Phosphorus sorption and chemical characteristics of lightweight aggregates (LWA)-potential filter media in treatment wetlands

Zhu, T.; Jenssen, Petter D.; Mæhlum, T.; Krogstad, T.

doi:10.2166/wst.1997.0175

Cited by 83 publications

(70 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, it is also known that LECA is a product made from clay and its properties depend on the raw material. The highest P removal ability is described for LECA from Norway [43]. Table 6.…”

Section: P-retention Capacity Of Aggregatesmentioning

confidence: 99%

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Karczmarczyk

Baryła

Bus

2014

Water

View full text Add to dashboard Cite

Abstract:The main hypothesis of the presented study is that the negative effect of phosphorus leaching from a green roof substrate can be reduced by including P-reactive material in a drainage layer. In this work, different aggregates (Pollytag ® , lightweight expanded clay aggregates, chalcedony, serpentynite and crushed autoclaved aerated concrete) to be used as the green roof drainage layer are described. Physical parameters, e.g., granulometric composition, water absorption, bulk density and porosity are assessed. A phosphorus sorption isotherm and a kinetic test were performed. Physical and chemical characteristics of the materials were used as a base for choosing the best media for the drainage layer. The P-removal efficiency of crushed autoclaved aerated concrete was confirmed in a column experiment. Adding the implementation of the P-reactive material in a drainage layer during construction can reduce the negative effect of substrate on green roof runoff quality.

show abstract

Section: P-retention Capacity Of Aggregatesmentioning

confidence: 99%

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Karczmarczyk

Baryła

Bus

2014

Water

View full text Add to dashboard Cite

show abstract

“…Natural materials as well as various artificial media were tested in order to improve phosphorus removal in CWS, e.g. factory made light-weight expanded clay aggregates (LECA) [79,[126][127][128], shale [128,129], crushed marble [79,130], diatomaceous earth, vermiculite and calcite [79], zeolites and limestone [128,131], furnace slag [132] and fly ash [132]. The vast variety of materials that have been studied for P-removal in CWS has already been the subject of several review works [133][134][135][136].…”

Section: Materials For the Active Retention Of Organicsmentioning

confidence: 99%

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

Dordio

Carvalho

2013

Journal of Hazardous Materials

196

View full text Add to dashboard Cite

“…A solid correlation typically exists between the apparent P retention capacity and the soluble Ca content of these materials (Zhu et al 1997, Ádám et al 2007b, Vohla et al, 2011. Retention capacities, however, are usually lower than for slag or red mud (see Table 1).…”

Section: Materials That Exhibit P Adsorption On Metal Oxidesmentioning

confidence: 99%

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

Klimeski¹,

Chardon²,

Туртола³

et al. 2012

AFSci

View full text Add to dashboard Cite

The application of phosphorus (P)-sorbing materials offers a possible solution for treating municipal wastewater and agricultural runoff. In this paper we discuss P retention and release mechanisms, and review studies on the P retention of different materials and their use as reactive media in filter beds. The main mechanisms for P retention are sorption on metal (mostly Fe or Al) hydroxide surfaces and, in alkaline conditions, the formation of Ca-P precipitates. The retention of P is strongly affected by the chemical composition of a material, its particle size and pH-related effects on sorption and precipitation both during testing and in practical operation. Laboratory tests are sensitive to solution chemistry (pH, alkalinity, ionic strength and composition, P concentration) and affected by material-to-solution ratio, contact time and agitation. Moreover, due to deviations from realistic field conditions, laboratory tests may produce imprecise estimates of the retention capacity and retention kinetics. In particular, materials that contain soluble substances (e.g., CaO) that elevate the pH of the ambient solution to high levels may in batch tests suggest a high capacity for P retention, but will most probably show much lower retention in field settings. On the other hand, materials containing metal oxides also retain P via slow reactions, and their retention capacity may be underestimated in short equilibrations. Appropriate laboratory test procedures will depend on their intended applications and material properties. Long-term field-scale tests are few in number, but some of them have shown promising results. Field-scale tests have, however, highlighted the design of the filters as a critical factor in their efficiency.

show abstract

Phosphorus sorption and chemical characteristics of lightweight aggregates (LWA)-potential filter media in treatment wetlands

Cited by 83 publications

References 0 publications

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

Effect of P-Reactive Drainage Aggregates on Green Roof Runoff Quality

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

Potential and limitations of phosphate retention media in water protection: A process-based review of laboratory and field-scale tests

Contact Info

Product

Resources

About