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Zhang, L. Phosphorus in Wastewater in the Form of Polyphosphates. Encyclopedia. Available online: https://encyclopedia.pub/entry/19935 (accessed on 18 November 2024).
Zhang L. Phosphorus in Wastewater in the Form of Polyphosphates. Encyclopedia. Available at: https://encyclopedia.pub/entry/19935. Accessed November 18, 2024.
Zhang, Liang. "Phosphorus in Wastewater in the Form of Polyphosphates" Encyclopedia, https://encyclopedia.pub/entry/19935 (accessed November 18, 2024).
Zhang, L. (2022, February 26). Phosphorus in Wastewater in the Form of Polyphosphates. In Encyclopedia. https://encyclopedia.pub/entry/19935
Zhang, Liang. "Phosphorus in Wastewater in the Form of Polyphosphates." Encyclopedia. Web. 26 February, 2022.
Phosphorus in Wastewater in the Form of Polyphosphates
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This entry is adapted from the peer-reviewed paper 10.3390/pr10010144

As non-renewable resource, the recovery and utilization of phosphorus from wastewater is an enduring topic. Stimulated by the advances in research on polyphosphates (polyP) as well as the development of Enhanced Biological Phosphorus Removal (EBPR) technology to achieve the efficient accumulation of polyP via polyphosphate accumulating organisms (PAOs), a novel phosphorus removal strategy is considered with promising potential for application in real wastewater treatment processes. This entry mainly focuses on the mechanism of phosphorus aggregation in the form of polyP during the phosphate removal process. Further discussion about the reuse of polyP with different chain lengths is provided herein so as to suggest possible application pathways for this biosynthetic product.

EBPR PAOs polyP phosphorus reuse wastewater

1. Introduction

With economic and industrial development, water pollution is becoming an inevitable environmental issue and eutrophication in aqueous systems normally accompanies the excessive emission of phosphorus wastewater. To eliminate the pollution, a treatment targeting the removal of phosphate from contaminated water has been adopted since the 1950s [1][2]. In general, the technologies utilized for phosphorus removal are mainly divided into three categories, which are the chemical method [3][4], biological method [5], and chemical–biological combination method [6]. Regarding chemical phosphorus removal technology, the adsorption method is suggested as being more promising since the adsorbed phosphate could be recovered for further utilization [7]. Using ferrihydrite as the adsorbent, the maximum monolayer adsorption capacities of PO43− was verified as 66.6 mg·g−1 [8] and the adsorbed phosphorus could then be desorbed under alkaline conditions to be reused. In comparison, the biological phosphorus removal method takes advantage of the specific metabolism properties of polyphosphate accumulate organisms (PAOs) so as to excessively absorb phosphorus from wastewater and thereafter to remove P in the form of activated sludge [9]. Alternatively, chemical–biological combination methods have been developed for enhancing the efficacy of biological treatment by introducing specific chemical substances to prevent the PAOs from losing their phosphorus accumulation capabilities, particularly in environments that are not suitable for PAOs to thrive [10]. In consideration of the corresponding properties of the above phosphorus removal technologies, decisions on the actual treatment strategies are made based on the actual water quality conditions as well as economic and environmental requirements.

2. Enrichment of PolyP in PAOs during EBPR Process

EBPR is a biological phosphorus removal technology that was developed in the 1970s and is now widely used in sewage treatment plants around the world [11]. Relying on PAOs or denitrifying phosphorous accumulating bacteria (DPAOs) [12], EBPR technology can remove P by having the free P absorbed by functional microbes for the purpose of growth and accumulated within the cell in the form of polyphosphate particles [13]. The traditional EBPR process diagram is illustrated in Figure 1. Generally, by alternating anaerobic and aerobic conditions, PAOs absorb the volatile fatty acids (VFAs) in sewage during the anaerobic stage and store them as poly-β-hydroxyalkanoic acid (PHA). This stored energy substance then serves as the carbon source and provides the energy required for the phosphorus accumulation and polyphosphate synthesis in the sewage by the PAOs during the aerobic stage [14][15]. P is subsequently removed from the system when the abovementioned phosphorus-containing microorganisms are discharged as phosphorus-rich sludge from the EBPR system [16]. The content of polyphosphate can be as high as 20% of its dry weight in PAO-rich sludge [17], while it accounts for no more than 2% in normal wastewater treatment sludge. Hence, this phosphorus-rich sludge produced in the EBPR process could be considered as having the potential to be applied as the resource for phosphorus collection and further reuse. In addition, efforts could be put into introducing PAOs with enhanced capabilities for phosphate accumulation so as to have more P recycled in the form of polyP.
Figure 1. Diagram of traditional EBPR phosphorus removal method.
Although modern wastewater treatment is normally driven by biological metabolic activity, it is still an energy- and time-consuming process. As such, how to make a profit in recycling the resource from wastewater has been assessed [18][19]. Egle et al. [20] summarized the traditional EBPR system for the treatment and recovery of phosphorus in wastewater and believed that the recovery of 70% to 90% of the phosphorus in the sludge in the form of ash was the best trade-off between cost and benefit. With the limited recovery rate of the traditional phosphorus removal process, the development of strategies that recover dissolved phosphorus more efficiently in the form of polyP is considered to be beneficial with respect to the techno-economic feasibility by taking into account the application potential of this biosynthetic product.

