Ngo, Nam

Dr. Ngo is a program manager, research at DC Water who has been leading research team at DC Water day by day.

Titles from this speaker

Description: Developing Approaches for Achieving Biological Phosphorous Removal and Improved...

Developing Approaches for Achieving Biological Phosphorous Removal and Improved Settleability in High-rate Activated Sludge Systems

Abstract

This study focuses on determining the minimum SRT maintaining significant bio-P activity, quantifying phosphorus removal methods, and evaluating sludge settling. This paper offers practical guidance on the implementation of HRAS systems for determining the actual bio-P phosphate removal through parallel contact stabilization assimilation reactors.

This work demonstrates that bio-P activity washed out of aerobic SRT of 1.2-1.8 day. Overall, about 56% of P removal was achieved through bio-P while the rest was achieved through assimilation. This study showed the need for developing strategies for SRT uncoupling to selectively retain PAOs in high-rate system to potentially achieve P removal and improved overall capacity of high-rate system through improving settling.

SpeakerNgo, Nam

Presentation time

11:30:00

12:00:00

Session time

10:30:00

12:00:00

SessionHealthy As A Horse? Assessing Bio-P Stability

Session locationRoom S403a - Level 4

TopicFacility Operations and Maintenance, Intermediate Level, Municipal Wastewater Treatment Design, Nutrients

Author(s)

Ngo, Khoa Nam

Author(s)K. Ngo 1; C. Lee 2 ; H. Truong 3; E. Kin 2; S. Fuentes 4; C, Chen 3 ; G. Wells 5; H. De Clippeleir 6; C. Lee 2;

Author affiliation(s)District of Columbia Water and Sewer Authority 1; District of Columbia Water and Sewer Authority, Northwestern University 2 ; District of Columbia Water and Sewer Authority, Northwestern University 3; District of Columbia Water and Sewer Authority, Northwestern University 2; District of Columbia Water and Sewer Authority 4; District of Columbia Water and Sewer Authority 3 ; District of Columbia Water and Sewer Authority 5; 6; 2;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159176

Volume / Issue

Content sourceWEFTEC

Word count16

Improving Clarifier Models by Describing Extracellular Polymeric Substances

Abstract

Improved settleability in activated sludge processes is an essential feature of new innovations. To accelerate the adoption of such technologies, the ability to link operational conditions with settling characteristics is needed to support process design and prediction of improvements in settleability. The previous works indicated that the threshold of flocculation (TOF) (Mancell-Egala et al., 2017a), which describes the collision efficiency of particles, was successfully introduced as a simple experimental method to calculate the flocculent settling coefficient (rp) in 1-D clarifier models and to enhance the ability to predict clarifier effluent solids. TOF also showed to have a clear relationship with effluent quality making it a useful operational parameter to detect flocculation limitations. In addition, extracellular polymeric substances (EPS) quality, most often expressed as a protein over polysaccharides ratio has been linked to flocculation behavior, densification and granulation (McSwain et al., 2005). This knowledge was used to develop an empirical function between the composition of (EPS) expressed as EPS-TKN/COD and TOF. This relationship between EPS composition and TOF was introduced as a means of linking biological process models (i.e. Sumo2C model) and 1-D clarifier models (Ngo et al., 2021b). Essential for this approach is the prediction of EPS amounts and quality from process models as a function of feast-famine, and other operational conditions as this defines settling behavior. This paper discusses three approaches for EPS prediction from process models and will provide insights on 2 which type of EPS modeling might be needed for different purposes. While this abstract describes different datasets tested for the different models, the full paper will provide a full comparison of the three models on the full-scale dataset collected at Blue Plains

This paper discusses three approaches for EPS prediction from process models and will provide insights on which type of EPS modeling might be needed for different purposes. With optimized EPS quality prediction, it is possible to simulate settling improvements based on changes in operational conditions both based on a wide range of SRT as well as based on feast-famine driver. The latter will help to accelerate the adoption of intensification technologies.

