I am not an expert in this Sanath but roughly thinking I would suggest the electrochemical cells as this gives the possibility to select your electrodes. Hence according to reduction potential of different materials you'd be able to select the most appropriate one to recover the metals in water.

Hi sanath,

I will suggest you electrochemicall cell were most preferable for metal recovery from wastewater.

Dear sanath,

In my openion, electrochemical systems were most preferable where your target is only metal recovery.

But if you are targeting both wastewater treatment and metal recovery then you can prefer Microbial fuel cells where simultaniously both will occur. Really a nice question. keep it up.

Electrochemical is well known for metal recovery.. MFC is for WWT...

https://www.omicsonline.org/open-access/wastewater-treatment-with-microbial-fuel-cells-a-design-and-feasibilitystudy-for-scaleup-in-microbreweries-2155-9821-1000267.php?aid=67048

http://pubs.rsc.org/en/content/articlehtml/2013/ee/c3ee43106a

Article The Integrated Processes for Wastewater Treatment Based on t...