DEVELOPMENT OF NEW ROTATING BIOLOGICAL CONTACTOR WITH SURFACE PROTRUSIONS AND SOLID-LIQUID SEPARATION

新型表面凸起固液分离旋转生物接触器的研制

基本信息

批准号：
62550401
负责人：
WATANABE Yoshimasa
金额：
$ 1.15万
依托单位：
MIYAZAKI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

A new disk media,i.e.,reticulated media with the surface protrusions,has been proposed to promote the external diffusion of soluble substrates to the biofilm attached to the Rotating Biological contactor(RBC).The height of protrusions was 5 mm. The diffusion layer thickness with 8 protrusions at 2 rpm was about 100 m,while it was about 200 m without protrusion. In order to reduce the disk weight,a reticulated media was used and it was found that the biofilm was well developed on this type of media, and ammonia fluxes were the almost the same in the solid and reticulated media.In a conventional RBC system,the final clarifier has been used to separate the treated waste-water and detached biomass. The detached biomass is exposed to the turbulent shear in the trough during the transport process to the final clarifier. Such an exposure breaks down the detached biomass into smaller particles which can not settle in the clarifier. As a result,it has been reported that the effluent from the RBC system containes a lot of small organic particles which offer the additional BOD. in this research,a two-story RBC was constructed to achieve the simul-taneous removal of the detached biomass in the trough. Its upper part and lower part function as the RBC and storage space of the settled biomass,respectively. The two-story RBC was operated in a four-staged unit. Experimental investigation showed that the removal efficiency of detavhed biomass in the two-story RBC was very hig to result in the effluent suspended solid concentra-tion of about 10 ppm. It means that the final clarifier may not be necessary in the two-story RBC

已经提出了一种新的磁盘介质，即带有表面突起的网状培养基，以促进可溶性底物向旋转生物接触器（RBC）附着的生物膜的外部扩散。突出的高度为5 mm。在2 rpm时，具有8个突起的扩散层厚度约为100 m，而无突出的约200 m。为了减轻磁盘的重量，使用了网状介质，发现生物膜在这种类型的培养基上发育良好，氨水在固体和网状介质中几乎相同。在常规的RBC系统中，最终的澄清仪已用于将处理过的废水和分离的生物质分开。在运输过程中，分离的生物量暴露于槽中的湍流剪切物。这样的暴露将分离的生物量分解为无法在澄清器中沉降的较小颗粒。结果，据报道，来自RBC系统的废水包含许多提供额外BOD的小有机颗粒。在这项研究中，建造了两层楼高的RBC，以实现槽中分离的生物质的模拟去除。它的上部和下部分别充当定居生物量的RBC和存储空间。两层楼的RBC在一个四级单元中运营。实验研究表明，在两层RBC中，DITAVHED生物量的去除效率非常高，可导致废水悬浮的固体浓度约为10 ppm。这意味着在两层楼高的RBC中可能不需要最终澄清器