Nutrient Removal from Polluted River Water by Using Vertical and Horizontal Subsurface Flow Constructed Wetlands

2011 ◽  
Vol 393-395 ◽  
pp. 1304-1307 ◽  
Author(s):  
En Shi ◽  
Zong Lian She ◽  
Tian Xie ◽  
Jian Wu ◽  
Xiao Hui Fu
Keyword(s):  
River Water ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Nutrient Removal ◽  
Subsurface Flow ◽  
Vertical Flow ◽  
Experiment Research ◽  
Nitrogen And Phosphorus ◽  
Polluted River ◽  
Subsurface Flow Constructed Wetland

The main purpose of this study was to treat organic pollutants, nitrogen and phosphorus in polluted river water by the use of constructed wetland (CW) systems. A laboratory experiment research was conducted on subsurface flow constructed wetland systems operated in vertical flow (VF) and horizontal flow (HF) mode. The systems were unplanted and hydraulic retention times were identically 2.7 days. The average removal efficiencies for HFCW and VFCW were NH+ 4-N 64.9% and 75.2%, NO- 3-N 92.3% and 40.1%, COD 97.5% and 90.1%, TP 94.6% and 96.2%, respectively. The removal of NH+ 4-N and NO- 3-N in the different CW units were in order of VFCW (drained) > VFCW (flooded) > HFCW and HFCW > VFCW (flooded) > VFCW (drained), respectively. When the water level in the VFCW was changed, an obvious fluctuation of the effluent NH+ 4-N and NO- 3-N concentrations was observed.

Landfill leachate treatment by an experimental subsurface flow constructed wetland in tropical climate countries

2005 ◽  
Vol 52 (12) ◽  
pp. 243-250 ◽  
Author(s):  
Z. Ujang ◽  
E. Soedjono ◽  
M.R. Salim ◽  
R.B. Shutes
Keyword(s):  
Heavy Metals ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Landfill Leachate ◽  
Subsurface Flow ◽  
Experimental Unit ◽  
Leachate Treatment ◽  
Emergent Plants ◽  
Subsurface Flow Constructed Wetland ◽  
Better Than

Municipal leachate was treated in an experimental unit of constructed wetlands of subsurface flow type. The parameters studied were organics (BOD and COD), solids and heavy metals (Zn, Ni, Cu, Cr and Pb). Using two types of emergent plants of Scirpus globulosus and Eriocaulon sexangulare, more than 80% removal was achieved for all the parameters. E. sexangulare removed organics and heavy metals better than Scirpus globulosus. A higher concentration of heavy metals in the influent did not change the removal efficiency.

The improvement of water quality indicators in constructed wetland treatment systems in Latvia

2020 ◽  
Author(s):  
Linda Grinberga ◽  
Ainis Lagzdins
Keyword(s):  
Water Quality ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Catchment Area ◽  
Suspended Solids ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Surface Flow ◽  
Subsurface Flow Constructed Wetland

<p>This study includes water quality monitoring data obtained since June, 2014 at the farm located in the middle part of Latvia. The water treatment system with two separate constructed wetlands was established to improve water quality in agricultural area. A surface flow constructed wetland received drainage runoff from the agricultural catchment basin. A subsurface flow constructed wetland was implemented to retain nutrients from the surface runoff collected in the area of impermeable pavements of the farmyard. As there are no other specific calculations recommended for the designing of constructed wetlands in Latvia, both wetlands were calculated basing on the surface area of the constructed wetland/catchment area ratio. The surface area of the subsurface flow constructed wetland was deigned by 1.2% of the catchment area and the ratio was 0.5 % for the surface flow constructed wetland.</p><p>Water samples were collected manually by grab sampling method once or twice per month basing on a flowrate. Water quality parameters such as total suspended solids (TSS), nitrate-nitrogen (NO3-N), ammonium-nitrogen (NH4-N), total nitrogen (TN), orthophosphate-phosphorus (PO4-P), and total phosphorus (TP), biochemical oxygen demand (BOD) and chemical oxygen demand (COD) were analysed to monitor the performance of both wetlands. The concentrations at the inlet and outlet were compared to evaluate the efficiency of the water treatment.</p><p>The concentrations of NO3-N, NH4-N and TN were reduced on average by 21 %, 35 % and 20 %, respectively for the surface flow constructed wetland. PO4-P and TP concentrations were reduced on average by 31 % and 45 %, respectively for the surface flow constructed wetland. Total suspended solids were reduced by 17% at the outlet of the surface flow constructed wetland. However, in some cases, an increase in nutrient concentrations in water leaving the wetland was observed. The study showed the constant reduction of the PO4-P and TP concentrations 82 % and 83 %, respectively in the subsurface flow constructed wetland. The concentrations of NO3-N, NH4-N and TN were reduced on average by 14 %, 66 % and 53 %, respectively for the subsurface flow constructed wetland. BOD and COD reduction on average by 93 % and 83 %, respectively in for the subsurface flow constructed wetland indicated the ability of the treatment system to be adapted for wastewater treatment with high content of organic matter under the given climate conditions. This study outlined that the farmyards should receive a special attention regarding surface runoff management.</p>

scholarly journals Partition and Fate of Phthalate Acid Esters (PAEs) in a Full-Scale Horizontal Subsurface Flow Constructed Wetland Treating Polluted River Water

