scholarly journals The constructed wetlands engineering cases with different plants treating domestic sewage in a subtropical climate at cold seasons

2018 ◽  
Vol 30 (1) ◽  
pp. 130-138
Author(s):  
ZHOU Qingwei ◽  
◽  
LIANG Yinxiu ◽  
YAN Baixing ◽  
LIU Xingtu ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Domestic Sewage ◽  
Subtropical Climate

Removal of six phthalic acid esters (PAEs) from domestic sewage by constructed wetlands

2015 ◽  
Vol 275 ◽  
pp. 198-205 ◽  
Author(s):  
Tang Xiaoyan ◽  
Wang Suyu ◽  
Yang Yang ◽  
Tao Ran ◽  
Dai Yunv ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Phthalic Acid ◽  
Domestic Sewage ◽  
Phthalic Acid Esters ◽  
Acid Esters

scholarly journals Phytoremediation performance of Acorus calamus and Canna indica for the treatment of primary treated domestic sewage through vertical subsurface flow constructed wetlands: a field-scale study

2020 ◽  
Vol 15 (2) ◽  
pp. 528-539 ◽  
Author(s):  
Mahesh Prasad Barya ◽  
Deepak Gupta ◽  
Tarun Kumar Thakur ◽  
Reetika Shukla ◽  
Gurudatta Singh ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Total Nitrogen ◽  
Subsurface Flow ◽  
Domestic Sewage ◽  
Acorus Calamus ◽  
Canna Indica ◽  
Environmentally Sustainable ◽  
Treated Sewage ◽  
Subsurface Flow Constructed Wetlands ◽  
Flow Treatment

Abstract Under the present investigation, vertical subsurface flow constructed wetlands (VSSFCWs) planted with macrophytes treated domestic sewage in an environmentally sustainable manner. Treatment of domestic sewage with wetlands is an alternative method that decreases energy consumption and economic costs involved in the treatment of environmental contaminants. This study evaluates the potential efficiency of VSSFCWs using two different macrophytes, Acorus calamus and Canna indica for the treatment of domestic sewage. To perform this study, two chambers of VSSFCWs of dimensions 2.48 m × 1.24 m × 1.54 m were built. The wetland was fed with the primary treated sewage at a hydraulic loading rate (HLR) of 0.67 m3/h (hours) in a batch flow. Treatment of primary sewage was observed from day 1 to day 6; once a day (i.e. 24 h to 144 h). The treatment of sewage was found to be significant up to day 6 (144 h); beyond this time, no significant removal was observed. The results revealed that both the wetland setups performed significant removal of TDS, BOD5, total nitrogen, and phosphate. The wetland planted with Canna indica was a better performer for the removal of TDS (22.31%), BOD5 (81.79%), total nitrogen (60.37%), and phosphate (80%).

scholarly journals Performance of three pilot-scale hybrid constructed wetlands for total coliforms and Escherichia coli removal from primary effluent – a 2-year study in a subtropical climate

2014 ◽  
Vol 13 (2) ◽  
pp. 446-458 ◽  
Author(s):  
Florentina Zurita ◽  
Alejandra Carreón-Álvarez
Keyword(s):  
Escherichia Coli ◽  
Constructed Wetlands ◽  
Pilot Scale ◽  
World Health ◽  
First Year ◽  
Subtropical Climate ◽  
Total Coliforms ◽  
E Coli ◽  
Stage System ◽  
Health Organization

Three pilot-scale two-stage hybrid constructed wetlands were evaluated in order to compare their efficiency for total coliforms (TCol) and Escherichia coli removal and to analyze their performances in two 1-year periods of experimentation. System I consisted of a horizontal flow (HF) constructed wetland (CW) followed by a stabilization pond. System II was also configured with a HF CW as a first stage which was then followed by a vertical flow (VF) CW as a second stage. System III was configured with a VF CW followed by a HF CW. In the first year of evaluation, the HF–VF system was the most effective for TCol removal (p < 0.05) and achieved a reduction of 2.2 log units. With regard to E. coli removal, the HF–VF and VF–HF systems were the most effective (p < 0.05) with average reductions of 3.2 and 3.8 log units, respectively. In the second year, the most effective were those with a VF component for both TCol and E. coli which underwent average reductions of 2.34–2.44 and 3.44–3.74 log units, respectively. The reduction achieved in E. coli densities, in both years, satisfy the World Health Organization guidelines that require a 3–4 log unit pathogen reduction in wastewater treatment systems.

