2026-10-13T16:44:34Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34022573 2026-09-29T10:40:02Z category_146 category_7 category_21 category_272 category_873 category_39 category_69 category_132 portal_87 item_type_6 month_year_09_2026

Coupled iron-modified biochar and myriophyllum for nutrient and oxytetracycline removal from aquaculture wastewater Wei Qian (56612) Yili Deng (20518175) Yongzheng Zhang (1479694) Xiaolong Liu (265696) Hui Liu (33624) Zenghui Diao (5941745) Yan Yu (56143) Maoyou Ye (25136543) Yunqiang Yi (25136546) Jialin Liang (12194723) Space Science Medicine Biotechnology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Ecology Inorganic Chemistry Infectious Diseases Modified oyster shell biochar adsorption oxytetracycline aquaculture wastewater ecological purification system Aquaculture wastewater commonly contains excess nutrients and residual antibiotics, whereas conventional plant-only ecological ponds may provide insufficient removal of these coexisting contaminants. To enhance system performance through substrate engineering, iron-modified oyster shell biochar (IOBC) was developed as a functional medium and coupled with Myriophyllum in an ecological purification system. Response surface methodology identified optimal IOBC preparation conditions of 700 °C, a modification ratio of 1:1, and 3.5% iron addition, under which oxytetracycline (OTC) removal reached 89.37%. The optimized IOBC was subsequently incorporated into a continuous-flow system treating simulated aquaculture wastewater. In the continuous-flow system treating simulated aquaculture wastewater, pollutant removal increased with hydraulic retention time, and the coupled IOBC-Myriophyllum treatment consistently outperformed the filler-only and plant-only systems. At 72 h, the coupled system achieved removal efficiencies of 38.89% for NH4+-N, 38.79% for TN, 72.81% for TP, 67.67% for CODMn, and 59.46% for OTC. Sequencing and mechanistic analyses indicated that the enhanced performance resulted from coordinated adsorption, plant uptake, microbial nitrification and denitrification, Ca- and Fe-mediated phosphorus precipitation, and oxidative and biological transformation of OTC. These findings demonstrate that functional substrate modification can strengthen ecological treatment of nutrient- and antibiotic-containing aquaculture wastewater. 2026-09-29T10:40:02Z Text Journal contribution 10.6084/m9.figshare.34022573.v1 https://figshare.com/articles/journal_contribution/Coupled_iron-modified_biochar_and_i_myriophyllum_i_for_nutrient_and_oxytetracycline_removal_from_aquaculture_wastewater/34022573 CC BY 4.0