利用寡毛类蠕虫反应器处理剩余污泥的研究

考察了一种新型寡毛类蠕虫反应器(由游离型蠕虫生长区和附着型蠕虫生长区组成)处理排放剩余污泥的效果．在试验的启动阶段1^#反应器接种了颤蚓(Tubificidae)，2^#反应器作为对照．对照试验的结果表明，整个试验运行期间，颤蚓始终存于1^#反应器中，并且主要附着在填料上和聚集在反应器底部．从第35天开始，2个反应器中均发现了游离型蠕虫如红斑瓢体虫(Aeolasoma)、仙女虫(Nais)和叉形管盘虫(Aulophorus)．蠕虫生长有助于污泥减量和改善污泥沉降性能，并且颤蚓的存在和生长可导致更显的污泥减量效果．整个试验期间，1^#反应器的平均污泥减量效果为57％，远高于对照反应器．高浓度NH4^ -N对蠕虫有毒害作用，从而抑制了蠕虫的生长．寡毛类蠕虫的生长对硝化过程没有影响，但会导致一定程度的氮、磷释放。

Effects of oligochaete reactor on treating the discharged excess sludge

A new worm-reactor, consisting of free-swimming and sessile worm growing sections, was developed to be habitat for worm stable growth. Two bench worm reactors were used to treat the discharged excess sludge, and comparison experiments were carried out to investigate the sludge reduction with oligochaetes. Tubificidae was selected and inoculated in the start-up phase of Reactor 1 operation, and Reactor 2 was as the control. Tubificidae was present in Reactor 1 throughout the operation period after its inoculation, and mainly attached on the carriers and aggregated on the bottom of the worm-reactor. Free-swimming worms such as Aeolosoma, Aulophorus and Nais were found in both reactors since the 35 th day. Microscopic investigation showed that these free-swimming worms naturally produced in the pilot activated sludge system and then came into worm reactors along with the discharged excess sludge. Results clearly showed that the average sludge reduction in Reactor 1 was 57%, much higher than that in the control, but the presence of Tubificidae was much better than free-swimming worms for sludge reduction. The characteristics of sludge settling was improved by presence of both Tubificidae and free-swimming worms. High ammonia nitrogen concentration in influent was toxic to worms, and then limited worm growth. The growth of oligochaetes growth had little impact on the nitrification process, but resulted in somewhat release of nitrogen and phosphorus into effluent.