Biological phosphorus removal in an extended ASM2 model: Roles of extracellular polymeric substances and kinetic modeling

Yang, Shan-Shan; Pang, Ji-Wei; Guo, Wei; Yang, Xiaowei; Wu, Zhiying; Ren, Nanqi; Zhao, Zhiqing

doi:10.1016/j.biortech.2017.01.048

Cited by 23 publications

(4 citation statements)

References 15 publications

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“…Adsorption tests were performed at various initial pH values ranging from 2 to 12 to investigate the interaction mechanisms between orthophosphates and LDHs. Depending on the value of pH solution, orthophosphates can exist in several forms H 3 PO 4 , -H PO , 2 4 -HPO , 4 2 and -PO 4 3 [29]. Results of figure 7 show that the affinity of adsorbent to remove orthophosphates is low at pH3, this can be explained by the instability of LDHs structure [30].…”

Section: Adsorption Mechanismsmentioning

confidence: 97%

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Zn-Al layered double hydroxide: synthesis, characterization and application for orthophosphates ions adsorption in aqueous medium

Rouahna

Ouakouak

Srasra

2020

Mater. Res. Express

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This paper aims at studying the preparation of Zn-Al-LDH anionic clay and its adsorption proprieties in removing orthophosphate ions from aqueous medium. The LDH phase was synthesized by coprecipitation method and then calcined at 500°C. Structural and textural properties of the prepared LDHs were determined by using x-ray diffraction, FTIR, BET, SEM and pH PZC analysis. Batch adsorption experiments were carried out under different parameters such as stirring time, pH and initial orthophosphate concentration. Results show that the prepared LDHs are efficient in removing orthophosphate and the maximum uptake was observed after 2 h. Experimental kinetic data are well described by the pseudo-second order model. It was also found that the adsorption process is significantly affected by the pH value. The sorption mechanisms include ion exchange, reconstitution of LDH phase and/or electrostatic attraction. Also, the isotherm study reveals that the Freundlich equation best fit the equilibrium data.

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Section: Adsorption Mechanismsmentioning

confidence: 97%

“…However, the anthropogenic source of P is related to agricultural activities, industrial effluents, detergents, animal excrement and fertilizers [3]. Discharging of elevated amounts of P into aquatic environment generates eutrophication phenomenon and leads to the degradation of aquatic ecosystems [4].…”

Section: Introductionmentioning

confidence: 99%

Zn-Al layered double hydroxide: synthesis, characterization and application for orthophosphates ions adsorption in aqueous medium

Rouahna

Ouakouak

Srasra

2020

Mater. Res. Express

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“…The task of optimizing wastewater treatment process is highly challenging since the optimal operating conditions of the WWTP are difficult to be controlled due to its biological, physical, and chemical processes are complex, interrelated, and highly nonlinear [11]. Increasing attention to modeling wastewater processes has led to the development of several mechanistic models capable of describing the complicated processes involved in WWTPs (e.g., activated sludge model (ASM) family, including ASM1, ASM2, ASM2d, and ASM3) [12][13][14][15]. However, these mechanistic models have complex structures, making them unsuitable for controlling purposes [16].…”

Section: Introductionmentioning

confidence: 99%

Intelligent Control/Operational Strategies in WWTPs through an Integrated Q-Learning Algorithm with ASM2d-Guided Reward

Pang

Yang

et al. 2019

Water

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The operation of a wastewater treatment plant (WWTP) is a typical complex control problem, with nonlinear dynamics and coupling effects among the variables, which renders the implementation of real-time optimal control an enormous challenge. In this study, a Q-learning algorithm with activated sludge model No. 2d-guided (ASM2d-guided) reward setting (an integrated ASM2d-QL algorithm) is proposed, and the widely applied anaerobic-anoxic-oxic (AAO) system is chosen as the research paradigm. The integrated ASM2d-QL algorithms equipped with a self-learning mechanism are derived for optimizing the control strategies (hydraulic retention time (HRT) and internal recycling ratio (IRR)) of the AAO system. To optimize the control strategies of the AAO system under varying influent loads, Q matrixes were built for both HRTs and IRR optimization through the pair of <max reward-action> based on the integrated ASM2d-QL algorithm. 8 days of actual influent qualities of a certain municipal AAO wastewater treatment plant in June were arbitrarily chosen as the influent concentrations for model verification. Good agreement between the values of the model simulations and experimental results indicated that this proposed integrated ASM2d-QL algorithm performed properly and successfully realized intelligent modeling and stable optimal control strategies under fluctuating influent loads during wastewater treatment.

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“…EBPR in full-scale wastewater treatment plants is usually operated at high SRTs (around 10 days) which is adequate to promote PAO growth [ 5 ]. Noted, the extracellular polymeric substances (EPS) variations under the anaerobic-aerobic process are closely related to the uptake and release of P in the biological phosphorus removal process [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Phosphogypsum Addition on Phosphorus Release in Biochemical Treatment of Sewage Sludge

Chernysh

Bálintová

Plyatsuk

et al. 2018

IJERPH

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The paper is focused on the research of biochemical treatment of sewage sludge and phosphogypsum under sulphate-reducing conditions with a phosphorus release process. The theoretical foundations of the work were based on the biochemical formalization using the principles of autocatalysis of natural systems. During the experimental research for the control of physicochemical parameters of the process spectroquantic, X-ray fluorescence analysis and other techniques were used. A schematic model of the dephosphatation process under anaerobic stabilization of sewage sludge and phosphogypsum was developed. The increase of phosphogypsum dosage had a close correlation with the release of phosphate ions. At the stimulating action of the phosphogypsum additive, a 2.5–5.0-fold increase in soluble phosphate concentration was observed. The rational dose of phosphogypsum was determined. Along with an increase the ratio of COD (Chemical Oxygen Demand)/phosphogypsum to 0.1, an increase in the phosphate ions in solution was observed. A further increase in the ratio of COD/phosphogypsum did not affect the concentration of phosphate ions in solution.

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Biological phosphorus removal in an extended ASM2 model: Roles of extracellular polymeric substances and kinetic modeling

Cited by 23 publications

References 15 publications

Zn-Al layered double hydroxide: synthesis, characterization and application for orthophosphates ions adsorption in aqueous medium

Zn-Al layered double hydroxide: synthesis, characterization and application for orthophosphates ions adsorption in aqueous medium

Intelligent Control/Operational Strategies in WWTPs through an Integrated Q-Learning Algorithm with ASM2d-Guided Reward

The Influence of Phosphogypsum Addition on Phosphorus Release in Biochemical Treatment of Sewage Sludge

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