Technology Transfer Group, popular as TTG in IIT Kharagpur is the student arm of Sponsored Research and Industrial Consultancy (SRIC), IIT Kharagpur. TTG acts as a vehicle to create IP awareness on R & D activities at IIT Kharagpur. Promotional activities of TTG are found to draw interest of industry in technologies developed at IIT Kharagpur.
Tuesday, 21 April 2015
Technology for removal of humic acid
Patent filing no.: 1058/KOL/2014
Technology title: Chitosan coated iron-oxide- polyacrylonitrile
mixed matrix membrane for removal of humic acid
description of the technology
proposed invention relates to the fabrication of mixed
matrix membrane (MMM) using iron oxide nanoparticles and polyacrylonitrile
(PAN) coated with chitosan which is used for removal of humic acid from surface
Typical humic acid concentration in surface water is up to 50 mg/l whereas in
drinking water EPA imposed limit is 2 mg/l. The composition of the membrane was
15 wt% PAN, 0.4 wt% iron oxide and rest was solvent dimethylformamide (DMF).
The molecular weight cut off of this membrane was 44 kDa. The membrane was tested
at different concentration of synthetic humic acid as well as pond water. The
range of operating conditions for was 276 kPa to 550 kPa and 40 to 80 l/h cross
flow rate. The filtered water produced was in the range of 15 to 25 l/m2h
and total humic acid concentration in filtrate reached below permissible limit
i.e., 2 mg/l. The process does not need addition of external additives or
catalysts and process throughput is high.
Commercial aspects of
the technology & industries benefiting from it:
water treatment plant, as an annexure to the main operating section of various
filter for domestic and industrial use.
·Unique formulation of
membrane removes humic acid.
·Concentration of humic acid
in the treated water was reduced below 2 mg/l (EPA limit).
·Iron oxide nanoparticles are
inexpensive thereby, reducing the operating cost.
·Any post processing step is
·Selective adsorption of
humic acid, microorganisms and filtration of larger particles are attained in a
A summary of the technical details involved
1.Composition of base mixed matrix membrane:
a)15 wt% coated polyacrylonitrile (PAN);
b)iron oxide in an amount ranging from 0.4 wt%; and
c)solvent dimethyl formamide (DMF) in an amount ranging
from 84.6 wt%.
2.Composition of chitosan coating:
a)1 to 5 wt% chitosan in 1 to 6 vol% acetic acid;
b)Glutaraldehyde in an
c)NaOH in an amount ranging
from 0.5 to 1 N.
5. Future prospects of the technology
use in waste water treatment plant.
of scaled-up filter for domestic and industrial use.
Inventors: Prof. Sirshendu De, Ms. Swapna Rekha Panda, Ms. Munmun Mukherjee