Nitrogen removal performance and bacterial communities in zeolite trickling filter under different influent C/N ratios

Abstract

In this study, the degradation performance of nutrients in zeolite trickling filter (ZTF) with different influent C/N ratios and aeration conditions was investigated. Microaeration was beneficial for enhancing NH 4 + -N removal performance. Due to the sufficient carbon source supply under a C/N ratio of 8, a high removal efficiency of NH 4 + -N and TN was simultaneously observed in ZTF. In addition, TN removal mainly occurred at the bottom, which might be explained by the sufficient nutrients available for bacteria to multiply in this zone. The abundant genera were Acinetobacter, Gemmobacter, Flavobacterium, and Pseudomonas, all of which are heterotrophic nitrification-aerobic denitrification (HNAD) bacteria. In addition, biofilm only slowed down the adsorption rate but did not significantly reduce the adsorption capacity of zeolite. Bio-zeolite had NH 4 + -N well adsorption capacity and bio-desorption capacity. Biological nitrogen removal performance was superior to physicochemical absorption of zeolite. The results suggested that the physicochemical of zeolite and biochemical reactions of microorganism coupling actions may be the main nitrogen transformation pathway in ZTF. Our research provides a reference for further understanding the nitrogen removal mechanism of zeolite bioreactors.

Ecological filter walls for efficient pollutant removal from urban surface water

“…At the same time, Acinetobacter (5.5%), Paracoccus (2.0%), and Pseudomonas (5.9%) were found in EFW to simultaneously oxide organic matter and oxide ammonia to nitrite and nitrate, which were denitrified to N 2 under the aerobic condition [ [49] , [50] , [51] , [52] ]. For instance, Gu et al.…”

Synergistic Removal of Nutrient Pollutants and Pharmaceutical and Personal Care Products (PPCPs) from Contaminated Groundwater: Macro- and Microelements and Microorganisms

“…The TN removal rate increased by 31.9% in system E compared to system A, as a joint result of the zeolite substance layer and electrolysis. Electrolysis could prolong the service life of zeolite and enhance the biological regeneration by affecting the ionexchange process and biochemical reactions of microorganisms, which can achieve the sustainable utilization of zeolite and reduce the operation cost of system E. 12 TN removal rates increased throughout the experimental period (120 days) of system E, from 45.6 ± 20.4% (phase I) to 90.4 ± 1.6% (phase III), and the effluent TN concentration reduced to 2.7 mg/L, consistently meeting the standards for drinking water quality (GB 5749-2006) (Table S9). 13 NO 3 − -N removal performance was similar to that of TN during the entire period (Figure 1d).…”

Effect of Aeration and External Carbon Source on Nitrogen Removal and Distribution Patterns of Related-Microorganisms in Horizontal Subsurface Flow Constructed Wetlands

“…Likewise, the relative abundance of Actinobacteria in the CW_C treatment also significantly decreased at both the fore and rear ends of HSSFCWs. Previous studies indicated that Actinobacteria and Acidobacteria were key species in the transformation of carbon and nitrogen in CWs [42]. Earlier research had noted that Acidobacteria was involved in litter decomposition [43], while Actinobacteria played a role in the process of denitrification [24].…”