SpeakerNgo, Nam

Presentation time

10:35:00

10:50:00

Session time

10:30:00

12:00:00

SessionPushing the Boundaries of Our Biological Models

Session locationRoom S404a - Level 4

TopicFacility Operations and Maintenance, Intermediate Level, Municipal Wastewater Treatment Design, Research and Innovation

Author(s)

Ngo, Khoa Nam

Author(s)N. Khoa Nam 1; T. Wadhawan 2 ; B. Sturm 3; J.P. Boltz 4; J. Hinojosa 5; A.N. Massoudieh 6; I. Takacs 7; J. Jimenez 8; H. De Clippeleir 9;

Author affiliation(s)District of Columbia Water and Sewer Authority 1; Dynamita SARL, France 2 ; University of Kansas 3; Woodard & Curran Arizona State University, USA 4; District of Columbia Water and Sewer Authority 5; Catholic University of America 6; Dynamita SARL, France 7; Brown and Caldwell, USA 8; District of Columbia Water and Sewer Authority, USA 9;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159190

Volume / Issue

Content sourceWEFTEC

Word count9

Description: Improving Clarifier Performance and Capacity through Full-scale Implementation of...

Improving Clarifier Performance and Capacity through Full-scale Implementation of High-rate Contact Stabilization

Abstract

When combined with carbon efficient nutrient removal systems (short-cut nitrogen removal), high-rate activated sludge (HRAS) systems provide a potential pathway towards energy neutrality at Water Resource Recovery Facilities (WRRFs) (Rahman et al., 2020). In well operated HRAS systems, 50-60% of influent wastewater COD can be captured and sent to anaerobic digestion through carbon redirection and enhanced settling in clarifiers. Carbon redirection depends on short solids retention time (SRT) to minimize aerobic oxidation while solids capture in clarifiers is a function of bioflocculation (Jimenez et al., 2015; Rahman et al., 2016). However, the operational conditions of HRAS system can lead to a very dynamic process resulting in inconsistent clarifier performance and poor effluent quality, which in turn, reduces the net COD captured and energy recovery through anaerobic digestion (Miller et al., 2016). The secondary treatment or HRAS system at Blue Plains Advanced WWTP in Washington, DC operates at 1to 3 days SRT. The secondary clarifier performance is positively impacted when the HRAS system is bioaugmented with waste sludge from the downstream, enhanced nitrogen removal (ENR) system, and negatively impacted by recycle from the solids thickening and dewatering processes. Bioaugmentation with ENR sludge allows for better settling characteristics through improved bioflocculation (Mancell-Egala et al., 2017b; Van Winckel et al., 2019) and reduced energy demand through increased oxygen transfer efficiency (Garrido-Baserba et al., 2020). On the other hand, the solids recycle flow (solids processing building return flow, or SPB) has high levels of colloidal material that cannot settle without being adsorbed onto flocs and thus increases fines in the secondary effluent (Mancell-Egala et al., 2017b; Van Winckel et al., 2019). Previous research at Blue Plains showed that biofloculation in HRAS systems is the limiting factor in achieving good effluent quality, especially with high colloidal loads coming from the solids recycle flow (Mancell-Egala et al., 2017b; Van Winckel et al., 2019). The same studies showed that extraccellular polymeric substances (EPS) production was the critical factor impacting flocculation properties and settling characteristics. High-rate Contact Stabilization (CS) or RAS aeration has shown to enhance EPS production and bioflocculation by imposing a feast-famine regime (Rahman et al., 2016). It was therefore suggested that a high-rate CS system rather than a high-rate step-feed system (current configuration) should allow for enhanced bioflocculation within the Blue Plains secondary treatment system. Full-scale CS implementation was easy to implement to the current existing infrastructure at Blue Plains as it only required to bypass feed flow to the later stages to allow for a RAS aeration zone or stabilization zone to be created (Figure 1). Overall, this study focused on evaluating the impact and potential benefits of full-scale high-rate CS implementation, including the complexities of bioaugmentation and SPB flows on settling behavior and clarifier performance.

The following conference paper was presented at WEFTEC 2021, October 16-20, 2021. To read the full abstract, see "Abstract" tab below.

SpeakerNgo, Nam

Presentation time

16:00:00

16:20:00

Session time

16:00:00

17:30:00

SessionSecondary Clarifier Treatment Performance

Session number117

TopicFacility Operations and Maintenance, Municipal Wastewater Treatment Design

Author(s)

Nam Ngo

Author(s)N. Ngo1,2; M. Sabur1; A. Massoudieh2; B. Wett4; C.B. Bott3; N.J. Passarelli1; A. Tesfaye1; R. Suzuki1; C. deBarbadillo1; H. De Clippeleir1;

Author affiliation(s)District of Columbia Waterand Sewer Authority, DC1Department of Civiland EnvironmentalEngineering, Catholic University of America, DC2Hampton Roads Sanitation District3ARA consult GmbH, AU4

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2021

DOI10.2175/193864718825158017

Volume / Issue

Content sourceWEFTEC

Word count13

Description: Mitigating Volatile Sulfur Compound Emission From Primary and Secondary Activated...

