Page 15 - CIJ June 2025-Digital Edition

NEWS TRACK

Acoustic-Driven Surface Cleaning: A Study

recent study published bubbles) than the Minnaert frequency scaling with
by Cornwell University resonance for a bubble of bubble size (αR_3/20).
investigates an the same size,” according to Cleaning efficacy, assessed
alternative approach: the report.
A acoustic-driven surface Experiments reveal that at using protein-based artificial
cleaning using millimeter- this translational resonance, soil on glass slides, was
sized bubbles excited at low, stationary bubbles exhibit improved by approximately
sub-cavitation frequencies. amplified lateral swaying, 90\% when bubbles were
Traditional surface while bubbles sliding on driven at their translational
cleaning methods often an inclined surface display resonant frequency
suffer from drawbacks such pronounced “stop-and-go” compared to off-resonant
as chemical harshness, dynamics. frequencies or non-acoustic
potential for surface The theoretical model conditions.
damage, and high energy treats the bubble as a forced,
consumption. damped harmonic oscillator, These findings
Through this study, “We where surface tension demonstrate that leveraging
identify and characterize provides the restoring force translational resonance
a distinct translational and the inertia is dominated enhances bubble-induced
resonance of these bubbles, by the hydrodynamic added shear and agitation, offering
occurring at significantly mass of the surrounding an effective and sustainable
lower frequencies (e.g., 50 fluid. It accurately predicts mechanism for surface
Hz for 1.3 mm diameter the observed resonant cleaning.

Lucknow – Up’s First ‘Zero Fresh Waste Dump’ City

ucknow has become The Lucknow Municipal converted into Refuse-
the first city in Uttar Corporation (LMC), which Derived Fuel (RDF) for the
Pradesh to achieve 100% received departmental cement and fertiliser sectors,
processing of its daily support of approximately recycled construction and
Lmunicipal solid waste, ₹100 crore, was authorised demolition (C&D) material
with zero fresh waste now to collaborate with private for infrastructure use, and
being sent to landfill. players through a tender- compost for agriculture.
This milestone was based model. This public- Innovative waste-to-
reached following the private partnership model art projects such as the
inauguration of the city’s has also enabled significant
third waste processing progress in the city’s UP Darshan Park, where
facility at Shivri West. The legacy waste remediation monuments like the Taj
new plant, with a capacity programme. Mahal and Red Fort have
of 700MTs per day (TPD), Nearly two-thirds of the been recreated use recycled
brings the total processing city’s 19 lakh MTs of legacy materials. A similar initiative
capacity of Lucknow to over waste have been remediated. has also been implemented
2,100TPD — effectively Around 13 lakh MTs have at Kalawati Park in
matching the city’s current been cleared, freeing up 25 Prayagraj. The model has
daily waste generation of acres of land. An additional attracted international and
around 2,000TPD. 15 acres is expected to be national attention, with
The new initiative also cleared within the next six delegations from Brazil and
paves the way for the city’s months. Andhra Pradesh recently
commitment to responsible The city’s integrated waste visiting the sites to study the
and circular waste processing approach focuses city’s waste management
management. on municipal waste being framework.
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