Phosphorus removal and effect of adsorbent type in a constructed wetland system

Ayaz, Selma; Aktaş, Özgür; Findik, N.; Akça, Lütfi

doi:10.1080/19443994.2012.661267

Cited by 48 publications

(25 citation statements)

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“…Based on the Langmuir adsorption model, the predicted maximum monolayer phosphorous adsorption capacity of natural and modified clinoptilolite at 303 K was found to be 0.6508 mg·g -1 and 1.4941 mg·g -1 respectively. The adsorption capacity was much higher than the data reported by Selma C. Ayaz et al [33] The R L parameter was considered as a more reliable indicator for adsorption. R L values tabulated in Table 2 for phosphorus adsorption on natural and modified clinoptilolite were found to be positive and the results less than unity indicating the adsorption effect is remarkable.…”

Section: Adsorption Isothermcontrasting

confidence: 47%

Phosphorus Removal From Aqueous Solution By Adsorption Onto La-modified Clinoptilolite

Wang

Qiu

et al. 2016

MATEC Web Conf.

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Abstract.A La-modified clinoptilolite adsorbent was developed for phosphorus removal from aqueous solution. The effects of operational parameters such as pH, adsorbent dosage, contact time and temperature on phosphorus adsorption were investigated. The results showed that the phosphorus removal ratio of modified clinoptilolite (99.45%) was significantly improved, which was over triple than that of natural ones (31.50%) under optimum conditions. The adsorption process was well described by the pseudo-second-order kinetic model. Moreover, the adsorption data closely fitted the Freundlich isotherm model. The proper pH for phosphorus removal ranged from 5 to 8. The adsorption process was appeared to be controlled by chemical precipitation. The mechanism might involve ion complexation during subsequent adsorption of phosphorus on lanthanum hydroxides. It cost modified clinoptilolite less time to reach equilibrium. The application of modified clinoptilolite is available in wastewater treatment.

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Section: Adsorption Isothermcontrasting

confidence: 47%

Phosphorus Removal From Aqueous Solution By Adsorption Onto La-modified Clinoptilolite

Wang

Qiu

et al. 2016

MATEC Web Conf.

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“…It might probably be resulted from that adsorption, the principal mechanism for P retention at this stage, reduced sharply due to the sorption sites within the bed might nearly be exhausted as a result of the high P LR and inferior P adsorption capacity of the gravel. Indeed, adsorption process was reported to just take a low occupation in P removal by substrate [29], and declines of P removal performance after a short period of loading due to the exhausted P sorption capacity of bed media were also observed by other authors [21,29,30].…”

Section: P Removal Performance Of the Ivcwsmentioning

confidence: 83%

“…Nevertheless, the quantities of these minerals contained in gravel are usually low [20,21,30,32], resulting in a low and extensively varied removal rate of P. Besides, media size also plays an important role in P removal, with high sorption capacity for fine gravel due to larger surface areas [33]. However, clogging is apt to happen in media with fine size; thus, medium to large sized media was applied in this study, which was another reason for the low P removal rate.…”

Section: P Removal Performance Of the Ivcwsmentioning

confidence: 99%

“…Consequently, in this study we set up four pilotscale IVCW systems outdoors operating independently under identical design and hydraulic condition to deal with DW and SW in parallel, with common gravel employed as the substrate despite its inferior P binding capacity [14,20,21], since gravel is the most widely used media in large-scale CW projects due to its economical and easy availability, and relatively large porosity which can provide good hydraulic conductivity and reduce the probability of clogging. The aims of the study were (1) to investigate and compare the phosphorus removal capacities of IVCWs for the treatment of DW and SW under two LRs for about two years, and (2) to investigate the role of plant development on P removal.…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Chang

Zhang

et al. 2014

Desalination and Water Treatment

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A B S T R A C TFour small-scale gravel-based integrated vertical-flow constructed wetlands (IVCWs) were established to treat domestic and secondary wastewater (SW) in parallel under two loading rates (LRs) for an operational period of about two years and the total phosphorus (TP) removal performances were investigated and compared. Highly effective TP elimination sustained for about 10 d, with remarkable declines followed to relatively stable efficiencies for both types of wastewater. Significant difference of TP removal performance for the two types of wastewater was observed. In period 1, under high LR, the IVCWs performed better when treating domestic wastewater (DW), achieving average removal efficiency and rate of 51.6% and 0.389 g m, respectively, compared to those of 30.1% and 0.233 g mfor SW. However, in the operational period 2 fed with a low LR, better TP removal performance was achieved for SW, with reduction efficiency and rate of 41.5% and 0.057 g m −2 d −1 on average, while the corresponding value for the treatment of DW was just 12.5% and 0.023 g m. Significant correlations between TP removal efficiency and plant growth detected during this period and better developed vegetation in systems fed with SW might suggest the considerable role of plant growth, which could be influenced by inlet properties, on P retention and lifespan extending of constructed wetland. Gravel-based IVCW could be employed to remove low load of phosphorus and wastewater properties, and plant growth cycle should be taken into consideration in future IVCW design and application.

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“…In developing countries, approximately 75% of domestic wastewater is released to the environment without treatment (Kurniadie 2011, Westholm 2006. Ayaz et al (2012) reported that eutrophication in receiving water bodies may occur when phosphorus concentrations are N 6 mg/L. Therefore, proper treatment to remove phosphorus from domestic wastewater to achieve the admissible level for natural systems is needed.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus removal from secondary sewage and septage using sand media amended with biochar in constructed wetland mesocosms

Rozari

Greenway

Hanandeh

2016

Science of The Total Environment

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To improve the performance efficiency of subsurface constructed wetlands (CWs), a variety of media have been tested. Recently, there has been a rising interest in biochar. This research aims to develop the effectiveness of sand media amended with biochar and two plants species (Melaleuca quinquenervia and Cymbopogon citratus) in removing phosphorus from sewage effluent in CWs. The experimental design consisted of vertical flow (VF) mesocosms with seven media treatments based on the proportions of biochar in the sand media which ranged from 0 to 25% by volume. During the first 8months, the mesocosms were loaded with secondary clarified wastewater (SCW) then septage was used for the remaining 8months. Inflow and outflow were monitored for total phosphorus (TP) and PO4-P. Plants were harvested at the end of the experiment and TP biomass was determined. Removal efficiencies of TP in the mesocosms loaded with SCW and septage ranged from 42 to 91% and 30 to 83%, respectively. Removal efficiencies of PO4-P ranged from 43 to -92% and 35 to 85% for SCW and septage, respectively. The results revealed that the sand media performed better than the biochar-amended media; increasing the proportion of biochar in the media decreased removal efficiency of phosphorus. However, after flushing due to major rain event, there was no significant difference between sand and sand augmented with 20% biochar. Total plant P ranged from 1.75g in the 20% biochar mesocosm to 2.10g in the sand only mesocosm. Plant uptake of P, at least in part, may be accredited for the better P removal efficiency in the sand media compared to the biochar-amended media.

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Phosphorus removal and effect of adsorbent type in a constructed wetland system

Cited by 48 publications

References 0 publications

Phosphorus Removal From Aqueous Solution By Adsorption Onto La-modified Clinoptilolite

Phosphorus Removal From Aqueous Solution By Adsorption Onto La-modified Clinoptilolite

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Phosphorus removal from secondary sewage and septage using sand media amended with biochar in constructed wetland mesocosms

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