Assessment of sludge management strategies in wastewater treatment systems using a plant-wide approach

Flores-Alsina, Xavier; Ramin, Elham; Ikumi, David; Harding, Theo; Batstone, Damien J.; Brouckaert, C.J.; Sotemann, Sven; Gernaey, Krist V.

doi:10.1016/j.watres.2020.116714

Cited by 33 publications

(13 citation statements)

References 67 publications

(33 reference statements)

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“…A model study conducted in South Africa found using a centralized sludge management technique with thermal pretreatment and AD resulted in 36.5% conversion of COD in the influent into methane and 41 and 65% N and P in the biosolids, respectively. This is a substantial improvement from the disposal practice utilized in the study, which was landfilling (Flores-Alsina et al, 2021).…”

Section: Compostingmentioning

confidence: 99%

“…Pyrolysis is an inexpensive and robust procedure that has shown promise as a treatment tool for raw biosolids by generating a liquid and solid stream that can be used for liquid fuels and soil amendment, respectively (Callegari & Capodaglio, 2018). Thermal hydrolysis prior to (an)aerobic digestion or composting has been reported to increase feedstock biodegradability, solids loading capability (9 vs. 6%), and biosolid dewaterability, all while maintaining a better energy balance (Flores-Alsina et al, 2021). The high temperatures and pressures of pyrolysis improve the soil quality through the inactivation of pathogens, thereby expanding the applicability of the finished product (landfill vs. land application) (Flores-Alsina et al., 2021).…”

Section: Compostingmentioning

confidence: 99%

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Pathways to Water Sector Decarbonization, Carbon Capture and Utilization

2022

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The water sector is in the middle of a paradigm shift from focusing on treatment and meeting discharge permit limits to integrated operation that also enables a circular water economy via water reuse, resource recovery, and system level planning and operation. While the sector has gone through different stages of such revolution, from improving energy efficiency to recovering renewable energy and resources, when it comes to the next step of achieving carbon neutrality or negative emission, it falls behind other infrastructure sectors such as energy and transportation. The water sector carries tremendous potential to decarbonize, from technological advancements, to operational optimization, to policy and behavioural changes. This book aims to fill an important gap for different stakeholders to gain knowledge and skills in this area and equip the water community to further decarbonize the industry and build a carbon-free society and economy. The book goes beyond technology overviews, rather it aims to provide a system level blueprint for decarbonization. It can be a reference book and textbook for graduate students, researchers, practitioners, consultants and policy makers, and it will provide practical guidance for stakeholders to analyse and implement decarbonization measures in their professions. ISBN: 9781789061789 (Paperback) ISBN: 9781789061796 (eBook) ISBN: 9781789061802 (ePUB)

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Section: Compostingmentioning

confidence: 99%

Section: Compostingmentioning

confidence: 99%

Pathways to Water Sector Decarbonization, Carbon Capture and Utilization

2022

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“…It should be noted that there are many techniques for assessing the viability of AS [11,[15][16][17][18]. They are based on studying the qualitative and quantitative composition of its biocenosis.…”

Section: Formalization Of Mathematical Modelsmentioning

confidence: 99%

“…Thus, in [16][17][18], approaches to the systematization of filamentous microorganisms are outlined. These techniques for assessing the AS biocenosis are rather labor-intensive.…”

Section: Formalization Of Mathematical Modelsmentioning

confidence: 99%

Formalization of the Task of Creating a Mathematical Model of Combined Wastewater Treatment Processes

Alekseevsky¹,

Chernysh²,

Shtepa³

2021

JES

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This paper focuses on the formation approach to formalize the mathematical modeling of wastewater treatment processes for further forming decision support systems for wastewater treatment facilities management on such a theoretical basis. To create an experimental model of formalization of modeling problems, research was conducted on activated sludge from municipal sewage treatment facilities by introducing an oxidant (H2O2) during standard operation of wastewater treatment facilities and introducing a toxicant (sulfur compounds). It was determined that under conditionally standard conditions, the influence of the oxidant is negative: exceeding technological standards of the concentration of dissolved oxygen in water solutions (3.0–13,7 mg/l), low water column transparency (1.4–1.6 cm), higher concentrations of ammonia nitrogen and phosphorus. With the appearance of a toxicant in the form of reduced sulfur compounds (sulfide ions and hydrogen sulfide 1.4–2.8 mg/l), on the contrary, the positive effect of H2O2 on biological water treatment processes was determined: the concentration of dissolved oxygen increases to 3.4 mg/l and the swelling of activated sludge stops. In this case, using a simplified scheme of expert evaluation as a global quality criterion of the biological stage management process of water treatment for rapid assessment of the vitality of activated sludge is justified. As parameters available for direct automatic measurement, it was proposed to use ORP and pH approximated by the regression equation. Also, a conditional scheme of the decision support system for water treatment management was proposed, which will provide two-level hierarchical control: situational and operational in real-time with a preventive response to emergencies; tactical with daily, at least daily, forecasting of the treatment plants.

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“…Closed-loop control showed an improved result when compared with open-loop operation [30]. Sludge management strategies like bio-solids beneficiation facility (BBF) are studied to improve solubility, sludge dewaterability, and handle high sludge loads with change in the microbial population [31].…”

Section: Introductionmentioning

confidence: 99%

Design of Feedback Control Strategies in a Plant-Wide Wastewater Treatment Plant for Simultaneous Evaluation of Economics, Energy Usage, and Removal of Nutrients

et al. 2021

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Simultaneous removal of nitrogen and phosphorous is a recommended practice while treating wastewater. In the present study, control strategies based on proportional-integral (PI), model predictive control (MPC), and fuzzy logic are developed and implemented on a plant-wide wastewater treatment plant. Four combinations of control frameworks are developed in order to reduce the operational cost and improve the effluent quality. As a working platform, a Benchmark simulation model (BSM2-P) is used. A default control framework with PI controllers is used to control nitrate and dissolved oxygen (DO) by manipulating the internal recycle and oxygen mass transfer coefficient (KLa). Hierarchical control topology is proposed in which a lower-level control framework with PI controllers is implemented to DO in the sixth reactor by regulating the KLa of the fifth, sixth, and seventh reactors, and fuzzy and MPC are used at the supervisory level. This supervisory level considers the ammonia in the last aerobic reactor as a feedback signal to alter the DO set-points. PI-fuzzy showed improved effluent quality by 21.1%, total phosphorus removal rate by 33.3% with an increase of operational cost, and a slight increase in the production rates of greenhouse gases. In all the control design frameworks, a trade-off is observed between operational cost and effluent quality.

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Assessment of sludge management strategies in wastewater treatment systems using a plant-wide approach

Cited by 33 publications

References 67 publications

Pathways to Water Sector Decarbonization, Carbon Capture and Utilization

Pathways to Water Sector Decarbonization, Carbon Capture and Utilization

Formalization of the Task of Creating a Mathematical Model of Combined Wastewater Treatment Processes

Design of Feedback Control Strategies in a Plant-Wide Wastewater Treatment Plant for Simultaneous Evaluation of Economics, Energy Usage, and Removal of Nutrients

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