The bioaccumulation performance of reeds in a pilot scale Constructed Wetland for removal of heavy metals in polluted river treatment (Xi’an, China)

2015 ◽  
pp. 1071-1075
Author(s):  
Guanghuan Ge ◽  
Aixia Chen ◽  
Jianqiang Zhao
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Pilot Scale ◽  
Polluted River ◽  
Removal Of Heavy Metals

Kinetics of Heavy Metals Adsorption on Gravels Derived From Subsurface Flow Constructed Wetland

2020 ◽  
pp. 193-213
Author(s):  
Celestin Defo ◽  
Ravinder Kaur
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Contact Period ◽  
Batch Experiments ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Adsorption Rates ◽  
Kinetics Of ◽  
Best Fit ◽  
Concentration Levels

Adsorption kinetics of Ni, Cr, and Pb on gravels collected from constructed wetland was studied at varied metal concentrations and contact period for estimating the removal of heavy metals from wastewater. Batch experiments were conducted by shaking 120 ml of metal solutions having 5 concentration levels each of Ni (1.0, 2.0, 3.5, 5.0 and 6.0 mg l-1), Cr (1.0, 2.0, 3.0, 4.5 and 6.0 mg l-1), and Pb (1.0, 3.0, 6.0, 8.0 and 12.0 mg l-1) with 50 g of gravels for as function of time. Adsorption of Ni, Cr, and Pb on gravels ranged from 34.8 to 47.2, 42.7-54.9, and 47.5-56.9%, indicating their removal in the order: Pb > Cr > Ni. Freundlich model showed a good fit for Ni and Cr (R2>0.9) while Langmuir model fitted better for Pb (R2= 0.7). The pseudo-second-order model showed the best fit to simulate the adsorption rates of these metals on gravel.

Floating constructed wetland for the treatment of polluted river water: A pilot scale study on seasonal variation and shock load

2016 ◽  
Vol 287 ◽  
pp. 62-73 ◽  
Author(s):  
Tanveer Saeed ◽  
Biprojit Paul ◽  
Rumana Afrin ◽  
Abdullah Al-Muyeed ◽  
Guangzhi Sun
Keyword(s):  
Seasonal Variation ◽  
River Water ◽  
Constructed Wetland ◽  
Pilot Scale ◽  
Shock Load ◽  
Polluted River

scholarly journals Simultaneous Removal of Heavy Metals And Bioelectricity Generation In Microbial Fuel Cell Coupled With Constructed Wetland: An Optimization Study On Substrate And Plant Types

2021 ◽  
Author(s):  
Lu Wang ◽  
Dayong Xu ◽  
Qingyun Zhang ◽  
Tingting Liu ◽  
Zhengkai Tao
Keyword(s):  
Heavy Metals ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Constructed Wetland ◽  
Water Hyacinth ◽  
Plant Roots ◽  
Optimization Study ◽  
Removal Of Heavy Metals ◽  
Metal Treatment ◽  
Optimal Construction

Abstract A microbial fuel cell coupled with constructed wetland (CW-MFC) was built to remove heavy metals (Zn and Ni) from sludge. The performance for the effects of substrates (granular activated carbon (GAC), ceramsite) and plants (Iris pseudacorus, Water hyacinth) towards the heavy metal treatment as well as electricity generation were systematically investigated. The CW-MFC systems possessed higher Zn and Ni removal efficiencies as compared to CW. The maximal removal rates of Zn (76.88%) and Ni (66.02%) were obtained in system CW-MFC based on GAC and Water hyacinth (GAC- and WH-CW-MFC). Correspondingly, the system produced the maximum voltage of 534.30 mV and power density of 70.86 mW·m-3, respectively. Plant roots and electrodes contributed supremely to the removal of heavy metals, especially for GAC- and WH-CW-MFC systems. The coincident enrichment rates of Zn and Ni reached 21.10% and 26.04% for plant roots, 14.48% and 16.50% for electrodes, respectively. A majority of the heavy metals on the sludge surface were confirmed as Zn and Ni. Furthermore, the high-valence Zn and Ni were effectively reduced to low-valence or elemental metals. This study provides a theoretical guidance for the optimal construction of CW-MFC and the resource utilization of sludge containing heavy metals.

Retention and distribution of Cu, Pb, Cr, and Zn in a full-scale hybrid constructed wetland receiving municipal sewage

2013 ◽  
Vol 67 (10) ◽  
pp. 2257-2264
Author(s):  
Haiwen Xiao ◽  
Shengli Zhang ◽  
Jun Zhai ◽  
Qiang He ◽  
Adriaan Mels ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Manganese Oxides ◽  
Free Water ◽  
Municipal Sewage ◽  
Plant Tissues ◽  
Water Stream ◽  
Wastewater Treatment Process ◽  
Metal Concentrations ◽  
Removal Of Heavy Metals

This study was conducted to investigate the retention and distribution of Cu, Pb, Cr, and Zn in a hybrid constructed wetland (CW) that consists of both vertical baffled flow wetlands (VBFWs) and horizontal subsurface flow wetlands (HSSFs) with unique flow regimes and oxygen distribution. The heavy metal concentrations in water, sediments, and plant tissues in the hybrid CW were analysed. The removal of heavy metals from the water stream in the monitoring period was not statistically significant. Metal concentrations in the sediments generally decreased along the wastewater treatment process. The reductive anaerobic condition in the VBFW may promote the sulphate reduction and form highly insoluble Cu, Pb, and Zn sulphides, resulting in the higher concentration of the bivalent cations in the VBFW sediments than the corresponding values in the HSSF; however, the aerobic and anoxic environments in the HSSF enhanced the removal of Cr with the co-precipitation of iron and manganese oxides, and their hydroxides. Metal concentrations in plant tissues were not significantly influenced by the concentrations in sediments, while roots contained statistically higher metal concentrations than stems and leaves. The sediments stored 94.01, 86.31, 95.85, and 89.51% of the total Cu, Pb, Cr, and Zn retained in the hybrid CW system, respectively, while only small fractions (<10%) were accumulated in the harvestable macrophyte tissues. It is important to clean not only the accessible sediments in free water surface tank and ponds but also the embedded sediments in vegetated beds for the sustainable removal of heavy metals.

scholarly journals Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland

Minerals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 379 ◽  
Author(s):  
Ha Nguyen ◽  
Bien Nguyen ◽  
Thuy Duong ◽  
Anh Bui ◽  
Hang Nguyen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Pilot Scale ◽  
Common Reed ◽  
X Ray Diffraction ◽  
Combined System ◽  
Constant Flow Rate ◽  
Mining Wastewater ◽  
Scale Experiment ◽  
Removal Of Arsenic

This study was conducted to assess the removal of arsenic (As) and heavy metals from mining wastewater by the combination of adsorption, using modified iron-ore drainage sludge, and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment with a constant flow rate of 5 m3/day was operated for four months using real wastewater from a Pb–Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in wastewater and plant. X-ray diffraction (XRD), surface charge measurements (by a particle charge detector (PCD)), Fourier-transform infrared (FTIR), and surface area Brunauer–Emmet–Teller (BET) measurements were performed to determine the characteristics of the adsorbent. The results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established by the QCVN 40:2011/BTNMT for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater.

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