ArticleBioprocess and biosystems engineering2026
Strategic application of sludge biochar: achieving optimal pollution treatment and greenhouse gas suppression in constructed wetlands.
Article in Bioprocess and biosystems engineering, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mitigating greenhouse gas (GHG) emissions from domestic sewage treatment remains a significant challenge. This study tested three vertical-flow constructed wetlands (CWs) with varying excess sludge biochar (ESB) ratios (10%, 20%, and 30%) to optimize performance. Results showed that the ESB dosage had a significant effect on the performance of CWs. The best pollutant removal performance was detected in ESB-CW3, where 91.63% of nitrogen and 88.43% of phosphorus were simultaneously removed from domestic wastewater. Meanwhile, the lowest GHG emissions (CO2: 17.73 mg/m2/h; CH4: 0.04 mg/m2/h; N2O: 17.90 µg/m2/h). The significant reduction in CH4 emission was attributed to the increased levels of dissolved oxygen, which inhibited the activity of methanogens. High-throughput sequencing revealed that the enrichment of Geobacter might drive the Feammox process, leading to improved nitrogen removal. The efficient phosphorus removal relied on chemical precipitation, with a possible contribution from Dechloromonas. In conclusion, the 30% ESB ratio synergistically improved pollution control and GHG mitigation through combined physicochemical effects and microbial interactions. This study demonstrates ESB’s potential for sustainable wastewater treatment with minimized climate impact.
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