Fabrizio Sabba

Fabrizio Sabba
Black & Veatch

Ph.D.

About

41
Publications
13,322
Reads
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535
Citations
Additional affiliations
January 2018 - August 2021
Northwestern University
Position
  • PostDoc Position
August 2010 - August 2016
University of Notre Dame
Position
  • PhD Student

Publications

Publications (41)
Article
Full-text available
Wastewater treatment plants can be significant sources of nitrous oxide (N2O), a potent greenhouse gas. However, little is known about N2O emissions from biofilm processes. We adapted an existing suspended-growth mathematical model to explore N2O emissions from nitrifying biofilms. The model included N2O formation by ammonia-oxidizing bacteria (AOB...
Article
Full-text available
Biological denitrification typically requires the addition of a supplemental electron donor, which can add a significant operating expense to wastewater treatment facilities. Most common electron donors are organic, but reduced inorganic sulfur compounds (RISCs), such as sulfide (HS−) and elemental sulfur (S0), may be more cost-effective. S0 is an...
Article
Full-text available
This paper discusses the microbial basis and the latest research on nitrous oxide (N2O) emissions from biofilms processes for wastewater treatment. Conditions that generally promote N2O formation in biofilms include (1) low DO values, or spatial DO transitions from high to low within the biofilm; (2) DO fluctuations within biofilm due to varying bu...
Article
Elemental sulfur (So ) can serve as an electron donor for water and wastewater denitrification, but few researchers have addressed the kinetics of So -based reduction of nitrate (NO3- ), nitrite (NO2- ), and nitrous oxide (N2 O). In addition, So -based denitrifying biofilms are counter-diffusional. This is because the electron donor (So ) is suppli...
Preprint
Full-text available
While enhanced biological phosphorus removal (EBPR) is widely utilized for phosphorus (P) removal from wastewater, understanding of efficient process alternatives that allow combined biological P removal and shortcut nitrogen (N) removal, such as nitritation-denitritation, is limited. Here, we demonstrate efficient and reliable combined total N, P,...
Article
The Wisconsin Rapids Wastewater Treatment Plant (WRWWTP) is faced with a more stringent effluent phosphorus requirement that will drive capital investment between 2020 and 2025. The facility will need to achieve a monthly average value of 0.36 mg L⁻¹ of total phosphorus (TP). While the facility has sufficient influent carbon to drive a conventional...
Article
Nitrous oxide (N2O) is a potent greenhouse gas that can be produced by nitrifying and denitrifying bacteria. Yet the effects of N2O on microbial communities is not well understood. We used batch tests to explore the effects of N2O on mixed denitrifying communities. Batch tests were carried out with acetate as the electron donor and with the followi...
Article
Simultaneous nitrification-denitrification (SND) is an advantageous bioprocess that allows the complete removal of ammonia nitrogen through sequential redox reactions leading to nitrogen gas production. SND can govern nitrogen removal in single-stage biofilm systems, such as the moving bed biofilm reactor (MBBR) and aerobic granular sludge (AGS) sy...
Article
Implementing an aerobic digestion step after anaerobic digestion, referred to as “post aerobic digestion” (PAD), can remove ammonia without the need for an external carbon source and destroy volatile solids. While this process has been documented at the lab‐scale and full‐scale, the mechanism for N removal and the corresponding microbial community...
Article
Full-text available
Nutrient management is a critical issue for Water Resource Recovery Facilities, and sidestream treatment technologies to reduce nutrient loads often focus on liquid sidestream and require external carbon sources. Post...
Chapter
Full-text available
With increased commitment from the international community to reduce greenhouse gas (GHG) emissions from all sectors in accordance with the Paris Agreement, the water sector has never felt the pressure it is now under to transition to a low-carbon water management model. This requires reducing GHG emissions from grid-energy consumption (Scope 2 emi...
Article
Nitrate (NO3-) contamination of groundwater is a worldwide issue that poses great threats to human health due to the use of the groundwater source for drinking water production. Among the...
Article
Full-text available
The wastewater treatment sector embraces mixed-culture biotechnologies for sanitation, environmental protection, and resource recovery. Bioprocess design, monitoring and control thrive on microbial processes selected in complex microbial communities. Microbial ecology...
Article
Granular biofilms are dense spherical complex biological systems comprised mainly of multi-microbial cells, water, and extracellular polymeric substances (EPS). They facilitate efficient purification and settling of activated sludge in wastewater treatment processes. Biofilm viscoelastic properties are characteristics of the complex system that con...
Article
Full-text available
Water bodies often suffer from the discharge of nutrient loading from agricultural and urban areas that compromises the quality of water. This study presents the application of the Hotelling test to evaluate the impacts of treated wastewater, discharged from a municipal wastewater treatment plant (WWTP), on the quality of river water. The quality o...
Article
Polyelectrolyte complex (PEC) materials show promise in the development of tunable membranes for aqueous and organic solvent separations, as well as in the creation of surface layers for fouling control. In this study, we developed a polyelectrolyte complex (PEC) functionalized by negatively charged carboxymethyl chitosan (CMC-) and positively char...
Article
Reducing the solids retention time (SRT) of the enhanced biological phosphorus removal (EBPR) process can increase organic carbon diversion to the sidestream for energy recovery, thereby realizing some of the benefits of the high rate activated sludge (HRAS) process. Determining the washout (i.e. minimum) SRT of polyphosphate accumulating organisms...
Article
Full-text available
Groundwater contamination is an ever-growing environmental issue that has attracted much and undiminished attention for the past half century. Groundwater contamination may originate from both anthropogenic (e.g., hydrocarbons) and natural compounds (e.g., nitrate and arsenic); to tackle the removal of these contaminants, different technologies hav...
Article
Batch kinetic assays of DPAO-enriched biomass reveal elevated kinetics when nitrite is supplied for P uptake, but extremely slow kinetics for reduction of the potent greenhouse gas nitrous oxide.
