Performance of a sub-surface flow constructed wetland in polishing pre-treated wastewater—a tropical case study

2004 ◽  
Vol 38 (3) ◽  
pp. 681-687 ◽  
Author(s):  
M.E Kaseva
Keyword(s):  
Constructed Wetland ◽  
Surface Flow ◽  
Treated Wastewater

scholarly journals Constructed Wetlands as Sustainable Technology for the Treatment and Reuse of the First-Flush Stormwater in Agriculture—A Case Study in Sicily (Italy)

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2542 ◽  
Author(s):  
Teresa Tuttolomondo ◽  
Giuseppe Virga ◽  
Mario Licata ◽  
Claudio Leto ◽  
Salvatore La Bella
Keyword(s):  
Constructed Wetland ◽  
Irrigation Water ◽  
Pollutant Removal ◽  
Giant Reed ◽  
Treated Wastewater ◽  
First Flush ◽  
Good Efficiency ◽  
Metal Levels ◽  
Aesthetic Characteristics

This paper describes a case study that was carried out on a Sicilian company (Italy) dealing with separate waste collection and recycling of glass. The aims of this study were to evaluate the overall efficiency of a vertical subsurface flow system (VSSFs) constructed wetland (CW) operating for the treatment of first-flush stormwater and the effects of treated wastewater on the morphological and aesthetic characteristics of ornamental pepper and rosemary plants. The system had a total surface area of 46.80 m2 and was planted with common reed and giant reed. Wastewater samples were taken from October 2018 to July 2019 at the CW inlet and outlet for chemical-physical and microbiological characterization of the wastewater. Two separate experimental fields of rosemary and ornamental pepper were set up in another Sicilian location. Three sources of irrigation water, two accessions of rosemary and two varieties of ornamental pepper were tested in a split-plot design for a two-factor experiment. The results showed very high organic pollutant removal (BOD5 75–83%, COD 65–69%) and a good efficiency of nutrients (TN 60–66%) and trace metals (especially for Cu and Zn) removal. Escherichia coli concentration levels were always lower than 100 CFU 100 mL−1 during the test period. Irrigation water and plant habitus had significant effects on all the morphological and aesthetic characteristics of the plants. For both the crops, plants irrigated with freshwater and treated wastewater had greater growth and showed a better general appearance in comparison with plants irrigated with wastewater. The higher trace metal levels in the wastewater produced adverse effects on plant growth and reduced the visual quality of the plants. Our results suggest the suitability of a VSSFs constructed wetland for the treatment of first-flush stormwater and the reuse of treated wastewater for irrigation purposes, in accordance with legislation requirements concerning wastewater quality.

scholarly journals Studying the properties of constructed wetland sediments for their possible application as fertilizers

2007 ◽  
pp. 167-179
Author(s):  
Yuriy Vergeles ◽  
Nataliya Butenko ◽  
Andriy Ishchenko ◽  
Lidiya Svirenko ◽  
Felix Stolberg ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Typha Latifolia ◽  
Surface Flow ◽  
Treated Wastewater ◽  
Septic Tank ◽  
Wetland Soil ◽  
Pathogenic Microorganisms ◽  
Artificial Lake ◽  
Wetland Site ◽  
Sediment Formation

The processes of sediment formation and their biogeochemical properties were studied in2005-2007 at the experimental constructed wetland site ("Bioplato") designed for treatment ofdomestic effluents in Ukraine, nearby the city of Kharkiv. The constructed wetland consists ofthree units: one with vertical filtration applying fine gravel (0.5 m in depth) and coarse sand(0.3 111) as filtering media, one with horizontal filtration applying middle sand (0,8 m) as afiltering medium, and one surface flow unit with natural wetland soil applied, The site alsoincludes a septic tank and a small sludge-drying field. The constructed wetland with acapacity of 50 1113 of treated domestic wastewater per day was established in 1998 and sincethen it has been operated continuously until now. Macrophytes were planted in I 998-200 I,and recently the reed (Phragmites australis), cattail (Typha latifolia), and a number of sedgespecies (Carex Jpp.) dominate over the rest of ca. 30 plant species with average cover of 85-90%. Treatment efficiency of 90-95% of BOD5 and suspended solids removal, as well as 98-99% of removal of pathogenic microorganisms allows discharging the treated wastewater intoadjacent artificial lake, Sludge was sampled at each unit followed with standard laboratoryanalyses of its main characteristics: total organic carbon (TOC), total nutrients (N, P),contents of trace elements, abundance of pathogenic microorganisms, and general toxicity.The results of analyses confirmed that the top layer of sludge from each unit of the assessedconstructed wetland site could be used as a source of fertilizers for grain and leguminouscrops.

