Effects of annual harvesting on plants growth and nutrients removal in surface-flow constructed wetlands in northwestern China

Zheng, Yucong; Wang, Xiaochang C.; Ge, Yuan; Dzakpasu, Mawuli; Zhao, Yaqian; Xiong, Jiaqing

doi:10.1016/j.ecoleng.2015.06.035

Cited by 71 publications

(19 citation statements)

References 35 publications

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“…The harvesting of macrophyte biomass suitably during peak growth phase is perfect to avoid nutrient and metal remobilization from belowground vegetative parts or during senescence leaching on ultimate OM mineralization [112]. Similarly, a mono annual harvesting practice improves height; shoot density and biomass of macrophytes, although leading to nominal increment for mass TN and TP removal rates [113]. The ANOVA comparing the species shows uptake preference mode for Cu, K, Na, Se and Si indicating specific role in the unlike macrophytes [114].…”

Section: Resultsmentioning

confidence: 99%

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

Bhat¹,

Khan²

2019

ESD

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Monitoring at 30 sampling sites of Dal Lake is carried out to assess its spatial-temporal heterogeneity under human pressures. P surpass critical eutrophic index ( 0.05 mgL ≤ -1 ) while nitrate-N persist beneath it ( 0.5 mgL ≤ -1 ). Semi-drainage hydrology recuperates basin volume. Autotrophic assimilation and biocalcification episodes drop conductivity. Anionic prevalence of HCO3and Clexist along Ca > Mg > Na > K cationic progression. Autochthonous sediment OM at typical < 10 C/N is the conventional nutrient source. Higher temperature and lower N:P ratio during summer develop P internal loading process. Cr, Ni and Zn exceed the sediment quality guidelines. OM enriched sediments and calcite co-precipitation curtails PTE mobility. Biomass parameters establish similar variations except species turn-over. OM immobilizes nutrients and OC provisions denitrification. Dal Lake exposed to anthro-urban intensification depends on comprehensive management interventions like National Plan for Conservation of Aquatic Ecosystems vital for insitu leniency control and lake-front improvement.

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Section: Resultsmentioning

confidence: 99%

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

Bhat¹,

Khan²

2019

ESD

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“…Nutrient removal rate increased by 9% only for nitrogen and 17% for phosphorus in a HSSFCW planted with Typha latifolia compared to the control CW without plants (Costa et al, 2015). In addition, Zheng et al (2015) found harvesting had minimal increase in nutrient reduction (only 5.4% increase in TN and 9% in TP removal) by comparing harvested and unharvested constructed wetlands.…”

Section: Wetlands For Nutrient Removalmentioning

confidence: 96%

“…Result from duckweed-based CWs showed 22.4 g N/m 2 •yr removal and 7.4 g P/m 2 •yr removal by harvest (Adhikari et al, 2015). One study showed that increasing plant biomass will improve the redox conditions in the substrate layer and increase dissolved N and P removal by harvesting plant (Dzakpasu et al, 2015). Another study showed the proportional relationship between increased plant biomass and high P removal, and it suggested harvesting above-ground vegetation in June or September for maximum P removal in Floating treatment wetlands (Wang, Sample et al, 2015).…”

Section: Wetlands For Nutrient Removalmentioning

confidence: 99%

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Wetlands for Wastewater Treatment

Martinez‐Guerra

Gude

et al. 2016

Water Environment Research

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An update on the current research and development of the treatment technologies, which utilize natural processes or passive components in wastewater treatment, is provided in this paper. The main focus is on wetland systems and their applications in wastewater treatment (as an advanced treatment unit or decentralized system), nutrient and pollutant removal (metals, industrial and emerging pollutants including pharmaceutical compounds). A summary of studies involving the effects of vegetation, wetland design and modeling, hybrid and innovative systems, storm water treatment and pathogen removal is also included.

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“…Differences in the behavior of evaluated systems may be associated with the hydraulic holding time (HHT), organic load or applied nutrient load (notably nitrogen and phosphorus), characteristics of system (flow direction), and the cutoff frequency of plant shoot Zheng et al, 2015). As plants have limited nutrient absorption capacities, higher efficiencies can be obtained by applying lower loads than their removal capacity and thus a larger surface area should be available in HSSF-CWs.…”

Section: Introductionmentioning

confidence: 99%

Extraction Capacity of Grasses Grown in Constructed Wetland Systems Using Different Arrangements and Substrates

Saraiva

Matos

2019

Eng. Agríc.

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Constructed wetland systems have been used to treat different wastewater; among their essential components are the cultivated plant species and type of substrate used to fill them. The choice of plant species and type of substrate are important for the good system performance in wastewater treatment. This study aimed to evaluate the extraction capacity of Napier and Tifton 85 grasses when cultivated at different positions in horizontal subsurface flow constructed wetlands (HSSF-CWs) filled with different substrates in wastewater treatment from a bulk milk-cooling tank (MTWW). The experimental unit consisted of four HSSF-CWs, in which an average surface organic loading rate of 318 kg ha −1 d −1 of BOD5,20 was imposed and a hydraulic holding time of 1.8 and 3.0 d, respectively, in units filled with gravel or crushed PET bottles. Tifton 85 grass presented the highest Na extraction capacity, with better results obtained in HSSF-CWs filled with crushed PET bottles, while Napier grass was more effective in extracting N, K, and P from MTWW. When cultivated in the second half of gravel-filled HSSF-CWs, both grasses provided higher average N extractions when compared to those filled with crushed PET bottles, which had higher extractions in the first half of HSSF-CWs.

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Effects of annual harvesting on plants growth and nutrients removal in surface-flow constructed wetlands in northwestern China

Cited by 71 publications

References 35 publications

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

A Retrospective Environmental Assessment of the Natural Heritage of Dal Lake for Prospective Implication Scenarios

Wetlands for Wastewater Treatment

Extraction Capacity of Grasses Grown in Constructed Wetland Systems Using Different Arrangements and Substrates

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