Decontamination of anaerobically digested slurry in a paddy field ecosystem in Jiaxing region of China

Lu, Jun, Jiang, Lina, Chen, Dingjiang, Toyota, Koki, Strong, P. James, Wang, Hailong and Hirasawa, Tadashi (2012) Decontamination of anaerobically digested slurry in a paddy field ecosystem in Jiaxing region of China. Agriculture, Ecosystems and Environment, 146 1: 13-22. doi:10.1016/j.agee.2011.10.011

Author Lu, Jun
Jiang, Lina
Chen, Dingjiang
Toyota, Koki
Strong, P. James
Wang, Hailong
Hirasawa, Tadashi
Title Decontamination of anaerobically digested slurry in a paddy field ecosystem in Jiaxing region of China
Journal name Agriculture, Ecosystems and Environment   Check publisher's open access policy
ISSN 0167-8809
Publication date 2012-01-01
Sub-type Article (original research)
DOI 10.1016/j.agee.2011.10.011
Open Access Status Not yet assessed
Volume 146
Issue 1
Start page 13
End page 22
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Anaerobic digestion has become increasing popular for managing biowastes in rural China as it has the advantage of generating biogas, a renewable energy. A new challenge, however, is minimizing the environmental pollution resulting from the anaerobically digested slurry (ADS). The aim of this study was to assess the feasibility of using a paddy field to remediate ADS while simultaneously cultivating rice. A field experiment was trialed using six treatments based on varying nitrogen loadings over the period of a rice-growing season. These treatments were adjusted to the content of the N within the ADS and had loadings of 270, 405, 540 and 1080kgNha -1. These treatments were compared to a negative control (no fertilizer) and a positive control (chemical fertilizer) that consisted of urea applied at 270kgNha -1. The effects of these N sources and slurry remediation were monitored using standard methods to measure water quality, soil properties and changes in rice production. Rice grain yields were generally higher for all ADS treatments than for the urea N treatment. Standing water quality in the field could reach national discharge standards for all treatments within 7-8 days after each ADS irrigation. Groundwater quality and heavy metal concentrations in both soil and the rice grain were not affected by the ADS treatments. We suggest that the quantities of ADS irrigated in 867-1734m 3ha -1 was not only safe for food quality (rice grain) and the receiving environment (water and soil), but also beneficial to soil fertility and rice grain yield.
Keyword Anaerobically digested slurry
Heavy metal
Paddy field
Rice grain yield
Soil fertility
Water quality
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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