scholarly journals Phosphorus removal enhancement by porous adsorptive mortar using miscanthus and steel slag for highly adsorptive concrete

2021 ◽  
Vol 295 ◽  
pp. 123686
Author(s):  
Fan Wu ◽  
Qingliang Yu ◽  
H.J.H. Brouwers
Keyword(s):  
Phosphorus Removal ◽  
Steel Slag

Research on the Phosphorus Removal Mechanisms and Approaches in Various Horizontal Subsurface Flow Constructed Wetlands

2012 ◽  
Vol 573-574 ◽  
pp. 599-604 ◽  
Author(s):  
Zhi Ru Tang ◽  
Yue Wen ◽  
Qi Zhou
Keyword(s):  
Phosphorus Removal ◽  
Steel Slag ◽  
Harvest Time ◽  
Phosphorous Removal ◽  
Gravel Bed ◽  
Multiple Substrates ◽  
Total Phosphorous ◽  
Removal Mechanisms ◽  
Fractionation Analysis ◽  
Optimal Harvest

This research studied that performances and mechanisms of phosphorus removal in three types of HSFCW: reed/gravel bed system (W1), multiple plants/gravel bed system (W2) and reed/multiple substrates bed system (W3). Spatial distribution and fractionation analysis of phosphorous in different substrates showed that the accumulated phosphorous in gravel, zeolite and steel slag were mainly in forms of Ca/Mg-P, residual-P and Fe/Al-P respectively. Biomass and phosphorus contained in plants harvested in early autumn was obviously higher than that contained in plants of late autumn, so the optimal harvest time should be late October. Among three systems, the phosphorus removal by adsorption and sedimentation of substrates accounted for 67%-76% of the total phosphorous removal and was the major channel for phosphorous removal. Removal by harvesting plants ranked second, accounting for 15%-21%. Other removal mechanisms accounted for about 10%. The research reveals that W3>W2>W1 in phosphorus removal efficiency in HSFCWs.

scholarly journals Numerical simulations with the P-Hydroslag model to predict phosphorus removal by steel slag filters

2017 ◽  
Vol 126 ◽  
pp. 421-432 ◽  
Author(s):  
Dominique Claveau-Mallet ◽  
Benoît Courcelles ◽  
Philippe Pasquier ◽  
Yves Comeau
Keyword(s):  
Numerical Simulations ◽  
Phosphorus Removal ◽  
Steel Slag

scholarly journals Kinetics and Thermodynamics of Efficient Phosphorus Removal by a Composite Fiber

2019 ◽  
Vol 9 (11) ◽  
pp. 2220 ◽  
Author(s):  
Yan Liu ◽  
Xiao Hu
Keyword(s):  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Steel Slag ◽  
Fixed Bed ◽  
Treatment Plant ◽  
Composite Fiber ◽  
Fixed Bed Reactor ◽  
Maximum Adsorption Capacity ◽  
Enthalpy Of Reaction ◽  
Kinetics And Thermodynamics

In the current study, we investigated the kinetics and thermodynamics of phosphorus removal by zeolite/steel slag/fly ash/basalt (ZSFB) composite fiber. Kinetic analysis indicated that the adsorption of phosphorus is best fitted with the pseudo-second-order model. The maximum adsorption capacity of the fiber calculated by the Langmuir model was found to be 4.18 mg/g and the partition coefficient was 1.49 mg/g/µM. Thermodynamics results revealed that the Gibbs free energy ΔG0 of the composite fiber was negative, indicating that the adsorption is a spontaneous process; the standard enthalpy of reaction ΔH0 was positive, indicating that the adsorption is endothermic. Adsorption under different influencing factors and desorption experiments were conducted to investigate the phosphorus removal characteristics of ZSFB composite fiber. Dynamic adsorption and the phosphorus removal experiment were also conducted in a fixed-bed reactor to study factors affecting the time of breakthrough. Results indicate that the performance of ZSFB composite fiber was not relatively outstanding compared with nanomaterials and magnetic composites. However, its performance has already met the class A demands of “discharge standard of pollutants for municipal wastewater treatment plant” (GB18918-2002) which means it can be applied to remove phosphorus from real wastewater in a cost-effective way with low-priced raw materials.

