ABSTRACT

The pyrolysis treatment can effectively reduce the sewage sludge volume and fix its nutrients for land application. The synergistic effect on the fixation of nutrients can be better exerted by the sewage sludge biochars (SSB) prepared by the co-pyrolysis method. In this study, SSB was prepared by adding stalks and mineral materials in to sewage sludge that was used as the base material. The element composition, nutrient stability, and adsorption effect of SSB, as well as the feasibility of applying modified SSB in reducing soil nutrients leaching, were discussed in this study. The results indicate that the modified SSB reduced the amount of nitrate leaching and has the ability to remove nutrients in the solution, among which the removal effect of nitrate is better. Moreover, the modified SSB is added to the soil by leaching experiments in soil columns, which can reduce the leaching of nutrients.

摘要

热解处理可有效减少污水污泥量，固定其养分，以供土地使用。通过共热解法制备的污水污泥生物炭可以更好地发挥对养分的协同作用。在这项研究中，SSB是通过将秸秆和矿物材料添加到用作基础材料的污水污泥中来制备的。研究了SSB的元素组成，养分稳定性和吸附效果，以及应用改良的SSB减少土壤养分淋失的可行性。结果表明，改性SSB减少了硝酸盐的浸出量，具有去除溶液中营养的能力，其中硝酸盐的去除效果更好。此外，