Indicated Microorganisms of Biological System in Feng Shan Si Wastewater Treatment Plant

• Main Authors: Hui-Ping Lee, 李惠萍
• Other Authors: Shu-Chu Tung
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/07733062860389941312

碩士 === 崑山科技大學 === 環境工程研究所 === 100 === This study site is located in the wastewater treatment plant in Kaohsiung Fengshan city. The research mainly focuses on observing the microorganisms in the trickling filter biological treatment system and the solid contact tank series system. The span of sampling is from January to December in 2010. The analysis of the BOD, the COD, the SS, the DO, water temperature and pH general water quality is made 3-5 times per week. The detection of coliform, SVI, the MLSS and the MLVSS is made 1 time per week. The observation of the microorganism samples from the solid contact tank and the trickling filter is made 1-2 times per week. The observations of the trickling filter biological treatment system show that the protozoan, Epistylis, has the highest appearance frequency, more than 100-200. It has a lower appearance frequency in March, July and August, when the number of protozoa is less than 100. Besides, transfer rotifers and spin rotifers have the second highest appearance frequency. Transfer rotifers can be found in each March, July and September, and the number of them is at least 100, more than 101-200 in the other months. Spin rotifers can be found in every month except August. The water quality in the treatment system can be good with a large number of rotifers, which is shown by the monthly average of the BOD in preliminary sedimentation decreasing from 46mg/L to 9mg/L through the biological treatment system. The protozoa and metazoan in the trickling filter are the most abundant in January, from April to June and from October to December throughout the year. The number of protozoa and metazoan is the smallest in March, when the operation hour of the trickling filter is adjusted, and only four kinds of microbial populations can be found with the number less than 100. The observations of the solid contact tank show that the free-swimming type of Aspidisca has the highest appearance frequency. It can be found in each month. The number of them is up to 201 in January, from April to June and in October. The smaller number of them appearing in February, August, September and from October to December is 101-200. The smallest number of them appearing in March and July is less than 100. The stalk ciliate, Vorticella, has the second highest appearance frequency, and it can be found in every month. The largest number of Vorticellas appearing in April, June and October is more than 201. The number of them is less than 100 in March. And the number of them is 101-200 in the other months. From April to May and from September to October, because of the biofilm peeling in the trickling filter, many protozoa, such as Epistylis, and metazoan, such as Colurella, can be observed in the water samples from the solid contact tank, and even more than seven kinds of biological populations can be found at the same time. The protozoa and metazoan in the solid contact tank are the most abundant in January, April, May and from October to December. The smallest number of them is in March. The BOD of effluent water in March is 9mg/L, and the COD is 21.6mg/L. Although both the BOD and the COD in March meet the effluent standard, they are both the highest throughout the whole year. In addition, a small number of Litonotus can be found from February to March and from June to July, when the number of them is less than 100 and they have the poorer activity to the recovery period in the activated sludge. Compared to the biological treatment system, the monthly average of BOD removal efficiency in March is 63.4 percent, lower to that in February, 77.1 percent, by 13.7 percent. And it is restored to more than 75 percent after April.