Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Stability of P Saturated Water Treatment Residuals under Different Levels of Dissolved Oxygen
Water treatment residuals (WTRs) are effective phosphorus (P) immobilizers that have been used in constructed wetlands (CWs). In CWs, dissolved oxygen (DO) levels vary from location to location and fluctuate over time. Therefore, this work accessed the stability of P saturated ferric and alum water treatment residuals (FARs) under low (<1 mg/L), medium (2–4 mg/L), and high (5–8 mg/L) DO levels. In the experiments, which had a 40‐day duration, three stages of P release from the P saturated FARs were observed: an initial rapid P desorption stage, followed by a P re‐adsorption stage, and a P desorption balance stage. The strongest bonding between P and FARs occurred at the low DO level. A limited amount of Fe and Al was released from the P saturated FARs. Interestingly, the P in the FARs tended to transform from the Al bound P to the Fe bound P, and this transformation was stronger at lower DO levels. However, no more than 1.12% of the total P in the P saturated FARs was desorbed under any of these DO levels. Therefore, FARs can be considered as a safe P adsorption medium for CWs.
Stability of P Saturated Water Treatment Residuals under Different Levels of Dissolved Oxygen
Water treatment residuals (WTRs) are effective phosphorus (P) immobilizers that have been used in constructed wetlands (CWs). In CWs, dissolved oxygen (DO) levels vary from location to location and fluctuate over time. Therefore, this work accessed the stability of P saturated ferric and alum water treatment residuals (FARs) under low (<1 mg/L), medium (2–4 mg/L), and high (5–8 mg/L) DO levels. In the experiments, which had a 40‐day duration, three stages of P release from the P saturated FARs were observed: an initial rapid P desorption stage, followed by a P re‐adsorption stage, and a P desorption balance stage. The strongest bonding between P and FARs occurred at the low DO level. A limited amount of Fe and Al was released from the P saturated FARs. Interestingly, the P in the FARs tended to transform from the Al bound P to the Fe bound P, and this transformation was stronger at lower DO levels. However, no more than 1.12% of the total P in the P saturated FARs was desorbed under any of these DO levels. Therefore, FARs can be considered as a safe P adsorption medium for CWs.
Stability of P Saturated Water Treatment Residuals under Different Levels of Dissolved Oxygen
Wang, Changhui (Autor:in) / Fei, Chengbo (Autor:in) / Pei, Yuansheng (Autor:in)
CLEAN – Soil, Air, Water ; 40 ; 844-849
01.08.2012
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Stability of P Saturated Water Treatment Residuals under Different Levels of Dissolved Oxygen
| Online Contents | 2012
Beneficial Reuse of Water Treatment Plant Residuals
| British Library Conference Proceedings | 1996
Finding New Opportunities For Water Treatment Residuals
| British Library Conference Proceedings | 2005
Heat-water-stress Coupling Model for Saturated Frozen Soil under Different Stress Levels
| Springer Verlag | 2024