New Perspective into the Impact of Drying Pretreatment on Phosphorus Performance in Sediments

• Published in: Current pollution reports Vol. 10; no. 3; pp. 362 - 373
• Main Authors: Wu, Zhuoman, Yin, Yuepeng, Pan, Wenxi, Tang, Jinyong, Cao, Xi, Zhang, Wen
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2024; Springer Nature B.V
• Subjects: Adsorption; air drying; Aluminum; Aluminum oxide; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Bioavailability; Biological effects; China; Dams; Drying ovens; Earth and Environmental Science; Environment; Environmental Law/Policy/Ecojustice; Eutrophication; Fractionation; Freeze drying; Industrial Pollution Prevention; Iron; lakes; Metal oxides; Monitoring/Environmental Analysis; Particle size; Performance evaluation; Phosphorus; Pollution; Pretreatment; Review; rivers; Sediments; Topical Collection on Water and Sediment Pollution; Waste Water Technology; Water Management; Water Pollution Control; Water quality; Yangtze River; China; Drying pretreatment; Phosphorus fractions; Adsorption properties; Sediment
• ISSN: 2198-6592; 2198-6592
• DOI: 10.1007/s40726-024-00305-x

Purpose of Review Different drying methods can cause errors in determining the content and evaluating the biological effectiveness of various forms of phosphorus (P) in sediment. The drying pretreatment effectively promotes the conversion of amorphous iron and aluminium oxides to their crystalline form, which ultimately impacts the adsorption capabilities of sediment. However, limited research has been conducted in this field previously. Sediments from the Weiyuan River, Baoenqiao Reservoir, and Honghu Lake in China were pretreated using freeze-drying, air-drying, and oven-drying methods. The effects of pretreatment methods on P were evaluated through P fractionation and isothermal adsorption experiments. The study also investigated the proportion and amount of amorphous iron and aluminium (Fe ox and Al ox ) transformed into crystalline forms. Recent Findings The results revealed that drying pretreatment markedly increased the potentially bioavailable P(BAP) (6.73%). This increase can be attributed to the rise in loosely-bound P (48.30%) and P bound to metal oxides (9.51%), which are predominant contributors to BAP. Furthermore, sediment adsorption performance significantly decreases after drying pretreatment. This is due to the reduced content of Fe ox (64.02%) and Al ox (36.61%), which exhibit higher P adsorption capacity. Additionally, drying led to a significant reduction in SP max (25.09%) and PSI (28.20%), along with an increase in EPC 0 (24.96%) and DPS (6.83%). Summary Different drying treatments affected the P forms and sorption properties of the sediment to varying degrees, with the overall effect being oven-drying > air-drying > freeze-drying > fresh samples. Consequently, when fresh sediment is not available for laboratory analysis, freeze-drying may be a more realistic method for characterizing P properties. Graphical Abstract