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Zambrano, Jesús
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Publications (10 of 18) Show all publications
Zambrano, J., Samuelsson, O. & Carlsson, B. (2019). Machine learning techniques for monitoring the sludge profile in a secondary settler tank. Applied water science, 9(6), Article ID 146.
Open this publication in new window or tab >>Machine learning techniques for monitoring the sludge profile in a secondary settler tank
2019 (English)In: Applied water science, ISSN 2190-5487, E-ISSN 2190-5495, Vol. 9, no 6, article id 146Article in journal (Refereed) Published
National Category
Water Treatment Control Engineering
Identifiers
urn:nbn:se:uu:diva-391296 (URN)10.1007/s13201-019-1018-5 (DOI)000476592500001 ()
Available from: 2019-07-20 Created: 2019-08-22 Last updated: 2019-08-30Bibliographically approved
Carlsson, B. & Zambrano, J. (2016). Fault detection and isolation of sensors in aeration control systems. Water Science and Technology, 73(3), 648-653
Open this publication in new window or tab >>Fault detection and isolation of sensors in aeration control systems
2016 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 73, no 3, p. 648-653Article in journal (Refereed) Published
Abstract [en]

In this paper, we consider the problem of fault detection (FD) and isolation in the aeration system of an activated sludge process. For this study, the dissolved oxygen in each aerated zone is assumed to be controlled automatically. As the basis for an FD method we use the ratio of air flow rates into different zones. The method is evaluated in two scenarios: using the Benchmark Simulation Model no. 1 (BSM1) by Monte Carlo simulations and using data from a wastewater treatment plant. The FD method shows good results for a correct and early FD and isolation.

Keywords
activated sludge; aeration control; fault detection; incidence matrix; monitoring
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-277301 (URN)10.2166/wst.2015.529 (DOI)000374396300024 ()26877049 (PubMedID)
Funder
EU, FP7, Seventh Framework Programme, 315145
Available from: 2016-02-19 Created: 2016-02-19 Last updated: 2017-11-30Bibliographically approved
Diehl, S., Zambrano, J. & Carlsson, B. (2016). Steady-state analysis of activated sludge processes with a settler model including sludge compression. Water Research, 88, 104-116
Open this publication in new window or tab >>Steady-state analysis of activated sludge processes with a settler model including sludge compression
2016 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 88, p. 104-116Article in journal (Refereed) Published
Abstract [en]

A reduced model of a completely stirred-tank bioreactor coupled to a settling tank with recycle is analyzed in its steady states. In the reactor, the concentrations of one dominant particulate biomass and one soluble substrate component are modelled. While the biomass decay rate is assumed to be constant, growth kinetics can depend on both substrate and biomass concentrations, and optionally model substrate inhibition. Compressive and hindered settling phenomena are included using the Bürger-Diehl settler model, which consists of a partial differential equation. Steady-state solutions of this partial differential equation are obtained from an ordinary differential equation, making steady-state analysis of the entire plant difficult. A key result showing that the ordinary differential equation can be replaced with an approximate algebraic equation simplifies model analysis. This algebraic equation takes the location of the sludge-blanket during normal operation into account, allowing for the limiting flux capacity caused by compressive settling to easily be included in the steady-state mass balance equations for the entire plant system. This novel approach grants the possibility of more realistic solutions than other previously published reduced models, comprised of yet simpler settler assumptions. The steady-state concentrations, solids residence time, and the wastage flow ratio are functions of the recycle ratio. Solutions are shown for various growth kinetics; with different values of biomass decay rate, influent volumetric flow, and substrate concentration.

Keywords
Bioreactor; Burger-Diehl settler model; Growth kinetics; Limiting flux; Secondary settling tank; Solids residence time (SAT)
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-266264 (URN)10.1016/j.watres.2015.09.052 (DOI)000367276500010 ()
Funder
ÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Available from: 2015-10-09 Created: 2015-11-05 Last updated: 2017-12-01Bibliographically approved
Carlsson, B., Diehl, S. & Zambrano, J. (2015). Analyses of Activated Sludge Processes Consisting of a Plug-Flow Reactor and a Non-ideal Settler. In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment: . Paper presented at WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia.
Open this publication in new window or tab >>Analyses of Activated Sludge Processes Consisting of a Plug-Flow Reactor and a Non-ideal Settler
2015 (English)In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment, 2015Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

An activated sludge process (ASP) consisting of a plug-flow reactor (PFR) and a non-ideal settler is modelled and analysed. One soluble substrate component and one particulate biomass are assumed. The biomass growth rate is described by a Monod function. The settler model includes hindered settling and compression. A model describing the steady-state behaviour of the ASP is derived which constrains the settler to work with a fixed sludge blanket height in the thickening zone. The model provides new understanding for these types of ASPs and may be used for novel design schemes. The numerical example suggests that the steady-state solutions of the ASP give a one-parameter family of solutions, where the parameter is the recycle ratio r.