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 865 ◽  
Author(s):  
Lei Zheng ◽  
Tingting Liu ◽  
En Xie ◽  
Mingxue Liu ◽  
Aizhong Ding ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Human Life ◽  
Subsurface Flow ◽  
Full Scale ◽  
Subsurface Flow Constructed Wetland ◽  
Horizontal Subsurface Flow ◽  
Butyl Phthalate ◽  
Acid Esters ◽  
Phthalate Acid Esters

When used as highly produced chemicals and widely used plasticizers, Phthalate acid esters (PAEs) have potential risks to human life and the environment. In this study, to assess the distribution and fate of PAEs, specifically inside a full-scale horizontal subsurface flow constructed wetland, four PAEs including dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), and bis (2-ethylhexyl) phthalate (DEHP) were investigated. In effluent, PAEs concentration decreased 19.32% (DMP), 19.18% (DEP), 19.40% (DBP), and 48.56% (DEHP), respectively. Within the wetland, PAEs partitioned in water (0.18–1.12 μg/L, 35.38–64.92%), soil (0.44–5.08 μg/g, 1.02–31.33%), plant (0.68–48.6 μg/g, 0.85–36.54%), air and biological transformation (2.72–33.21%). The results indicated that soil and plant adsorption contributed to the majority of PAE removal, digesting DMP (19.32%), DEP (19.18%), DBP (19.40%), and DEHP (48.56%) in constructed wetlands. Moreover, the adsorption was affected by both octanol/water partition coefficient (Kow) and transpiration stream concentration factors (TSCF). This work, for the first time, revealed the partition and fate of PAEs in constructed wetlands to the best of our knowledge.

scholarly journals UJI EFEKTIVITAS BATU VULKANIK DAN ARANG SEBAGAI MEDIA FILTER PENGOLAHAN AIR LIMBAH LAUNDRY DENGAN MENGGUNAKAN SISTEM PENGOLAHAN CONSTRUCTED WETLAND

2020 ◽  
Vol 5 (1) ◽  
pp. 67
Author(s):  
Made Pasek Arya Suwahdendi ◽  
I Gede Herry Purnama
Keyword(s):  
Constructed Wetland ◽  
Subsurface Flow ◽  
Vertical Flow ◽  
Cymbopogon Citratus ◽  
Subsurface Flow Constructed Wetland

ABSTRAKUsaha laundry saat ini tumbuh dengan pesat sehingga berpotensi untuk mencemari lingkungan karena air limbah yang dihasilkan seringkali dibuang ke badan air tanpa diolah terlebih dahulu. Salah satu pengolahan limbah yang dapat digunakan pada usaha laundry khususnya yang ada di Bali adalah sistem pengolahan air limbah model constructed wetland. Pada penelitian ini diketahui efektivitas model pengolahan air limbah Vertical Flow Subsurface Flow Constructed Wetland yang menggunakan media filter batu vulkanik kintamani dan arang kayu, serta menggunakan tanaman serai (Cymbopogon citratus) dalam mengolah air limbah laundry yang diukur berdasarkan parameter Total Fosfat dan Amonia. Hasil penelitian menunjukkan efektivitas sistem penurunan Total Fosfat dan Amonia selama 5 minggu pada masing-masing reaktor, yaitu; reaktor 1 (50% batu vulkanik, 50% arang) sebesar 26,69%, reaktor 2 (75% batu vulkanik, 25% arang) sebesar 37,32%, reaktor 3 (25% batu vulkanik, 75% arang) sebesar 20,94%, reaktor 4 (100% batu vulkanik) sebesar 26,91%, reaktor 5 (100% arang) sebesar 55,17%. Berdasarkan hasil penelitian, reaktor sistem constructed wetland yang digunakan dalam penelitian ini belum efektif dalam mengolah air limbah laundry, apabila diterapkan pada laundry lainnya akan menghasilkan kinerja yang lebih rendah karena nilai parameter air limbah pada laundry lainnya dapat lebih tinggi secara signifikan dibandingkan dengan laundry dalam penelitian ini.Kata kunci : Constructed Wetland, Batu Vulkanik, Arang, Total Fosfat, Amonia

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