Poster Sessions

While interactions between canonical nitrifiers have been investigated extensively, the extent to which comammox bacteria interact with canonical nitrifiers is as yet not well understood. The objectives of this study were to determine if comammox bacteria and canonical nitrifiers exhibit concentra...

Active assimilators of soluble microbial products in wastewater anammox processes Rui Xiao1, Shaoyi Xu1, Huijie Lu1*1Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental Resource Sciences, Zhejiang University, 310058, Hangzhou, China* e-ma...

Context. Changes in drinking water treatment can affect the biofilm in the drinking water distribution system (DWDS) and enhanced monitoring is recommended to guarantee drinking water safety after substantial process modifications. Ultrafiltration was introduced in 2016 to the drinking water treatm...

Context. Biofilm formation in drinking water distribution systems (DWDS), which leads to numerous operational problems, i.e. secondary water contamination, pipe degradation and increased flow resistance, is influenced by many factors. Among these, surface characteristics, and thus pipe materials, ha...

Global population will reach 10 billion by 2050, threatening food security and fresh water resources due to discharges of organic micropollutants (OMPs). Circular solutions enable efficient resource use, but pose risks due to OMP recirculation. This study presents a membrane-aerated bioreactor (MABR...

Sewage surveillance of the new SARS-CoV-2 virus, also referred to as Wastewater-based Epidemiology (WBE), has started to be utilized as a tool to support clinical epidemiology and for the overall understanding of disease spread. Weekly wastewater samples were collected from two treatment plants in S...

Context. Recent progress in on-line microbiological measurement instruments has allowed real-time monitoring of drinking water distribution systems (DWDSs), uncovering microbiological dynamics and empowering the development of early-warning systems.Gap. While these instruments have become more comm...

Context. To retain slow growing bacteria, biofilms are commonly used in biological nitrogen removal of wastewater treatment. One of these processes is partial nitritation-anammox (PNA), where ammonia-oxidizing bacteria (AOB) and anammox bacteria coexist in the biofilm.Gap. Studies on biofilm bioreac...

Context. Ultrapure water factory in Emmen (Netherlands) utilizes Biological Oxygen-dosed Activated Carbon (BODAC) filters to produce ultrapure water from wastewater. BODAC filters comprised of a series of five pre- and post-filters, regularly flushed with oxygen, and have been continuously operated ...

Intermittent water supply (IWS), the provision of potable water non-continuously, leads to periods of stagnation with conditions favorable for biofilm growth. Regular repressuring of pipes at the beginning of each supply cycler has been shown to shear off biofilms from pipewalls and transfer inhabit...

Context. Granular sludge exhibits unique features, thus being a favorable platform for the cultivation of slow-growing microorganisms, such as anammox and nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO) microorganisms.Gap.While granular anammox processes have been widely applied, lit...

Context. Realizing energy-efficient biological nitrogen removal requires strategies that maintain consistent modulation of nitrifying populations within the activated sludge microbiome to cease the oxidation of ammonium at nitrite. Gap. Engineering strategies designed to out-select nitrite oxidiz...

ContextHigher pressure on water sources, combined with more frequent droughts, potentially calls for a different view on wastewater, and for increased reuse. To achieve a reusable water, a safe removal of pathogens is needed. GapGranular activated carbon (GAC) is commonly used for drinking water tr...

Context and gap: Biofilm formation on a biocarrier surface is a complex process which is not only determined by characteristics of supporting media but also affected by the type of microorganisms, initial inoculum concentration, and extracellular polymers production. Polyurethane (PU) is one of the...

Candidatus Accumulibacter was the first microorganism identified as polyphosphate-accumulating organism (PAO), essential for phosphorus removal from wastewater. However, the lineage is quite diverse and clearly comprises multiple species. The current taxonomic framework is flawed, with the majority...

Context. The discovery of complete ammonia oxidation (comammox) bacteria has challenged the paradigm of the classical two-step nitrification. Comammox bacteria are widely distributed in wastewater treatment plants, accounting for 0.02-0.57% of the bacterial community.They exhibited relative...

Context. Activated sludge process, which is a biological wastewater treatment process, has a history of over 100 years, and has been also applied for the treatment of coke-oven wastewater discharged from steelmaking industry. Recent advances in molecular approach such as next-generation sequencing t...

The Saprospiraceae family is a very diverse family within the phylum Bacteroidetes, commonly present in high abundance in wastewater treatment plants (WWTPs) worldwide, such as the genus OLB8, but little is known about their function and importance. The genera described are characterized by rod-shap...

Context. Non-enzymatic structural proteins called amyloid adhesins are present in activated sludge.Gap. We hypothesize that the (strong) binding forces within activated sludge microcolonies are due to adhesin-like interactions.Aim. Identify operating conditions that stimulate or repress adhesin e...

Due to the impact that pollution generates, especially due to the presence of pharmaceutical type traces in wastewater, it is necessary to develop and optimize biological treatment systems that are able to remove these pollutants and control the impacts that have been unleashed in natural environmen...

Context. The performance of activated sludge systems is dependent on the growth kinetics of core microbial community (Saunders et al. 2016). To date, the design of many wastewater treatment plants (WWTPs) in the tropics are adopting default growth kinetic parameters from the temperate climate reg...

Due to widespread use of antibiotics in food production, it is highly likely that various antibiotic resistance genes (ARGs) are present in food waste.While a number of studies on ARGs fate other organic waste treatments exist, food waste as an ARG source remains understudied.In this study, the fate...

Assembling genomes from metagenomic short-read data can be challenging due to sequencing errors, depth of sequencing coverage and the unknown and uneven complexity of microbial communities. Reconstructing high-quality genomes is a crucial part of the metagenomic workflow as subsequent ecological and...

The production of lactic acid (HLa) has attracted a great deal of attention due to its widespread applications in food, chemical, cosmetic, plastic and pharmaceutical industries. HLa is produced from glucose derived from starchy materials, which impacts its production cost and competes with food sup...

Context. The anaerobic digesters have potential to produce 14,000 TWh from currently available feedstocks, corresponding to 6-9 % of the world's energy consumption. Gap. While the gas-producing microbiota are well described and understood, little is known about the hydrolysing microorganisms, alt...

Context. SARS-CoV-2 wastewater-based epidemiology (WBE) has been advanced as a relevant indicator of distribution of COVID-19 in communities, supporting classical testing and tracing epidemiological approaches.Gap. Up to now, there are not many studies on a large geographical scale combining severa...

Context. Slow sand filtration (SSF) is widely used in drinking water treatment plants (DWPTs) as a cost-effective and safe approach to remove contaminants like particles, organic matter and microorganisms from drinking water. The removal primarily occurs in the top layer of the mature sand bed, kno...

Understanding the changes in microbial communities from source to tap water after water stagnation is important for process control and risk management. However, little information is available on the fate of microbial communities from source to tap water after stagnation. This study aims to evaluat...

Context. Mainstream nitritation in municipal wastewater treatment is challenging, due to the low bulk ammonium concentrations and low temperatures. It is especially challenging for biofilm processes, where NOB are more easily retained.Gap. Hydroxylamine addition has been proposed as a solution bec...

Context. Success of the partial nitration/anammox (PNA) process relies on a balance of the microbial guilds of aerobic (AOB) and anaerobic ammonia oxidizing bacteria (AnAOB) as well as the suppression of nitrite oxidizing bacteria (NOB). Heterotrophic bacteria (HB) often constitute a large portion ...