中文版 | English
CSpace
Microalgae biofilm photobioreactor and its combined process for long-term stable treatment of high-saline wastewater achieved high pollutant removal efficiency
Fan, Gaozhong1; Huang, Jie1; Jiang, Xin1; Meng, Weile1; Yang, Rui1; Guo, Jinsong1; Fang, Fang1; Yang, Jixiang2
2023-12-01
摘要High-saline wastewater treatment processes have a high energy demand, while microalgae-driven wastewater biotechnology is both economical and environmentally friendly, and the use of microalgae to treat high-saline wastewater can effectively reduce energy consumption. However, it is unclear whether the performance of microalgae reactor can be stable for a long time. In this study, an open continuous-flow biofilm photobioreactor using Dunaliella salina was innovatively constructed, and operated in combination with a membrane bioreactor (MBR) for high-saline wastewater treatment. The purpose of this study was to investigate the long-term per-formance of MBR, MBPBR alone and their combined operation for the removal of organic matter, phosphorus and nitrogen, explore the pathway and mechanism of nitrogen and phosphorus removal by MBPBR, and evaluate the feasibility of MBPBR-MBR integrated system for the treatment of saline wastewater. The MBR effectively removed most of the organic matter and converted ammonia nitrogen into nitrate nitrogen, which is a preferred nitrogen source for the growth of Dunaliella salina, thereby providing favorable water quality for Dunaliella salina in the subsequent MBPBR. The MBPBR, with a hydraulic retention time (HRT) of 72 h, achieved a NO3--N removal load of 74.9 g N/(m3 center dot d) and a removal efficiency of approximately 60 %, and the PO43--P removal load of 8.33 g P/(m3 center dot d) and removal efficiency of over 80 %. The MBR-MBPBR system demonstrated long-term stability, achieving removal efficiencies of 84.3 %, 81.6 %, and 91.0 % for COD, TN and PO43--P, respectively. Within the MBPBR, the growth of algae and their assimilation contributed 44.9 % and 38.7 % of the nitrogen and phos-phorus removal, respectively. The abundance of Dunaliella salina in the MBPBR remained at approximately 90 % for over 40 days of operation, providing an opportunity for Dunaliella salina recovery. These findings provide valuable insights into the utilization of microalgae for the treatment of high-salinity wastewater, while also supporting the practical implementation of microalgae-based treatment methods for such wastewater.
关键词Dunaliella salina Membrane bioreactor (MBR) Microalgae biofilm photobioreactor (MBPBR) Nutrients removal Low energy consumption
DOI10.1016/j.jece.2023.111473
发表期刊JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
ISSN2213-2929
卷号11期号:6页码:9
通讯作者Fang, Fang(fangfangcq@cqu.edu.cn) ; Yang, Jixiang(jixiang.yang@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001114969500001
语种英语