Anaerobic sequencing batch reactors and its influencing factors: an overview

Area of Science:

• Environmental Engineering
• Biotechnology
• Chemical Engineering

Background:

• Anaerobic sequencing batch reactors (ASBRs) utilize a cyclic process involving feed, reaction, settling, and discharge.
• These reactors facilitate biological anaerobic metabolism, converting substrates into methane and carbon dioxide.
• Variable substrate concentrations within the cycle enhance microbial activity, biomass flocculation, and settling.

Purpose of the Study:

• To provide a comprehensive overview of the anaerobic sequencing batch reactor (ASBR) process.
• To examine the key factors influencing the operational performance of ASBRs.
• To highlight the advantages of ASBRs in wastewater treatment and biogas production.

Main Methods:

• Review of existing literature on anaerobic sequencing batch reactor technology.
• Analysis of the operational principles and cyclic steps of ASBRs.
• Discussion of factors affecting substrate conversion, biogas production, and sludge settling.

Main Results:

• ASBRs exhibit high substrate conversion rates due to fluctuating concentrations.
• Efficient biomass flocculation and settling are achieved, allowing the reactor to function as a decanter.
• The batch operation decouples solids residence time from hydraulic retention time, simplifying operation.

Conclusions:

• ASBRs offer an efficient and flexible approach to anaerobic digestion and biogas production.
• Optimizing cycle frequency and duration is crucial for maximizing reactor performance.
• The ASBR process presents a viable technology for wastewater treatment with potential for resource recovery.