Pilot-scale integration of micron-sized powder carriers and a hydrocyclone separator enhances nutrient removal in wastewater treatment
Year: 2025
Type: article
Abstract: Activity, abundance, and synergy of functional microorganisms are pivotal for wastewater treatment. Here, we developed a micron-medium biofilm composite sludge system, integrating powder carriers and a hydrocyclone separator to enhance functional bacterial enrichment and micro-granule formation. Powder carriers acted as bridges between zoogloea, facilitating coexistence of micro-granules (~115.8 μm) and suspended flocs, thereby improving microbial synergy. The pilot-scale system doubled treatment capacity without expansion or downtime, achieving effluent total nitrogen <5 mg L−1 and total phosphorus <0.3 mg L−1 at a hydraulic retention time of 4.85 h. Micro-granules enhanced sludge settleability, mass transfer, and endogenous carbon metabolism, including polyhydroxyalkanoate and glycogen synthesis, which provided essential electron donors for nutrient removal. Denitrifying and phosphorus-accumulating bacteria were enriched in micro-granules (4.46%), whereas nitrifying bacteria (1.25%) were concentrated in flocs. Differentiated spatial distribution balanced the sludge age conflict among functional bacteria. This work provided an efficient and low-carbon strategy for municipal wastewater treatment. Hong Wang and colleagues developed a wastewater treatment process using powder carriers and a hydrocyclone to enhance enrichment of functional bacteria and granulation. This offers an efficient, low-carbon solution for municipal wastewater treatment.
Source: Communications Engineering
Authors: Hong Wang, Boran Wu, Hongbo Han, Qun Gu, Xiaohu Dai
Institution: Tongji University
Language: English
Subfield: Pollution
Field: Environmental Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,190
OpenAlex ID: W4413641514