Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
Institute of Agricultural Resources and Environment, Guizhou Academy of Agricultural Sciences, Guiyang, 550006, China.
Sci Rep. 2018 Sep 17;8(1):13872. doi: 10.1038/s41598-018-32141-7.
This study investigates the influence of inoculated and uninoculated aeration pretreatment on nutrients and phytotoxicity of anaerobic digestion (AD) effluent. Swine manure AD effluent was inoculated with activated and anaerobic sludge, respectively. Our results show that aeration with the addition of activated sludge could reduce the phytotoxicity of AD effluent. Compared to the control treatment without any sludge addition, the addition of activated sludge resulted in a more significant reduction in the AD effluent salinity, NH content, and organic matter (indicated by the chemical oxygen demand) when AD effluent was aerated for less than 8 hours. As a result, a much higher seed germination index (GI) was observed for the treatment with activated sludge addition, particularly when aerated for 4-5 hours, contributing the gas/water ratio of 20:1-30:1. On the other hand, no significant differences in the nutrient contents and GI value were observed for the control treatment and that with the addition of anaerobic sludge. Results from this study shed light on optimizing the management of AD effluent for agricultural application.
本研究调查了接种和未接种曝气预处理对厌氧消化（AD）出水的养分和植物毒性的影响。猪粪 AD 出水分别接种了活性污泥和厌氧污泥。我们的结果表明，添加活性污泥的曝气可以降低 AD 出水的植物毒性。与未添加任何污泥的对照处理相比，当 AD 出水曝气时间少于 8 小时时，添加活性污泥可使 AD 出水中的盐度、NH 含量和有机物（以化学需氧量表示）的去除率显著提高。因此，添加活性污泥的处理中种子发芽指数（GI）更高，尤其是曝气 4-5 小时时，气水比为 20:1-30:1。另一方面，对于对照处理和添加厌氧污泥的处理，养分含量和 GI 值没有显著差异。本研究结果为优化 AD 出水的农业应用管理提供了依据。
