Details

Autor(en) / Beteiligte

• Lian, Xiaoyan
• Wang, Zhangbao
• Liu, Zhuochao
• Xiong, Zhensheng
• Dai, Huihui
• Yang, Liming
• Liu, Yuanqi
• Yang, Jia
• Geng, Yanni
• Hu, Minkang
• Shao, Penghui
• Luo, Xubiao

Titel

A new microalgal negative carbon technology for landfill leachate treatment: Simultaneous removal of nitrogen and phosphorus

Ist Teil von

• The Science of the total environment, 2024-10, Vol.948, p.174779, Article 174779

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Replete with ammonia nitrogen and organic pollutants, landfill leachate typically undergoes treatment employing expensive and carbon-intensive integrated techniques. We propose a novel microalgae technology for efficient, low-carbon simultaneous treatment of carbon, nitrogen, and phosphorus in landfill leachate (LL). The microbial composition comprises a mixed microalgae culture with Chlorella accounting for 82.58%. After seven days, the process with an N/P ratio of approximately 14:1 removed 98.81% of NH4+-N, 88.62 % of TN, and 99.55% of TP. Notably, the concentrations of NH4+-N and TP met the discharge standards, while the removal rate of NH4+-N was nearly three times higher than previously reported in relevant studies. The microalgae achieved a removal efficiency of 64.27% for Total Organic Carbon (TOC) and 99.26% for Inorganic Carbon (IC) under mixotrophic cultivation, yielding a biomass of 1.18 g/L. The treatment process employed in this study results in a carbon emissions equivalent of −8.25 kgCO2/kgNremoved, representing a reduction of 33.56 kgCO2 compared to the 2AO + MBR process. In addition, shake flask experiments were conducted to evaluate the biodegradability of leachate after microalgae treatment. After microalgae treatment, the TOCB (Biodegradable Total Organic Carbon)/TOC ratio decreased from 56.54% to 27.71%, with no significant improvement in biodegradability. It establishes a fundamental foundation for further applied research in microalgae treatment of leachate. [Display omitted] •Mixed microalgae dominated by Chlorella rapidly remove NH4+-N at 75.58 mg/L/d.•Mixotrophic microalgae cultivation achieved 64.27% TOC and 99.26% IC removal.•The biodegradability of leachate did not increase after microalgae treatment.•Microalgae treatment markedly reduces carbon emissions to −8.25 CO2/kgNremoved.