Performance Evaluation and Dissolved Oxygen Effect in Deep-bed Denitrification Filter: a Full-scale Plant Case Study

5th Annual International Conference on Material Science and Environmental Engineering

材料科学;生态环境科学

Hu, Xiang^1 ; Hu, Jie^1 ; Wu, Ke^1 ; Hou, Hongxun^1

Anhui Guozhen Environmental Protection Sci. AndTech. Co. Ltd., Anhui Province Hefei

230088, China^1

关键词: Denitrification filters;    Dissolved oxygen effect;    DO concentration;    Full-scale plants;    Performance evaluations;    Process configuration;    Removal efficiencies;    Total phosphorus;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/301/1/012112/pdf
DOI  :  10.1088/1757-899X/301/1/012112

来源: IOP

【 摘 要 】

The aims of this study were twofold. Firstly, the denitrificaion performance in deep-bed denitrificaiton filter (DBDF), serving as the advanced total nitrogen (TN) and total phosphorus (TP) removal technology, was evaluated. Secondly, the effect of dissolved oxygen (DO) into the DBDF on both the denitrificaion performance and the external carbon source addition was investigated. The operational results over eight months demonstrated good TN removal efficiency (87.8%) in the studied full-scale plant, in which 70.7% and 17.1% of TN were removed in the pre-denitrifation in oxidation ditch and post-denitrifation in DBDF, respectively. The DO concentration was inversely related to both the external carbon source dosage and the nitrate removed in DBDF. A dose of 3.60Kg methane (97%) was required to remove 1Kg nitrate, with approximately 26.2% of methane dosed was depleted by the DO in DBDF influent. It is suggested to take some measures to eliminate or mitigate the waterfall reoxygenation at process configurations before the DBDF, which is expected to save the cost of external carbon source.