Mitigating Volatile Sulfur Compound Emission From Primary and Secondary Activated Sludge Systems Using New Low-Cost Operational Strategies

Abstract

INTRODUCTION
Since the early twentieth century, treatment plants have typically been located at remote locations on the outskirts of the cities they serve. Due to an increase in population size, urbanization, life standard and irrigation needs, the demand for water and wastewater treatment plants (WWTP) has been rising rapidly (Estrada et al., 2011). As a result, large WWTPs are often found near main metropolitan areas, so the need for odor prevention increased accordingly. A critical factor in facilitating the integration of intensified WWTP within urbanized regions is cost-effective and efficient odor emissions prevention, control, and treatment. For decades, research and technologies have been focused on the treatment of foul air from treatment processes providing end-of-pipe solutions for volatile sulfur compound (VSC) removal that results in higher capital and operational costs to utilities (Giri et al., 2014). Technologies developed include physical-chemical approaches that can remove H2S as well as biological approaches (i.e. biofilters and trickling filters) that can also remove volatile organic sulfur compounds (VOSCs) (Camp Dresser & McKee, 2003). Treatment and cost-effectiveness of these end-of-pipe approaches are mainly dependent on the ease to capture the foul air and, therefore mostly applied for sewer networks, screening and grit removal facilities, and biosolids storage facilities. However, one of the significant sources of nuisance odor emission within WWTP is the primary and secondary treatment system, which is mainly caused by VOSC emission rather than H2S (Sekyiamah et al., 2008). Due to the low odor threshold of VOSCs such as methyl mercaptan (MM), dimethyl sulfide (DMS), dimethyl disulfide (DMDS) compared to H2S (Estrada et al., 2011), the smaller fluxes observed within WWTP and in particular within secondary systems can have a significant impact on the overall nuisance odor emission. Due to its large surface area, the end-of-pipe odor treatment technologies often require significant capital investment and are often impractical.
In this project, we proposed new operational strategies for low-cost odor mitigation in both primary treatment systems and secondary activated sludge systems based on a better understanding of odor production kinetics. For the primary treatment system, a new sludge pumping mode was proposed to minimize compression and retention of sludge blankets. For the secondary system, a switch was made from a step feed mode with anaerobic selectors to a high-rate contact stabilization mode with aerobic stabilizer and contactor with anaerobic selectors. The achieved odor reduction through these approaches is presented in this paper.
MATERIALS AND METHODS
Sampling campaign: An AC'SCENT surface Emission Isolation Flux Chamber (Bazemo et al., 2021) was used for gas phase sampling at the surface of primary clarifiers and the different passes and zones in secondary reactor system. The VOSCs off-gas samples were sent to ALS Environmental Laboratory to be analyzed for MM, DMS, and DMDS (ALS, USA). H2S measurements were carried out using an electrochemical sensor (Odalog, USA). The influent and sludge characterizations were captured. Historical measurements using the same sampling methods were used as a baseline for the secondary system, while different operational modes were compared side by side for the primary system. Developing and evaluating new operational mode for primary clarifier: Three modes were tested at different underflow rates detailed in Figure 1. It should be noted that mode 1 and mode 3A & 3B alternated every two cycles on one clarifier for short-term testing and were tested side by side during steady-state period. As both modes ran in parallel on the same day, the impacts of wastewater characteristics and temperature on odor production outcomes between modes were minimized. Full-scale high-rate CS implementation in secondary system: West and East secondary full-scale activated sludge systems at Blue Plains were switched from stepfeed to CS configuration on April 7th, 2020 and August 1st, 2020 respectively (Figure 1B & 1C). More details on how this switch improved secondary performance can be found in Ngo et al., 2021.
RESULTS & DISCCUSIONS
Primary system odor production decreased by more than a half using a new pumping strategy: The proposed strategy was based on the reports from Bazemo et al. (2021), showing 64% of H2S and 89% VOCS emissions were produced in the sludge blankets. Figure 2A & 2B indicated that mode 3A and 3B resulted in significantly lower H2S and VOSC emissions compared to mode 1. Minimizing the sludge buildup time was more important than increasing the sludge pump flow rate, as no clear differentiation between mode 3A and 3B was observed. Thus, the total primary sludge pump flow rates from each house could be maintained while minimizing potential odor generation from further thickening. The steady-state operation showed that with this low-cost operation change, a reduction of 57% of H2S and 63% of VOSC was feasible (Figure 2C and 2D). In addition, this new mode maintains H2S levels under 1.6 ppm (2.2 ppm baseline) and 46 ppbv VOSC (111 ppbv baseline). Bioaugmentation and Contact stabilization (CS) mode decreased VSC emission by 23% and 81%, respectively: In secondary treatment, VOSC is the main contributor of odor and the only H2S emitted comes from primary effluent stripping (Bazemo et al., 2021). In addition, off-gas testing during baseline testing showed that 78% of odor emission in secondary was related to the first pass and production of odor compounds in sludge blankets and anaerobic zones. In addition, kinetic experiments using batch testing showed an evident inhibition of VOSC production due to nitrate (Figure 3A) or oxygen (Figure 3B) presence. Bioaugmentation using biological nutrient removal (BNR) sludge into secondary systems has been demonstrated to improve nutrient removal, oxygen transfer efficiencies, and settleability (Ngo et al., 2021). Due to the nitrate production of 0.43 mg/L-N, when one of the secondary systems receives all BNR sludge during the summer months, VOCSs emission was reduced by 23% with double bioaugmentation scenario (Fig. 3C). When both secondary systems receive each half of the BNR sludge, such levels of nitrate cannot be achieved and VOSCs emission increased again, while benefits of oxygen transfer and settleability were maintained (Fig.3C). When CS mode was applied, and bioaugmentation was maintained at 50%, VOSC reduced by 83% (Figure 3C) and H2S production decreased by 75%, despite the lack of net nitrate production. As larger part of the sludge inventory is stored under aerobic conditions rather than under anaerobic conditions, overall emission was clearly reduced.
CONCLUSION
This study developed new operational strategies in primary and secondary systems to mitigate the VSC emissions by minimizing the anaerobic sludge inventory without impacting performance in the primary or even improving overall system performance in the secondary Ngo et al. (2021). By understanding odor production kinetics, low-cost operational strategies can offer an alternative to end-of-pipe odor treatment technologies with significant capital investment costs.

