Sequestration of phosphorus from wastewater by cement-based or alternative cementitious materials

Wang, Xin Jun; Chen, Jiding; Kong, Yunhong; Shi, Xianming

doi:10.1016/j.watres.2014.05.021

Cited by 47 publications

(19 citation statements)

References 36 publications

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“…Phosphorus removal can be attributed to precipitation in the forms of hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) and amorphous calcium phosphate (Ca 3 (PO 4 ) 2 ) [16,17]. In the current study, Ca 2+ ions leached out of the PCPC would be responsible for phosphorus precipitation.…”

Section: Phosphorus Removal By Pcpcmentioning

confidence: 67%

Optimization of pervious concrete containing fly ash and iron oxide nanoparticles and its application for phosphorus removal

Vázquez-Rivera

Soto-Pérez

John

et al. 2015

Construction and Building Materials

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h i g h l i g h t s RSM was performed by a three-factor, two-level central composite design for PCPC. Compressive strength and void content of PCPC ranged 2.5-13.5 MPa and 12-22%. ENP Fe-surf had a positive but the least effect on the compressive strength of PCPC. Optimum PCPC ratios were at 0.34 W/B, 0.15 FA/B and 0.05 ENP/B. P removal by optimum PCPC was at K f of 2.48 mg 1À1/n kg À1 L 1/n and 1/n of 1.7. a b s t r a c tResponse surface methodology by a two-level central composite design optimized the ratios of water-to-binder (W/B), fly ash-to-binder (FA/B) and iron oxide nanoparticles-to-binder (ENP/B) for Portland cement pervious concrete (PCPC). Compressive strength, permeability, void content and density ranged 2.5-13.5 MPa, 5.3-17.4 mm/s, 12-22% and 2120-2360 kg/m 3 , respectively. W/B and FA/B had significant impacts on all the PCPC properties, whereas ENP/B produced significance only for the compressive strength. PCPC was optimized with 0.35 W/B, 0.15 FA/B and 0.05 ENP/B. The optimized PCPC exhibited enhanced phosphorus removal with the first-order removal constant at 0.031 h À1 and the Freundlich isotherm constant at 2.48 mg 1À1/n kg À1 L 1/n .

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Section: Phosphorus Removal By Pcpcmentioning

confidence: 67%

Optimization of pervious concrete containing fly ash and iron oxide nanoparticles and its application for phosphorus removal

Vázquez-Rivera

Soto-Pérez

John

et al. 2015

Construction and Building Materials

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“…Filter media with high phosphorus binding capacity is a suitable strategy to maximize phosphorus removal [2,11] in CWs. Even though a wide range of substrates have already been tested for phosphorus removal [2,4], further investigations are still necessary to obtain sustainable, cost-effective, and locally available media for CWs [2,4,12].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation of Nutrient Removal in a Full-Scale Artificial Aerated Hybrid Constructed Wetland

Zhai

Xiao

Rahaman

et al. 2016

Water

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Abstract:To improve nutrient removal, a full-scale hybrid constructed wetland (CW) consisting of pre-treatment units, vertical-baffled flow wetlands (VBFWs), and horizontal subsurface flow wetlands (HSFWs) was installed in August 2014 to treat sewage wastewater. Artificial aeration (AA) was applied continuously in the VBFW stage to improve the aerobic condition in the hybrid CW. Water samples were collected and analyzed twice a month between the period of August 2015 and July 2016. The results suggest that this new hybrid CW can achieve a satisfactory reduction of chemical oxygen demand (COD), ammonium nitrogen (NH 4 + -N), total nitrogen (TN), and total phosphorus (TP) with average removal rates of 85% ± 10% (35% ± 19 g/m 2 per day), 76% ± 18% (7% ± 2 g/m 2 per day), 65% ± 13% (8% ± 2 g/m 2 per day), and 65% ± 21% (1 g/m 2 per day), respectively. AA significantly improved the aerobic condition throughout the experimental period, and the positive influence of AA on nitrogen removal was found to be higher during summer that during winter. A significant positive correlation between water temperature and nutrient removal (p < 0.01) was observed in the system. Overall, this study demonstrates the application of AA in a full-scale hybrid CW with satisfactory nutrient removal rates. The hybrid CW system with artificial aeration can serve as a reference for future applications areas where land availability is limited.

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“…The higher adsorption intensity for the waste concrete loaded with Mg and Ca ensured a superior adsorption capability to bind phosphate (Fig. 7b) (Jung and Ahn, 2016; Wang et al, 2014). The adsorption behavior of concrete also fit a Temkin model (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…For example, domestic sewage contains phosphate levels 1.4 to 3.2 g person −1 d −1 . The density Pi adsorption for seawater modified waste concrete was 2.5 g cm −3 , and a 3‐m 3 volume of substrate could accommodate discharge from a single person (Wang et al, 2014). In this study, the maximum adsorption capacity was 29.52 mg g −1 (Supplemental Fig.…”

Section: Discussionmentioning

confidence: 99%

Using Recycled Concrete as an Adsorbent to Remove Phosphate from Polluted Water

Tang²,

Zhang

et al. 2019

J of Env Quality

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Phosphate pollution remains a significant hazard to terrestrial and aquatic ecosystems. We developed an economical and efficient method for phosphate adsorption on waste construction concrete modified with seawater. Compared with raw concrete materials, the phosphate adsorption capacity of seawater‐modified waste concrete was highly efficient, especially at low phosphate concentrations. The inflection point for seawater‐modified concrete was 0.66 and 1.22 mg L−1 for the raw material. The relative phosphate adsorption was 4.64 and 2.39 mg g−1, respectively. Phosphate removal was >90% over a pH range of 3 to 11 for the raw and modified materials. Chemical and physical analysis of the modified concrete indicated that Ca and Mg particles were uniformly sequestrated on the surface, and Ca was the determinant controlling phosphate uptake. Phosphate adsorption isotherms fit well using the Freundlich, Temkin, Elovich, Fowler–Guggenheim, and Hill–de Boer models and indicated that intermolecular forces in the concrete particles were enhanced by calcium oxides from seawater. This method can efficiently remove phosphate from polluted water and repurposes waste construction concrete. Core Ideas Phosphate adsorption capacity of modified waste concrete was highly efficient at low phosphate. Phosphate removal was >90% over a pH range of 3 to 11 for the raw and modified materials. Calcium was the determinant controlling phosphate uptake for seawater‐modified concrete. Intermolecular forces in the concrete particles were enhanced by calcium oxides from seawater.

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Sequestration of phosphorus from wastewater by cement-based or alternative cementitious materials

Cited by 47 publications

References 36 publications

Optimization of pervious concrete containing fly ash and iron oxide nanoparticles and its application for phosphorus removal

Optimization of pervious concrete containing fly ash and iron oxide nanoparticles and its application for phosphorus removal

Seasonal Variation of Nutrient Removal in a Full-Scale Artificial Aerated Hybrid Constructed Wetland

Using Recycled Concrete as an Adsorbent to Remove Phosphate from Polluted Water

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