Effect of heating treatments on nitrogen mineralization from sewage sludge
Effect of heating treatments on nitrogen mineralization from sewage sludge
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DOI：
10.1111/j.1747-0765.2006.00061.x
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发表时间：
2006-08
影响因子：
2
通讯作者：
K. Matsuoka;N. Moritsuka;T. Masunaga;K. Matsui;T. Wakatsuki
中科院分区：
文献类型：
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作者：
K. Matsuoka;N. Moritsuka;T. Masunaga;K. Matsui;T. Wakatsuki
污泥加热对污泥的农业循环利用具有多方面的好处，其中之一是热诱导污泥中N矿化的变化。为了加强对这一现象的理解和实际应用，我们将污水污泥在120°C或180°C下加热处理16小时，其中有或没有空气干燥作为预处理。在84天的好氧孵育期间，无论土壤类型和孵育期间的温度如何，120°C的风干污泥加热显著加速了安多索、氟维索、阿瑞诺索和阿克瑞索样品混合的污泥的N矿化，180°C的加热显著延缓了N矿化。在120°C或180°C下对湿污泥进行更常规的热干燥也会产生类似但不太明显的效果。这些热引起的变化归因于污泥有机氮的转化，因为在加热处理过程中N的挥发可以忽略不计。污泥N的顺序提取可以检测到热诱导的N转化，可以解释部分但不是全部的培养结果，这表明在加热的污泥材料中，N的矿化不仅取决于化学可提取性，还取决于其他因素。我们的研究结果表明，污泥加热调节了氮矿化速度，为从污泥中生产各种有机氮肥提供了一种有前途的方法。
Abstract Heating of sewage sludge has multifunctional benefits for agricultural recycling of sludge, one of which is the heat-induced changes in N mineralization from the sludge. To enhance the understanding and practical use of this phenomenon, we subjected sewage sludge to heating treatments at 120°C or 180°C for 16 h with or without air-drying as a pretreatment. During the 84-day aerobic incubation period, N mineralization from the sludge mixed with samples of an Andosol, a Fluvisol, an Arenosol and an Acrisol was significantly accelerated by the heating of air-dried sludge at 120°C and was significantly retarded by heating at 180°C, regardless of the soil types and temperatures during the incubation period. More conventional heat-drying of moist sludge at 120°C or 180°C also exerted similar but less pronounced effects. These heat-induced changes were attributed to the transformation of sludge organic N, because volatilization of N during the heating treatments was negligible. Sequential extraction of sludge N enabled detection of the heat-induced N transformations accounting for some but not all of the incubation results, indicating that mineralization of N in the heated sludge materials was determined not only by chemical extractability but also by other factors. Our results suggest that heating of sewage sludge regulates the rate of N mineralization and presents a promising method for producing various organic N fertilizers from sewage sludge.