Yang Gege, Xing Meiyan, Liu Jing, Yang Jian
The Institute of Biofilm Technology, 1239 Siping Road, Shanghai, China.
Key Laboratory of Yangtze River Water Environment, Ministry of Education, 1239 Siping Road, Shanghai, China.
Environ Sci Pollut Res Int. 2017 Mar;24(7):6688-6697. doi: 10.1007/s11356-016-8086-y. Epub 2017 Jan 13.
The present study focuses on optimizing filter depth on sludge reduction in a four-stage vermifiltration during the course of treating excess sludge continuously. The results indicated that when the filter depth exceeded 75 cm, though the fourth stage can further advance the sludge reduction, its contribution for the total sludge reduction was lower than 10%, while the aerobic bacteria, especially the dominant bacteria (Proteobacteria and Bacteroidetes), kept a high similarity as the filter depth varied. Furthermore, earthworm activities attributed to aerobic bacteria being preferentially selected in the system, positively supporting the organic decomposition. As far as economic cost and process performance are concerned, a 75-cm vermifilter was recommended to efficiently and economically achieve the required standard for sewage sludge reduction and stabilization.
本研究着重于在连续处理剩余污泥的过程中，优化四级蚯蚓过滤中污泥减量的滤层深度。结果表明，当滤层深度超过75厘米时，尽管第四阶段可进一步促进污泥减量，但其对总污泥减量的贡献低于10%，而随着滤层深度变化，好氧细菌，尤其是优势菌（变形菌门和拟杆菌门）保持高度相似性。此外，蚯蚓活动促使系统优先选择好氧细菌，对有机分解起到积极的支持作用。就经济成本和工艺性能而言，建议采用75厘米的蚯蚓滤池，以高效且经济地达到污水污泥减量和稳定化的所需标准。
