An integrated model of substrate clogging in vertical flow constructed wetlands

Ge, Hua; Li, Ling; Zhao, Yaqian; Zhu, Wei; Shen, Jie

doi:10.1016/j.jenvman.2013.01.023

Cited by 51 publications

(36 citation statements)

References 26 publications

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“…Therefore, it was imperative to develop alternative technologies that are economical as well as eco-friendly. In recent years, aquatic macrophytes have been used worldwide for the removal of toxic pollutants, including heavy metals and pharmaceutical products from industrial effluent and municipal wastewater (Allende et al 2011;Augustynowicz et al 2010;Bonano 2012;Caselles-Osorio and Garcia 2007;Cui et al 2011;Ghemandi et al 2007;Hua et al 2013;Langergraba 2005;Maine et al 2009;Marchand et al 2010;Ong et al 2010;Ranieri et al 2011;Saeed and Sun 2012;Tang et al 2010;Vymazal 2005;Wen et al 2010;Wojciechowska and Waara 2011;Xue et al 2010;Zhang et al 2012). Main mechanisms of removal of heavy metals by aquatic plants are plant uptake, precipitation and co-precipitation as insoluble salts, and binding to the substrate (Brix 1994;Ranieri et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of Phragmites australis and Typha latifolia on biofiltration of heavy metals from secondary treated effluent

Kumari

Tripathi

2014

Int. J. Environ. Sci. Technol.

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The present work deals with a promising approach for the removal of heavy metals from secondary treated wastewater using aquatic plants, which are economic and effective in separating metals from polluted water. Since the conventional sewage treatment processes were inefficient to remove heavy metals from wastewater, batch experiments of Phragmites australis, Typha latifolia and P. australis and T. latifolia grown in association and reference (unplanted) were carried out for 15 days of retention time for the removal of copper (Cu), cadmium (Cd), chromium (Cr), nickel (Ni), iron (Fe), lead (Pb), and zinc (Zn) from the secondary treated effluent. Significantly, higher removal of the heavy metals in planted set than the reference revealed role of plants in their removal (analysis of variance, p \ 0.05). Higher removal of Cr, Fe, and Zn (66.2 ± 3.5, 70.6 ± 1.2, and 71.6 ± 3.9 %) in the combination of the P. australis and T. latifolia than their individual culture suggested synergistic effect of both the plants in the removal of these metals. Positive relationship was observed between retention time and the removal of heavy metals. Mass balance equation has revealed that the loss of heavy metals in wastewater was equivalent to the net accumulation of heavy metals in plant and loss of heavy metals in natural degradation. P. australis showed higher accumulative capacities for Cu, Cd, Cr, Ni, Fe, and Pb than those of T. latifolia. The P. australis and T. latifolia grown in association might be utilized for the heavy metal removal in the tropical environment.

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Section: Introductionmentioning

confidence: 99%

Effect of Phragmites australis and Typha latifolia on biofiltration of heavy metals from secondary treated effluent

Kumari

Tripathi

2014

Int. J. Environ. Sci. Technol.

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“…Studies have found that there is a significant relationship between the efficiency of constructed wetland sewage treatment systems and the wetland substrates (Hua et al, 2013;Xu et al, 2015). The more the microbial biomass in wetland, the better is the pollutant removal.…”

Section: Effects Of Different Substrates On Nh 3 En Concentrationmentioning

confidence: 99%

Impacts of different media on constructed wetlands for rural household sewage treatment

Zhang

Wang

et al. 2016

Journal of Cleaner Production

171

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a b s t r a c tConstructed wetland systems have been used for treating a variety of household and industrial wastewater; they are a wastewater treatment technology that has high economic efficiency and environmental effectiveness, especially for sewage treatment in rural areas. Medium filler plays an important role in wetland sewage treatment processes. By carrying out a problem analysis of the ineffective operation and treatment of traditional wetlands, this paper designs different constructed wetland fillers to treat rural household sewage. Using the same plants, this paper chooses four different fillers, namely maifanite, steel slag, bamboo charcoal and limestone as substrates to build constructed wetland systems, and studies rural household sewage treatment in order to examine their effects on the degradation of pollutants. The results show the removal efficiencies obtain good effect. The theoretical maximum adsorption capacities of all these media are ordered as: maifanite > steel slag > bamboo charcoal > limestone. The effluent water quality meets the first class A standard of the "Discharge standard of pollutants for municipal wastewater treatment plant" (GB18918-2002). The selection of medium has an important significance for the operating results of constructed wetland sewage treatment systems.

