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Green and Eco-Friendly Materials for the Removal of Phosphorus from Wastewater
Published in Mu Naushad, Life Cycle Assessment of Wastewater Treatment, 2018
Khamparia Shraddha, Jaspal Dipika, Malviya Arti
In the past half century, humans have massively intervened in the global phosphorus cycle, resulting in the mobilization of about half a billion tonnes of limited phosphorus into the hydrosphere. Moreover, enhanced pollution due to excessive phosphorus content has been the motivating factor for the sustainable use of phosphorus, including recovery and recycling approaches. This challenge has been tackled by the adoption of green and eco-friendly materials for phosphorus-contaminated waste. Cordell in his extensive work demonstrated 30 different kinds of methods for the recovery of phosphorus (Cordell et al., 2011). The drawback of the old strategies for phosphorus recovery was their inability to manage the complex waste materials and residues produced during the treatment method, while some had inappropriate designs along with a high cost.
The EPS Matrix of Aerobic Granular Sludge
Published in Y.V. Nancharaiah, Vayalam P. Venugopalan, Microbial Biofilms in Bioremediation and Wastewater Treatment, 2019
Y.V. Nancharaiah, M. Sarvajith, V.P. Venugopalan
Phosphorus is an essential element in all organisms. It is mined from phosphate rocks for manufacturing chemical fertilizers for application in modern agriculture. Therefore, phosphate availability is linked to agriculture and food security. The used phosphorus is lost to the environment via animal manure, sewage and agriculture drainage. Phosphorus is a liming nutrient in natural water bodies and any input of phosphorus (i.e., sewage and agricultural drainage) into these water bodies affects natural phosphorus cycle. Lost phosphorus can promote eutrophication of water bodies, i.e., lakes, reservoirs, estuaries and oceans.
Use of fermentation processes for improving the dissolution of phosphorus and its recovery from waste activated sludge
Published in Environmental Technology, 2022
Y. Bareha, M. Saoudi, A. C. Santellani, A. Le Bihan, S. Picard, C. Mebarki, M. Cunha, M.-L. Daumer
The difference between the continuous operated experiments and the BPDP highlighted the biological contribution of PAO and other microorganisms linked to the phosphorus cycle to the phosphorus dissolution during the fermentation processes. According to the results, both BioA and DF WAS_CPR showed no significant differences on phosphorus dissolution between continuous operated experiment and BPDP, with a dissolved phosphorus average of respectively 68% ± 4% and 47% ± 2% for continuous operated experiment and 66% ± 1% and 46% ± 1% for BPDP tests at pH = 4 and pH = 5 (see Figure 2(a)). Absence of biological activity linked to phosphorus release was due to the nature of WAS_CPR. Indeed, the sludge came from a WWTP that did not use EPBR process for phosphorus removal. Thus, the sludge was not enriched with PAO and only the physicochemical transformations of phosphorus salt had an influence on dissolution. This was also supported by the BPDP control made on this sludge that showed no significant phosphorus release under anaerobic conditions.
Climate change effects on the thermal stratification of Lake Diefenbaker, a large multi-purpose reservoir
Published in Canadian Water Resources Journal / Revue canadienne des ressources hydriques, 2021
L. A. Morales-Marin, M. Carr, A. Sadeghian, K. E. Lindenschmidt
The kinematics of elements such as phosphorus, nitrogen, sulphur and silica is mostly modulated by water temperature in lake ecosystems (e.g. Sahoo et al. 2011). The reported increases in water temperature are projected to decrease solubility of gases such as oxygen, and processes such as denitrification and nitrogen fixation may become accelerated. Rises in water temperature in LD can reduce DO concentration, increasing reaction rates and affecting the equilibrium of chemical reactions and nutrient cycling. For instance, as the phosphorus cycle is sensitive to DO, short anoxic periods can trigger resuspension of sediment bottom phosphorous and eventually cause the lake to become eutrophic. Such changes can eventually cause water quality standards to deteriorate in the lake in the following decades.
Adsorption of phosphates from water by two polymer-silicate composites
Published in Bioremediation Journal, 2020
Kalpani E. H. Wijesinghe, Rasika E. A. Dissanayake, Sithy S. Iqbal, Namal Priyantha, Mohamed C. M. Iqbal
Methods available to remove phosphate from wastewater include chemical treatment (Caravelli, Contreras, and Zaritzky 2010), enhanced biological phosphorus removal by polyphosphate accumulating organisms (Caravelli, Contreras, and Zaritzky 2010; Oehmen et al. 2007), and adsorption processes (Yoon et al. 2018; Liu et al. 2020; Jang and Lee 2019). The synthetic adsorbent, Fe(OH)3, has a 100% adsorption efficiency for phosphate and a maximum adsorption capacity of 65 mg/g (Yoon et al. 2018). A lanthanum-chitosan adsorbent was reported with maximum adsorption capacity of 31.01 mg g−1 at pH 6 (Liu et al. 2020). Jang and Lee (2019) developed chitosan/Ca-organically modified montmorillonite beads for phosphate adsorption and it show high affinity for phosphate. He et al. (2020) prepared a Ce(III) nanocomposite by partial thermal decomposition of Ce-MOF. Even though this composite has a high phosphate adsorption capacity, the synthesis of the composite requires high temperatures of 400 °C and 500 °C. It is also necessary that the adsorbed phosphorus is in an available form so that the phosphorus-loaded adsorbents are useful as agriculture fertilizers. Biochar derived from sugar beet tailings showed a phosphate removal efficiency of 73% from an aqueous solution of potassium phosphate (Yao et al. 2011). This would ensure that the open-ended phosphorus cycle is closed to recycle the globally depleting phosphorus. Of the methods available, the adsorption process is environmentally friendly, economical, requires minimum labor and in most cases, the end products are not harmful and biodegradable. They are also effective at low concentrations of phosphates.