National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-257699 (URN)
Conference
WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia
Available from: 2015-07-07 Created: 2015-07-07 Last updated: 2015-07-09
Nájera, S., Gil-Martínez, M. & Zambrano, J. A. (2015). ATAD control goals through the analysis of process variables and evaluation of quality, production and cost. Water Science and Technology, 71(5), 717-724
Open this publication in new window or tab >>ATAD control goals through the analysis of process variables and evaluation of quality, production and cost
2015 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 71, no 5, p. 717-724Article in journal (Refereed) Published
Abstract [en]

The aim of this paper is to establish and quantify different operational goals and control strategies in autothermal thermophilic aerobic digestion (ATAD). This technology appears as an alternative to conventional sludge digestion systems. During the batch-mode reaction, high temperatures promote sludge stabilization and pasteurization. The digester temperature is usually the only online, robust, measurable variable. The average temperature can be regulated by manipulating both the air injection and the sludge retention time. An improved performance of diverse biochemical variables can be achieved through proper manipulation of these inputs. However, a better quality of treated sludge usually implies major operating costs or a lower production rate. Thus, quality, production and cost indices are defined to quantify the outcomes of the treatment. Based on these, tradeoff control strategies are proposed and illustrated through some examples. This paper's results are relevant to guide plant operators, to design automatic control systems and to compare or evaluate the control performance on ATAD systems.

National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-251664 (URN)10.2166/wst.2015.006 (DOI)000351218900009 ()25768218 (PubMedID)
Available from: 2015-04-23 Created: 2015-04-23 Last updated: 2017-12-04Bibliographically approved
Chistiakova, T., Carlsson, B., Zambrano, J. & Samuelsson, O. (2015). Binary classifiers applied to detect DO sensor faults during washing events. In: Proc. 2nd IWA Conference on New Developments in IT & Water: . Paper presented at 2nd IWA Conference on New Developments in IT & Water, February 8–10, 2015, Rotterdam, The Netherlands. IWA Publishing
Open this publication in new window or tab >>Binary classifiers applied to detect DO sensor faults during washing events
2015 (English)In: Proc. 2nd IWA Conference on New Developments in IT & Water, IWA Publishing, 2015Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

In this paper, several classication techniques are applied for monitoring the status of DO sensors in wastewater treatment plants. In particular, DO sensors during washing events are studied and indication parameters from these events are used. The methods considered are the following: k-Nearest Neighbours, Radial Basis Function and Random Forest classiers. The result shows the comparison and the eligibility of the methods to detect a clogged DO-sensor.

Place, publisher, year, edition, pages
IWA Publishing, 2015
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-236309 (URN)
Conference
2nd IWA Conference on New Developments in IT & Water, February 8–10, 2015, Rotterdam, The Netherlands
Available from: 2014-11-17 Created: 2014-11-17 Last updated: 2014-11-19Bibliographically approved
Samuelsson, O., Zambrano, J., Björk, A., Chistiakova, T. & Carlsson, B. (2015). Detecting anomalous air flow-ammonia load ratios, using Gaussian process regression. In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment: . Paper presented at WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia.
Open this publication in new window or tab >>Detecting anomalous air flow-ammonia load ratios, using Gaussian process regression
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2015 (English)In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment, 2015Conference paper, Oral presentation with published abstract (Refereed)
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-270518 (URN)
Conference
WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia
Available from: 2015-12-29 Created: 2015-12-29 Last updated: 2017-10-11Bibliographically approved
Zambrano, J. & Carlsson, B. (2015). Fault detection of DO sensors subject to possible clogging. In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment: . Paper presented at WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia.
Open this publication in new window or tab >>Fault detection of DO sensors subject to possible clogging
2015 (English)In: Proc. 9th IWA Symposium on Systems Analysis and Integrated Assessment, 2015Conference paper, Oral presentation only (Other academic)
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-257698 (URN)
Conference
WATERMATEX 2015, June 14–17, Gold Coast, Queensland, Australia
Available from: 2015-07-07 Created: 2015-07-07 Last updated: 2015-07-09
Zambrano, J., Samuelsson, O., Chistiakova, T., Liu, H. & Carlsson, B. (2015). Gaussian process regression for monitoring a secondary settler. In: Proc. 2nd IWA Conference on New Developments in IT & Water: . Paper presented at 2nd IWA Conference on New Developments in IT & Water, February 8–10, 2015, Rotterdam, The Netherlands. IWA Publishing
Open this publication in new window or tab >>Gaussian process regression for monitoring a secondary settler
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2015 (English)In: Proc. 2nd IWA Conference on New Developments in IT & Water, IWA Publishing, 2015Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

An approach based on Gaussian Process Regression for monitoring the sludge profile of a secondary settler is proposed. Gaussian Process is a probabilistic, nonparametric model with an uncertainty prediction. The approach is illustrated using data from a sensor measuring the sludge concentration in a settler as a function of the settler depth at Bromma wastewater treatment plant (WWTP). Results suggest that the approach is feasible for monitoring and fault detection of the sludge settling process.

Place, publisher, year, edition, pages
IWA Publishing, 2015
National Category
Control Engineering Water Treatment
Identifiers
urn:nbn:se:uu:diva-235554 (URN)
Conference
2nd IWA Conference on New Developments in IT & Water, February 8–10, 2015, Rotterdam, The Netherlands
Available from: 2014-11-05 Created: 2014-11-05 Last updated: 2017-01-25Bibliographically approved
Zambrano, J., Carlsson, B. & Diehl, S. (2015). Optimal steady-state design of zone volumes of bioreactors with Monod growth kinetics. Biochemical engineering journal, 100, 59-66
Open this publication in new window or tab >>Optimal steady-state design of zone volumes of bioreactors with Monod growth kinetics
2015 (English)In: Biochemical engineering journal, ISSN 1369-703X, E-ISSN 1873-295X, Vol. 100, p. 59-66Article in journal (Refereed) Published
National Category
Control Engineering Environmental Biotechnology
Identifiers
urn:nbn:se:uu:diva-252429 (URN)10.1016/j.bej.2015.04.002 (DOI)000357904400008 ()
Available from: 2015-04-11 Created: 2015-05-07 Last updated: 2017-12-04Bibliographically approved
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