Long-term effects of silver nanoparticles on performance of phosphorus removal in a laboratory-scale vertical flow constructed wetland

2020 ◽  
Vol 87 ◽  
pp. 319-330 ◽  
Author(s):  
Juan Huang ◽  
Jun Xiao ◽  
Yang Guo ◽  
Wenzu Guan ◽  
Chong Cao ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Long Term Effects ◽  
Vertical Flow Constructed Wetland

scholarly journals Phosphorus removal in a vertical flow constructed wetland using dolomite powder and chippings as filter media

2015 ◽  
Vol 1 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Gražina Žibienė ◽  
Midona Dapkienė ◽  
Jurgita Kazakevičienė ◽  
Algirdas Radzevičius
Keyword(s):  
Total Phosphorus ◽  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Laboratory Scale ◽  
Laboratory Research ◽  
Vertical Flow ◽  
Filter Media ◽  
Vertical Flow Constructed Wetland ◽  
One Year

Different kinds of natural and artificial filter media are able to retain phosphorus in the constructed wetlands. Due to the fact that the constructed wetland needs huge amounts of the filter media, it is very important to find locally available material which distinguishes itself by its ability to retain phosphorus. The materials found in Lithuania were considered and dolomite was chosen. Two dolomite fractions, dolomite powder (1–2 mm) and dolomite chippings (2–5 mm), and sand media were used in the laboratory- scale installed for the comparative experiments. The laboratory-scale with dolomite as the filter media was on average by 21% more efficient in total phosphorus removal in comparison with the sand media. Based on the laboratory research pilot–scale vertical flow constructed wetland of 160 m2 was installed and planted with reed Phragmites australis. The dolomite chippings as filter media were chosen in order to avoid the danger of the clogging of constructed wetland. Efficiency of total phosphorus removal in the pilot-scale vertical flow constructed wetland was on average 95.7%, phosphates removal – 94.8% within one year.

Phosphorus removal by laboratory-scale unvegetated vertical-flow constructed wetland systems using anthracite, steel slag and related blends as substrate

2011 ◽  
Vol 63 (11) ◽  
pp. 2719-2724 ◽  
Author(s):  
Junmei Wu ◽  
Feng He ◽  
Dong Xu ◽  
Rong Wang ◽  
Xiangling Zhang ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
High Efficiency ◽  
Steel Slag ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Long Term Performance ◽  
Term Performance ◽  
P Removal

This research aimed to investigate the phosphorus (P) removal of a series of laboratory-scale unvegetated vertical-flow constructed wetland systems using anthracite, steel slag and related blends as substrate in treatment of low concentration domestic sewage. The long-term performance of P removal was firstly studied by using single substrate of anthracite or steel slag, and three systems applying various combined substrates were investigated when the average P loading rate varied between 0.9 and 1.5 g TP/m2·d. The results demonstrated that both anthracite and steel slag systems were highly effective in removing total P (TP, 77.17 ± 23.34% and 90.26 ± 4.48%) and soluble reactive P (SRP, 92.14 ± 12.56% and 96.20 ± 2.58%). The system filled with anthracite, vermiculite and steel slag from the top down removed 82.45 ± 9.52% and 87.83 ± 8.58% of TP and SRP, respectively. However, other combined substrate systems showed comparative low and fluctuant P removal. The effluent pH was maintained at 7–9, which met environmental requirements of China. Therefore, anthracite provides a long-term high efficiency of P removal and may be a promising substrate from the standpoint of the effluent pH, and the arrangement of combined substrate has a prominent effect on P removal.

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.

Removal and fate of silver nanoparticles in lab-scale vertical flow constructed wetland

Chemosphere ◽  
2019 ◽  
Vol 214 ◽  
pp. 203-209 ◽  
Author(s):  
Shaopan Bao ◽  
Lei Liang ◽  
Jiaolong Huang ◽  
Xiawei Liu ◽  
Wei Tang ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Constructed Wetland ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland

Phosphorus removal from municipal wastewater in an experimental two-stage vertical flow constructed wetland system equipped with a calcite filter

2003 ◽  
Vol 48 (5) ◽  
pp. 51-58 ◽  
Author(s):  
C.A. Arias ◽  
H. Brix ◽  
N.-H. Johansen
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Unsaturated Flow ◽  
Loading Rate ◽  
Real Life ◽  
Vertical Flow ◽  
First Order ◽  
Sedimentation Tank ◽  
Vertical Flow Constructed Wetland

Laboratory studies have indicated that calcite may be used in separate, exchangeable filter units in constructed wetland systems to remove phosphorus. Based on these studies we built a full-scale experimental constructed wetland with a calcite-based filter unit to study its performance, under real-life conditions. The system consists of a 2-m3 sedimentation tank and two vertical flow constructed wetlands. The system has three 0.09 m3 calcite filter-units to study phosphorus removal. The hydraulic loading rate varied between 1.7 and 6.2 m3/d. The residence time in filters ranged from 28 to 99 minutes. Overall the system removed 62 ± 18% of phosphorus. The removal in the calcite filter was initially good, but after three months all P-filters were saturated. The calcite increased pH by approximately half a unit and released calcium. A total of about 2.2 kg P/m3 calcite was removed by the filter. The first-stage bed receiving effluent from the sedimentation tank consistently removed phosphorus, whereas the second bed sometimes released phosphorus. The first order area-based removal rate constant for total-P in the vertical bed averaged 0.24 ± 0.20 m/d and was highly dependent on the loading rate. This shows that first order removal kinetics do not satisfactorily describe removal of phosphorus in vertical flow constructed wetland systems with unsaturated flow.

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