Performance comparison of constructed wetlands with gravel- and rice husk-based media for phenol and nitrogen removal

Tee, Heng-Chong; Seng, Chye‐Eng; Noor, Ahmad Md.; Lim, Poh‐Eng

doi:10.1016/j.scitotenv.2009.02.017

Cited by 77 publications

(28 citation statements)

References 24 publications

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“…In our batch treatments, the hydraulic retention time (HRT) was short (24-36 h) compared to common HRTs in efficient CW systems (several days). Therefore, it can be assumed that ammonia removal, if it occurred, did not affect phenol consumption rates, as was also shown in a previous study by Tee et al (2009). Nevertheless, in large CW systems nitrification may play a key role in dissolved oxygen consumption and therefore may reduce the degradation rate of phenols and other organics in the treated water.…”

Section: Figure 2 Percentage Of Phenol Residual As a Function Of Timesupporting

confidence: 55%

Performance comparison of plant root biofilm, gravel attached biofilm and planktonic microbial populations, in phenol removal within a constructed wetland wastewater treatment system

Kurzbaum

Kirzhner

Armon

2016

WSA

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This study was performed in order to understand the relative contribution of a constructed wetland (CW) system's various components to phenol degradation (100 mg•L -1 ) under controlled plant biomass/gravel/ water experimental ratios. This was done by division of a pilot-scale CW system into its components, with or without their associated bacteria: (i) gravel, plant and water; (ii) gravel and water; (iii) water; (iv) gravel; (v) plant; (vi) control (sterile water). The highest phenol biodegradation rate occurred for the gravel-attached biofilm followed by root-attached biofilm and planktonic population, which recorded a similar rate to each other and a much lower rate than the gravel-attached biofilm. A control containing CW planktonic inactivated bacteria (autoclaved water) did not impact phenol removal, revealing that microbial populations are the major factor in phenol removal. The differences in the phenol removal achieved could be attributed to higher numbers of specific phenol degraders on the gravel surface, compared to lower numbers of root-attached and planktonic bacterial fractions, as isolated using phenol-agar plates which contained phenol as the sole carbon source. The main contributor to our findings appears to be the larger surface area provided by the gravel bed compared to plant roots.

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Section: Figure 2 Percentage Of Phenol Residual As a Function Of Timesupporting

confidence: 55%

Performance comparison of plant root biofilm, gravel attached biofilm and planktonic microbial populations, in phenol removal within a constructed wetland wastewater treatment system

Kurzbaum

Kirzhner

Armon

2016

WSA

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“…In addition to sorption studies, some agricultural waste materials have already been tested and proved efficient as support matrix components of CWS [310][311][312][313].…”

Section: Industrial and Agricultural Wastes And By-productsmentioning

confidence: 99%

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Dordio

Carvalho

2013

Journal of Hazardous Materials

191

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“…Other studies had already pointed to better performances obtained with planted systems in comparison with unplanted ones and to the important role attributed to the micro-aerobic zones produced in the rhyzosphere (Yalcuk, 2011) as well as adsorption to the roots and phenol uptake by the plants (Tee et al, 2009;Graber et al, 2009). …”

Section: Parametersmentioning

confidence: 99%

Constructed wetlands with light expanded clay aggregates for agricultural wastewater treatment

Dordio

Carvalho

2013

Science of The Total Environment

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. H I G H L I G H T S• CW with LECA substrate and Phragmites plants tested with agricultural wastewaters.• High removals of TSS, COD, NH 4 -N, polyphenols, a pharmaceutical and a pesticide.• Contact time of wastewaters with beds ranged from 3 to 9days in batch conditions.• Promising results suggest more studies in full-scale and more realistic conditions. Constructed wetlands (CWs) are receiving a renewed attention as a viable phytotechnology for treating agricultural wastewaters and for the removal of more specific pollutants, in particular recalcitrant ones. In this work, the performance of CW mesocosms using light expanded clay aggregates (LECA) as the bed's substrate and planted with Phragmites australis was investigated for treatment of olive mill wastewater (OMW), swine wastewater (SW) contaminated with oxytetracycline and water contaminated with herbicide MCPA (2-methyl-4-chlorophenoxyacetic acid). Both wastewaters (OMW and SW) initially presented high organic matter content and total suspended solids which were removed by the system with efficiencies higher than 80%. Removal of polyphenols in OMW and nitrogen compounds in SW also showed similar or higher efficiencies in comparison with other treatment systems reported in the literature. The antibiotic oxytetracycline was completely removed from SW within the assay period in unplanted LECA beds, but planted beds allowed a significantly faster removal. In regard to water contaminated with MCPA, the results showed that LECA has a large sorption capacity for this herbicide (removal efficiencies of 56-97%). In general, considerably higher pollutant removal efficiencies were obtained when plants were used (up to 28% higher). The results obtained are indicative that CWs with LECA as substrate may be an adequate option for agricultural wastewater treatment. a b s t r a c t a r t i c l e i n f o

show abstract

Performance comparison of constructed wetlands with gravel- and rice husk-based media for phenol and nitrogen removal

Cited by 77 publications

References 24 publications

Performance comparison of plant root biofilm, gravel attached biofilm and planktonic microbial populations, in phenol removal within a constructed wetland wastewater treatment system

Performance comparison of plant root biofilm, gravel attached biofilm and planktonic microbial populations, in phenol removal within a constructed wetland wastewater treatment system

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Constructed wetlands with light expanded clay aggregates for agricultural wastewater treatment

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