Biofilm-based simultaneous nitrification, denitrification, and phosphorous uptake in wastewater by Neurospora discreta

Journal article


Ahmed, A., Tabraiz, S., N.M.Aiswarya, Taneja, H. and R. Aravinda Narayanan 2022. Biofilm-based simultaneous nitrification, denitrification, and phosphorous uptake in wastewater by Neurospora discreta . Journal of Environmental Management. 324, p. 116363. https://doi.org/10.1016/j.jenvman.2022.116363
AuthorsAhmed, A., Tabraiz, S., N.M.Aiswarya, Taneja, H. and R. Aravinda Narayanan
Abstract

Biological removal of nitrogen and phosphorous from wastewater conventionally involves multiple processing steps to satisfy the differing oxygen requirements of the microbial species involved. In this work, simultaneous nitrification, denitrification, and phosphorous removal from synthetic wastewater were achieved by the fungus Neurospora discreta in a single-step, biofilm-based, aerobic process. The concentrations of carbon, nitrogen, and phosphorous in the synthetic wastewater were systematically varied to investigate their effects on nutrient removal rates and biofilm properties. Biofilm growth was significantly (p < 0.05) affected by carbon and nitrogen, but not by phosphorous concentration. Scanning electron microscopy revealed the effects of nutrients on biofilm microstructure, which in turn correlated with nutrient removal efficiencies. The carbohydrate and protein content in the biofilm matrix decreased with increasing carbon and nitrogen concentrations but increased with increasing phosphorous concentration in the wastewater. High removal efficiencies of carbon (96%), ammonium (86%), nitrate (100%), and phosphorus (82%) were achieved under varying nutrient conditions. Interestingly, decreasing the phosphorus concentration increased the nitrification and denitrification rates, and decreasing the nitrogen concentration increased the phosphorus removal rates significantly (p < 0.05). Correlations between biofilm properties and nutrient removal rates were also evaluated in this study.

KeywordsFungal biofilms; Simultaneous nitrification and denitrification; Phosphorous removal; Wastewater treatment
Year2022
JournalJournal of Environmental Management
Journal citation324, p. 116363
PublisherElsevier
ISSN0301-4797
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jenvman.2022.116363
Official URLhttps://www.sciencedirect.com/science/article/pii/S0301479722019363
FunderLeverhulme Trust
Publication dates
Online05 Oct 2022
Publication process dates
Accepted22 Sep 2022
Deposited06 Oct 2022
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