Assessment of plant available nutrients in organic products using an airlift bioreactor
Assessment of plant available nutrients in organic products using an airlift bioreactor
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使用气升式生物反应器评估有机产品中的植物有效营养成分
DOI：
10.2134/jeq1998.00472425002700050035x
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
B. Janssen
中科院分区：
文献类型：
--
作者：
G. Velthof;M. L. Beusichem;W.M.F. Raijmakers;B. Janssen
废物产品可以从垃圾填埋场转移，并用作肥料时，这些产品中的养分供应可以可靠地确定。本研究的目的是确定是否有氧培养内循环气升式生物反应器是一种可靠的方法，用于评估植物有效的N和P的有机废物产品。发表的结果与黑麦草盆栽实验作为参考有效的N和P。在气升式反应器中的孵化也进行了比较，与传统的聚乙烯袋孵化。将八种不同有机产物的样品在保持在pH 5的气升式反应器中孵育20天。通过测量反应器溶液中的无机物浓度来确定植物可利用的N部分，并且通过使用氧化铁涂覆的滤纸从溶液中提取P来确定植物可利用的P部分。在气升式反应器中测定的有机产物中有效氮含量与黑麦草吸氮量密切相关（R2 = 0.73）。对于P，气升式反应器中提取的P与黑麦草对P的吸收之间没有相关性。气升式反应器中培养评估有机废物中植物有效N比黑麦草盆栽试验更快速，比聚乙烯袋中常规培养更可靠。我们建议在不同的气升式反应器中测定植物有效N和P，因为可能与pH相关的P溶解，并且因为氧化铁涂层过滤器含有NH4+，这可能会妨碍N的测定。
Waste products can be diverted from landfill and used as fertilizer when the nutrient availability in these products can be reliably determined. The aim of this study was to determine whether aerobic incubation in an internal-loop airlift bioreactor is a reliable method for assessing plant-available N and P in organic waste products. Published results of pot experiments with ryegrass were used as a reference for available N and P. The incubation in the airlift reactor was also compared with conventional incubation in polyethylene bags. Samples of eight different organic products were incubated for 20 d in airlift reactors maintained at pH 5. The plant-available N fraction was determined by measuring inorganic concentrations in the reactor solution, and the plant-available P fraction was determined by extraction of P from the solution using iron oxide-coated filter paper. The available N fraction in the organic products as determined in the airlift reactor was closely related (R 2 = 0.73) with the N uptake by ryegrass (Lolium perenne L.). For P, there was no relationship between the P extracted in the airlift reactor and the P uptake by ryegrass, The incubation in the airlift reactors to assess plant-available N in organic waste products was more rapid than the pot experiment with ryegrass and was more reliable than the conventional incubation in polyethylene bags. We recommend that plant-available N and P be determined in different airlift reactors, because of possible pH-related P dissolution and because the iron oxide-coated filters contain NH 4 + which may hamper determination of N.