Aerated and unaerated steel slag filter systems as polishing unit for phosphorus removal from textile industrial effluent

2020 ◽  
Vol 31 ◽  
pp. 372-377
Author(s):  
Nur Ain Nazirah Mohd Arshad ◽  
Rafidah Hamdan ◽  
Wiwie Rimin ◽  
Evyna Ernastia Yaftha
Keyword(s):  
Phosphorus Removal ◽  
Steel Slag ◽  
Industrial Effluent

scholarly journals Investigation of PO43- Removal in Aerated and Unaerated High Fe EAF-Slag Filter System

2018 ◽  
Vol 7 (4.30) ◽  
pp. 557
Author(s):  
Hamdan R ◽  
Siti Zu Nurain Ahmad ◽  
Nur ‘Ain Nazirah Mohd Arshad ◽  
Wan Afnizan Wan Mohamed ◽  
Syahrul Nizam Maarup
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Steel Slag ◽  
Synthetic Wastewater ◽  
Weekly Basis ◽  
Ph Values ◽  
Main Culprit ◽  
Alkaline Conditions ◽  
Eaf Slag ◽  
Slag Column

Phosphorus in wastewater is one the main culprit which accelerates eutrophication in waterbody if it is not being treated properly. Steel slag filter emerged as one alternative treatment for wastewater. However, the variousness of metal oxides including Fe in steel slag will affect the phosphorus removal efficiency. Thus, this study was conducted to investigate the ability of a series of lab-scale high Fe electric arc furnace (EAF- slag) column filters in removing PO43- from synthetic wastewater. The systems were operated under aerated and unaerated within acidic and alkaline conditions. Synthetic wastewater contained 25 mg/L was prepared as the feed and monitored weekly basis for the PO43- removal efficiency and the total metals (Ca, Fe, and Mg) concentrations in the effluents. The results show that both aerated and unaerated high Fe EAF-slag filter systems have high PO43- removal efficiency under acidic condition, which unaerated system performed slightly better. It can be observed that unaerated systems performed better in removing PO43- at acidic and neutral pH values but not at extremely high pH. As for the PO43- removal mechanism was achieved by adsorption and precipitation at acidic pH and the concentration of Ca, Mg and Fe in effluents was related to the PO43- removal efficiency at different pH values.  

scholarly journals Enhanced Phosphorus Removal from Wastewater Using RSPRC and a Novel Reactor

2020 ◽  
Vol 10 (10) ◽  
pp. 3629
Author(s):  
Yan Liu ◽  
Limin Zhang ◽  
Rajendra Prasad Singh
Keyword(s):  
Fly Ash ◽  
Phosphorus Removal ◽  
Soil Phosphorus ◽  
Steel Slag ◽  
Industrial Wastes ◽  
Phosphorus Concentration ◽  
Previous Knowledge ◽  
Foaming Agent ◽  
Adsorption Performance ◽  
As Adsorption

Fly ash and steel slag both have a good adsorption performance and many researchers have mixed the two to make effective adsorbents. Based on previous knowledge, activated clay is added in this study. In order to deep dephosphorize wastewater, two different industrial wastes (steel slag, fly ash) are blended into activated clay as adsorption substrates, supplemented with a binder and foaming agent to prepare a Residue and Soil Phosphorus Removal Composite (RSPRC). This is prepared to carry out experimental research on the decolorization effect and phosphorus removal characteristics of RSPRC. Meanwhile, a self-developed concentric circular diversion wall adsorption reactor is implemented to study the effect of phosphorus removal. It is found that the addition of activated clay can significantly improve the phosphorus removal performance. The results suggest that the phosphorus concentration in the effluent from the reactor can be stably reduced to below 0.10 mg/L. The concentric circular diversion wall adsorption reactor and RSPRC will have broad application prospects in phosphorus removal.

Comparative research on phosphorus removal by pilot-scale vertical flow constructed wetlands using steel slag and modified steel slag as substrates

2015 ◽  
Vol 71 (7) ◽  
pp. 996-1003 ◽  
Author(s):  
Yupan Yun ◽  
Xiaoqin Zhou ◽  
Zifu Li ◽  
Sayed Mohammad Nazim Uddin ◽  
Xiaofeng Bai
Keyword(s):  
Constructed Wetlands ◽  
Phosphorus Removal ◽  
Steel Slag ◽  
Pilot Scale ◽  
Phosphorus Concentration ◽  
Vertical Flow ◽  
Phosphorus Adsorption ◽  
Vertical Flow Constructed Wetlands ◽  
Low Phosphorus ◽  
Set Up

This research mainly focused on the phosphorus removal performance of pilot-scale vertical flow constructed wetlands with steel slag (SS) and modified steel slag (MSS). First, bench-scale experiments were conducted to evaluate the phosphorus adsorption capacity. Results showed that the Langmuir model could better describe the adsorption characteristics of the two materials; the maximum adsorption of MSS reached 12.7 mg/g, increasing by 34% compared to SS (9.5 mg/g). Moreover, pilot-scale constructed wetlands with SS and MSS were set up outdoors. Then, the influence of hydraulic retention time (HRT) and phosphorus concentration in phosphorus removal for two wetlands were investigated. Results revealed that better performance of the two systems could be achieved with an HRT of 2 d and phosphorus concentration in the range of 3–4.5 mg/L; the system with MSS had a better removal efficiency than the one with SS in the same control operation. Finally, the study implied that MSS could be used as a promising substrate for wetlands to treat wastewater with a high phosphorus concentration. However, considering energy consumption, SS could be regarded as a better alternative for substrate when treating sewage with a low phosphorus concentration.

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