Polishing of Secondary Effluent by a Two-Stage Vertical-Flow Constructed Wetland

Zhang, Chunhui; Tan, Shuhui; Li, Juan; Chen, Peng

doi:10.15244/pjoes/23868

Cited by 11 publications

(16 citation statements)

References 24 publications

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“…Overall, the maximum P sorption for all of the tested substrates increased as follows: quartz sands (III < II < I < IV) < activated carbon < zeolite < ceramic < furnace slag. The results of the present study demonstrated that the P adsorption capacities of substrates vary significantly; these findings are comparable with those reported in the literature [12,[24][25][26].…”

Section: P Adsorption Capacities Of the Substratessupporting

confidence: 92%

“…However, for the zeolite, ceramic, and furnaces slag substrates, the significant (p<0.05) decreases in P sorption of furnace slag and ceramic at high OM contents (16%) and slight (p<0.05) decreases in P sorption of ceramic could only be attributed to higher Al and Fe dissolution at lower pH. P sorption efficiency significantly decreased when the OM content was high (16%) because of the higher equilibrium pH, which was not low enough for Fe and Al dissolution [24,38]. Thus, the P sorption capacities of the substrates were also impacted by OM by influencing the pH.…”

Section: Effects Of Om On P Adsorption Capacitied Of the Substratesmentioning

confidence: 94%

“…Gray et al [38] reported that P sorption is decreased due to substrates with greater amounts of Ca at lower pH values, and becomes higher at lower pH due to substrates with greater amounts of Al and Fe. Ann et al [24] and Ugurlu and Salman [29] also reported that the precipitation of Al P and ferric P may increase at lower pH values, and lower pH values would result in lower dissolved Ca and Mg. The constant decreases in the P sorption capacities of the tested substrates at lower OM contents were mainly attributed to lower dissolved Ca concentrations at low pH and the theories presented by Erich et al [37].…”

Section: Effects Of Om On P Adsorption Capacitied Of the Substratesmentioning

confidence: 98%

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Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

Hirata¹,

Hu²

2017

Pol. J. Environ. Stud.

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CWs have been designed and constructed to use natural processes for the removal of pollutants from contaminated water in a more controlled environment [1][2][3]. Previous results have shown that substrate adsorption plays the most important role in P immobilization [4][5][6][7][8]. Therefore, cheap and effective P adsorbents are highly desirable [9][10][11].The most commonly used substrates in CWs are quartz sands [12], activated carbon (AC) [12][13], zeolite [14], ceramic [15], and furnace slag [16][17], and prior research has shown that the removal of P by these substrates mainly occurs though physical adsorption, chemical precipitation, and ion exchange [10][11]. However, P sorption properties of the substrates have not been systematically estimated, which resulted in many defective packing layer designs for CWs [3,11]. Thus, it is important to evaluate the P adsorption properties of the substrates before full-scale use was performed.Pol. J. Environ. Stud. Vol. 26, No. 3 (2017) AbstractTo provide a selection criteria to choose substrates according to the quality of the water requiring treatment in constructed wetlands (CWs), phosphorus (P) adsorption properties of four quartz sands with different physicochemical characteristics and four substrates commonly used in CWs were tested and evaluated via both the Langmuir and Freundlich equations. The effects of organic maters (OM) on P adsorption capacities of the substrates were also studied to evaluate the practical values of the substrates. The Langmuir sorption isotherm was used to estimate the P adsorption capacities of the tested substrates in CWs. Overall, the maximum P adsorption for all of the tested substrates decreased as follows: furnace slag > ceramic > zeolite > activated carbon > quartz quartz sands. The P adsorption capacities were significantly influenced by grain size; specific surface area; Fe, Al, Mg, and Ca contents in the substrates; and the amount of added OM. The chemical precipitation of P by the substrates containing Fe was more effective than those containing Ca at the same level. Added OM impacts P sorption by influencing pH, and substrates containing higher Fe and Al concentrations and lower Ca concentrations were more resistant to decreases in the P adsorption capacities due to OM accumulation. Finally, a principle for selecting substrates for the treatment of wastewater with different characteristics was determined.

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Section: P Adsorption Capacities Of the Substratessupporting

confidence: 92%

Section: Effects Of Om On P Adsorption Capacitied Of the Substratesmentioning

confidence: 94%

Section: Effects Of Om On P Adsorption Capacitied Of the Substratesmentioning

confidence: 98%

See 1 more Smart Citation

Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

Hirata¹,

Hu²

2017

Pol. J. Environ. Stud.

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“…Constructed wetlands (CWs) are recognized as a low-cost technology for treating wastewater (Faulwetter et al, 2009) and have been widely used for their low construction and operation costs, convenient management, and excellent removal efficiency. Wastewater treatment plants followed by constructed wetlands [horizontal subsurface-flow constructed wetland (Andreo-Martinez et al, 2017), subsurface flow wetland (Shan et al, 2011), horizontal flow constructed wetlands (Matamoros et al, 2017), and vertical-flow constructed wetland (Zhang et al, 2015)] are an effective advanced treatment for organic matter removal. As different wetland types have varied effects on the redox condition and could accelerate the process of biological phosphorus removal, many researchers have integrated various types of wetlands in certain systems to create hybrid-constructed wetlands in order to obtain higher treatment efficiency (Zhao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus removal performance and biological dephosphorization process in treating reclaimed water by Integrated Vertical-flow Constructed Wetlands (IVCWs)

Chen

et al. 2017

Bioresource Technology

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“…In recent years, CWs have been widely used in the purifications of nitrate-rich water and wastewater, such as agricultural runoff, municipal wastewater treatment effluent, and polluted groundwater [11][12][13][14]. Nitrate nitrogen can be removed in CWs by the multiple functions of aquatic plants, substrates, and microorganisms.…”

mentioning

confidence: 99%

How Temperature Affects Wastewater Nitrate Removal in a Bioelectrochemically Assisted Constructed Wetland System

Xu¹,

Xiao²,

Xu³

et al. 2018

Pol. J. Environ. Stud.

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Polishing of Secondary Effluent by a Two-Stage Vertical-Flow Constructed Wetland

Cited by 11 publications

References 24 publications

Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

Phosphorus Adsorption Capacity Evaluation for the Substrates Used in Constructed Wetland Systems: a Comparative Study

Phosphorus removal performance and biological dephosphorization process in treating reclaimed water by Integrated Vertical-flow Constructed Wetlands (IVCWs)

How Temperature Affects Wastewater Nitrate Removal in a Bioelectrochemically Assisted Constructed Wetland System

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