A green process for total nitrogen removal without extra energy consumption: Synergistic actions for wastewater treatment.
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75% confidenceThis MES study investigates Carbon neutrality, Energy consumption, Microalgae. The research focuses on system optimization and characterization.
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Abstract
Total nitrogen (TN) removal is one of the key issues in improving water quality, while the traditional nitrification-denitrification process with its high energy consumption is unsustainable, due to greenhouse gas (GHG) emission. A method using organic-inorganic pellets and selected microalgae that can operate without electricity consumption was designed for TN removal in actual wastewater treatment. The results showed that the TN removal efficiencies with different pellets were 88.2 % ± 2.2 %, 86.6 % ± 3.0 %, 85.4 % ± 4.3 %, and 82.3 % ± 6.5 %, respectively. Microalgae assimilated inorganic nitrogen within cells, resulting in a significant positive relationship with TN (P < 0.05), and effectively removed TN through sedimentation. The pellets adsorbed nitrogen and microorganisms, released organic substances to regulate the ratio of water chemical oxygen demand (COD) to TN, and correspondingly influenced microbial growth. Microalgae and bacteria such as Romboutsia, Proteiniclasticum, and Rhodopseudomonas cooperated to form a mixed aerobic (water) -anaerobic (pellets) environment in the devices, and acted synergistically to remove TN. This study verifies the feasibility of TN removal with only solar energy in a low flow application in large spaces, benefiting carbon neutrality in wastewater treatment.