MUMBAI, India, May 29 -- Intellectual Property India has published a patent application (202611050798 A) filed by Swami Rama Himalayan University, Dehradun, Uttarakhand, on April 21, for 'a self-regenerating fixed-bed column filter system employing bacteria-immobilized rice husk biochar for wastewater treatment.'

Inventor(s) include Mayank Bahuguna; Geeta Bhandari; Chandra Shekhar Nautiyal; Sanjay Gupta; Nupur Joshi; and Vikash Singh Jadon.

The application for the patent was published on May 29, under issue no. 22/2026.

According to the abstract released by the Intellectual Property India: "In the field of wastewater treatment, a self-regenerating fixed-bed column filter system integrates an inlet distribution zone, an upper support layer of quartz granules, fine-mesh screens and silica-gel pre-filter discs to ensure uniform flow. The core treatment layer comprises a homogeneous mixture of rice-husk biochar immobilized with pollutant-degrading bacteria forming a three-dimensional biofilm within its hierarchical pore structure and silica gel. Influent percolates through the support and pre-filter layers, where dissolved and colloidal pollutants are adsorbed onto the oxygen-functionalized biochar and subsequently biodegraded in situ, regenerating adsorption sites and maintaining continuous treatment performance."

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