High rate simultaneous nutrients removal in a single air lift bioreactor with continuous feed and intermittent discharge regime: Process optimization and effect of feed characteristics

Azar Asadi, Ali Akbar Zinatizadeh, Mark Van Loosdrecht

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

In this research, continuous feed and intermittent discharge air lift bioreactor (CFIDAB) was evaluated under two independent variables to treat milk processing wastewater (MPW). The effect of HRT (6-14 h) and air flow rate (1-3 l/min) on the performance of CFIDAB was studied in a laboratory scale of the bioreactor. The optimum values of HRT and air flow rate were 10 h and 3 l/min, reaching SCOD, TN, and TP removal efficiency around 98%, 85%, and 78%, respectively. The results showed that TP and TN removal were enhanced simultaneously with an increase in HRT and air flow rate. Oxidation-reduction potential (ORP) measurement at the optimal condition showed the successful occurrence of anaerobic, anoxic, and aerobic zones in the CFIDAB. Moreover, the effect of feed characteristics on the process performance for milk processing and soft drink wastewaters was investigated. Based on the obtained data, CFDIAB operated with soft drink wastewater (SDW) showed a better performance in removal of carbon and phosphorus compounds, while nitrogen content was removed more efficient for MPW. As a result, the performance of CFIDAB is sensitive to BOD5/COD ratio of wastewater. Overall, this single compartment air-lift bioreactor could act as an efficient biological nutrient removal system, providing the conditions for good carbon and nutrient removal. It showed an excellent reactor geometry as well as operating strategy to be used as a membrane bioreactor.

Original languageEnglish
Pages (from-to)200-209
Number of pages10
JournalChemical Engineering Journal
Volume301
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • Airlift bioreactor
  • Biological nutrient removal
  • Milk processing wastewater (MPW)
  • Single bioreactor
  • Soft drink wastewater (SDW)

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