Preparation of a highly biocompatible powder carrier and its application in high concentration composite powder carrier bio-fluidized bed (HPB)

CHEN Jin; WANG Chengxian; MU Yue; CHAI Xiaoli

doi:10.13205/j.hjgc.202501011

Volume 43 Issue 1

Mar. 2025

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CHEN Jin, WANG Chengxian, MU Yue, CHAI Xiaoli. Preparation of a highly biocompatible powder carrier and its application in high concentration composite powder carrier bio-fluidized bed (HPB)[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 97-106. doi: 10.13205/j.hjgc.202501011

Citation:

CHEN Jin, WANG Chengxian, MU Yue, CHAI Xiaoli. Preparation of a highly biocompatible powder carrier and its application in high concentration composite powder carrier bio-fluidized bed (HPB)[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 97-106. doi: 10.13205/j.hjgc.202501011

Citation:

CHEN Jin, WANG Chengxian, MU Yue, CHAI Xiaoli. Preparation of a highly biocompatible powder carrier and its application in high concentration composite powder carrier bio-fluidized bed (HPB)[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 97-106. doi: 10.13205/j.hjgc.202501011

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Preparation of a highly biocompatible powder carrier and its application in high concentration composite powder carrier bio-fluidized bed (HPB)

doi: 10.13205/j.hjgc.202501011

1. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;
2. Hunan Sanyou Environmental Protection Co., Ltd., Changsha 410205, China

Received Date: 2024-03-14
Accepted Date: 2024-06-25
Rev Recd Date: 2024-05-29

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

Abstract

In addressing the challenge of low nitrogen removal efficiency in wastewater treatment plants under low-temperature conditions, this study undertook a comprehensive comparison of pollutant removal efficiency, sludge extracellular polymeric substances (EPS), and microbial community structure. This comparison focused on two treatment systems: the high-concentration composite powder bio-fluidized (HPB) system and the anaerobic-anoxic-oxic (AAO) process. The basis for this comparison was rooted in the detailed physical and chemical characterization of the PY@DE composite powder carrier materials utilized within the HPB system. The results of this investigation unequivocally indicated that the incorporation of the PY@DE composite powder carrier into the HPB system significantly enhanced its overall performance metrics. Specifically, the average total nitrogen (TN) concentration reached 6.85 mg/L, a level considerably lower than the Class A Discharge Standard stipulated in the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB 18918—2002). Moreover, the HPB system demonstrated an average TN removal rate of an impressive 89%, which represents a substantial improvement over the performance of the AAO process by a notable margin of 14%. Key factors contributing to the superior performance of the HPB system include the exceptional properties of the PY@DE composite powder carrier. This carrier exhibited a contact angle of 14.6°, which is indicative of its favorable wettability, coupled with an interfacial adsorption free energy of 46.28 mJ/m². These properties are essential for enhancing interaction with wastewater constituents, thereby facilitating efficient adsorption and subsequent removal of nitrogenous compounds. Furthermore, the introduction of the composite powder carrier positively influenced the microbial community structure within the HPB system. It selectively enriched populations of nitrogen-removing bacteria, notably Dokdonella, Rhodobacter, and Hydrogenophaga, which are crucial for effective nitrogen degradation. These findings collectively suggest that the PY@DE composite powder carrier not only possesses excellent biocompatibility, which is instrumental in fostering the growth of beneficial microorganisms, but also enhances biofilm stability. This stability is particularly vital for maintaining high nitrogen removal efficiency, especially under challenging low-temperature conditions that typically hinder microbial activity. Ultimately, the insights derived from this study advocate for the integration of advanced bio-carrier materials, such as the PY@DE composite, into wastewater treatment methodologies to significantly improve nitrogen removal efficiencies.
- biological fluidized bed,
- composite powder carrier,
- biological affinity,
- interfacial adsorption free energy,
- biological nitrogen removal

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References

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