生物滤池污泥的生态稳定试验研究

Vermi-stabilization of Sludge from Trickling-Filter

采用生态滤池对高负荷生物滤池所产生的生物膜污泥进行分解稳定的中型试验。生态滤池由布水区、滤床和排水区3部分组成。滤床中蚯蚓等各种微型动物和微生物共同组成复杂的生态系统,将生物膜污泥作为生长代谢营养源,集污泥浓缩、稳定、调理、脱水、处置和综合利用等多种功能。当生态滤池水力负荷3.0m3/(m2·d),污泥负荷(SS)0.18kg/(m2·d)时,生物膜污泥可被滤床的生态系统所吸收和稳定,过滤后出水各项指标可达到国家一级排放标准。生态滤池中少量增殖的蚯蚓和蚓粪可用作饲料和高效农肥。该方法处理生物污泥具有节能和造价、运行费用低廉,管理方便,解决污泥最终处置问题等特点。

Vermi-stabilization, i.e., sludge stabilization and de-watering using earthworms, has been successfully tested on a pilot base with hydraulic loading of 3.0m3/ m2·d and disposal was provided by the capacity for stabilization and de-watering in one step, as compared with thickening, digestion, conditioning, and de-watering in a conventional process. The filter included a sludge aspersion, an active layer where earthworms act as decomposer, and a drainage system of the effluent. The earthworms and the earthworm feces produced in the bed could be utilized for feed lot and high grade fertilizer. The process will save investment as well as the operation and maintenance costs, have lower energy consumption and an easier maintenance than the conventional process.