3. PolyP Recovery from Phosphorus Removal System

Traditionally, the phosphorus-rich sludge produced from EBPR is directly used as fertilizer or dehydrated for incineration [21][22], although chemical and biological pollution accompany these operations. Instead, there may be less of an environmental impact and more economical benefits if polyP is recovered properly from the phosphorus-rich sludge. To develop an applicable polyP recovery process, the effect of the treatment on the type and chain length of polyP should be taken into consideration as the performance of polyP is largely dependent on these properties [23]. In general, the type of polyP is determined by the type of PAOs and the culture conditions, while the recovery method will affect the chain length of the obtained polyP. Herein, two recovery strategies are reviewed to provide information regarding the practical requirements for further polyP reuse.

4. Application Prospects of Biosynthetic PolyP

Until now, although polyP has been suggested as being a significant participant in various biochemical activities, such as being the activator of mitochondrial respiration regulation [24][25], the accelerating inducer of HUVEC endothelial cell tube formation [26], and the scaffold for multifunctional polyanionic protein [27], the mechanism of the biosynthesis of polyP in mammals has remained uncertain [28]. Among the various scattered functions, applying polyP as a generator and storage of metabolizable energy in the extracellular matrix (ECM) [29] in the osteoblast-led bone mineralization process [30] and supplying polyP as a functional substance for preparing procoagulants and anticoagulants in endogenous coagulation pathways [31][32] are considered as the most promising application directions of biosynthetic polyP.