Intensified WWTP within urbanized regions is cost-effective and efficient odor emissions prevention, control, and treatment. This study developed new operational strategies in primary and secondary systems to mitigate the VSC emissions by minimizing the anaerobic sludge inventory without impacting performance. By understanding odor production kinetics, low-cost operational strategies can offer an alternative to end-of-pipe odor treatment technologies with significant capital investment costs.

SpeakerNgo, Nam

Presentation time

09:00:00

09:15:00

Session time

08:30:00

10:00:00

TopicIntermediate Level, Facility Operations and Maintenance, Odors and Air Quality, Sustainability and Climate Change

Author(s)

Ngo, Nam

Author(s)Khoa Nam Ngo1,2; Margaret Lan-Anderson1,3; William Albrittain1; Chris J. Reilly1; Ryu Suzuki1; Arash Massoudieh2; Nicholas Passarelli1; Aklile Tesfaye1; George Wells3; Haydée De Clippeleir1

Author affiliation(s)District of Columbia Water and Sewer Authority, Washington, DC1; The Catholic University of America, Washington, DC2; Northwestern University Library, Evanston, IL3

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2022

DOI10.2175/193864718825158520

Volume / Issue

Content sourceWEFTEC

Word count18

Description: Towards More Reliable Dewatering Performance by Optimizing Polymer Dose...