Evaluation of the long-term performance in a large-scale integrated surface flow constructed wetland–pond system: A case study

2020 ◽  
Vol 309 ◽  
pp. 123310
Author(s):  
Yiping Li ◽  
Haikuo Zhang ◽  
Liqin Zhu ◽  
Hongwei Chen ◽  
Guanchao Du ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Large Scale ◽  
Surface Flow ◽  
Pond System ◽  
System A ◽  
Long Term Performance ◽  
Term Performance

Study on the Surface Flow Constructed Wetland Wastewater Treatment of Furfural Wastewater

2011 ◽  
Vol 281 ◽  
pp. 233-236
Author(s):  
Ju Wei Peng ◽  
Xiang Kui Han
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Ph Value ◽  
Removal Rate ◽  
Surface Flow ◽  
Treated Wastewater ◽  
Wetland Treatment ◽  
Cod Removal Rate ◽  
Research Show

According to the characteristics of furfural wastewater, by production enterprises located in low-lying saline land transformed into a surface flow constructed wetlands, the waste water in the wetland approach to natural consumption, no efflux, treated waste water equal to the wetland wastewater by natural evaporation, plant transpiration and plant storage Volume. Research show that, after wetland treatment the wastewater COD removal rate to an average of 94%, TN removal rate to an average of 65%, PH value of treated wastewater is 6.22, the use of surface flow constructed wetland wastewater treatment is feasible ecological processing technology for furfural.

COD, nutrient removal and disinfection efficiency of a combined subsurface and surface flow constructed wetland: A case study

2015 ◽  
Vol 18 (4) ◽  
pp. 416-422 ◽  
Author(s):  
Laura Sartori ◽  
Sergio Canobbio ◽  
Riccardo Fornaroli ◽  
Riccardo Cabrini ◽  
Francesca Marazzi ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Nutrient Removal ◽  
Surface Flow

Wastewater treatment and nutrient removal in the combined reactor

1998 ◽  
Vol 38 (1) ◽  
pp. 87-95 ◽  
Author(s):  
M. Roš ◽  
J. Vrtovšek
Keyword(s):  
Organic Compounds ◽  
Industrial Wastewater ◽  
Design Procedure ◽  
Order Reaction ◽  
Treated Wastewater ◽  
Nitrification Rate ◽  
Zero Order Reaction ◽  
Aerobic Reactor ◽  
Complex Organic

A combined anaerobic anoxic aerobic reactor for the treatment of the industrial wastewater that contains nitrogen and complex organic compounds as well as its design procedure is presented. The purpose of our experiments was to find a simple methodology that would provide combined reactor design. The reactor is based on the combination of anaerobic, anoxic and aerobic process in one unit only. It was found that the HRT even under 1 hour in the anaerobic zone is long enough for the efficient transformation of complex organic compounds into readily biodegradable COD which is then used in dentrification process. In the N-NO3 concentration range 1.5-50 mg/l the denitrification rate could be expressed as half-order reaction when the CODrb was in excess. N-NO3 removal efficiency is controlled by the recycle flow from the aerobic to the anoxic zone. Nitrification rate can be expressed as first, half or zero-order reaction with respect to effluent N-NH4 concentration. Nitrification rate depends on the dissolved oxygen concentration and hydrodynamic conditions in the reactor. Case study for design of a pilot plant of the combined reactor for treatment of pre-treated pharmaceutical wastewater is shown. Characteristics of pre-treated wastewater were: COD=200 mg/l, BOD5=20 mg/l, N-Kjeldahl=80 mg/l, N-NH4=70 mg/l, N-NOx<1 mg/l, P-PO4=5 mg/l. Legal requirements for treated wastewater were: COD=<100 mg/l, BOD5<5 mg/l, N-NH4=<1 mg/l, N-NOx=<10 mg/l.

Municipal wastewater treatment with pond–constructed wetland system: a case study

2005 ◽  
Vol 51 (12) ◽  
pp. 325-329 ◽  
Author(s):  
X. Wang ◽  
X. Bai ◽  
J. Qiu ◽  
B. Wang
Keyword(s):  
Constructed Wetland ◽  
Municipal Wastewater ◽  
Municipal Wastewater Treatment ◽  
Oxidation Pond ◽  
System A ◽  
Treated Effluent ◽  
Wetland System ◽  
Oxidation Ponds ◽  
Better Than

The performance of a pond–constructed wetland system in the treatment of municipal wastewater in Kiaochow city was studied; and comparison with oxidation ponds system was conducted. In the post-constructed wetland, the removal of COD, TN and TP is 24%, 58.5% and 24.8% respectively. The treated effluent from the constructed wetland can meet the Chinese National Agricultural and Irrigation Standard. The comparison between pond–constructed wetland system and oxidation pond system shows that total nitrogen removal in a constructed wetland is better than that in an oxidation pond and the TP removal is inferior. A possible reason is the low dissolved oxygen concentration in the wetland. Constructed wetlands can restrain the growth of algae effectively, and can produce obvious ecological and economical benefits.

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