References

  1. Morse, G.K.; Brett, S.W.; Guy, J.A.; Lester, J.N. Review: Phosphorus removal and recovery technologies. Sci. Total Environ. 1998, 212, 69–81.
  2. Carpenter, S.R.; Caraco, N.F.; Correll, D.L.; Howarth, R.W.; Sharpley, A.N.; Smith, V.H. Nonpoint pollution of surface waters with phosphorus and nitrogen. Ecol. Appl. 1998, 8, 559–568.
  3. Ifelebuegu, A.O.; Ojo, P. Modelling the effects of ferric salt dosing for chemical phosphorus removal on the settleability of activated sludge. J. Environ. Chem. Eng. 2019, 7, 103256.
  4. Thistleton, J.; Berry, T.A.; Pearce, P.; Parsons, S.A. Mechanisms of Chemical Phosphorus Removal II. Process Saf. Environ. Prot. 2002, 80, 265–269.
  5. Mao, Y.; Xiong, R.; Gao, X.; Jiang, L.; Peng, Y.; Xue, Y. Analysis of the Status and Improvement of Microalgal Phosphorus Removal from Municipal Wastewater. Processes 2021, 9, 1486.
  6. Novais, S.V.; Zenero, M.D.O.; Barreto, M.S.C.; Montes, C.R.; Cerri, C.E.P. Phosphorus removal from eutrophic water using modified biochar. Sci. Total Environ. 2018, 633, 825–835.
  7. Chaochun, T.; Huimin, C.; Ming, L.; Xin, Y. Research progress in the use of adsorption for dephosphorization. Ind. Water Treat. 2015, 37, 1–4.
  8. Ajmal, Z.; Muhmood, A.; Usman, M.; Kizito, S.; Lu, J.; Dong, R.; Wu, S. Phosphate removal from aqueous solution using iron oxides: Adsorption, desorption and regeneration characteristics. J. Colloid Interface Sci. 2018, 528, 145–155.
  9. Izadi, P.; Izadi, P.; Eldyasti, A. Design, operation and technology configurations for enhanced biological phosphorus removal (EBPR) process: A review. Rev. Environ. Sci. Bio/Technol. 2020, 19, 561–593.
  10. Ji, B.; Zhu, L.; Wang, S.; Qin, H.; Ma, Y.; Liu, Y. A novel micro-ferrous dosing strategy for enhancing biological phosphorus removal from municipal wastewater. Sci. Total Environ. 2020, 704, 135453.
  11. Barnard, J.L. Biological nutrient removal without the addition of chemicals. Water Res. 1975, 9, 485–490.
  12. Li, H.; Zhong, Y.; Huang, H.; Tan, Z.; Sun, Y.; Liu, H. Simultaneous nitrogen and phosphorus removal by interactions between phosphate accumulating organisms (PAOs) and denitrifying phosphate accumulating organisms (DPAOs) in a sequencing batch reactor. Sci. Total Environ. 2020, 744, 140852.
  13. Wang, X.; Wang, X.; Hui, K.; Wei, W.; Zhang, W.; Miao, A.; Xiao, L.; Yang, L. Highly Effective Polyphosphate Synthesis, Phosphate Removal, and Concentration Using Engineered Environmental Bacteria Based on a Simple Solo Medium-Copy Plasmid Strategy. Environ. Sci. Technol. 2018, 52, 214–222.
  14. Wang, L.; Shen, N.; Oehmen, A.; Zhou, Y. The impact of temperature on the metabolism of volatile fatty acids by polyphosphate accumulating organisms (PAOs). Environ. Res. 2020, 188, 109729.
  15. Ong, Y.H.; Chua, A.S.M.; Fukushima, T.; Ngoh, G.C.; Shoji, T.; Michinaka, A. High-temperature EBPR process: The performance, analysis of PAOs and GAOs and the fine-scale population study of Candidatus “Accumulibacter phosphatis”. Water Res. 2014, 64, 102–112.
  16. Kristiansen, R.; Nguyen, H.T.; Saunders, A.M.; Nielsen, J.L.; Wimmer, R.; Le, V.Q.; McIlroy, S.J.; Petrovski, S.; Seviour, R.J.; Calteau, A.; et al. A metabolic model for members of the genus Tetrasphaera involved in enhanced biological phosphorus removal. ISME J. 2013, 7, 543–554.
  17. Metcalf & Eddy; Abu-Orf, M.; Bowden, G.; Burton, F.L.; Pfrang, W.; Stensel, H.D.; Tchobanoglous, G.; Tsuchihashi, R. AECOM. In Wastewater Engineering: Treatment and Resource Recovery; McGraw Hill Education: New York, NY, USA, 2014.
  18. Li, B.; Udugama, I.A.; Mansouri, S.S.; Yu, W.; Baroutian, S.; Gernaey, K.V.; Young, B.R. An exploration of barriers for commercializing phosphorus recovery technologies. J. Clean. Prod. 2019, 229, 1342–1354.
  19. Chrispim, M.C.; Scholz, M.; Nolasco, M.A. Phosphorus recovery from municipal wastewater treatment: Critical review of challenges and opportunities for developing countries. J. Environ. Manag. 2019, 248, 109268.
  20. Egle, L.; Rechberger, H.; Krampe, J.; Zessner, M. Phosphorus recovery from municipal wastewater: An integrated comparative technological, environmental and economic assessment of P recovery technologies. Sci. Total Environ. 2016, 571, 522–542.
  21. Erdincler, A.; Seyhan, L. Agricultural use of municipal wastewater sludges: Phosphorus availability of biological excess phosphorus removal sludges. Water Sci. Technol. 2006, 54, 131–138.
  22. Kahiluoto, H.; Kuisma, M.; Ketoja, E.; Salo, T.; Heikkinen, J. Phosphorus in manure and sewage sludge more recyclable than in soluble inorganic fertilizer. Environ. Sci Technol 2015, 49, 2115–2122.
  23. Wang, D.; Li, Y.; Cope, H.A.; Li, X.; He, P.; Liu, C.; Li, G.; Rahman, S.M.; Tooker, N.B.; Bott, C.B.; et al. Intracellular polyphosphate length characterization in polyphosphate accumulating microorganisms (PAOs): Implications in PAO phenotypic diversity and enhanced biological phosphorus removal performance. Water Res. 2021, 206, 117726.
  24. Liss, E.; Langen, P. Zur Charakterisierung der Polyphosphate der Hefe. Naturwissenschaften 1959, 46, 151.
  25. Langen, P.; Liss, E. Differenzierung des Orthophosphates der Hefezelle. Biochem. Z. 1960, 332, 403–406.
  26. Liss, E.; Langen, P. Uber ein hochmolekulares Polyphosphat der Hefe. Biochem. Z. 1960, 333, 193–201.
  27. Liss, E.; Langen, P. Versuche zur polyphosphat-überkompensation in hefezellen nach phosphatverarmung. Arch. Mikrobiol. 1962, 41, 383–392.
  28. Desfougeres, Y.; Saiardi, A.; Azevedo, C. Inorganic polyphosphate in mammals: Where’s Wally? Biochem. Soc. Trans. 2020, 48, 95–101.
  29. Wang, S.; Xu, C.; Yu, S.; Wu, X.; Jie, Z.; Dai, H. Citric acid enhances the physical properties, cytocompatibility and osteogenesis of magnesium calcium phosphate cement. J. Mech. Behav. Biomed. Mater. 2019, 94, 42–50.
  30. Wang, X.; Schroder, H.C.; Muller, W.E.G. Amorphous polyphosphate, a smart bioinspired nano-/bio-material for bone and cartilage regeneration: Towards a new paradigm in tissue engineering. J. Mater. Chem. B 2018, 6, 2385–2412.
  31. Muller, F.; Mutch, N.J.; Schenk, W.A.; Smith, S.A.; Esterl, L.; Spronk, H.M.; Schmidbauer, S.; Gahl, W.A.; Morrissey, J.H.; Renne, T. Platelet polyphosphates are proinflammatory and procoagulant mediators in vivo. Cell 2009, 139, 1143–1156.
  32. Verhoef, J.J.; Barendrecht, A.D.; Nickel, K.F.; Dijkxhoorn, K.; Kenne, E.; Labberton, L.; McCarty, O.J.; Schiffelers, R.; Heijnen, H.F.; Hendrickx, A.P.; et al. Polyphosphate nanoparticles on the platelet surface trigger contact system activation. Blood 2017, 129, 1707–1717.
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Liang Zhang
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