Towards More Reliable Dewatering Performance by Optimizing Polymer Dose Decision-making

Abstract

Blue Plains Advanced wastewater treatment plant (AWWTP) was the first utility in the USA to install Cambi thermal hydrolysis process (THP) together with anaerobic digester (AD) to reduce solids production, increase energy resource recovery and produce class A biosolids. The new facilities were commissioned at the Blue Plains Advanced Wastewater Treatment Plant (AWTP) in 2015. The technology choice provided a major benefit on dewatering process by improving the cake TS, which has a large economic impact on treatment operations by decreasing the hauling costs, and by improving the quality of the "Bloom” biosolids product that is regionally marketed (Li, 2021). Dynamic changes in operational condition of the THP and AD process, sludge characteristics, and seasonal impacts (Li, 2021) result in high variety of cake TS (%) from 24 to 38% TS and filtrate TSS from 50 to 1530 mg TSS/L at the final dewatering belt filter presses. Poor cake TS causes higher hauling costs, while unreliable filtrate TSS significantly impacts the filtrate treatment facility. In addition, the polymer cost also may increase year by year depending on the market price, so picking the right optimal polymer dose range can optimize operational cost. In practice, the polymer dose is set manually by the operator and requires constant attention to minimize polymer dose while maintaining good operational throughput. Polymer dose decision making is thus mainly driven by human factors. Therefore, this study focused on investigating if the polymer dosing decision made by operators is adequate or if there is room to improve dewatering performance, which helps to define research development needs for helping optimizing polymer costs at the plant.

Our team finished a first evaluation of the full-scale final dewatering process at Blue Plains and found that currently about 30% of the time the operator is overdosing polymer. Operating the system at the Eco-PD will allow for polymer dose savings while stabilizing cake and filtrate quality. In addition, acoustic signals before and after polymer dose and flocculation will be used to develop a feedforward feedback polymer dose control. Current development is ongoing.

SpeakerNgo, Nam

Presentation time

14:30:00

14:50:00

Session time

13:30:00

15:00:00

SessionUpgrading and Optimizing Thickening and Dewatering

Session locationRoom S401a - Level 4

TopicIntermediate Level

Author(s)

Ngo, Khoa

Author(s)K. Ngo 1; T. Nguyen 2 ; H. Nguyen 3; D. Dao 2; J. Proctor 3; A. Tesfaye 4; D. Adalian 4; A. Massoudieh 5; N. Passarelli 4; H. De Clippeleir 6; K. Ngo 1;

Author affiliation(s)DC Water 1; Catholic University of America 2 ; Catholic University of America 3; Catholic University of America 2; DC Water 3; DC Water 4; DC Water 4; DC Water 5; DC Water 4; DC Water 6; DC Water 1;

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2023

DOI10.2175/193864718825159234

Volume / Issue

Content sourceWEFTEC

Word count11

Description: Validation Of The Novel Settling Prediction Model Framework For Various Full-Scale...

Validation Of The Novel Settling Prediction Model Framework For Various Full-Scale Systems

