Impact of Hydraulic Loading Rate and Season on Water Contaminant Reductions Within Integrated Constructed Wetlands

Dong, Yu; Wiliński, Piotr; Dzakpasu, Mawuli; Scholz, Miklas

doi:10.1007/s13157-011-0176-5

Cited by 71 publications

(35 citation statements)

References 36 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Similar results are also reported by other authors [45,[50][51][52]. On the other hand, higher evapotranspiration rates in spring-summer period which will result in a lengthening of the retention times (on average 3.2 days), which ensures more time for phosphorus removal by both physical and chemical processes as biological processes [39,42].…”

Section: Phosphorous Removalsupporting

confidence: 89%

Effectiveness and Temporal Variation of a Full-Scale Horizontal Constructed Wetland in Reducing Nitrogen and Phosphorus from Domestic Wastewater

et al. 2018

View full text Add to dashboard Cite

Abstract:Cultural eutrophication stimulated by anthropogenic-derived nutrients represents one of most widespread water quality problems worldwide. Constructed wetlands (CWs) have emerged as an aesthetic, sustainable form of wastewater treatment, but, although they have shown adequate levels of organic matter removal in wastewaters, the effectiveness of nutrient removal has been less successful. An eleven-month monitoring program was undertaken in a horizontal subsurface flow CW (HSSF-CW) treating domestic wastewater from a village in Centre Region of Portugal, to evaluate the influence of climatic conditions (Continental-Mediterranean Climate region) and seasonal variations on removal. This CW uses gravel and sand as substrate and Phragmites australis as wetland plants. Samples were collected at the inlet and outlet from wetland bed and analyzed for pH, TN, Org-N, NH 4 + -N, NO x -N, TP and DP. The removal efficiencies (RE) of nitrogen and phosphorus compounds were relatively poor, but the results allow us to conclude that season had a significant (p < 0.05) effect on the RE of TN, NH 4 + -N, NO x -N, TP and DP, with higher values in warmest period (10.4%, 10.4%, 3.4%, 27.5% and 26.1%, respectively) than in coldest period (0%, −7.7%, −9.8%, 12.9% and 0%, respectively). Although lower hydraulic loading rate (HLR) generally resulted in better RE of all N and P compounds analyzed, no significant linear relationship was observed between these two variables. TN and NH 4 + -N concentrations in the effluent tend to significantly (p < 0.05) decrease with increasing respective incoming mass load rates for whole monitoring period and during spring-summer period, while the correlation between outlet TP concentrations and the inlet loading rate are not significant. The results indicate that the system is not effective for removal of nutrients, probably because it operated on overload and with a low hydraulic retention time (HRT) (average = 2.4 days). The results also showed that the RE of N and P followed seasonal trends, with higher values during spring-summer period.

show abstract

Section: Phosphorous Removalsupporting

confidence: 89%

Effectiveness and Temporal Variation of a Full-Scale Horizontal Constructed Wetland in Reducing Nitrogen and Phosphorus from Domestic Wastewater

et al. 2018

View full text Add to dashboard Cite

show abstract

“…During the whole experiment, the TP removal efficiency remained relatively steady, and mean TP removal efficiencies (68.01±17.45 %) was similar to the results of Chung et al (2008), Wu et al (2011) and Gikas and Tsihrintzis (2012), but lower than others (Xiong et al 2011;Dong et al 2011;Wang et al 2011).…”

Section: Evaluation Of Treatment Performance For Pollutantssupporting

confidence: 70%

Treatment performance and microorganism community structure of integrated vertical-flow constructed wetland plots for domestic wastewater

Chang

Dai

et al. 2012

Environ Sci Pollut Res

View full text Add to dashboard Cite

In order to investigate the treatment performance and microorganism mechanism of IVCW for domestic wastewater in central of China, two parallel pilot-scale IVCW systems were built to evaluate purification efficiencies, microbial community structure and enzyme activities. The results showed that mean removal efficiencies were 81.03 % for COD, 51.66 % for total nitrogen (TN), 42.50 % for NH 4 + -N, and 68.01 % for TP. Significant positive correlations between nitrate reductase activities and TN and NH 4 + -N removal efficiencies, along with a significant correlation between substrate enzyme activity and operation time, were observed. Redundancy analysis demonstrated gram-negative bacteria were mainly responsible for urease and phosphatase activities, and also played a major role in dehydrogenase and nitrate reductase activities. Meanwhile, anaerobic bacteria, gram-negative bacteria, and saturated FA groups, gram-positive bacteria exhibited good correlations with the removal of COD (p00.388), N (p0 0.236), and TP (p00.074), respectively. The IVCW system can be used to treat domestic wastewater effectively.

show abstract

“…This can be explained by the almost similar surface area of the wetlands, plant population, plant size, and climatic conditions under which they have been operated. In fact, a dense stand of wetland plants is given a reason for high evapotranspiration rates [43]. It should be recognized that the evapotranspiration rate between different plant species can vary greatly.…”

Section: Role Of Evapotranspiration and Evaporationmentioning

confidence: 99%

Effectiveness of Domestic Wastewater Treatment Using a Bio-Hedge Water Hyacinth Wetland System

Valipour

Raman

Ahn

2015

Water

View full text Add to dashboard Cite

Constructed wetland applications have been limited by a large land requirement and capital investment. This study aimed to improve a shallow pond water hyacinth system by incorporating the advantages of engineered attached microbial growth technique (termed Bio-hedge) for on-site domestic wastewater treatment. A laboratory scale continuous-flow system consists of the mesh type matrix providing an additional biofilm surface area of 54 m 2 /m 3 . Following one year of experimentation, the process showed more stability and enhanced performance in removing organic matter and nutrients, compared to traditional water hyacinth (by lowering 33%-67% HRT) and facultative (by lowering 92%-96% HRT) ponds. The wastewater exposed plants revealed a relative growth rate of 1.15% per day, and no anatomical deformities were observed. Plant nutrient level averaged 27 ± 1.7 and 44 ± 2.3 mg N/g dry weight, and 5 ± 1.4 & 9±1.2 mg P/g dry weight in roots and shoots, respectively. Microorganisms immobilized on Bio-hedge media (4.06 × 10 7 cfu/cm 2 ) and plant roots (3.12 × 10 4 cfu/cm) were isolated and identified (a total of 23 strains). The capital cost was pre-estimated for 1 m 3 /d wastewater at 78 US$/m 3 inflow and 465 US$/kg BOD5 removed. This process is a suitable ecotechnology due to improved biofilm formation, reduced footprint, energy savings, and increased quality effluent. OPEN ACCESSWater 2015, 7 330

show abstract

Impact of Hydraulic Loading Rate and Season on Water Contaminant Reductions Within Integrated Constructed Wetlands

Cited by 71 publications

References 36 publications

Effectiveness and Temporal Variation of a Full-Scale Horizontal Constructed Wetland in Reducing Nitrogen and Phosphorus from Domestic Wastewater

Effectiveness and Temporal Variation of a Full-Scale Horizontal Constructed Wetland in Reducing Nitrogen and Phosphorus from Domestic Wastewater

Treatment performance and microorganism community structure of integrated vertical-flow constructed wetland plots for domestic wastewater

Effectiveness of Domestic Wastewater Treatment Using a Bio-Hedge Water Hyacinth Wetland System

Contact Info

Product

Resources

About