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“…This steady-state operation is however sometimes not possible due either to simple solids build up, or in part due to the nutrient loading which can drive the microbial community towards anabolic based processes (i.e., creation of biomass/biofilm) which can eventually lead to clogging of pore spaces (see Nivala et al [12]). Recent modelling exercises have included these dynamics into fundamental TW investigations [11,[13][14][15], and predict either heterogeneous or homogenous clogging depending on the specific model used.…”

Section: Introductionmentioning

confidence: 99%

Microbial Community Assessment in Wetlands for Water Pollution Control: Past, Present, and Future Outlook

Weber

2016

Water

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Abstract:The field of treatment wetlands (TWs) is rapidly expanding and, arguably, is tasked with studying and understanding one of the most complex water treatment systems available. Microbial communities are generally considered to be responsible for the majority of wastewater constituent degradation in TWs. However, they are also known to be spatially heterogeneous, temporally dynamic, as well as structurally and functionally diverse. Presented here is a meta-analysis of all peer reviewed TW journal articles which utilized a microbial community assessment methodology over the period of 1988 to July 2016. A total of 1101 papers were reviewed, 512 from 1988 to 2012, 215 of which included a microbial community assessment aspect and were subsequently classified as representing past research, and 589 from 2013 to July 2016, 196 of which were classified as representing current TW microbial community research. In general, TW microbial community research has increased over time, with a marked surge in the past four years. Microbial community structure is currently the most commonly used methodological type followed by activity, enumeration and function, respectively. Areas of research focus included nitrogen transformations (156), organic degradation (33), and emerging contaminants (32), with general characterization studies also accounting for a significant proportion (243). Microbial communities from a range of TW systems have been investigated over the last four years with meso-scale (10-1000 L) being the most commonly studied system size followed by large-scale (>100,000 L), micro-scale (<10 L), and pilot-scale (1000-100,000 L). Free water surface flow (SF), horizontal subsurface flow (HF), and vertical flow (VF) systems are being studied in approximately equal proportions with the majority of studies focused on gaining fixed media/biofilm samples for analysis (rather than from the rhizosphere or interstitial water). Looking at efforts from a regional perspective shows Asia to be publishing the majority of research with a main focus on VF systems and structural community assessment. European and North American studies are generally more evenly distributed among structure, function, activity, and enumeration with the majority of studies completed on HF systems. South America, Africa, and Oceania published fewer studies but focused on structural community assessment with a selection of HF, SF and VF investigations. Great strides are being made in the field of microbial community assessment in TWs with functional assessment methods being developed, better utilized, and being related directly to water treatment. The use of high-powered metagenomics sequencing such as Illumina HiSeq instrumentation is on the rise, as is the development and utilization of functional assays such as DNA microarrays and community level physiological profiling allowing for more complete community assessment. Used in concert with activity, enumeration and newly implemented stable isotope methodologies, the field of TWs is certainly moving a...

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An integrated model of substrate clogging in vertical flow constructed wetlands

Cited by 51 publications

References 26 publications

Effect of Phragmites australis and Typha latifolia on biofiltration of heavy metals from secondary treated effluent

Effect of Phragmites australis and Typha latifolia on biofiltration of heavy metals from secondary treated effluent

Impacts of different media on constructed wetlands for rural household sewage treatment

Microbial Community Assessment in Wetlands for Water Pollution Control: Past, Present, and Future Outlook

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