Figure 14 - available via license: Creative Commons Attribution-NonCommercial 4.0 International
Content may be subject to copyright.
Effect of pH on adsorption capacity of phosphates (Adsorption conditions: Co = 1.2 mgP/L, adsorbent dosage 6 g/L, temp. 25˚C, time 24 hrs).
Similar publications
The purpose of this study is to measuring the chloride ion concentration in blood serum using a pair of chloride ion-sensor and reference electrode at integrating single strip (ISS). The chloride ion-sensor is offered through the chlorination process of the Ag surface on the strip to form an Ag/AgCl layers are sensitive over of chloride ion. The re...
Citations
... Typically, the normal range is 0.005-0.05 mg/L (Waweru et al., 2019). Increases in phosphorus concentrations as low as 0.08 mg/L have been demonstrated to generate the growth of algae and blooms. ...
... While PO 3--P levels of 0.08-0.10 mg/L may induce periodical blooms, TP and PO 4 3--P concentrations are less than 0.5 mg/L and 0.05 mg/L, respectively (Famoofo and Adeniyi, 2020;Waweru et al., 2019). As a result, long-period eutrophication may be avoided. ...
Phosphorus is an essential nutrient needed for agriculture and the agro-industry. Excess discharges in water bodies are the leading cause of eutrophication, and phosphorus deposits worldwide are rapidly depleting. Numerous studies have been conducted to recover phosphorus from wastewater. However, its assessment is still necessary and urgent. The purpose of this review is to give an in-depth investigation of alternative phosphorus restoration techniques. Hence, the EBPR combined with side-stream phosphorus removal had demonstrated a more significant contribution to phosphorus recovery in different forms. The procedure relies on phosphorus-accumulating organisms (PAO) richness in activated sludge to rack up many poly-phosphate within their cell interior and then recover in the side-stream. In addition, the effect of various operational parameters on side-stream phosphorus recovery efficiency and the performance of the mainstream system were detailed, including volatile fatty acids, hydraulic retention time, the amount of oxygen in aerobic conditions, nitrite, and temperature and pH condition. Ultimately, this review will help future research on phosphorus recovery to solve the severe issues of eutrophication and reduction of P resources.
... Among the pollutants, P is the major nutrient for sustaining life on earth (Waweru et al., 2019) and the normal functioning of the ecosystem (Liu and Zhang, 2015). However, excess phosphate concentration of P as 0.02-0.39 ...
... The synthetic stock phosphate concentration was prepared according to APHA (2005) by dissolving 219.5 mg anhydrous KH 2 PO 4 in 1 L deionized water (1.00 mL ¼ 50.0 μg PO 4 3--P), then a working solution was prepared through dilution. The adsorption capacity of adsorbate (phosphate ions) on the adsorbents (CIONP and PNC) was studied as a function of pH, adsorbent dose, reaction time (kinetics), and initial phosphate concentration (isotherm) (Waweru et al., 2019;Yoon et al., 2014). The parameters effect was studied in terms of pH (2-11), initial P concentration (2-100 mg/L), adsorbent dose (0.25-2 g), and contact time (5-120 min). ...
... The effect of pH on phosphate adsorption was studied over a wide range (pH ¼ 2-11) with 20 g/L adsorbents in 50 mL of 2 mg P/L solution and stirred for 1 h. The initial phosphate concentration (2 mg/L) and adsorbent dose (1 g) were selected (to start the optimization experiment) based on previous studies on related adsorbents (Waweru et al., 2019;Yoon et al., 2014). The optimum constituent phosphate adsorption was recorded at acidic pH (3), while PNC at slightly acidic (pH ¼ 6). ...
Plastics contribute a magnificent role to modern civilization, but the waste becomes a huge burden to ecology and remains intact for a thousand years. Hence, the recent movement is shifted to biodegradable plastic. In this study, an attempt was made to introduce an added value to the environment where the bio-plasticized materials were used for phosphate removal. A G-plasticized magnetic starch-based Fe3O4 clay polymer nanocomposite (PNC) was synthesized to remove phosphate from the aqueous solution. It was synthesized from activated carbon (AC), coated iron oxide nanoparticles (CIONP), nanoclay (NC), and glycerol (G) as a plasticizer. The synthesized adsorbents were characterized with UV-Vis, SEM, XRD, and FTIR. The PNC and constituent (CIONP) were tested for phosphate removal through batch adsorption experiments. The adsorption capacity increases with increasing the adsorbent dose and decreases with an increase in phosphate concentration. The synthesized PNC effectively raised the constituent optimum phosphate ion adsorption pH from acidic (pH =3) to slightly acidic (pH = 6). At the optimal pH, the CIONP and PNC maximum phosphate adsorption capacity (MPAC) was 3.12 and 2.31 mg P/g, respectively. In addition, the phosphate removal efficiency of PNC (95-45% at pH 6) was comparable to CIONP (97-58% at pH 3) under an initial 2-100 mg P/L. The adsorbents adsorption kinetics and isotherm study best described by the pseudo-second-order and Freundlich model, in turn. The SEM images support the conclusion, in which the PNC shows a heterogenous porous surface. Therefore, the adsorption mechanisms were mainly described by multilayer and chemical adsorption, such as electrostatic and ion exchange. It can be concluded that there is a positive synergistic effect between the biopolymer (starch) and nanomaterials that form the PNC. This study results propose the multiple added values of modified bio-plasticized material (with adsorbent) for environmental (phosphate) remediation.
Phosphorus to an optimum extent is an essential nutrient for all living organisms and its scarcity may cause food security, and environmental preservation issues vis-à-vis agroeconomic hurdles. Undesirably excess phosphorus intensifies the eutrophication problem in non-marine water bodies and disrupts the natural nutrient balance of the ecosystem. To overcome such dichotomy, biodegradable polymer–based adsorbents have emerged as a cost-effective and implementable approach in striking a “desired optimum-undesired excess” balance pertaining to phosphate in a sustainable manner. So far, the reports on adopting such adsorbent-approach for wastewater remediation remained largely scattered, unstructured, and poorly correlated. In this background, the contextual review comprehensively discusses the current state-of-the-art in utilizing biodegradable polymeric frameworks as an adsorbent system for phosphate removal and its efficient recovery from the aquatic ecosystem, while highlighting their characteristics-specific functional efficiency vis-à-vis easiness of synthetic and commercial viability. The overview further delves into the sources and environmental ramifications of excessive phosphorus in water bodies and associated mechanistic pathways of phosphorus removal via adsorption, precipitation, and membrane filtration enabled by biodegradable (natural and synthetic) polymeric substrates. Finally, functionality optimization, degradability tuning, and adsorption selectivity of biodegradable polymers are highlighted, while aiming to strike a balance in “removal-recovery-reuse” dynamics of phosphate. Thus, the current review not only paves the way for future exploration of biodegradable polymers in sustainable cost-effective adsorbents for phosphorus removal but also can serve as a guide for researchers dealing with this critical issue.
