Greenhouse Evaluation of Struvite and Sludges from Municipal Wastewater Treatment Works as Phosphorus Sources for Plants

✍ Scribed by Plaza, César; Sanz, Rafael; Clemente, Cristina; Fernández, José M.; González, Ricardo; Polo, Alfredo; Colmenarejo, Manuel F.

• Book ID: 127246366
• Publisher: American Chemical Society
• Year: 2007
• Tongue: English
• Weight: 687 KB
• Volume: 55
• Category: Article
• ISSN: 0021-8561
• DOI: 10.1021/jf071563y

✦ Synopsis

Sewage sludge obtained by a conventional aerobic activated sludge process (CSS), P-rich sewage sludge from an enhanced biological P removal process (PRS), and struvite (MgNH 4 PO 4 • 6H 2 O) recovered from an anaerobic digester supernatant using a low-grade MgO byproduct from the calcination of natural magnesite as a Mg source (STR) were evaluated as P sources for plant growth. For this purpose, a greenhouse pot experiment was conducted using a P-deficient loamy sand soil and perennial ryegrass (Lolium perenne L.) as the test crop. The P sources were applied at rates equivalent to 0, 9, 17, 26, 34, and 44 mg/kg P. Single superphosphate (SUP) was used as reference for comparison with the other P sources. The results obtained indicated that STR was as effective as SUP in increasing the dry matter yield and supplying P to ryegrass. Compared to SUP and STR, PRS and especially CSS exhibited less agronomic effectiveness as P sources, which may be attributed, at least partially, to greater soil P fixation because of the larger amount of Fe incorporated with these materials.