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.

Removal of arsenic by pilot-scale vertical flow constructed wetland

2021 ◽  
Vol 15 (4) ◽  
Author(s):  
Yaocheng Fan ◽  
Tiancui Li ◽  
Deshou Cun ◽  
Haibing Tang ◽  
Yanran Dai ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Pilot Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Removal Of Arsenic

Gravel Media Filtration as a Constructed Wetland Component for the Reduction of Suspended Solids from Maturation Pond Effluent

1994 ◽  
Vol 29 (4) ◽  
pp. 55-66 ◽  
Author(s):  
D. P. Sapkota ◽  
H. J. Bavor
Keyword(s):  
Constructed Wetland ◽  
Suspended Solids ◽  
Experimental Period ◽  
Pilot Scale ◽  
Application Rate ◽  
Surface Flow ◽  
Laboratory Scale ◽  
Application Rates ◽  
Media Component ◽  
Scale Experiment

Experiments were carried out in a horizontal gravel media filter (GMF) with media size ranging from 5-40 mm. Such gravel-based, sub-surface flow units have been used in both planted and unplanted formats in a range of constructed wetland systems. This GMF was subjected to various hydraulic application rates ranging from 1 m3/(m2.d) to 36 m3/(m2.d) over a twc-year period. The range of suspended solids (SS) concentration was 2-36 mg/l and that of turbidity (NTU) was 3-44 during the experimental period. The average removal of suspended solids varied from 30-86%. It was observed that SS was reduced by a maximum of 86% at an application rate of 13m3/(m2.d), within the above noted SS range. An additional laboratory scale experiment was carried out with artificially grown algae in a vertical perspex tube of 190 mm inner diameter (I.D.) in upward flow condition. Results from the laboratory scale and pilot scale experiments are presented and discussed. The study demonstrates that a constructed wetland format with a subsurface flow and horizontal gravel media component could be used as an alternative method for reducing suspended solids from maturation pond effluent

The behaviour of heavy metals and phosphorus in an ash melting process

1997 ◽  
Vol 36 (11) ◽  
pp. 275-282 ◽  
Author(s):  
Masaki Takaoka ◽  
Nobuo Takeda ◽  
Satoshi Miura
Keyword(s):  
Heavy Metals ◽  
Bottom Ash ◽  
Melting Furnace ◽  
Melting Process ◽  
Pilot Scale ◽  
Ceramic Filter ◽  
Stable Form ◽  
Zn And Cu In ◽  
Ash Melting ◽  
Scale Experiment

In this study, the bottom ash from wastewater treatment sludge was examined to investigate the behavior of heavy metals and phosphorus in the melting process by a lab-scale as well as a pilot-scale experiment. The lab-scale experiment was performed in air or argon at temperatures from 800 to 1500 °C using an electric furnace and crucibles. The proportions of heavy metals remaining in the slag after the melting were effected by the compositions of the ash, especially basicity (CaO/SiO2). The proportion of Cd, Pb, Zn and Cu in the residue increased with the elevated basicity. Phosphorus did not volatilized by the melting process, and remained as a stable form, Ca3(PO4)2 by conjugating with Ca. Pilot-scale tests were also performed using swirling type melting furnace at 1400°C. The volatile heavy metals, like Cd, Pb and As were found in the dust collected by ceramic filter, whereas Zn, Cr and Mn were combined into the slag by the melting process.

scholarly journals Downflow Hanging Sponge (DHS) Reactor for Wastewater Treatment - A Short Review

2019 ◽  
Vol 280 ◽  
pp. 05004 ◽  
Author(s):  
Awaluddin Nurmiyanto ◽  
Akiyoshi Ohashi
Keyword(s):  
Wastewater Treatment ◽  
Process Development ◽  
Short Review ◽  
Pilot Scale ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Combined System ◽  
Wastewater Treatment Process ◽  
Good Efficiency ◽  
Scale Experiment

A combination of upflow anaerobic sludge blanket (UASB) and downflow hanging sponge (DHS) reactor has emerged as an interesting alternative wastewater treatment process. The combined system not only exhibited good organic removal performance in pilot scale experiment, moreover, several studies in the last decades also showed the good efficiency and robustness of DHS reactor in full-scale operation for wastewater treatment. This paper provides a review on the basic concept, historical process development and application of the DHS reactor for wastewater treatment. Over twenty-year development of DHS technology suggests that DHS reactor had become a viable alternative not only solving the sanitation problems in developing countries but also great further potential development in the field of resources recovery technologies from wastewater.

REMOVAL OF ARSENIC AND HEAVY METALS FROM ARSENICCONTAINING ACID WASTEWATER WITH IRON SALT AND LIME

2019 ◽  
Vol 18 (12) ◽  
pp. 2655-2662
Author(s):  
Yongliang Wang ◽  
Peiwei Han ◽  
Yonggang Lu ◽  
Li Xiao ◽  
Yingchao Du ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Iron Salt ◽  
Removal Of Arsenic

Performance of constructed wetland for selenium, nutrient and heavy metals removal from mine effluents

Chemosphere ◽  
2021 ◽  
pp. 130921
Author(s):  
Selma Etteieb ◽  
Mehdi Zolfaghari ◽  
Sara Magdouli ◽  
Kamalpreet Kaur Brar ◽  
Satinder Kaur Brar
Keyword(s):  
Heavy Metals ◽  
Constructed Wetland ◽  
Heavy Metals Removal ◽  
Metals Removal

Experimental Study on Utilization FGD Byproducts in Building Bricks

2010 ◽  
Vol 150-151 ◽  
pp. 753-757 ◽  
Author(s):  
Xiong Hao Li ◽  
Yong Jie Xue ◽  
Min Zhou
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Optimum Design ◽  
Power Plants ◽  
Pilot Scale ◽  
Mixture Composition ◽  
Technical Requirement ◽  
Do No Harm ◽  
Maximum Compressive Strength ◽  
Scale Experiment

This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.

scholarly journals Pilot-scale study of vertical flow constructed wetland combined with trickling filter and ferric chloride coagulation: influence of irregular operational conditions

2015 ◽  
Vol 71 (7) ◽  
pp. 1088-1096 ◽  
Author(s):  
B. Kim ◽  
M. Gautier ◽  
G. Olvera Palma ◽  
P. Molle ◽  
P. Michel ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Water Saturation ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Saturation Level ◽  
Vertical Flow ◽  
Trickling Filter ◽  
Operational Conditions ◽  
Vertical Flow Constructed Wetland

The aim of this study was to characterize the efficiency of an intensified process of vertical flow constructed wetland having the following particularities: (i) biological pretreatment by trickling filter, (ii) FeCl3 injection for dissolved phosphorus removal and (iii) succession of different levels of redox conditions along the process line. A pilot-scale set-up designed to simulate a real-scale plant was constructed and operated using real wastewater. The influences of FeCl3 injection and water saturation level within the vertical flow constructed wetland stage on treatment performances were studied. Three different water saturation levels were compared by monitoring: suspended solids (SS), total phosphorus (TP), dissolved chemical oxygen demand (COD), ammonium, nitrate, phosphate, iron, and manganese. The results confirmed the good overall efficiency of the process and the contribution of the trickling filter pretreatment to COD removal and nitrification. The effects of water saturation level and FeCl3 injection on phosphorus removal were evaluated by analysis of the correlations between the variables. Under unsaturated conditions, good nitrification and no denitrification were observed. Under partly saturated conditions, both nitrification and denitrification were obtained, along with a good retention of SSs. Finally, under saturated conditions, the performance was decreased for almost all parameters.

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