Dear Ali,
To separate heavy metals, this depends very much on the loads, flow rates, type of compounds and applicable discharge standards. In this particular case, the complexation of metals plays an important role. The presence or absence of hydrocarbons is important. The shape of the metals (ionic or particulate) allows or does not allow the use of membrane systems.
Heavy metals can be treated by a physico-chemical system
- Moderate investment,
- Universal and modular,
- Operating costs vary considerably depending on the effluent
Heavy metals can be treated by an electrocoagulation system
- High performance,
- Stable and reduced operating costs.
The metals may be treated by a nanofiltration system
- Very interesting if the volumes exceed 10 to 20 m3 per day and the effluents are little loaded,
- No hydrocarbons, ionic particles only,
- Allows recycling.
Heavy metals can be treated by a resin system
- Moderate investment,
- Simple system,
- Valid only if loads are very low.
With my best regards
Prof. Bachir ACHOUR
Dear Dr Ali
The various methods of removal of heavy metals from industrial wastewater include filtration, chemical precipitation, adsorption, electrodeposition and membrane systems, or even ion exchange process. But nowadays the best eco-friendly method have been conducted to find effective bio-adsorption of endemic plants or even waste of food and agricultural as a very cheap method for removal or decreasing heavy metals is following.
Best regards, parisa Ziarati
Dear Prof Bachir Achour,
I'am agree with your answer. Thanks a lot. About resin system, have an or several examples. What is the mechanism of separation of heavy metals?
Best wishes.
Kind regards!
Adel OUESLATI
Dear Prof. Ali H. Abbar,
I agree with the aforementioned points mentioned, and I would add that heavy metals removal from waste water could be diversified from the laboratory towards a large-scale applicability. In the narrow laboratory context, a low-energy consuming physico-chemical techniques of adsorption is proven effective to aqueous solutions' purification, but in a large-scale/industrial level of analysis, the accomplishment of economies-of-scale as well as the potential of heavy metals recovery, have to also considered.
Dear Adel,
Ion-exchange treatment is a technique for selectively extracting salts from water, especially metal ions: ions of a certain charge contained in a solution (eg cations) are removed from this solution by adsorption on a solid material (resin), to be replaced by an equivalent amount of other ions of the same charge emitted by the solid. Lewatit TP 207 has weakly acidic and chelating iminodiacetic groups which exhibit a marked selectivity for a whole series of heavy metals and transition metals. The heavy metals are fixed by the ion exchanger in cationic form and preferably in Low acid solutions until weakly basic. In most cases, Lewatit TP 207 is used after it has been presaturated (conditioned) using alkali or alkaline earth ions. In exceptional cases, eg Cu2 +, UO2 2+, VO2 + and Fe3 +, the use of the acid form (H +) is possible. For most metal ions which are a concern for environmental protection, selective binding by Lewatit TP 207 requires that it be conditioned, ie, after normal regeneration by acid. The resin is at least partially presaturated by means of an ammonium base or ions. For this presaturation, it is important to use only bases or ammonium ions. Indeed, the use of neutral salts (NaCl or Na2SO4) is not possible insofar as the functional group can not dissociate these neutral salts.
With my best regards
Prof. Bachir ACHOUR
Dear Prof. Bachir,
Thanks a lot for your detailed reply.
best regards!
Nanotechnology-based multifunctional and highly efficient processes could be a solutions to water/wastewater treatments
Dear sir
Actually, your question is very good and there are many methods for your purposes. As from my experience I used the floating plants for metal removal and its did well.
kindly regards.
Dear Dr Ali
The more efficient processes to be used in removing heavy metals from industrial wastewater must involve technologies for reduction of toxicity ,and also in order to reduce treatment cost and time .Treatment processes like adsorption, membrane filtration, electrodialysis and photocatalysis has drawn a great attention in recent years.
ٌRegards
of course, Dr.Paul the range of concentration plays a vital role in determining the suitable method, thanks a lot
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