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

文献类型： 外文期刊

第一作者： Lu, Jun

作者： Lu, Jun;Chen, Dingjiang;Jiang, Lina;Toyota, Koki;Hirasawa, Tadashi;Strong, P. James;Wang, Hailong

作者机构：

关键词： Anaerobically digested slurry;Paddy field;Soil fertility;Water quality;Rice grain yield;Heavy metal

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN： 0167-8809

年卷期： 2012 年 146 卷 1 期

页码：

收录情况： SCI

摘要： 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 1080 kg N ha(-1). These treatments were compared to a negative control (no fertilizer) and a positive control (chemical fertilizer) that consisted of urea applied at 270 kg N ha(-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(3) ha(-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. (C) 2011 Elsevier B.V. All rights reserved.

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