Succession in constructed wetlands under different hydroperiods in a subtropical climate

2000 ◽  
Vol 27 (3) ◽  
pp. 1645-1648
Author(s):  
S. G. T. Giovannini ◽  
B. Irgang ◽  
D. M. L. da Motta Marques
Keyword(s):  
Constructed Wetlands ◽  
Subtropical Climate

Water quality and occurrences of protozoa and metazoa in two constructed wetlands treating different wastewaters in Thailand

1997 ◽  
Vol 36 (12) ◽  
pp. 183-188 ◽  
Author(s):  
Thongchai Panswad ◽  
Orathai Chavalparit
Keyword(s):  
Water Quality ◽  
Constructed Wetlands ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Domestic Sewage ◽  
Industrial Estate ◽  
Tropical Conditions ◽  
Physical And Chemical ◽  
Chemical Water

Two constructed wetlands were evaluated regarding their performance in treating different wastewaters under the tropical conditions of Thailand. The first one was for treating the domestic sewage from a governmental institute, whereas the latter was used to improve the quality of the effluent from a central aerated lagoon, for which the influent had been already pretreated by about 100 factories in an industrial estate. The hydraulic loading rate and the hydraulic retention time were 0.015 m3/m2.d and 28 days and 0.3 m3/m2.d and 3 days for the two wetland systems, respectively. The physical and chemical water quality and the occurrences of protozoa and metazoa were monitored for three seasons, each of which had samples taken twice a week for two months. The temperature was quite constant throughout the whole year, ie., 26 to 31°C and 25 to 34°C for the two wetlands, respectively. The water quality of the wetland effluents was rather good; the BOD and TKN were only 4.5 and 3.3 mg/l and 2.7 and 6.8 mg/l for the two cases. A relationship between the filtered BOD and the zoological characteristics was established. As a result, a simple glance at the occurrence of certain metazoa and protozoa can rapidly but approximately predict the water quality of the system.

An assessment of mosquito breeding and control in four surface flow wetlands in tropical-subtropical Australia

2003 ◽  
Vol 48 (5) ◽  
pp. 249-256 ◽  
Author(s):  
M. Greenway ◽  
P. Dale ◽  
H. Chapman
Keyword(s):  
Constructed Wetlands ◽  
Open Water ◽  
Surface Flow ◽  
Mosquito Larvae ◽  
Subtropical Climate ◽  
Macroinvertebrate Communities ◽  
Breeding Sites ◽  
Climatic Regions ◽  
Invertebrate Biodiversity ◽  
And Control

In Queensland, Australia, the tropical-subtropical climate is ideal to promote macrophyte growth in surface flow wetlands; however, there have been concerns that constructed wetlands are potential breeding sites for disease-bearing mosquitoes. The aim of this study was to assess whether mosquitoes were breeding in these constructed wetlands, and if so, where they breed, and what parameters might influence breeding: e.g. water quality, vegetation, or macroinvertebrate communities. A study of four surface flow constructed wetlands located in different climatic regions was undertaken. Mosquito larvae were sampled using 240 ml dippers and macroinvertebrates using dip nets. The wetland with the greatest biodiversity of macrophytes and macroinvertebrates had the least number of mosquito larvae (< 1% of all dips). Samples with most mosquito larvae occurred amongst dense mats of Paspalum grass or dead Typha. Despite the presence of larvae in some parts of these wetlands very few late instars or pupae were found i.e. completion of the mosquito life cycle to adult mosquitoes was unsuccessful. This study has shown that the presence of mosquito larvae can be minimised by increasing macro-invertebrate biodiversity, by planting a variety of macrophyte types and species, excluding aggressive plant species, and maintaining at least 30% open water. Macroinvertebrates are probably a crucial factor in the control of mosquito larvae ensuring that predation of the early instars prevents or limits the development of pupae and the emergence of adults.

Optimization of four kinds of constructed wetlands substrate combination treating domestic sewage

2007 ◽  
Vol 12 (6) ◽  
pp. 1136-1142 ◽  
Author(s):  
Yongzheng Ren ◽  
Beiping Zhang ◽  
Zhen Liu ◽  
Jin Wang
Keyword(s):  
Constructed Wetlands ◽  
Domestic Sewage
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