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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

一种新的磁盘介质，即，提出了一种表面具有突起的网状介质，用于促进可溶性基质向附着在旋转生物接触器（RBC）上的生物膜的外扩散，突起的高度为5mm，在2rpm下具有8个突起的扩散层厚度约为100 μ m，而没有突起的扩散层厚度约为200 μ m。为了减轻转盘的重量，采用了网状填料，发现在这种类型的填料上生物膜很发达，并且在固体和网状填料中的氨通量几乎相同。在传统的RBC系统中，最终澄清池用于分离处理后的废水和分离的生物质。分离的生物质在输送到最终澄清池的过程中暴露于槽中的湍流剪切。这样的暴露将分离的生物质分解成不能在澄清器中沉降的较小颗粒。因此，据报道，从RBC系统的流出物含有大量的小的有机颗粒，提供额外的BOD。在本研究中，建造了一个两层楼的RBC，以实现在槽中分离的生物质的同时去除。其上部和下部分别用作RBC和沉降生物质的储存空间。两层楼高的RBC在一个四级单元中运行。实验研究表明，双层生物反应器对生物质的去除效率很高，出水悬浮物浓度在10ppm左右。这意味着在两层RBC中可能不需要最终澄清器