Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Ahmadi, Abbas; Yang, Wenwen; Jones, Spencer; Wu, Tingting

doi:10.1007/s42114-018-0042-5

Cited by 21 publications

(5 citation statements)

References 59 publications

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“…This shows that the contaminants on the highway surface neutralized the pH of direct rain. The low pH rainwater has SO 4 , which corrodes heavy metals and, as a result, neutralizes the stormwater (Ahmadi et al 2018). The pH of highway runoffs at each site remained within the environmental quality standards (Fig.…”

Section: Contaminant Event Mean Concentrationsmentioning

confidence: 94%

“…These high suspended solid concentrations increase the mortality rate of flora and fauna in the receiving stream by physically covering the benthic zone habitat (Chapman et al 2017). Various studies have reported the toxicity due to metals-laden suspended solid discharged into the streams (Ahmadi et al 2018). Chloride, chemical oxygen demand, and tot-N remained within the environmental quality standards at all the highway segments.…”

Section: Contaminant Event Mean Concentrationsmentioning

confidence: 99%

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Investigation of contaminant profile in highway stormwater runoff and risk assessment by statistical analysis

Iqbal

Saleem

Bahadar

et al. 2022

Int. J. Environ. Sci. Technol.

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Highway stormwater runoff pollution has become a severe risk factor for water bodies nowadays. The conventional risk analysis protocols for directly discharging highway runoff are prone to systematic and judgmental errors. Therefore, a numeric and straightforward risk assessment protocol has been developed in this study that minimizes the errors. For this study, three highway segments were selected in the city of Rawalpindi, Pakistan. Event mean concentrations have been used as baseline numeric values for calculating the risk of discharging highway stormwater directly into the water bodies. These values are also correlated with highway characteristics (area, slope, and traffic count) and storm characteristics (storm depth, cumulative runoff volume, antecedent dry days, and cumulative flow). The highway stormwater was monitored for organics, metals, solids, and macro-nutrients at three highway sections. The event mean concentrations of dissolved organic carbon (50–145 mg/L), total suspended solids (1500–3900 mg/L), chromium (0.25–0.45 mg/L), and lead (0.1–0.8 mg/L) are found to be higher than the environmental quality standards. The risk assessment was conducted by the analysis of variance. The analysis showed that the highway characteristics significantly affect contaminant concentrations, but storm characteristics on contaminant concentrations are not found to be significant. Total suspended solids are the most threatening contaminant in highway runoffs. The study concluded that the risk from contaminants in highway stormwater depends particularly on the specific highway sections’ properties. The first flush portion (initial 25% of runoff) of highway runoff poses a higher threat to the receiving environment than the later runoff volumes.

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Section: Contaminant Event Mean Concentrationsmentioning

confidence: 94%

Section: Contaminant Event Mean Concentrationsmentioning

confidence: 99%

Investigation of contaminant profile in highway stormwater runoff and risk assessment by statistical analysis

Iqbal

Saleem

Bahadar

et al. 2022

Int. J. Environ. Sci. Technol.

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“…3 The predicted high demand of magnesium is also from its high demand in other fields, for example, paper manufacturing, fertilizer production, 4−6 and water/wastewater treatment. 7,8 Natural magnesium sources are magnesium-bearing ores, for example, dolomite, magnesite, brucite, and magnesium-containing waters, for example, salt lake brines, seawater, and geothermal water. 1,9 Besides, municipal and industrial wastewater can also be a significant source of magnesium but is often neglected.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Magnesium (Mg) is used in alloys with aluminum (Al) to make the cars lighter and also in new types of batteries; thus, its demand and price are predicted to grow rapidly over the next decades . The predicted high demand of magnesium is also from its high demand in other fields, for example, paper manufacturing, fertilizer production, − and water/wastewater treatment. , Natural magnesium sources are magnesium-bearing ores, for example, dolomite, magnesite, brucite, and magnesium-containing waters, for example, salt lake brines, seawater, and geothermal water. , …”

Section: Introductionmentioning

confidence: 99%

Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage

Tran

et al. 2021

ACS Sustainable Chem. Eng.

