TY - SER AU - Chatree Kulchatchai AU - Samorn Muttamara, AU - Nguyen,Cong Thanh AU - Vigneswaran,Saravanamuthu ED - Federal Republic of Germany (DAAD), TI - Behavior of slow sand filter on treating the effluent from horizontal coconut husk fiber prefilter tube T2 - Special studies project report PY - 1984/// CY - Bangkok PB - Asian Institute of Technology KW - Filters and filtration N1 - A special study submitted in partial fulfillment of requirements for the Diploma of Asian Institute of Technology, School of Environment, Resources & Development; Special Studies Project Report (M. Eng.) - Asian Institute of Technology, 1984 N2 - The study of a pilot scale slow sand filter using the influent which passed through a coconut hzsk fiber prefilter, with the effluent rate from the slow sand filter of 0.15 m3 /m2 /h can be summarized as follows: The first experimental run: As the effluent from the prefilter was filtered by slow sand filter, it was found that the colour removal was in between 15.9- 28 .1%, turbidity removal 31.5- 42.1%, coliform removal 74-80.5% . During this experimental run, anaerobic condition took place in the process . The second experimental run: The effluent from prefilter was aerated so that the D.O. content was up to 5-6 mg/l before entering the slow sand filter. After passing through the slow sand filter, it was found that colour removal was in between 46.9-49.2% turbidity removal 38 . 2-42.3% and coliform removal 75.7-89.4% while the aerobic condition took place in the process. In this experiment, the degree of pollution of raw water was considerable high with COD of 130 mg/ l. Therefor e , it may be said that the Horizontal coconut husk fiber prefilter tube is unsuitable for high polluted raw water since it may create anaerobic condition in the slow sand filter also. therefore , raw water quality plays a very important role in the application of horizontal coconut husk fiber prefilter tube as the prefilter of the system UR - http://203.159.5.9/ait-thesis/detail.php?q=B20776 ER -