Effects of P/C ratios on the growth, phosphorus removal and phosphorus recovery of a novel strain of highly efficient PAO

Expected requirements of phosphorus recovery, restrictions on sludge disposal on landfill, and difficulties in obtaining consensus on sludge use on agricultural land has led to several development works in Sweden to change sludge management methods. Especially sludge fractionation has gained interest including following steps to recover products and separate transfer of toxic substances into a small stream. Commercial systems are offered based on technology by Cambi/KREPRO and BioCon and other companies and many other methods are under development. Iron salts are widely used in Sweden as precipitation agents for phosphorus removal and this technology has some disadvantages for phosphorus recovery compared with the use of biological phosphorus removal. The amount of chemicals needed for a KREPRO or a BioCon system was calculated for a treatment plant which has an addition of iron salt resulting in 1,900 mole Fe per tonne DS. The result was compared with the chemical consumption of recovery systems installed at plants with lower use of iron for precipitation. The chemical consumption in equivalents per tonne DS was found to be 5,000 + 6,000 * (molar ratio iron to phosphorus).

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The PHO pathway involved in phosphate metabolism in Yeast for efficient phosphorus removal

E3S Web of Conferences ◽

10.1051/e3sconf/20185304023 ◽

2018 ◽

Vol 53 ◽

pp. 04023

Author(s):

Mengfei Hu ◽

Liping Qiu ◽

Yan Wang

Keyword(s):

Protein Interactions ◽

Phosphorus Removal ◽

High Efficiency ◽

Sewage Treatment ◽

Essential Elements ◽

Phosphorus Recovery ◽

Biological Phosphorus Removal ◽

Protein Protein Interactions ◽

Pho Pathway ◽

Biological Phosphorus

Phosphorus is one of the essential elements needed for the growth and reproduction of any organism. To improve the efficiency of biological phosphorus removal in sewage, it is very important to grasp the precise mechanism of biological phosphorus removal. Yeast is a single cell fungus and has a unique advantage in sewage treatment. Recent studies in the different types of yeast have revealed that there is a phosphate-responsive signal transduction (PHO) pathway to regulate phosphate-responsive genes for controlling phosphate absorption. In this review, the metabolic mechanisms and protein-protein interactions associated with the PHO pathway are highlighted firstly, and then several examples about improving the phosphorus removal efficiency of sewage by inducing gene mutation in yeast phosphorus metabolism was introduced. The aim is to provide new ideas for the realization of high-efficiency phosphorus recovery in nature.

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Perspectives on Microalgal Biofilm Systems with Respect to Integration into Wastewater Treatment Technologies and Phosphorus Scarcity

Water ◽

10.3390/w12082245 ◽

2020 ◽

Vol 12 (8) ◽

pp. 2245

Author(s):

Kateřina Sukačová ◽

Daniel Vícha ◽

Jiří Dušek

Keyword(s):

Wastewater Treatment ◽

Phosphorus Removal ◽

New Technologies ◽

Wastewater Treatment Plants ◽

Phosphorus Uptake ◽

Phosphorus Recovery ◽

Practical Application ◽

High Concentration ◽

Water Ecosystem ◽

Treatment Technologies

Phosphorus is one of the non-renewable natural resources. High concentration of phosphorus in surface water leads to undesirable eutrophication of the water ecosystem. It is therefore necessary to develop new technologies not only for capturing phosphorus from wastewater but also for phosphorus recovery. The aim of the study was to propose three different integration scenarios for a microalgal biofilm system for phosphorus removal in medium and small wastewater treatment plants, including a comparison of area requirements, a crucial factor in practical application of microalgal biofilm systems. The area requirements of a microalgal biofilm system range from 2.3 to 3.2 m2 per person equivalent. The total phosphorus uptake seems to be feasible for construction and integration of microalgal biofilm systems into small wastewater treatment plants. Application of a microalgal biofilm for phosphorus recovery can be considered one of the more promising technologies related to capturing CO2 and releasing of O2 into the atmosphere.

