Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing, 100193, China.
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.
Chemosphere. 2018 Jul;203:490-496. doi: 10.1016/j.chemosphere.2018.03.170. Epub 2018 Mar 26.
In this study, we investigated the impact of intensive aeration pre-treatment on nutrient contents and phytotoxicity of anaerobically digested manure centrate. Activated sludge from conventional wastewater treatment plants was added to reinforce the aeration process. Results show that the addition of activated sludge did not negatively affect the nutrient contents, but significantly reduced the phytotoxicity of digested centrate, as indicated by an enhancement of seed germination index, during the aeration treatment. Based on the orthogonal experiment and following statistical analysis, the lowest phytotoxicity of digested centrate could be achieved under the aeration conditions: sludge concentration of 6 g/L, aeration time of 2 h, gas/water ratio of 40:1, and pH = 6.5. Of these operational parameters, the digested centrate pH dominantly determined its nutrient contents (e.g., amino acids, total phosphorus, and ammonium) and phytotoxicity. These results were further verified by hydroponic experiments, which showed that using digested centrate after sludge enhanced aeration as the nutrient solution facilitated the growth and dry biomass of maize.
在本研究中，我们调查了强化曝气预处理对厌氧消化粪肥浓缩液中养分含量和植物毒性的影响。添加来自传统污水处理厂的活性污泥来加强曝气过程。结果表明，添加活性污泥不会对养分含量产生负面影响，但会显著降低消化浓缩物的植物毒性，这可通过曝气处理期间种子发芽指数的提高来指示。基于正交实验和后续的统计分析，在曝气条件下可达到消化浓缩物的最低植物毒性：污泥浓度为 6g/L、曝气时间为 2h、气/水比为 40:1 和 pH=6.5。在这些操作参数中，消化浓缩物的 pH 主要决定其养分含量（例如氨基酸、总磷和铵）和植物毒性。水培实验进一步验证了这些结果，表明使用经过增强曝气的污泥强化后的消化浓缩物作为营养液可促进玉米的生长和干生物量。