Abstract

INTRODUCTION
A clear trend towards intensified and resource-efficient technologies is observed as wastewater treatment plants are moving towards resource recovery facilities. Given that current secondary clarifiers are often the largest footprint bottleneck to achieve intensification, improving settleability, clarifier capacity, and effluent quality have become an essential feature of new technologies (Ekama et al., 1997). Recently, Ford et al. (2018) and Sturm & De Clippeleir (2020) described different degrees of settling improvements using the inDENSE technology based on a combination of physical (cyclones) and microbial selection (Bio-P and plug flow configurations). However, it was unclear how easily transferrable the latter observations were to other plants as the effects of operational conditions on settleability are challenging to estimate and extrapolate to new systems. Unlike the use of physical and microbial selection for shortcut nitrogen removal, where kinetic measurements or molecular tools help to quantify selection or selective wasting (Van Winckel et al., 2019), no clear quantification for settling selection is available, and thus transferability of results is challenging.
In previous work, the threshold of flocculation (TOF) (Mancell-Egala et al., 2017a), describing the collision efficiency of particles, was successfully introduced as a simple experimental method to calculate the flocculent settling coefficient (rp) in one-dimensional (1D) clarifier models and enhanced the ability to predict clarifier effluent solids (Ngo et al., 2021a; Figure 1). TOF also showed to have a clear relationship with effluent quality making it a useful operational parameter to detect flocculation limitations. Besides that, a strong correlation was found between the composition of extracellular polymeric substances (EPS) expressed as EPS-TKN/COD and TOF. The relationship between EPS composition and TOF was introduced as a means of linking biological process models (Sumo2C model) and 1D clarifier models (Ngo et al., 2021b; Figure 1). The latter model framework (Figure 1) shows the potential to predict settling behavior from operational conditions and would open up opportunities to extrapolate concepts from one facility to another. Preliminary validation using literature data showed settling trends related to solids retention time changes well. However, full validation using full-scale wastewater, process, and settling data was missing. In this study, we are filling this gap by detailed monitoring of three activated sludge systems at Blue Plains (two secondary contact stabilization systems, one biological nutrient removal system). In addition, sampling at five additional full-scale locations is initiated and will be added to the full paper to gain confidence that the proposed model framework is generally applicable. Two major validations are aimed for (1) validation of the two empirical equations (Figure 1) and (2) validation that process models can predict settling changes in full-scale systems based on operational conditions.
MATERIALS AND METHODS
Two high-rate secondary systems and one biological nutrient removal systems were samples for at least six months consisting of wastewater characteristics, flocculation settling, Vesilind parameters, and sludge composition including EPS. Similar measurement at five additional full-scale systems is initiated to generate similar data set for a broader range of operational conditions and systems. At least two of the full-scale systems include hydrocyclone selection. Empirical equations were validated directly from data (EPS~TOF) or using steady-state clarifier modeling (rp~TOF). Data gathered was then used to set up and calibrate the Sumo2C model (Hauduc et al., 2019) and validate predicted TOF and clarifier performance with the observed dataset. The latter action is ongoing and will be fully reported in the full paper.
RESULTS AND DISCUSSIONS
Validation of empirical equations A wide range of full-scale activated sludge systems was selected for validation to test the potential global applicability. Two years of validation data (2020 and 2021) from EAST and WEST secondary systems at Blue Plains were sampled (Figure 2 and Table 1). In addition, each secondary system was operated under different configurations including stepfeed (SF) and contact-stabilization mode (feast-famine) mode. Besides that, another five new full-scale WWTPs are sampled later this year to include larger variability in SRT, effluent quality, organic loading, and reactor configurations. Initial testing results are presented in figure 1B and 1D. Despite the significant differences in operational conditions of the systems, all validation data fell well within 95% prediction interval of the training data that was established based on stepfeed secondary system and BNR systems at Blue Plains systems (Figure 1). This confirmed that the developed equations are valid and transferrable. Process model-based prediction of settling behavior The overall model concept and an example of the model setup for the two secondary systems at Blue Plains are shown in Figure 1. This step included a detailed and longer-term sampling of full-scale systems, including detailed wastewater characterization (Table 1) to allow dynamic process models of the latter systems, in addition to the settling behavior and EPS (Figure 3). First, a steady-state model run will be aimed to get a sense of TOF prediction of the model, and this phase will be followed by dynamic modeling of the more than six-month period to see how well the model can pick up changes in settling over time. Both the stepfeed mode and contact stabilization mode will be simulated, which in practice resulted in improved settling behavior (Figure 2). The latter is a good example of operational condition change within one system. In addition to that, sampling campaigns within five additional full-scale systems are ongoing, which will provide a broader view of the applicability of the modeling framework. We believe that this work can be a gamechanger in approaching settleability and settling predictions.
CONCLUSION
This is the first time that process conditions were directly linked to settleability in a way model prediction of settling improvements based on changes in operational conditions are made possible. The power of the proposed settling prediction model is being validating this study based on eight full-scale systems. It brings us one step closer to a practical approach for enhancing the ability to predict clarifier effluent quality and performance as a result of operational and wastewater changes.

To accelerate the adoption of new innovations, the ability to link operational conditions with settling characteristics is needed to support process design. This study is the first time that process conditions were directly linked to settleability in a way model prediction of settling improvements based on changes in operational conditions are made possible. It brings us one step closer to a practical approach for enhancing the ability to predict clarifier effluent quality and performance.

SpeakerNgo, Nam

Presentation time

14:30:00

14:55:00

Session time

13:30:00

15:00:00

TopicAdvanced Level, Municipal Wastewater Treatment Design, Nutrients, Research and Innovation

Author(s)

Ngo, Nam

Author(s)Khoa N. Ngo1,2; Jose Jimenez3; Tanush Wadhawan4; Arash Massoudieh2; Aklile Tesfaye1; Imre Takács4; Haydée De Clippeleir1

Author affiliation(s)District of Columbia Waterand Sewer Authority, Washington, DC1; Catholic University of America2; Brown and Caldwell, Florida3; Dynamita SARL, Sigale,France4

SourceProceedings of the Water Environment Federation

Document typeConference Paper

PublisherWater Environment Federation

Print publication date Oct 2022

DOI10.2175/193864718825158670

Volume / Issue

Content sourceWEFTEC

Word count13