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Development of a high-efficiency phosphorus recovery method using a fluidized-bed crystallized phosphorus removal system

Water Science & Technology ◽

10.2166/wst.2003.0043 ◽

2003 ◽

Vol 48 (1) ◽

pp. 163-170 ◽

Cited By ~ 23

Author(s):

K. Shimamura ◽

T. Tanaka ◽

Y. Miura ◽

H. Ishikawa

Keyword(s):

Particle Size ◽

Fluidized Bed ◽

Phosphorus Removal ◽

Seed Crystal ◽

Phosphorus Recovery ◽

Main Reaction ◽

Recovery Ratio ◽

Recovery Method ◽

Type Reactor ◽

Removal System

The authors have been engaged in the research and development concerning the recovery of MAP (Magnesium Ammonium Phosphate) using a fluidized-bed crystallized phosphorus removal system. In the reactor of the fluidized-bed crystallized phosphorus removal system, seed crystals (of MAP) are fluidized previously and new MAP crystals are produced on the seed crystal surfaces. Conventionally, the reactor consisted of one reaction tank only, but this practice had the problem that as the crystallization progresses, the seed crystal is grown excessively and as a result, the effective reaction surface areas are decreased and the fluidization effect is degraded, causing the recovery ratio to be decreased. Recently, the authors have devised a two-tank type reactor by adding a sub reaction tank to the reactor (now the main reaction tank) so that the MAP particle size in the main reaction tank may be kept constant making the recovery ratio stable. They conducted a demonstration test with a pilot experimental system of the 2-tank type reactor. For raw water T-P 111 to 507 mg/L, the main reaction tank treated water T-P 14.0 to 79.5 mg/L and phosphorus recovery ratios 84 to 92% were obtained. Because the mean MAP particle size in the main reaction tank could be kept constant, the phosphorus recovery ratio could always be above 80%, realizing stable treatment.

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Phosphorus recovery from sewage with a sustainable and low-cost treatment system

Water Science & Technology ◽

10.2166/wst.2019.332 ◽

2019 ◽

Vol 80 (5) ◽

pp. 846-854

Author(s):

Vitor Tonzar Chaves ◽

Dione Mari Morita ◽

Iara Regina Soares Chao ◽

Ronan Cleber Contrera

Keyword(s):

Constructed Wetland ◽

Phosphorus Removal ◽

Phosphorus Recovery ◽

Maximum Efficiency ◽

Integrative Approach ◽

Isotherm Models ◽

Phosphorus Concentration ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Initial Ph

Abstract This study proposes a technology conceived based on an integrative approach that aims to promote phosphorus recovery and to recycle ferric water treatment sludge (FWTS), using it as a phosphorus adsorbent which may be applied as a soil ameliorant after reaching saturation. The assessed pilot plant operated with a daily influent flow of 360 litres and presented a removal efficiency of 94.4% ± 3.2% for chemical oxygen demand (COD) and of 91.2% ± 7.8% for suspended solids. It also presented promising results for phosphorus removal. The maximum efficiency of dissolved reactive phosphorus removal was 95% on the first day and it decreased until reaching adsorbent saturation. The estimated breakthrough time was one year in the condition in which the filling medium of a second constructed wetland was only FWTS. In this situation, the effluent phosphorus concentration was 0.2 mg·L−1. The authors concluded that the application of FWTS in a constructed wetland bed is an interesting alternative. Batch adsorption experiments were run using phosphorus stock solution. Langmuir and Freundlich adsorption isotherm models were obtained for different initial pH values. The maximum adsorption capacity decreased as the initial pH was increased; values ranged from 4.76 mg P·g−1 (pH = 3.9) to 1.44 mg P·g−1 (pH = 9.0).

