Impact of the substrate composition on enhanced biological phosphorus removal during formation of aerobic granular sludge

Dockx, Lennert; Caluwé, Michel; Vleeschauwer, Flinn De; Dobbeleers, Thomas; Dries, Jan

doi:10.1016/j.biortech.2021.125482

Cited by 23 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The biological method for capturing phosphate utilizes specialized bacteria under alternating anaerobic and aerobic conditions leading to lower energy consumption and efficient phosphorus removal through the formation of polyphosphate sludge. [12][13][14] However, environmental factors like temperature and pH can significantly impact its effectiveness, and it is difficult to scale up the biological method. The adsorption method leverages a particle's affinity towards phosphate ions for selective removal from water.…”

Section: Introductionmentioning

confidence: 99%

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Yang,

Zhang,

Shrimant

et al. 2024

Preprint

View full text Add to dashboard Cite

The discharge of excessive phosphorous into water bodies can lead to serious eutrophication threatening aquatic ecosystem. Membrane capacitive deionization (MCDI) is an effective platform for deionizing aqueous streams; however, conventional MCDI is unable to selectively remove targeted ions from a liquid mixture. In this work, we fabricated manganese oxide composite anion exchange membranes (AEMs) for MCDI to enhance phosphate removal selectivity from sodium chloride-sodium dihydrogen phosphate (10:1 molar ratio) aqueous mixtures. We systematically investigated several critical factors, such as constant current or voltage operation, applied voltage amount, process stream pH, and manganese oxide content in the AEM, on phosphate removal efficiency and phosphate selectivity. A trade-off was observed between phosphate removal and selectivity when increasing the cell voltage. Under the best conditions, an MCDI unit with a 20 wt% Mn2O3 composite AEM and a bipolar membrane facilitated high phosphate removal efficiency of ≥ 31.8 % and a phosphate over chloride selectivity of 1.1 while showing stability for at least 30 cycles. To help understand how manganese oxide particles boost AEM selectivity, static electronic structure calculations were performed, and they revelated that hydrogen phosphate absorption on Mn2O3 composite AEM was 314 kcal/mol more exothermic than that on pristine AEM while chloride adsorption on Mn2O3 composite AEM was 2.2 kcal/mol less exothermic than that on a pristine AEM. Overall, this work presents an effective strategy for selectively removing phosphate from model wastewater solutions and the mechanistic understanding that governs ion selectivity in composite ion-exchange membranes used in MCDI.

show abstract

Section: Introductionmentioning

confidence: 99%

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Yang,

Zhang,

Shrimant

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…To obtain stable aerobic granules, several operational strategies as described below are followed: (i) settling time (low settling time is a main selection pressure on the biomass and helps in washing out of flocculent biomass from the reactor) [13], (ii) type of inoculum (hydrophobic bacterial cells as inoculum helps in rapid formation of granules) [14], (iii) substrates composition and concentration (low substrate and high microbial concentration lead to excess growth of filamentous bacteria) [15], (iv) feed strategies (feast famine system supports the co-habitation of microbes in accumulation of PHA and helps to select microbes with low growth rate) [16], (v) aeration and DO (aeration rate and up-flow air velocities lead to hydrodynamic shear forces which enhances the EPS generation and thus improves the structural integrity of granules) [17], (vi) pH and temperature [12].…”

Section: Introductionmentioning

confidence: 99%

Development and long-term operation of aerobic granular system for simultaneous removal of COD, nitrogen, and phosphorous in a conical SBR

Desireddy¹,

Madhavan²,

Sabumon³

2022

Environmental Engineering Research

View full text Add to dashboard Cite

This study evaluates the performance of a simple sequencing batch reactor (SBR) with conical geometric configuration in terms of aerobic granulation and simultaneous removal of COD, nitrogen, and phosphorous from synthetic wastewater. The reactor was operated for 328 days in 3 different phases. Stable granules measuring around 0.9±0.3 mm with good settling properties were formed in phase III of operation. Optimum removals of COD (90%), NH4 + -N (91%), total nitrogen (87%), and PO4 3--P (83%) were achieved in phase III, while the influent concentrations were COD (640±32 mg/L), NH4 + -N (53±2.5 mg/L), and PO4 3--P (9±0.6 mg/L). Mixed liquor suspended solids increased from 0.26 g/L to 2.3 g/L while sludge volume index (SVI30) decreased from 380 mL/g to 65 mL/g during start-up to end of the study, respectively. The conical geometry induces an effective velocity gradient along with aeration in the reactor for better flocculation of biomass which has a good impact on the formation of stable and resistant aerobic granules. This system in conical SBR is advantageous as it attains simultaneous nutrient removal (CNP) with effective biomass retention without automatic process control. This treatment system has the potential to employ in low volume wastewater treatment in many decentralized applications.

show abstract

The impact of reduced sulfur compounds on aerobic granular sludge formation and biological phosphorus removal

Seguel Suazo,

Dobbeleers,

Dries

2024

Biochemical Engineering Journal

View full text Add to dashboard Cite

Impact of the substrate composition on enhanced biological phosphorus removal during formation of aerobic granular sludge

Cited by 23 publications

References 46 publications

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Development and long-term operation of aerobic granular system for simultaneous removal of COD, nitrogen, and phosphorous in a conical SBR

The impact of reduced sulfur compounds on aerobic granular sludge formation and biological phosphorus removal

Contact Info

Product

Resources

About