Performance of sludge drying reed beds for the leachate purification: Effects of sludge loading frequencies and plant species
Language English Country Netherlands Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
33188766
DOI
10.1016/j.envres.2020.110452
PII: S0013-9351(20)31349-9
Knihovny.cz E-resources
- Keywords
- Leachate purification, Plant species, Sludge drying reed beds, Sludge loading frequencies,
- MeSH
- Water Pollutants, Chemical * MeSH
- Water Purification * MeSH
- Nitrogen analysis MeSH
- Phosphorus analysis MeSH
- Biological Oxygen Demand Analysis MeSH
- Wetlands MeSH
- Waste Disposal, Fluid MeSH
- Sewage MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Water Pollutants, Chemical * MeSH
- Nitrogen MeSH
- Phosphorus MeSH
- Sewage MeSH
Sludge drying reed beds (SDRBs), as a natural biological technology, have positive effects on surplus sludge treatment. However, few studies focus on the sludge leachate purification in the SDRBs regarding the wetland plant species and sludge loading rates. In this study, four SDRBs planted with two wetland plant species (Phragmites australis, Typha angustifolia) were investigated for leachate purification under six sludge loading volumes and feeding frequencies (9L/3d, 6L/3d, 4L/d, 3L/d, 2.5L/d, and 2L/d). Results showed that the lowest Escherichia coli content of 630 number/mL was determined in the P. australis SDRBs, with 86.2-92.8% lower than those in the T. angustifolia controls. However, similar removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), ammonium (NH4+), total phosphorus (TP), and heavy metals were obtained in the SDRBs with both plant species. Moreover, the optimum sludge loading volume and feeding frequency of 3L/d was determined in the P. australis system, with pollutants (COD, TN, NH4+, and TP) mass removal efficiencies in the leachate being over 94.9%. In addition, the principal component analysis indicated that water loss and oxidation-reduction potential had positive influences on pollutant removal in the planted SDRBs. Overall, the best leachate removal efficiency was obtained in the P. australis SDRBs under the sludge loading volume and feeding frequency of 3L/d.
References provided by Crossref.org