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Advanced phosphorus recovery using a novel SBR system with granular sludge in simultaneous nitrification, denitrification and phosphorus removal process

Applied Microbiology and Biotechnology ◽

10.1007/s00253-015-7249-y ◽

2016 ◽

Vol 100 (10) ◽

pp. 4367-4374 ◽

Cited By ~ 15

Author(s):

Yong-Ze Lu ◽

Hou-Feng Wang ◽

Thomas A. Kotsopoulos ◽

Raymond J. Zeng

Keyword(s):

Phosphorus Removal ◽

Granular Sludge ◽

Phosphorus Recovery ◽

Removal Process

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Closing the cycle: phosphorus removal and recovery from diluted e?uents using acid resistive membranes

10.31224/osf.io/6n53p ◽

2019 ◽

Author(s):

Matthias Wessling

Keyword(s):

Calcium Phosphate ◽

Phosphorus Removal ◽

Acid Resistance ◽

Phosphorus Recovery ◽

Treated Wastewater ◽

Phosphorus Concentration ◽

Phosphorus Cycle ◽

Permeate Flux ◽

New Approach ◽

Removal And Recovery

New regulations in many developed countries call for significant reduction in phosphorus concentration for effluents released to the environment. At the same time, recovery of phosphorus – a non-renewable resource used mainly as fertilizer – from anthropogenic waste is extensively studied and bolstered as a crucial component in maintaining future food security. Thus far, studies on phosphorus recovery mainly focused on concentrated streams; although diluted effluents such as treated wastewater often contain a significant portion of the phosphorus mass. Here we propose a new approach for the simultaneous removal and recovery of phosphorus from diluted effluents using a membrane characterized by high phosphate rejection and acid resistance. High P rejection allows for the concentration of phosphorus in the retentate until recoverable calcium-phosphate precipitants are formed, while acid resistance enables a simple and effective chemical cleaning of the membrane. Factors affecting the removal and recovery of phosphorus during filtration are studied here experimentally and through thermochemical modeling. CaCO3 precipitation in the retentate resulted in severe scaling, whereas calcium-phosphate precipitated mostly in the bulk, resulting in colloidal fouling which was manageable by maintaining sub-critical permeate flux. Selective Ca-P precipitation is feasible via pH adjustments, requiring very little acid addition as shown through thermochemical modeling. Calcium-phosphate deposits were easily removed from the feed channel using acid-cleaning, and the permeate flux was completely restored. Furthermore, phosphorus removal and recovery by nanofiltration was shown to require less operating expenses compared to a more conventional approach comprising P removal by ferric chloride addition and its subsequent recovery from incinerated sludge. Our results therefore demonstrate the potential of this new approach as a step forward towards closing the anthropogenic phosphorus cycle.

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Analysis of the Status and Improvement of Microalgal Phosphorus Removal from Municipal Wastewater

Processes ◽

10.3390/pr9091486 ◽

2021 ◽

Vol 9 (9) ◽

pp. 1486

Author(s):

Yilin Mao ◽

Rongwei Xiong ◽

Xiufang Gao ◽

Li Jiang ◽

Yancong Peng ◽

...

Keyword(s):

Phosphorus Removal ◽

Municipal Wastewater ◽

Phosphorus Recovery ◽

Municipal Sewage ◽

Municipal Wastewater Treatment ◽

Internal Factors ◽

Algae Biomass ◽

The Sustainable Development ◽

Phosphorous Removal ◽

The Status

Phosphorus, as one of the main pollutants in municipal sewage, has received increasing attention recently. Phosphorus recovery also increases the sustainable development of municipal wastewater. Since algae have the ability to effectively redirect nutrients, including phosphorus, from municipal sewage to algae biomass, municipal sewage treatments involving microalgae have piqued the interest of many researchers. The phosphorus removal depends on the potential of the microalgae to absorb, preserve, or degrade phosphorus in municipal wastewater. It is, therefore, of great interest to study the mechanisms underlying the absorption, storage, and degradation of phosphorus by microalgae to ensure the viability of this phosphorus removal process in wastewater. The objectives of this review were to summarize phosphorus metabolism in microalgae, examine key external and internal factors impacting phosphorous removal by microalgae from wastewater, and examine the status of phosphorous-metabolism-related research to improve our understanding of microalgae-based municipal wastewater treatments. In addition, the methods of recovery of microalgae after phosphorous removal were summarized to ensure the sustainability of municipal wastewater treatment. Finally, a potential approach using nanomaterials was proposed to enhance the overall phosphorous removal performance in municipal wastewater through the addition of nanoparticles such as magnesium and iron.

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