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Municipal and industrial wastewater can be a potential source of magnesium. Therefore, the development of magnesium recovery technology can both release the burden of wastewater treatment and help recycle the metal, which is in highmarket demand. Also, the recovery of magnesium in the form of magnesium carbonate has an implication on carbon capture and storage (CCS). In this study, fluidized bed homogeneous crystallization (FBHC) was employed for the recovery of magnesium from actual industrial effluent. The optimal conditions for the operation of FBHC were pH, 11.3; [Mg 2+ ]/[CO 32− ], 1.2; surface loading rate, 1.8 kg/m 2 h; and upflow velocity, 15.5 m/h, where the total recovery (TR) and crystallization (CR) efficiencies reached 88.5 and 85.4%, respectively. The recovered products were of high purity (93.5%) and in the form of nesquehonite (MgCO 3 •3H 2 O) pellets (size 1.2 mm), which could be further reused easily. From the scanning electron microscopy analysis, it was observed that they possessed a round shape and a smooth surface. In summary, FBHC is a promising recovery technology for magnesium-rich wastewater, where carbon capture and storage can be simultaneously integrated.

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“…Because the legislative standards for discharging nutrients into the environment are becoming increasingly stricter, a significant amount of scientific effort is going toward their removal. For example, N and P removal from different water matrices has been studied using biological nitrification and denitrification, metal ion precipitation, adsorption, , ammonia stripping, electrochemical conversion, − ion exchange and microbial electrolysis. , One of the clean and effective methods of nitrogen removal from wastewater is electrochemical redox. The nitrate and ammonium ions can be converted to nontoxic nitrogen gas on active materials, such as Cu, Sn, and Ni metals or oxides .…”

Section: Introductionmentioning

confidence: 99%

Applying a Novel Sequential Double-Column Fluidized Bed Crystallization Process to the Recovery of Nitrogen, Phosphorus, and Potassium from Swine Wastewater

et al. 2020

ACS EST Water

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Given the potential shortage of critical nutrients (e.g., nitrogen, phosphorus, and potassium) predicted in the near future, nutrient recovery technologies have attracted wide attention from the scientific community. In this study, a novel sequential double-column fluidized bed homogeneous crystallization (SDC-FBHC) process was developed for the simultaneous recovery of nitrogen (N), phosphorus (P), and potassium (K) from actual swine wastewatera nutrient-rich source. Studied variables included pH, reaction time, ammonia release, Mg:P ratios, and up-flow velocity. Under conditions including pH 8.5–10.5, a Mg:P ratio of 1.4, a P:K ratio of 1.25, an up-flow velocity of 30 m/h, and base on the initial N, P, and K concentrations of 515.6, 95.5, and 334.5 mg/L, respectively, the maximum total removal (TR%) of N, P, and K reached 90.12%, 95.5%, and 62.7%, respectively, and the crystallization ratios (CR%) were 85.6%, 92.4%, and 52.8%, respectively. The sequential double-column fluidized bed homogeneous crystallization products were composed of crystal magnesium ammonia phosphate (MAP, MgNH4·PO4·6H2O, purity > 71.1 ± 2%, size 1.0 mm) and magnesium potassium phosphate phase (MPP, MgKPO4·6H2O, purity > 67.7 ± 3%, size 0.95 mm), which are ready for use as a slow-release fertilizer. The modeling of the minimum fluidization velocity resulted in values of 1.4–1.8 and 1.6–2.0 times that of the up-flow velocity for the effective fluidization of magnesium ammonia phosphate and magnesium potassium phosphate, respectively. The estimated profit for simultaneous recovery of N, P, and K from swine wastewater using the sequential double-column fluidized bed homogeneous crystallization process was 1.324 USD/m3-swine wastewater.

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Separation-free Al-Mg/graphene oxide composites for enhancement of urban stormwater runoff quality

Cited by 21 publications

References 59 publications

Investigation of contaminant profile in highway stormwater runoff and risk assessment by statistical analysis

Investigation of contaminant profile in highway stormwater runoff and risk assessment by statistical analysis

Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage

Applying a Novel Sequential Double-Column Fluidized Bed Crystallization Process to the Recovery of Nitrogen, Phosphorus, and Potassium from Swine Wastewater

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