[A comparison between a submerged membrane bioreactor and a conventional activated sludge process].

¹ESPC State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.

|August 18, 2001

Summary

A submerged membrane bioreactor (MBR) offers superior effluent quality compared to conventional activated sludge (CAS) processes. While MBR initially showed soluble microbial product accumulation, microbial acclimation led to degradation, demonstrating its effectiveness in wastewater treatment.

Area of Science:

Environmental Engineering
Biotechnology
Water Treatment

Background:

Conventional activated sludge (CAS) processes are widely used but can have limitations in effluent quality.
Submerged membrane bioreactors (MBRs) offer an alternative with potential for improved performance.

Purpose of the Study:

To compare the performance of MBR and CAS under similar operational conditions.
To evaluate effluent quality, organic matter composition, and operational characteristics of both systems.

Main Methods:

Direct comparison of MBR and CAS systems operating under identical conditions.
Analysis of effluent chemical oxygen demand (COD).
Characterization of organic matter composition (macromolecules and small molecules) in different process streams.

Main Results:

MBR demonstrated significantly lower average effluent COD (55.5 mg/L) compared to CAS (79.7 mg/L).
MBR showed initial accumulation of soluble microbial products due to membrane interception, which was later degraded with microbial acclimation.
Organic matter composition differed, with MBR permeate primarily containing small molecules (< 3,000 MW), unlike CAS effluent and MBR supernatant.

Conclusions:

MBR provides more stable and excellent effluent quality than CAS.
Microbial acclimation is crucial for managing soluble microbial product accumulation in MBRs.
MBR's smaller floc size enhances oxygen transfer rates, contributing to its efficiency.

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Purpose of the Study:

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Main Results:

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