How to increase microbial degradation in constructed wetlands: Influencing factors and improvement measures

Meng, Panpan; Pei, Haiyan; Hu, Wenrong; Shao, Yuanyuan; Li, Zheng

doi:10.1016/j.biortech.2014.01.095

Cited by 230 publications

(123 citation statements)

References 70 publications

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“…When compared to conventional wastewater treatment systems, HSSF-CWs have shown to be a sustainable technology, which has been widely used to treat different types of wastewater and is simple to build and easy to operate and maintain [1,2]. They are also characterized by being low energy and chemical reagents demanding systems; consequently, they have become an alternative to conventional systems for the sanitation of small scale treatment plants.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…[11,27] With respect to comprehensive benefits, processes based on verticalflow wetlands presented higher ranks and had been implemented successfully worldwide. [28][29][30] In general, the longer the process was, the better was the treatment efficiency. This result was consistent with the finding by Mander et al [31] Vymazal [32] also proved that all types of hybrid wetlands were more efficient in TN removal than single horizontal-flow or vertical-flow wetlands.…”

Section: Upgrading Assessment Results and Discussion On Improving Watmentioning

confidence: 99%

Performance Evaluation of Constructed Wetlands Treating Wastewater Treatment Plant Effluent in Taihu Lake, China

Shen

Huang

Zhang

et al. 2017

CLEAN Soil Air Water

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Constructed wetlands are often used for advanced treatment of the secondary effluent of municipal wastewater treatment plants (WWTPs). Through assessing wetlands based on economic, technical, environmental, and social impacts, an optimal process is selected. In this study, a set of assessment methods for wetland treatment technology is established: The analytic hierarchy process (AHP) is used to establish the evaluation index system; the entropy weight method is employed to calculate the index weights; and the preference ranking organization method for enrichment evaluation (PROMETHEE) is utilized for ranking of the selected treatment technologies. Then four processes applied in Taihu Lake basin, China are evaluated. The results show the following ranking: Vertical-flow wetlandecological pond-surface-flow wetland-horizontal-flow wetland, vertical-flow wetland-horizontal-flow wetland, ecological pond-horizontal-flow wetlandsurface-flow wetland, and ecological ditch-ecological pond. The wetland exhibits certain universality and space portability with regard to treatment of municipal WWTP effluent. From the view of comprehensive benefits, the ranking of the treatment technology based on the vertical-flow wetland is high (Φ values between 0.0224 and 0.0349), whereas that based on the ecological pond is low (Φ values between À0.2086 and À0.2652), owing to the mechanism of the process itself and the role of microorganisms in the system. Moreover, for organic matter removal, a vertical-flow wetland process is recommended (48%), whereas for the removal of N contamination, an integrated-flow wetland process is suggested (31.2% for NH 3 -N, 32.4% for TN removals).

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“…But these methods are not of choice because of high cost and legislation constraints. Compared to conventional techniques, microbial technology seems to be more efficient, cost effective and eco-friendly for remediation of PAHs contaminated area (Li 2014). More reports are available on degradation of low molecular weight (LMW) PAHs compared to (HMW) PAHs.…”

Section: Methodsmentioning

confidence: 99%

“…Further by multi step reduction, 4-HCBA (m/z = 138.1) was formed which was reduced to OA,6-EO-3YIE (m/z = 57.9). The degradation pathway proceeded further, while 7-H-7,8,9,10-TM-7, 8-DCHDEN gave rise to transient metabolites, 1,1-DP-2-P (m/z = 167.2) and 4,6-D-T-BR (m/z = 73.1) in which carbon rings were reduced Meng (2014) reported that degradation of PAHs may be enhanced with appropriate concentration of the metabolites.…”

Section: Methodsmentioning

confidence: 99%

Biodegradation of perylene and benzo [ghi] perylene (5-6 rings) using yeast consortium : Kinetic study, enzyme analysis and degradation pathway

Mandal¹,

Das²

2018

JEB

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How to increase microbial degradation in constructed wetlands: Influencing factors and improvement measures

Cited by 230 publications

References 70 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

Performance Evaluation of Constructed Wetlands Treating Wastewater Treatment Plant Effluent in Taihu Lake, China

Biodegradation of perylene and benzo [ghi] perylene (5-6 rings) using yeast consortium : Kinetic study, enzyme analysis and degradation pathway

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