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Design of a modern automatic control system for the activated sludge process in wastewater treatment

Chinese Journal of Chemical Engineering 2015年第8期23卷 1340-1349页

作者： Alexandros D.Kotzapetros Panayotis A.Paraskevas athanasios s.stasinakis Water and Air Quality Laboratory Department of EnvironmentUniversity of the AegeanUniversity Hill

The Activated sludge Process(AsP) exhibits highly nonlinear properties. The design of an automatic control system that is robust against disturbance of inlet wastewater flow rate and has short process settling times is a challenging matter. The proposed control method is an I-P modi fied controller automatic control system with state variable feedback and control canonical form simulation diagram for the process. A more stable response is achieved with this type of modern control. settling times of 0.48 days are achieved for the concentration of microorganisms,(reference value step increase of 50 mg·L-1) and 0.01 days for the concentration of oxygen(reference value step increase of 0.1 mg·L-1). Fluctuations of concentrations of oxygen and microorganisms after an inlet disturbance of5 × 103m3·d-1are small. Changes in the reference values of oxygen and microorganisms(increases by 10%, 20% and 30%) show satisfactory response of the system in all cases. Changes in the value of inlet wastewater flow rate disturbance(increases by 10%, 25%, 50% and 100%) are stabilized by the control system in short time. Maximum percent overshoot is also taken in consideration in all cases and the largest value is 25% which is acceptable. The proposed method with I-P controller is better for disturbance rejection and process settling times compared to the same method using PI controller. This method can substitute optimal control systems in AsP.

关键词： Activated sludge Modern automatic control PID controllers Root locus Waste treatment

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Effectiveness of tertiary treatment processes in removing different classes of emerging contaminants from domestic wastewater

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Frontiers of Environmental science & Engineering 2022年第11期16卷 261-272页

作者： Olga s.Arvaniti Marilena E.Dasenaki Alexandros G.Asimakopoulos Niki C.Maragou Vasilios G.samaras Korina Antoniou Georgia Gatidou Daniel Mamais Constantinos Noutsopoulos Zacharias Frontistis Nikolaos s.Thomaidis athanasios s.stasinakis Department of Environment University of the AegeanMytilene 81100Greece Department of Chemical Engineering University of PatrasPatras 26504Greece Department of Agricultural Development Agrofood and Management of Natural ResourcesNational and Kapodistrian University of AthensPsachna 34400Greece Department of Chemistry National and Kapodistrian University of AthensAthens 15771Greece Department of Chemistry Norwegian University of Science and TechnologyTrondheim NO-7491Norway Core Labs King Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia sanitary Engineering Laboratory Department of Water Resources and Environmental EngineeringSchool of Civil EngineeringNational Technical University of AthensAthens 15780Greece Department of Chemical Engineering University of Western MacedoniaKozani 50132Greece

In this work,38 different organic emerging contaminants(ECs),belonging to various chemical classes such as pharmaceuticals(PhCs),endocrine-disrupting chemicals(EDCs),benzotriazoles(BTRs),benzothiazoles(BTHs),and perfluorinated compounds(PFCs),were initially identified and quantified in the biologically treated wastewater collected from Athens’(Greece)sewage Treatment Plant(sTP).Processes already used in existing sTPs such as microfiltration(MF),nanofiltration(NF),ultrafiltration(UF),UV radiation,and powdered activated carbon(PAC)were assessed for ECs’removal,under the conditions that represent their actual application for disinfection or advanced wastewater *** results indicated that MF removed only one out of the 38 ECs and hence it was selected as pretreatment step for the other *** radiation in the studied conditions showed low to moderate removal for 5 out of the 38 *** showed better results than UF due to the smaller pore sizes of the filtration ***,this enhancement was observed mainly for 8 compounds originating from the classes of PhCs and PFCs,while the removal of EDCs was not statistically *** the various studied technologies,PAC stands out due to its capability to sufficiently remove most *** particular,removal rates higher than 70%were observed for 9 compounds,22 were partially removed,while 7 demonstrated low removal *** on our screening experiments,future research should focus on scaling-up PAC in actual conditions,combining PAC with other processes,and conduct a complete economic and environmental assessment of the treatment.

关键词： Micropollutants Wastewater PAC Membranes UV Tertiary treatment

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