Preprint
Full-text available
Groundwater contamination is an ever-growing environmental issue that has attracted much and undiminished attention for the past half century. Groundwater contamination may originate from both anthropogenic (e.g., hydrocarbons) and natural compounds (e.g., nitrate and arsenic); to tackle the removal of these contaminants, different technologies hav...
Article
While enhanced biological phosphorus removal (EBPR) is widely utilized for phosphorus (P) removal from wastewater, understanding of efficient process alternatives that allow combined biological P removal and shortcut nitrogen (N) removal, such as nitritation-denitritation, is limited. Here, we demonstrate efficient and reliable combined total N, P,...
Article
Microbial granular biofilms are spherical, multi-layered aggregates composed of communities of bacterial cells encased in a complex matrix of hydrated extracellular polymeric substances (EPS). While granular aggregates are increasingly used for applications in industrial and municipal wastewater treatment, their underlying mechanical properties are...
Article
Recent findings show that a subset of bacteria affiliated with Nitrospira, a genus known for its importance in nitrite oxidation for biological nutrient removal applications, are capable of complete ammonia oxidation (comammox) to nitrate. Early reports suggested that they were absent or present in low abundance in most activated sludge processes,...
Article
Wastewater treatment plants (WWTPs) are among the major anthropogenic sources of N2O, a major greenhouse gas and ozone-depleting agent. We recently devised a zero-energy zero-carbon biofiltration system easily applicable to activated sludge-type WWTPs and performed lab-scale proof-of-concept experiments. The major drawback of the system was the dim...
Article
Biofilms are soft multicomponent biological materials composed of microbial communities attached to surfaces. Despite the crucial relevance of biofilms to diverse industrial, medical, and environmental applications, the mechanical properties of biofilms are understudied. Moreover, most of the available techniques for the characterization of biofilm...
Article
Full-text available
The presented study involved designing a computer model of a sequencing batch reactor (SBR) at laboratory scale. The data pertaining to the technical aspects of the bioreactor and quality indicators of wastewater constituted the input for the employed simulation tool, i.e. GPS-X software package. The results of a simulation involving a 12-hour oper...
Article
Full-text available
Wastewater treatment processes are subject to numerous disturbances during biological treatment of wastewater. In order to achieve and sustain suitable conditions of the process, basic wastewater parameters should be frequently monitored. While great improvements have been made in the automatization of treatment process, little is known about autom...
Article
Full-text available
Nitrous oxide (N2 O) is a potent greenhouse gas that can be formed in wastewater treatment processes by ammonium oxidizing and denitrifying microorganisms. While N2 O emissions from suspended growth systems have been extensively studied, and some recent studies have addressed emissions from nitrifying biofilms, much less is known about N2 O emissio...
Conference Paper
Full-text available
One-dimensional (1-D) biofilm models have been demonstrated reliable for specific types of biofilm reactor design. Limitations using mechanistic biofilm models for engineering design do not rely on improved biofilm models, but rely on improved biofilm reactor models. This is important when considering that biofilm reactors containing submerged, fre...
Article
Full-text available
Wastewater treatment plants can be significant sources of nitrous oxide (N2O), a potent greenhouse gas. While our understanding of N2O emissions from suspended-growth processes has advanced significantly, less is known about emissions from biofilm processes. Biofilms may behave differently due to their substrate gradients and microbial stratificati...
Article
Full-text available
Nitrous oxide (N2O) is a powerful greenhouse gas emitted from wastewater treatment, as well as natural systems, as a result of biological nitrification and denitrification. While denitrifying bacteria can be a significant source of N2O, they can also reduce N2O to N2. More information on the kinetics of N2O formation and reduction by denitrifying b...
Article
Full-text available
In this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of reject water from wastewater treatment plant was evaluated. For the bioaugmentation step a product containing an enrichment of microorganisms from the Archaea domain was used to enhance the performance of the reactor for treating reject water. The experiment...
Conference Paper
Full-text available
Wastewater treatment plants can be a significant source of nitrous oxide (N2O), a potent greenhouse gas. While researchers have addressed N2O emissions from suspended-growth processes, little is known about the emissions from biofilm processes. Biofilms may behave differently due to substrate gradients and microbial stratification. We explored N2O...
Conference Paper
Full-text available
Wastewater treatment plants (WWTPs) engaging in biological nutrient removal (BNR) including nitrification and denitrification can be a significant source of nitrous oxide (N2O) emissions. Most studies on N2O emission from BNR processes have explored suspended-growth systems. Few studies have addresses biofilm processes. This study used mathematical...
Article
Wastewater treatment plants (WWTPs) engaging in biological nutrient removal (BNR) including nitrification and denitrification can be a significant source of nitrous oxide (N 2O) emissions. Most studies on N 2O emission from BNR processes have explored suspended-growth systems. Few studies have addresses biofilm processes. This study used mathematic...
Article
Nitrous oxide is a potent greenhouse gas that can be formed in wastewater treatment, and there is increasing interest in its fate in treatment processes. In this research, kinetic parameters and denitrification-gene expression levels were determined for Paracoccus pantotrophus, a common denitrifying bacterium. Batch tests were carried out with acet...
Conference Paper
Full-text available
Many utilities are seeking more cost effective, safe, and reliable electron donors for biological nutrient removal (BNR). Elemental sulfur (S°) may be an attractive option, but little is known about the feasibility of S°-based denitrification and its kinetics. In this research, we used bench–scale, S° packed–bed reactors to determine denitrificatio...

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