Aeration control in membrane bioreactor for sustainable environmental footprint. (April 2020)

• Record Type: Journal Article
• Authors: Mannina, Giorgio; Cosenza, Alida; Rebouças, Taise Ferreira
• Is Part Of: Bioresource technology. Volume 301(2020)
• Publication Date: 2020-04
• Subjects: Membrane bioreactor -- Aeration-based control strategy -- Proportion-integration control; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.122734
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Two-step cascade control strategies have been applied to MBR. An integrated MBR mathematical model has been adopted. Energy consumption reduces till to 82% controlling the aerobic airflow rate. Operating cost reduces till 64% controlling the aerobic airflow rate. Direct GHG emission reduces from 0.52 to 0.47 kgCO2eq m −3 under control condition. Abstract: In this study different scenarios were scrutinized to minimize the energy consumption of a membrane bioreactor system for wastewater treatment. Open-loop and closed-loop scenarios were investigated by two-step cascade control strategies based on dissolved oxygen, ammonia and nitrite concentrations. An integrated MBR model which includes also the greenhouse gas formation/emission processes was applied. A substantial energy consumption reduction was obtained for the closed-loop scenarios (32% for Scenario 1 and 82% for Scenario 2). The air flow control based on both ammonia and nitrite concentrations within the aerobic reactor (Scenario 2) provided excellent results in terms of reduction of operating cost reduction (64%), direct (10%) and indirect (81%) emissions.