wastewater specification:
COD=High
pH=2-3
can we use some extractor like TEHA (Triethyl hexyl amine)??
any other suggestion for H2SO4 removal??
You can try an adsorbent that has been used for the removal of sulphate generally eg activated carbon
First of all, please all note that there is no possibility to have sulfuric acid in the wastewater. Sulfuric acid is a strong acid and dissociates completely to hydrogen ion and sulfate. Consequently, when there is sulfuric acid input to the wastewater, pH drops and sulfate concentration increases.
In this context, pH can be corrected by alkaline dosing. The best way for sulfate removal is precipitation as Barium sulfate or any other salt that readily precipitates.
At any rate, adsorption should be out of question, mainly because everything else will be adsorbed but sulfate.
Thanks dear Abdur-Rahim, Kim and Derin,
Abdur-Rahim my purpose of removing H2SO4 from waste water is to neutralize this wate, but by removing sulfate the pH is still remains low. am i right?
So i need a way to remove both H ions and SO4 Ions.
Kim could you please explain about this Steel Wool filter? this filters remove acid or sulfate ions?
and are they resistant in acidic media?
Derian, you explained this fact in the best way, and you're right we can use alkaline to neutralize it, but i wanna try other treatments to neutralize this watstewater like adsorption (if possible) or extraction (look at this http://www.pp.bme.hu/ch/article/view/201/96)
about Barium sulfate, what base we can add to wastewater to produce Barium sulfate? Ba(OH)2??
if you mean Ba(OH)2, you should consider that this below reaction does not work.
Ba(OH)2(s) + H2SO4(aq) → BaSO4(s) + 2H2O(l)
Dealing with sulfuric acid addition to the wastewater strongly depends upon what you are required to do afterwards.
(i) if the requirement is only neutral pH ( discharge limitations of following biological treatment) you only need pH adjustment without worrying about sulfate
(ii) if the requirement - legal or technical - also involves sulfate control ( protecting sewers) then you try to remove sulfate by any means feasible, but not by adsorption!..
i just wanna neutralize it and lower the COD and after that drain it to environment.
A.E. Simpson, C.A. Buckley., The removal of sulphuric acid from natural and industrial waste waters
Desalination Volume 70, Issues 1–3, November 1988, Pages 431-442 (International Membrane Technology Conference '88)
Abstract
A process is described which enables the removal of sulphuric acid from effluents without the addition of chemicals to the effluent. The technique employs an anion selective membrane which separates the acidic effluent from a lime solution.
In the case where no current is applied, facilitated transport occurs and the driving force for the demineralisation process is the difference in the chemical potential of the species on either side of the membrane. The equilibrium position may be shifted by the passage of a current through the membrane, in which instance the driving force becomes the applied electric potential.
The sulphates are removed as calcium sulphate, which precipitates in the lime solution. The specific membrane area requirements are a function of the desired degree of acid reduction. The application of low current densities (500 A/m2) reduces the specific membrane area requirements for a particular duty by two orders of magnitude compared to facilitated transport.
Results of laboratory investigations are given and indicate that the sulphuric acid component can be removed from waste waters without an undesirable build-up of additional dissolved solids.
may be used:
Dear Helena
My idea with the Steel wool is that the H2SO4 will react with the Iron to form FeSO4 or eventually Fe2(SO4)3. Having the water flowing trough the steel wool will let it function as and absorber since the reaction will take place on the surface and if you replace he the wool often enough you can in that way remove the SO4 from the water Phase.
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