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A Basic Study on the Seawater Purification Function of the Biofilm Process Method and Its Strengthening

生物膜法海水净化功能及其强化的基础研究

基本信息

批准号：
03452215
负责人：
OSA Kazuki
金额：
$ 3.39万
依托单位：
OSAKA CITY UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452215/
关键词：
rockfilter-type biofilm process rockfilter-type oxidation process coefficient of reaction rate coefficient of removal coefficient of oxygen consumption rate coefficient of reoxygen rate seawater purifiation removal ratio 生物膜法汚濁海水有機物除

项目摘要

Laboratory experiments were performed to observe the characteristics of removal of organic matter, plant nutrients and suspended solids from real seawater through the rockfilter-type biofilm process. Based on the results of a series of systematic experiments, it was found that the removal process of COD, SS and so on through the rockfilter-type biofilm process could be expressed by the first-order reaction equiation and the coefficient of removal rate in the equation depended mainly on the mean velocity U of seepage flows through the rockfilter and the specific surface area A of the rockfilter. The coeffecients of removal rate for COD and SS and the coefficient if oxygen consumption rate were formulated empirically by the two physical quantities U and A.Applying these formulated purification characteristics of the rockfilter-type biofilm process to rubble embankments, the process of seawater purification due to tidal actions in a restricted coastal area enclosed by rubble embankments were predicted by means of the FEM.As a result, it was seen that the ultimate removal ratios through rubble embankments for COD and SS do not depend so much on the layout of embankments and the size of an enclosed coastal area, but mainly depend on the length of embankment. The ultimate removal ratio for SS increases considerably with the increase of the length of embankment up to about 15m and becomes almost constant when the length is larger than about 25m. As for COD, it increases gradually with the increases of the length. It may be finally proposed that the optimum length of embankment is about 10m to 12.5m.

通过实验室试验，考察了摇滤式生物膜工艺去除海水中有机物、植物营养物质和悬浮物的特性。根据一系列系统试验的结果，发现岩滤式生物膜工艺对COD、SS等的去除过程可用一级反应方程表示，方程中的去除系数主要取决于岩滤池的平均渗流速度U和岩滤池的比表面积A。用两个物理量U和A经验地建立了碎石路堤对COD和SS的去除系数和耗氧系数。将这些表述的岩滤式生物膜法的净化特性应用于碎石路堤，利用有限元方法对被碎石路堤包围的受限海岸地区潮汐作用下的海水净化过程进行了预测。结果表明，碎石路堤对COD和SS的最终去除速率与路堤的布置和封闭海岸的大小没有太大的关系，而主要取决于路堤的长度。当路堤长度达到15m左右时，SS的最终去除率随着路堤长度的增加而显著增加，当路堤长度大于25m时，SS的最终去除率几乎不变。而COD则随着长度的增加而逐渐增大。最终建议路堤长度以10~12.5m为宜。