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Evaluation of different air dosing strategies to enhance H 2 S removal in microaerobic systems treating low-strength wastewaters

Authors
  • Sousa, MR
  • Oliveira, CJS
  • Jade Muller Carneiro
  • Lopes, AC
  • Rodríguez, E
  • Vasconcelos, EAF
  • Holanda, GBM
  • Landim, PGC
  • Silva, MER
  • Firmino, PIM
  • Dos Santos, AB
Type
Published Article
Journal
Environmental Technology
Publisher
Informa UK Limited
Publication Date
Jun 22, 2018
Volume
40
Issue
28
Pages
3724–3734
Identifiers
DOI: 10.1080/09593330.2018.1487470
PMID: 29888986
Source
MyScienceWork
License
White

Abstract

This study aimed to evaluate different air dosing strategies such as microaeration flow rates and air dosing points to enhance H2S removal in microaerobic systems treating low-strength wastewaters. Efficiency and stability of the reactors, as well as biogas quality, were assessed, and microbial community changes were evaluated using the PCR-DGGE technique. The results showed that the air dosing point affected the H2S concentration and that air dosing at the headspace promoted the highest H2S removal efficiency. The airflow rate also affected the process, since H2S concentration in the biogas was higher at 0.1 mL air.min-1 than at 0.3 mL air.min-1. The methane concentration in the biogas was also affected by both air dosing point and flow rate, since the lowest value was observed at the highest airflow rate of the headspace dosing point, due to dilution by the N2 influx applied to the system. The highest productivity and operational efficiency were observed at this air dosing point, with this airflow (HD0.3), which corroborates with the operational results and the ecological parameters, since the microaeration at this stage promoted high bacterial and archaeal species richness and diversity, optimum functional organization, high COD and H2S removal efficiencies.

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