Ohno T, Erich M S
Department of Plant, Soil & Environmental Sciences, Deering Hall, University of Maine, Orono, ME 04469, USA.
Environ Pollut. 1993;79(2):175-80. doi: 10.1016/0269-7491(93)90067-x.
The burning of a papermill sludge and wood mixture and landspreading the resulting ash is a potential means of disposal of papermill sludge without the use of valuable landfill space. This study evaluated the effectiveness of ashes derived from a mixture of papermill sludge and wood sources to act as an alternative liming agent. The calcium carbonate equivalence of the material was determined using a 91-day laboratory incubation test with three mineral soils and one organic horizon soil. Application rates of soil-incorporated sludge-ash ranged from 2.30 to 32.2 g per kg soil. Soil pH increased linearly with increasing sludge-ash application rate. The calcium carbonate equivalence of the material varied temporally and the average value ranged from 19% to 28%. The fraction of total P, K and Mg added with the sludge-ash and extracted from the ash-amended soils using an NH4OAc based soil test method were 2.6, 3.8 and 17.6%, respectively. The low soil test extractability of ash-derived plant nutrients suggests that this material would provide only a modest increase in plant available nutrient levels in landspread fields.
燃烧造纸厂污泥与木材的混合物，并将产生的灰烬进行土地施用，这是一种在不占用宝贵填埋空间的情况下处置造纸厂污泥的潜在方法。本研究评估了源自造纸厂污泥与木材混合物的灰烬作为替代石灰改良剂的有效性。使用三种矿质土壤和一种有机层土壤进行了为期91天的实验室培养试验，以测定该材料的碳酸钙当量。掺入土壤的污泥灰施用量为每千克土壤2.30至32.2克。土壤pH值随污泥灰施用量的增加呈线性增加。该材料的碳酸钙当量随时间变化，平均值在19%至28%之间。通过基于NH4OAc的土壤测试方法从添加了污泥灰的土壤中提取的、随污泥灰添加的总磷、钾和镁的比例分别为2.6%、3.8%和17.6%。源自灰烬的植物养分在土壤测试中的低提取率表明，这种材料只会使土地施用田地中植物可利用的养分水平适度增加。
