Assessment of the nutrient removal performance in integrated constructed wetlands with the self-organizing map

Zhang, Liang; Scholz, Miklas; Mustafa, Atif; Harrington, Rory

doi:10.1016/j.watres.2008.04.027

Cited by 49 publications

(23 citation statements)

References 23 publications

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“…The procedure for placing a vector onto the map is to find the node with the closest weight vector to the data space vector. SOM has been applied to visualize simulation results to identify the relationship between input parameters383940. The component plane shows the value of the variable in each map unit.…”

Section: Methodsmentioning

confidence: 99%

What drives the aerosol distribution in Guangdong - the most developed province in Southern China?

Liu

Wang

2014

Sci Rep

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This paper uses Moderate Resolution Imaging Spectroradiometer (MODIS) data to investigate the spatial and temporal variations of aerosol optical thickness (AOT) over Guangdong, the most developed province in China, during 2010–2012. Linear regression and self-organizing maps (SOM) are used to investigate the relationship between AOT and its affecting factors, including Normalized Difference Vegetation Index (NDVI), elevation, urbanized land fraction, and several socio-economic variables. Results show that the highest values of τ0.55 mainly occur over the rapidly-developing Pearl River Delta (PRD) region and the eastern coast. Seasonal averaged AOT is highest in summer (0.416), followed by spring (0.351), winter (0.292), and autumn (0.254). From unary linear regression and SOM analysis, AOT is shown to be strongly negatively correlated to NDVI (R2 = 0.782) and elevation (R2 = 0.731), and positively correlated with socio-economic factors, especially GDP, industry and vehicle density (R2 above 0.73), but not primary industry. Multiple linear regression between AOT and the contributing factors shows much higher R2 values (>0.8), indicative of the clear relationships between AOT and variables. This study illustrates that human activities have strong impacts on aerosols distribution in Guangdong Province. Economic and industrial developments, as well as vehicle density, are the main controlling factors on aerosol distribution.

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Section: Methodsmentioning

confidence: 99%

What drives the aerosol distribution in Guangdong - the most developed province in Southern China?

Liu

Wang

2014

Sci Rep

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“…The phosphate-accumulating micro-organisms are sensitive to high salinity (Scholz 2006). Zhang et al (2008) evaluated the nutrient removal performance of constructed wetlands using self-organisation map models, and reported that chloride and conductivity correlated well with MRP, indicating that increased salt concentrations had negative effects on MRP removal. The mean effluent chloride concentrations at all sampling points were higher than those of the corresponding influent concentrations.…”

Section: Comparison Of Water Treatment Performancesmentioning

confidence: 99%

Nutrient release from integrated constructed wetlands sediment receiving farmyard run‐off and domestic wastewater

Dong

Kayranlı

Scholz

et al. 2012

Water & Environment J

Self Cite

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Constructed wetland sediments are frequently contaminated with nitrogen and phosphorus. There is a risk that accumulated pollutants can either be remobilised or reach the groundwater. Five identical mesocosms, which were filled with subsoil collected from full‐scale integrated constructed wetland (the first cell receives the most contaminated influent), were set up to examine nutrient removal within sediment layers. The results indicated that accumulated nutrients leached out into inflow water and that the sediment capacity of nutrient retention decreased as the wetlands aged. Furthermore, the mesocosm planted with Phragmites australis achieved better treatment results compared with the one planted with Agrostis stolonifera. The risk of contamination to groundwater does not exist because none of the treated water reached the bottom outlet during the study period. Both the bentonite (clay) and biogeochemical processes taking place within sediments proved to be efficient in preventing polluted water from infiltrating into lower lying soils.

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“…There is a growing need for constructed wetlands, especially in developing countries (Zhang et al 2009), to treat agricultural runoff (Zhang et al 2008), aquaculture wastewater (Lin et al 2002;Schulz et al 2003), municipal wastewater (USEPA 2000;Kao et al 2001;Meier et al 2005;Scholz 2006), mine drainage (Ye et al 2001;Collins et al 2005), and industrial wastewater (Simi and Mitchell 1999;Yang and Hu 2005;Chen et al 2006). Free Water Surface (FWS) systems (Zhang et al 2009) are cost effective at removing contaminants, and provide environmental value by offering ecological habitat for wetland biota (Li and Jiang 1995).…”

Section: Introductionmentioning

confidence: 99%

Associations Between Water Quality Parameters and Planktonic Communities in Three Constructed Wetlands, Taipei

Chen¹,

Lee

et al. 2011

Wetlands

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We used non-metric multidimensional-scaling analysis (NMDS) to analyze the variation and associations of abiotic and biotic variables among and within three constructed wetlands in metropolitan Taipei. Abiotic variables included NH 4 -N, biochemical oxygen demand, total phosphorus, suspended solids, dissolved oxygen, water temperature, pH, and electrical conductivity and were sampled monthly from April to October 2007. Biotic variables included zooplankton and phytoplankton communities and were sampled in May and August 2007. We sampled front-compartment, mid-compartment, and effluent portions of each wetland. BOD, NH 4 -N, TP, DO, SS, and pH differed significantly (p<0.05) among the three wetlands. Phytoplankton communities in each wetland were unique. Zooplankton differed between the two wetlands (Hsin-Hai Bridge I and Fu-Zhou Bridge). Overall, the three wetlands supported unique abiotic and biotic communities. Zooplankton and phytoplankton communities were correlated to TP, NH 4 -N, DO, and pH levels.

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Assessment of the nutrient removal performance in integrated constructed wetlands with the self-organizing map

Cited by 49 publications

References 23 publications

What drives the aerosol distribution in Guangdong - the most developed province in Southern China?

What drives the aerosol distribution in Guangdong - the most developed province in Southern China?

Nutrient release from integrated constructed wetlands sediment receiving farmyard run‐off and domestic wastewater

Associations Between Water Quality Parameters and Planktonic Communities in Three Constructed Wetlands, Taipei

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