Treatment of olive mill and municipal wastewater mixture by pilot scale vertical flow constructed wetland

2020 ◽  
Vol 198 ◽  
pp. 126-139
Author(s):  
Ayoub El Ghadraoui ◽  
Naaila Ouazzani ◽  
Abdelaali Ahmali ◽  
Tawfiq El Hakim El Mansour ◽  
Faissal Aziz ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Olive Mill

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.

scholarly journals Performance monitoring of a vertical flow constructed wetland treating municipal wastewater

2013 ◽  
Vol 9 (3) ◽  
pp. 277-285
Keyword(s):  
Water Quality ◽  
Constructed Wetland ◽  
Performance Monitoring ◽  
Municipal Wastewater ◽  
Monitoring Program ◽  
Vertical Flow ◽  
Total Coliforms ◽  
Vertical Flow Constructed Wetland ◽  
Reliable Performance ◽  
Removal Efficiencies

A two-year monitoring program was undertaken in a vertical flow constructed wetland treating wastewater from Gomati, a village in Chalkidiki, North Greece. This constructed wetland operates since 2003. The monitoring campaigns were organized every 15 days. Water quality samples were collected at the inlet, at intermediate points (i.e., at the end of each treatment stage) and at the outlet of the system. Measured mean removal efficiencies were as follows: 92.3% for BOD, 91.7% for COD, 80.3% for TKN, 87.5% for ΝΗ4 +, 61.3% for TP, 45.7% for ortho-phosphates, 93.2% for TSS and 99.9% for total coliforms, which suggests a satisfactory and reliable performance of such systems in Greece. The paper presents facility description, study details and monitoring results.

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

scholarly journals Behaviour of physicochemical and microbiological characteristics of vertical flow constructed wetland substrate after treating a mixture of urban and Olive Mill Wastewaters

2021 ◽  
Author(s):  
Ayoub EL GHADRAOUI ◽  
Naaila OUAZZANI ◽  
Chaima SAF ◽  
Abdelaali AHMALI ◽  
Abdessamed HEJJAJ ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Pilot Scale ◽  
Olive Mill Wastewater ◽  
Vertical Flow ◽  
Urban Wastewater ◽  
Microbiological Characteristics ◽  
Olive Mill Wastewaters ◽  
Microbiological Parameters ◽  
Different Depths ◽  
Olive Mill

Abstract The aim of the current work is to evaluate the effect of a mixture of olive mill wastewater (OMWW) and urban wastewater (UW) on constructed wetland (CW) substrate physicochemical parameters and to study the abundance and behaviour of microbial community at different depths. In this regard, substrate samples were investigated at tree depth levels (0-10cm, 10-20cm and 20-30cm) inside a pilot scale CW treating the mixture. In order to compare the obtained results treating the mixture with the conventional case, a control (CW pilot plant treating only UW) was implemented. Result shows that an increase in electrical conductivity (from 134.78 to 222.33µS/cm in 0-10cm and from 131.25 to 283.33 µS/cm in 10-20cm), total dissolved salts (from 65.45 to 108.67 mg/kg in 0-10cm and from 64.33 to 135.3 mg/kg in 10–20 cm), total organic carbon (from 0.86 to 6.84%), total nitrogen (from 0.1 mg/kg to 0.45, 0.43 and 0.41 mg/kg, in 0-10cm, 10-20cm and 20-30cm respectively), and C/N ratio occurred in the substrate after the treatment of the mixture. As for the microbiological parameters, treating the mixture by CW results in the increasing of yeast and fungi concentration in the substrate which contributes probably to optimize the biodegradation of non-easily degraded organic compound such as polyphenol.

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.

Effects of effluent recirculation in vertical-flow constructed wetland on treatment efficiency of livestock wastewater

2006 ◽  
Vol 54 (11-12) ◽  
pp. 137-146 ◽  
Author(s):  
He Lian-sheng ◽  
Liu Hong-liang ◽  
Xi Bei-dou ◽  
Zhu Ying-bo
Keyword(s):  
Constructed Wetland ◽  
Ph Value ◽  
Pilot Scale ◽  
Vertical Flow ◽  
Treatment Efficiency ◽  
Livestock Wastewater ◽  
N Removal ◽  
Effluent Recirculation ◽  
Vertical Flow Constructed Wetland ◽  
Recirculation Rate

Enhancing the treatment efficiency of livestock wastewater by effluent recirculation is investigated in a pilot-scale vertical-flow constructed wetland. The wetland system is composed of downflow and upflow stages, on which narrow-leaf Phragmites communis and common reed Phragmites typhia are planted, respectively; each stage has a dimension of 4 m2 (2 m×2 m). Wastewater from the facultative pond is fed into the system intermittently at a flow rate of 0.4 m3/d. Recirculation rates of 0, 25%, 50%, 100% and 150% are adopted to evaluate the effect of the recirculation rate on pollutants removal. This shows that with effluent recirculation the average removal efficiencies of NH4-N, BOD5 and SS obviously increase to 61.7%, 81.3%, and 77.1%, respectively, in comparison with the values of 35.6%, 50.2%, and 49.3% without effluent recirculation. But the improvement of TP removal is slight, only from 42.3% to 48.9%. The variations of NH4-N, DO and oxidation–reduction potential (ORP) of inflow and outflow reveal that the adoption of effluent recirculation is beneficial to the formation of oxide environment in wetland. The exponential relationships with excellent correlation coefficients (R2>0.93) are found between the removal rates of NH4-N and BOD5 and the recirculation rates. With recirculation the pH value of the outflow decreases as the alkalinity is consumed by the gradually enhanced nitrification process. When recirculation rate is kept constant at 100%, the ambient temperature appears to affect NH4-N removal, but does not have significant influence on BOD5 removal.

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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