scholarly journals The effects of flow regime and temperature on the wastewater purification efficiency of a pilot hybrid constructed wetland

2007 ◽  
Author(s):  
I. Zaytsev ◽  
K. Nurk ◽  
E. Põldvere ◽  
A. Noorvee ◽  
Ü. Mander
Keyword(s):  
Flow Regime ◽  
Constructed Wetland ◽  
Wastewater Purification ◽  
Purification Efficiency

Roles of substrate microorganisms and urease activities in wastewater purification in a constructed wetland system

2003 ◽  
Vol 21 (2-3) ◽  
pp. 191-195 ◽  
Author(s):  
Wei Liang ◽  
Zhen-bin Wu ◽  
Shui-ping Cheng ◽  
Qiao-hong Zhou ◽  
Hong-ying Hu
Keyword(s):  
Constructed Wetland ◽  
Wastewater Purification ◽  
Wetland System

The effect of a vertical flow filter bed on a hybrid constructed wetland system

2005 ◽  
Vol 51 (9) ◽  
pp. 137-144 ◽  
Author(s):  
A. Noorvee ◽  
E. Põldvere ◽  
Ü. Mander
Keyword(s):  
Constructed Wetland ◽  
Flow System ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Vertical Flow ◽  
Efficient Removal ◽  
Loading Rates ◽  
Purification Efficiency ◽  
Wetland System ◽  
Filter Bed

Data from 18 sampling wells in Kodijärve horizontal subsurface flow (HSSF) constructed wetland (CW) (South Estonia) is presented and differences in purification efficiencies inside the HSSF CW are calculated. Temporarily anaerobic conditions in the Kodijärve HSSF system did not allow efficient removal of BOD7, NH4-N, Ntot and Ptot. In 2002 a vertical subsurface flow filter was constructed to enhance aeration. The design of the system was based simply on the oxygen demand of the wastewater and on the aeration potential of vertical flow wetlands. The vertical flow system has shown satisfactory results. The purification efficiency of BOD7 in the Kodijärve CW has improved significantly and there has been a slight increase in purification efficiencies of NH4-N and Ntot. On the ohther hand, the removal efficiency of Ptot has decreased significantly. Although, the mass loading rates have increased, mass removal rates of all four parameters have improved significantly. Nevertheless, optimization of the constructed wetland system is essential in order to meet effluent standards during wintertime.

Comparative study of wastewater purification efficiencies of two emergent helophytes: Typha latifolia and juncus subulatus under arid climate

1999 ◽  
Vol 39 (10-11) ◽  
pp. 123-126 ◽  
Author(s):  
M. Abissy ◽  
L. Mandi
Keyword(s):  
Aquatic Plant ◽  
Typha Latifolia ◽  
Experimental Period ◽  
Arid Climate ◽  
Organic Load ◽  
Wastewater Purification ◽  
Purification Efficiency ◽  
Water Percolation ◽  
Removal Efficiencies ◽  
Raw Wastewater

The aim of the present study is to assess wastewater purification efficiency of two higher aquatic plant, Typha latifolia and Juncus subulatus in an arid climate. The experiment was conducted from August 1994 to March 1996. The plots (capacity: 115 liters, diameter: 57 cm) were filled to 5 cm depth with gravel and 30 cm with soil (texture: 30% clay, 34% silt and 36% sand) and planted with young shoots of Typha and Juncus. The plots without plant were used as controls. The plots were weekly and exclusively irrigated by urban raw wastewater (25 liters). The influent was percolating through the substratum. Results revealed significant performances for reduction of organic load in all systems. Indeed, COD and TSS removal efficiencies were respectively 91% and 73% for Typha latifolia, 92% and 76% for Juncus subulatus, 83% and 73% for an unplanted system. Depletion of nutrients during the experimental period was low and even negative: 32% TP (total phosphorus) and 31% NH4 (ammoniacal nitrogen) in Typha system, 27% TP and 17% NH4 in Juncus system, −10% TP and −22% NH4 in unplanted system. In addition, the presence of these helophytes maintained sufficient porosity in order to allow water percolation treatment. The unplanted system clogged in winter.

