New wastewater treatment technology
- An affordable electric field-assisted membrane separation device that separates oily waste from water has been developed.
- This innovation is an economically feasible wastewater treatment technology (both in terms of capital and recurring investment) for low-scale and medium enterprises.
The technology developed by Dr Chiranjib Bhattacharjee, Professor at the Chemical Engineering Department in Jadavpur University, Kolkata, uses a combination of Electrocoagulation and Electroflotation Enhanced Membrane Module (ECEFMM) techniques for wastewater treatment.
Electrocoagulation is a wastewater treatment technique that uses electrical charge for changing the particle surface charge, allowing suspended matter to form aggregates.
Electroflotation is the separation of suspended particles from water using hydrogen and oxygen bubbles generated by passing electricity through water.
In the developed module, electrocoagulation and electrofloatation are adjoined with the membrane in a single indigenous setup.
- The turbulence created because of the hydrogen bubbling through the feed medium or the waste-water resists the deposition of oil over the membrane.
- The synergistic effect of hydrogen bubbling and rotation of the membrane module creates substantial turbulence within the solution and on the membrane surface.
- On application of electric field during membrane separation, membrane fouling is substantially reduced, and membrane longevity is also enhanced by restricting the membrane ageing for a prolonged time period.
- Thus, it requires less frequent membrane replacement, thereby reducing the maintenance costs to a great extent.