicef.org" <misa...@unicef.org>, "imran...@plan-international.org" <imran...@plan-international.org>, "pc...@isb.comsats.net.pk" <pc...@isb.comsats.net.pk>, "dani...@freshwateraction.net" <dani...@freshwateraction.net>, "arsenic...@yahoogroups.com" <arsenic...@yahoogroups.com>, "aalok...@gmail.com" <aalok...@gmail.com>, "ruplek...@rediffmail.com" <ruplek...@rediffmail.com>, "ma...@iitk.ac.in" <ma...@iitk.ac.in>, "jpr...@cal2.vsnl.net.in" <jpr...@cal2.vsnl.net.in>, "mnmk...@hotmail.com" <mnmk...@hotmail.com>, "at...@uderc.com" <at...@uderc.com>, "hydro...@yahoo.co.uk" <hydro...@yahoo.co.uk>, "michae...@eawag.ch" <michae...@eawag.ch>


All Arsenic crises group members
 
If any one is willing to try out simpler process propsed by me and has access to Arsenic contaminated water and has good testing facilities and has resonabaly good chemistry backgound he should contact me
Or if any one is visiting Bombay, I would be happy to discuss and demonstrate the process based on use of adsoption of Arsenic on Ferric Hydoroxide precipitate. I may have precipitated Ferric Hydroxide more than  1000 times for my other reserch work.
 
Regards
Vasant Soni
 
<DIV><FONT face="comic sans ms" color=#8000ff size=3>Vasant Soni</FONT></DIV>
From: Vasant Soni <vasan...@yahoo.com>
To: "mjahan...@gmail.com" <mjahan...@gmail.com>; Meer Husain <matrib...@yahoo.com>; dr_sara_bennett <ac...@bicn.com>; Dr Din Muhammad <cccc...@gmail.com>
Cc: "srs...@yahoo.com" <srs...@yahoo.com>; "fahimah...@yahoo.com" <fahimah...@yahoo.com>; "christ...@yahoo.com" <christ...@yahoo.com>; "bahada...@yahoo.com" <bahada...@yahoo.com>; "misa...@unicef.org" <misa...@unicef.org>; "imran...@plan-international.org" <imran...@plan-international.org>; "pc...@isb.comsats.net.pk" <pc...@isb.comsats.net.pk>; "dani...@freshwateraction.net" <dani...@freshwateraction.net>; "arsenic...@yahoogroups.com" <arsenic...@yahoogroups.com>; "aalok...@gmail.com" <aalok...@gmail.com>; "ruplek...@rediffmail.com" <ruplek...@rediffmail.com>; "ma...@iitk.ac.in" <ma...@iitk.ac.in>; "jpr...@cal2.vsnl.net.in" <jpr...@cal2.vsnl.net.in>; "mnmk...@hotmail.com" <mnmk...@hotmail.com>; "at...@uderc.com" <at...@uderc.com>; "hydro...@yahoo.co.uk" <hydro...@yahoo.co.uk>; "michae...@eawag.ch" <michae...@eawag.ch>
Sent: Monday, January 20, 2014 6:03 AM

Subject: Re: [arsenic-crisis] Correction: NaOCl or bleach, not Cl2

Dear All
I woould like to know if " Soni Moified process" has been tried out by any one ? I am now working  on even more simpler process which will also not contribute to excessive Calcium and will be more simpler and chepar. Only your support will keep me going. I am 75 years old and have major disability due to artherities and I have no access to Arsenic contaminated water here in Mumbai where I live.
 
Regards to all Arsenic Crises Group
 
Vasant Soni
 
 
 
 
 
<DIV><FONT face="comic sans ms" color=#8000ff size=3>Vasant Soni</FONT></DIV>

Dear Ms Bennet

I think this was the link you mentioned was not published.,
You may connect this to main discussion ,
Sure this brings with it the field learning and apprehensions.
This needs full support of the bench chemists and scientists.
Thanks for your support, it is and has been a great learning.

Request scientists , chemists on board from Pakistan and south Asia to join this discussion.

We need to bridge this gap amongst the field/ Application issues and the class room discussion.

Rgds and Thanks for your support once agan

M Jahangir
Water Pakistan.com
Islamabad





On Sat, Apr 30, 2011 at 4:16 AM, Meer Husain <matrib...@yahoo.com> wrote:
Dear Mr. Sadiq,

Prechlorination by both Calcium Hypochlorite and Sodium Hypochlorite have been extensively used in municipal and small scale arsenic removal systems in USA for many years. A successful prechlorination depends on the chlorine demand and chlorine dose. Also you have to be aware of the shelf time of hydrochloride during the determination of dose for chlorination. Most importantly high concentration of iron in water is very effective for removing arsenic. If adequate iron is absent in the water in that case you can add ferrous/ferric iron, ferrous sulfate and without enough iron in water one can not effectively remove AS(III) from water. 

After prechlorination, if you use cloth filter then you have to consider the followings:

1. Is your cloth filter is reusable? if so how would you collect the arsenic/iron residue from the cloth and how would you dispose the residue?
2. Do you know how many cloth filters will be needed in a year? you have to consider the environmental economics of prechlorination, cloth filtration and collection and disposal of arsenic residue etc.
3. You have to test your filtration system on site  for each location and in that case you have to depend on the field testing kits as well as lab analysis. This is because of the fact that water chemistry varies from time to time due changes in geochemistry of aquifer caused by both human activities and natural processes.

I have developed several systems including a cloth filter. My study indicates that a community based system would be very effective rather than that of individual household system .

Regards,

Meer Husain


Sadiq Wrote:
Dear all,

Another way of simple method to remove As, Fe and Mn is, oxydizing by adding cl2 (liquid/solid) and simple filtration by cloth. I have tried this method and successfully remove at a certain level. Most important thing is dosing. If optimum dose can't be determined chloramin[e?] may form. Another problem is the smell of Cl2 sometimes not accepted by users. This problem also be solved by filtering with activated carbon.

Thanks,
Sadiq



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Regards 

Muhammad Jahangir 
Islamabad
Now At 100 N, 22nd Street. PA 19103
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For information/ discussion on Drinking Water Sanitation and    Hygiene, click                                                             
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