Plaza César, Sanz Rafael, Clemente Cristina, Fernández José M, González Ricardo, Polo Alfredo, Colmenarejo Manuel F
Centro de Ciencias Medioambientales, Consejo Superior de Investigaciones Científicas, Serrano 115 dpdo., 28006 Madrid, Spain.
J Agric Food Chem. 2007 Oct 3;55(20):8206-12. doi: 10.1021/jf071563y. Epub 2007 Sep 19.
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 4PO 4 x 6H 2O) 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.
对通过传统好氧活性污泥法获得的污水污泥（CSS）、来自强化生物除磷工艺的富磷污水污泥（PRS）以及使用天然菱镁矿煅烧产生的低品位氧化镁副产品作为镁源从厌氧消化池上清液中回收的鸟粪石（MgNH₄PO₄·6H₂O，STR）作为植物生长的磷源进行了评估。为此，使用缺磷的壤质砂土和多年生黑麦草（Lolium perenne L.）作为试验作物进行了温室盆栽试验。磷源的施用量相当于0、9、17、26、34和44 mg/kg磷。过磷酸钙（SUP）用作与其他磷源比较的参考。所得结果表明，STR在提高黑麦草干物质产量和供应磷方面与SUP一样有效。与SUP和STR相比，PRS尤其是CSS作为磷源的农学有效性较低，这可能至少部分归因于这些材料中所含铁量较大导致土壤对磷的固定作用更强。
