Elemental composition and phosphorus availability in hydrochars from seaweed and organic waste digestate

被引:9
|
作者
Loes, Anne-Kristin [1 ]
Sandquist, Judit [2 ]
Meyer, Gregor [3 ]
机构
[1] Norwegian Ctr Organ Agr, Gunnars Veg 6, N-6630 Tingvoll, Norway
[2] SINTEF Energy Res, Trondheim, Norway
[3] Swiss Fed Inst Technol, Inst Agr Sci, Lindau, Switzerland
来源
ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE | 2018年 / 68卷 / 01期
关键词
Sequential extraction; marine algae; hydrothermal liquefaction; carbonization; potential toxic elements; carbon sequestration; SOIL; PHOSPHATE; ASH; KEY;
D O I
10.1080/09064710.2017.1363909
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
By hydrothermal liquefaction (HTL) of organic matter, hydrochars are produced which may be applied to soil for carbon sequestration. From substrates of wild seaweed and organic waste digestate, we measured the distribution of solids (hydrochars) and liquids after HTL at 150 and 200 degrees C, 50bar for 1h. The output of liquids and solids was recorded. Elemental analysis was conducted for essential plant nutrients, potentially toxic elements (PTEs) and silicon in the hydrochars. Sequential extraction of phosphorous (P) was conducted to assess the P availability for plants. About 20% of the initial dry matter dissolved during HTL of digestate, and 55% for seaweed. More dry matter was dissolved by increased temperature. Except from arsenic in seaweed chars, the concentrations of PTEs were below quality compost thresholds. About 85% of P was recovered in chars for digestate. For seaweed, the recovery was 97% at 150 degrees C, decreasing to 84% at 200 degrees C. The solubility of P in chars decreased by HTL, and more with higher temperature. Reduced P availability, especially by higher temperature, is negative for the immediate fertilization effect. However, for soil sequestration of carbon, reduced P availability in hydrochars may expand the area where application may occur without negative environmental effects of eutrophication of water bodies.
引用
收藏
页码:57 / 66
页数:10
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