The upflow anaerobic sludge blanket (UASB) reactor can be considered as one of the promising anaerobic wastewater treatment technologies suitable for the treatment of high-strength wastewater. In the recent period, researchers have focused on the treatment of low-strength wastewater using this technology. This review focuses on the key factors affecting the reactor performance such as hydraulic retention time (HRT), temperature, organic loading rate (OLR), pH and alkalinity, granulation, wastewater characteristics, mixing, and modification to conventional configuration. Start-up and granulation played a major role in the determination of reactor performance, and various theories have been proposed to understand the mechanism of granulation. Correlation between start-up time and OLR was found to be low, as other operating parameters might have been influencing the start-up time. Flowchart depicting the development of UASB reactor over time is included. In the present work, further development and derivatives of the UASB reactor such as static granular bed reactor (SGBR) and expanded granular sludge bed (EGSB) reactor are analyzed. The optimal conditions for UASB for treating various types of substrates was found to be HRT of 3-24 h, OLR of 1-15 kg COD/m /d, and operational temperature in mesophilic range (30-40°C). Analysis of various modifications that pave the way for identification of future areas of research to improve reactor performance is also presented.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/wer.1665 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparative efficacy of anaerobic digestion systems in removing antimicrobial resistance genes from swine wastewater.
J Hazard Mater
December 2024
Technology Innovation Center for Food Safety Surveillance and Detection (Hainan), Sanya Institute of China Agricultural University, Sanya 572025, China; National Key Laboratory of Veterinary Public Health Safety, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China. Electronic address:
Swine farm wastewater is a major reservoir of antimicrobial resistance genes (ARGs). Anaerobic digestion (AD), widely implemented in farms, has been extensively studied for ARG removal. However, a comparative study on ARG removal efficiency across the four principal AD systems - up-flow anaerobic sludge blanket (UASB), continuous stirred tank reactor (CSTR), buried biogas digester (BBD), and septic tank (SPT) - is lacking.
View Article and Find Full Text PDFAssessment of reactor configurations and key factors for enhanced anammox-based nitrogen removal.
Chemosphere
February 2025
School of Infrastructure, Indian Institute of Technology Bhubaneswar, Jatni, Argul, Odisha, 752050, India.
Wastewater treatment processes are continually evolving to meet stringent environmental standards while optimizing energy consumption and operational costs. With significant advantages over more traditional approaches, the anammox process has become a hopeful substitute for nitrogen removal. The objective of this work was to evaluate upflow anaerobic sludge blanket reactor (UASBR), moving bed biofilm reactor (MBBR), and sequential batch reactor (SBR) among diverse reactor configurations, in culturing anammox bacteria and achieving nitrogen removal efficiencies.
View Article and Find Full Text PDFAn inconvenient impact: Unveiling the overlooked differences in crystalline forms of iron (hydro)oxides on anaerobic digestion.
Water Res X
January 2025
CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Technology, University of Science and Technology of China, Hefei 230026, China.
Iron (hydro)oxides are commonly used to enhance anaerobic digestion due to their cost-effectiveness and versatility. However, the influence of crystalline structure on digestion performance is often overlooked despite their unique characteristics. In this study, we investigated how different crystalline forms of FeOOH affect substrate utilization, sludge activity, and the microbiomes in up-flow anaerobic sludge blanket (UASB) reactors.
View Article and Find Full Text PDFImpact of chemical oxygen demand to nitrogen ratio on ANAMMOX bacterial growth in an up-flow anaerobic sludge blanket reactor.
Water Sci Technol
December 2024
Institute for Water and Wastewater Technology, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa E-mail:
While several studies have investigated the effect of varying carbon-to-nitrogen (C/N) ratios on the ANAMMOX performance, there is still a research gap in illustrating the shift in 16S rRNA gene copy number and functional microbial population during operation. Hence, this study focuses on utilizing a reference gene and target functional genes to demonstrate the synergetic interaction between ANAMMOX, ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB), using an up-flow anaerobic sludge blanket (UASB) under different C/N conditions. It was demonstrated that elevating the C/N ratio from 1.
View Article and Find Full Text PDFEnhancing synthetic vinasse treatment efficiency using an integrated UASB-Modified Bardenpho Process.
Bioresour Bioprocess
December 2024
Department of Civil and Environmental Engineering, Faculty of Engineering, University of Birjand, P.O.Box: 97175/615, Birjand, Iran.
Vinasse poses considerable environmental problems due to its complex composition of organic matter, minerals, and toxic compounds. If discharged into the environment without treatment, it can cause adverse impacts on ecosystems. This research investigated the effectiveness of an integrated treatment system involving an upflow anaerobic sludge blanket (UASB) reactor and the modified Bardenpho process (MBP) for purifying synthetic vinasse.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!