Journal article
Lignin from rice straw Kraft pulping: effects on soil aggregation and chemical properties
Bioresource technology, Vol.98(7), pp.1482-1488
05/2007
Handle:
https://hdl.handle.net/2376/103311
PMID: 17126013
Abstract
Lignin contained in pulping liquor that is generated during the pulping process for papermaking is a disposal problem for the pulp and paper industry. Separating lignin and other organic components from pulping liquor with inorganic acids may improve its applicability to fields as a beneficial soil amendment while offering a potential disposal alternative. Sulfuric acid-precipitated lignin from rice straw pulping liquor applied at rates of 1.67 and 3.34 g C kg(-1) soil was incubated to evaluate its effects on soil properties over 8 weeks of incubation. Addition of this acid-precipitated lignin at these rates decreased soil pH by 0.24-0.53 units over 8 weeks of incubation, suggesting that this sulfuric acid-precipitated lignin from pulping liquor may have potential as a soil acidifying agent. Soil electrical conductivity (EC) only increased by up to 0.36 d Sm(-1), but highest EC levels were less than 4 d Sm(-1), indicating that lignin applied at both rates would not cause salinity problems. Application of this lignin increased soil organic C by 1.46 and 3.13 g C kg(-1), and total soil N by 0.07 and 0.17 g N kg(-1) over the incubation period. Lignin improved the macroaggregation of >2mm size fraction, and increased wet microaggregate stability of >2mm and 0.5-0.25 mm aggregates compared to a nonamended control. The results of this study suggest that this acid-precipitated lignin from pulping liquor may have potential as a beneficial soil amendment.
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Details
- Title
- Lignin from rice straw Kraft pulping: effects on soil aggregation and chemical properties
- Creators
- C Xiao - Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420, United StatesR BoltonW L Pan
- Publication Details
- Bioresource technology, Vol.98(7), pp.1482-1488
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- England
- Identifiers
- 99900546798601842
- Language
- English
- Resource Type
- Journal article