School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China; Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland.
School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China; Hong Kong Hua Yi Design Consultants (S.Z.) LTD., Shenzhen, 518057, China.
Chemosphere. 2021 May;270:129460. doi: 10.1016/j.chemosphere.2020.129460. Epub 2020 Dec 31.
Nitrogen removal is often limited in municipal wastewater treatment due to the insufficiency of carbon source, and using food wastes fermentation liquid as carbon source could cut down the cost of operating and recycle food wastes. Food wastes fermentation liquid production and application as external carbon source were explored in the laboratory and full-scale system in this study. In the laboratory scale, lactic acid and VFAs were the main components of fermentation liquid, and the highest total chemical oxygen demand (TCOD) production was obtained with activated sludge as inoculum. The yield of TCOD was around 794.5 mg/g TS and NH-N was 3.5 mg/g TS. The denitrification rate with fermentation liquid was slightly lower than acetic acid and butyric acid, but higher than lactic acid and starch. In the full-scale investigation, the TCOD concentration in fermentation liquid was in the range of 6.9-12.8 g/L and the ratio of TCOD/inorganic nitrogen was 210.5-504.5:1. NO-N removal increased from 52.1% to 94.2% after fermentation liquid addition, confirming the potentiality of food wastes fermentation liquid replace the commercial carbon source in wastewater treatment plants.
由于碳源不足，城市污水处理中常常受到氮去除的限制，而利用食物废物发酵液作为碳源可以降低运营成本并实现食物废物的回收利用。本研究在实验室和全规模系统中探索了食物废物发酵液的生产和应用作为外加碳源。在实验室规模下，发酵液的主要成分是乳酸和 VFAs，以活性污泥为接种物时可获得最高的总化学需氧量（TCOD）产量。TCOD 的产率约为 794.5mg/g TS，NH-N 为 3.5mg/g TS。与乙酸和丁酸相比，发酵液的反硝化速率略低，但高于乳酸和淀粉。在全规模调查中，发酵液中的 TCOD 浓度范围为 6.9-12.8g/L，TCOD/无机氮的比例为 210.5-504.5:1。添加发酵液后，NO-N 的去除率从 52.1%增加到 94.2%，证实了食物废物发酵液在污水处理厂替代商业碳源的潜力。
