Impact of substrate type, depth and retention time on organic matter removal in vertical subsurface flow constructed wetland mesocosms for treating slaughterhouse wastewater

Mburu, C.; Kipkemboi, Julius; Kimwaga, Richard

doi:10.1016/j.pce.2019.07.005

Cited by 27 publications

(11 citation statements)

References 24 publications

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“…Removal of COD from slaughterhouse wastewater is quite variable with other treatment systems. According to Mburu et al wetlands can remove 55% of the influent COD when a five-day retention period was applied 33 . However, in another experiment applying slaughterhouse wastewater to wetland, COD removal of 74% was obtained after 10 days of retention 33 .…”

Section: Resultsmentioning

confidence: 99%

“…According to Mburu et al wetlands can remove 55% of the influent COD when a five-day retention period was applied 33 . However, in another experiment applying slaughterhouse wastewater to wetland, COD removal of 74% was obtained after 10 days of retention 33 . Similarly, at HRT of 1.16 day in a sequencing batch reactor (SBR), 60% of the COD was removed from the slaughterhouse wastewater 34 .…”

Section: Resultsmentioning

confidence: 99%

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Effects of feeding mode on the performance, life span and greenhouse gas emissions of a vertical flow macrophyte assisted vermifilter

Singh

Ray

Miller³

et al. 2022

npj Clean Water

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This study was conducted to investigate the impact of intermittent feeding on performance, clogging, and gaseous emission on macrophyte assisted vermifiltration (MAVF) based treatment system. Synthetic slaughterhouse wastewater was applied to two different integrated vertical flow based MAVFs. Triplicates were used throughout the study. Eisenia fetida earthworms were added to MAVFs, and Carex muskingmenis plants were planted. Wastewater was applied to the reactors on 1) intermittent (8 h/day) (IMAVF) and 2) continuous (24 h/day) (CMAVF) basis. The average chemical oxygen demand, total nitrogen, and total phosphorous removals achieved by the IMAVF were 80.2 ± 1.6%, 53.9 ± 1.3% and 66.5 ± 1% respectively, and 68.3 ± 1.3%, 61.2 ± 1.4%, and 60.5 ± 1.4% by the CMAVF, respectively. The diffusion of air to the bedding of IMAVFs during no-flow conditions facilitated higher organics oxidation, adsorption of phosphorous, nitrification, and ammonification. At the end of the study, hydraulic conductivity of IMAVF and CMAVF were found to be 0.036 cm/s and 0.037 cm/s, respectively. CO2, CH4 and N2O emissions from IMAVF were 245.5 ± 38.0 mg C/m2, 5.0 ± 4.6 mg C/m2 and 2513.5 ± 2629.9 μg N/m2 respectively, while CO2, CH4 and N2O emissions from CMAVF were 123.3 ± 14.5 mg C/m2, 74.8±45.2 mg C/m2 and 328.4 ± 93.4 μg N/m2, respectively. Intermittent application of influent could be considered for improving the performance and lifespan of MAVFs, causing lower environmental footprints.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of feeding mode on the performance, life span and greenhouse gas emissions of a vertical flow macrophyte assisted vermifilter

Singh

Ray

Miller³

et al. 2022

npj Clean Water

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“…The results showed minor variations in the removal efficiencies of BOD 5 and COD with varying depth and substrate type, but the removal efficiency of organic matter improved with the extended retention time. The overall organic matter removal efficiency was highest in 5‐day retention for BOD 5 (50%), COD (55%), TSS (82%), and the deeper mesocosms (0.8 m) showed a significant difference in removal of TSS and NH4‐N than 0.65 m depth mesocosms (Mburu, Kipkemboi, & Kimwaga, 2019). Also, the removal efficiency of NH 4 + ‐N increased with increase in substrate size at longer retention time.…”

Section: Wetland Design and Operationmentioning

confidence: 99%

Wetlands for environmental protection

Martinez‐Guerra

Ghimire

Nandimandalam

et al. 2020

Water Environment Research

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This article presents an update on the research and practical demonstration of wetland-based treatment technologies for protecting water resources and environment covering papers published in 2019. Wetland applications in wastewater treatment, stormwater management, and removal of nutrients, metals, and emerging pollutants including pathogens are highlighted. A summary of studies focusing on the effects of vegetation, wetland design and operation strategies, and process configurations and modeling, for efficient treatment of various municipal and industrial wastewaters, is included. In addition, hybrid and innovative processes with wetlands as a platform treatment technology are presented.

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“…To improve the performance of CWs, different procedures have been used, with the aim to optimize the HRT. For example, the removal rates of NH 4 + -N, NO 3 --N, and phosphate increase with increasing HRTs [8][9][10][11]. However, an excessively prolonged HRT results in a large occupied area and, in some cases, in system failure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydraulic Retention Time (HRT) and Packing Height on the Performance of Homemade Ceramsite-Soil Constructed Wetland for Rural Domestic Wastewater Treatment

Zhang¹,

Luo²,

Han³

et al. 2021

Pol. J. Environ. Stud.

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In this study, homemade ceramsite-soil filler (system A) and a simple soil filler (system B) were applied in vertical upflow constructed wetlands, and their performance in the treatment of rural domestic wastewater were investigated under various HRTs and packing heights. Optimum performance was reached at a HRT of 6.4 d in both systems. The average removal rates of ammonia nitrogen (NH 4 + -N), total nitrogen (TN), and total phosphorus (TP) in system A were as high as 90.78, 86.04, and 90.15%, respectively, which were 0.94, 2.21, and 10.62% higher than those in system B. The TN and NH 4 + -N removal efficiencies of both systems decreased with shorter HRTs, whereas the TP removal efficiency was almost not affected. Along the inlet direction, with increasing packing height, the pollutant removal capacity gradually decreased, and the NH 4 + -N removal efficiencies in the bottom layers (0-145 mm) of system A and B were 55.88 and 50.22%, respectively, with NH 4 + -N volumetric loads of 8.63 and 7.76 g/(m 3 •d). System A contained more nitrifying genera at the genus level, mainly including Stenotrophomonas, Sphingomonas, and Acinetobacter. The addition of ceramsite resulted in a higher treatment efficiency and resistance to hydraulic shock loading.

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Impact of substrate type, depth and retention time on organic matter removal in vertical subsurface flow constructed wetland mesocosms for treating slaughterhouse wastewater

Cited by 27 publications

References 24 publications

Effects of feeding mode on the performance, life span and greenhouse gas emissions of a vertical flow macrophyte assisted vermifilter

Effects of feeding mode on the performance, life span and greenhouse gas emissions of a vertical flow macrophyte assisted vermifilter

Wetlands for environmental protection

Effects of Hydraulic Retention Time (HRT) and Packing Height on the Performance of Homemade Ceramsite-Soil Constructed Wetland for Rural Domestic Wastewater Treatment

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