scholarly journals Integrating MFT-qPCR techniques in constructed wetland faecal bacterial purification monitoring; a case of a typical tropical hybrid constructed wetland system

2018 ◽  
Vol 78 (9) ◽  
pp. 2008-2018 ◽  
Author(s):  
Donde Oscar Omondi ◽  
Muia Anastasia Wairimu ◽  
Makindi Stanley Maingi ◽  
Onyango Godfrey Otieno ◽  
Kibet Caroline Jepkorir ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Membrane Filtration ◽  
Pathogenic Bacteria ◽  
Quantitative Polymerase Chain Reaction ◽  
Health Concern ◽  
Human Pathogens ◽  
Purification Efficiency ◽  
Wetland System

Abstract The sanitation control of pathogens in the tropical effluents needs much more attention to ensure ecosystem health integrity and the safety of human health. The common use of chemicals in achieving this in wastewater treatment has remained unsustainable due to much health concern. Indeed, based on the numerous challenges associated with faecal pathogenic bacteria in wastewaters, the focus is now on achieving higher purification efficiencies in the elimination of the human pathogens from wastewater through eco-sustainable systems such as constructed wetlands (CWs). Hence, the need to explore the application of constructed wetlands in wastewater treatment under specific local environmental conditions for accurate understanding and improved treatment efficiency. This study therefore aimed at monitoring constructed wetlands faecal bacteria purification efficiency through integrated non-molecular membrane filtration technique and molecular quantitative polymerase chain reaction (MFT-qPCR) technique. The results showed some shortfall in the treatment system and also proved that integrating MFT-qPCR in faecal bacterial purification monitoring within a constructed wetland system provides a more accurate and reliable outcome. Additionally, the wetland purification efficiency was low (<80%) with the dissolved oxygen posing the strongest influence on faecal pathogenic bacterial purification trend across the wetland. Hence, the need to regularly carry out dredging and macrophyte harvesting as well as the use of holistic and more integrative approaches such as MFT-qPCR in managing and monitoring the performance of CWs in faecal pathogen eradication for improved CWs purification efficiency.

scholarly journals Comparative Evaluation of Wastewater Purification Performance among Ten Different Macrophytes in the Constructed Wetland

2010 ◽  
Vol 46 (1) ◽  
pp. 59-69
Author(s):  
TOMOKO YAMAMOTO ◽  
PING GUI ◽  
TOSHIFUMI OSAKA ◽  
YOSHITAKA EBIE ◽  
KAIQIN XU ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Comparative Evaluation ◽  
Wastewater Purification

With River Sand and Soil Matrix Ophiopogon japonicus Artificial Wetland Research on Treatment of Wastewater Containing Lead

2014 ◽  
Vol 692 ◽  
pp. 60-64
Author(s):  
You Ming Cao ◽  
Yun Cheng Xie ◽  
Yan Hong Guo ◽  
Hong Jiang
Keyword(s):  
Removal Rate ◽  
Experimental Results ◽  
Wastewater Discharge ◽  
Wastewater Purification ◽  
Artificial Wetland ◽  
River Sand ◽  
Soil Matrix ◽  
Purification Efficiency ◽  
Ophiopogon Japonicus ◽  
Wetland System

Using plants Ophiopogon japonicus, with river sand and soil matrix to construct artificial wetland system, analyzes the effect of the purification of wastewater containing lead, and to study the influences of different flow on the purification efficiency. Experimental results show that the Ophiopogon japonicus artificial wetland to lead the lead in wastewater purification effect is good, with 2 L/d of wastewater flow trendy, Ophiopogon japonicus removal rate as high as 95.8%, of artificial wetland to lead bubbled into 16 L/d for wastewater discharge, removal rate can reach 85.3%.

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