Removal performance and dissolved organic matter biodegradation characteristics in advection ecological permeable dam reactor

ABSTRACT

In this present study, an advection ecological permeable dam (AEPD) based on a biofilm reactor was established to investigate pollution control performance and dissolved organic matter (DOM) bio-degradation. The AEPD achieved optimal efficiency—chemical oxygen demand, 6–53 mg/L; total nitrogen concentration, 1.47–6.89 mg/L; total phosphorus concentration, 0.53–3.93 mg/L, and increases in values for ultraviolet–visible parameters—SUVA₂₅₄, from 0.392 to 0.673–1.438; E4/E6, from 1.09 to 1.11–1.26; A_240–400, from 12.06 to 13.09–19.95; and A_253–203, from 0.03 to 0.04-0.23. This showed that DOM degradation promoted its humification, aromatisation, and unsaturation as well as increased the number of polar functional groups in the organic aromatic rings of DOM. Synchronous fluorescence and parallel factor analyses indicated that AEPD could effectively degrade tyrosine-like and tryptophan-like compounds, which showed the most significant decrease in fluorescence intensity. Additionally, AEPD displayed some stable dominant bacterial genera (e.g. Proteobacteria_unclassified, Bacteroidetes_unclassified, Gemmobacter, Pseudofulvimonas, Flavobacterium, Pseudomonas, and Nitrospira), although their relative abundance differed under variable hydraulic loading rates. This research provided further technical support for the application of AEPD in the treatment of water environment pollution.

GRAPHICAL ABSTRACT

KEYWORDS:

• Advection ecological permeable dams
• dissolved organic matter
• microbial community
• pollutant removal rate
• fluorescence components

Acknowledgement

This work is supported by National Water Pollution Control and Management Technology Major Project (2018ZX07110005), the National Natural Science Foundation of China (52170097), the Fundamental Research Funds for Beijing University of Civil Engineering and Architecture (X18288, X18289 and X20137).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials.

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [Grant Number 52170097]; Fundamental Research Funds for Beijing University of Civil Engineering and Architecture: [Grant Number X18288, X18289 and X20137]; National Water Pollution Control and Management Technology Major Project: [Grant Number 2018ZX07110005].