Mineralization of Nitrogen in Sewage Sludges

Mineralization of Nitrogen in Sewage Sludges
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污泥中氮的矿化

DOI：
10.2134/jeq1983.00472425001200010028x
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
L. Sommers
L. Sommers
中科院分区：
--
文献类型：
--
作者：
C. Parker;L. Sommers

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有机氮的矿化是决定污泥施用量的主要因素之一。在Fincastle粉砂壤土中研究了污泥有机氮的矿化作用，该土壤用美国几个地区污水处理厂的24种污水污泥处理。通过分析（i）土壤-污泥-砂混合物的渗滤液和（ii）未沥滤的土壤-污泥混合物的子样品中的无机氮，在16周的培养期间测定污泥有机氮的矿化。nonleached程序得到了略高的估计矿化氮在大多数污泥（平均17%和16%的N矿化nonleached和沥滤程序，分别）。污泥中可矿化氮的近似量表示为有机氮的百分比为：原材料和初级，25%;废物活化，40%;厌氧消化，15%;堆肥，8%。0.01M CaCl_2中高压灭菌或H_2SO_4 ~+ KMnO_2 ~+提取的污泥释放的无机氮与氮矿化的相关性不高。污泥有机氮含量是污泥氮矿化的合理预测因子。污泥有机氮在土壤中的矿化度回归方程为：污泥氮矿化度%= 6.37 ×污泥有机氮%+ 4.63（r = 0.77）。要计算适当的污泥施用率的农业作物，在最初的种植季节矿化污泥氮的百分比应与污泥处理或污泥中的有机氮浓度的过程中使用。
Mineralization of organic N is one of the principle factors governing the annual amount of sewage sludge applied to agricultural cropland. The mineralization of sludge organic N was studied in a Fincastle silt loam soil treated with 24 sewage sludges obtained from sewage treatment plants in several regions of the United States. The mineralization of sludge organic N was determined during a 16-week incubation by analysis of inorganic N in (i) leachates from soil-sludge-sand mixtures and (ii) subsamples of unleached soil-sludge mixtures. The nonleached procedure gave slightly higher estimates of mineralizable N in most sludges (average of 17 and 16% N mineralized by nonleached and leached procedures, respectively). The approximate amounts of mineralizable N in sludges expressed as a percentage of organic N were: raw and primary, 25%; waste-activated, 40%; anaerobically digested, 15%; and composted, 8%. Inorganic N released from sludges by autoclaving in 0.01M CaCl₂ or extracting with H₂SO₄ + KMnO₄ was not highly correlated with N mineralization. Sludge organic N content was a reasonable predictor of mineralization of sludge N added to soils. The following regression equation was found to describe the mineralization of sludge organic N in soil: % of added sludge N mineralized = 6.37 × % sludge organic N + 4.63 (r = 0.77). To calculate the appropriate sludge application rates for agronomic crops, the percentage of sludge N mineralized during the initial cropping season should be related either to the process used for sludge treatment or to the concentration of organic N in the sludge.