信州大学農学部排水の処理について-1-排水の水質と処理の根本方針
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概要
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In order to establish the fundamental plan for the technical treatment of the sewage in the Faculty of Agriculture, Shinshu University, analyses and several tests of the sewage were performed, while solution containing hazardous compounds, oils, fats and organic solvents were collected in tanks before they were poured off into sinks. These results lead to the following views: 1) If hazardous compounds are thoroughly collected, the sewage sufficiently passes the effluent standard. 2) The quality of the sewage is much improved by aeration and stirring. 3) The present systems of the arrangement of the drainadge channels prevent the technical treatment of the sewage, when there is much rainfall, because of increase in the quantity of water and inflow of muds and sands. On the basis of the views described above, the following sorts of provision are considered as appropriate, for the plan of the drainadge in our campus. 1) Solution containing hazardous compounds, oils, fats and organic solvents will have to be collected in future. 2) The drainadge channels must be separated into three systems; the drainadge, of rain water, from laboratories and of sewage from houses and toilets. 3) A new institute must be constructed for the treatment of BOD in the sewage from houses and toilets. 4) The drainadge from laboratories must be led to the present settling tank and then, mixed with the sewage from houses and toilets. The whole must be treated in the way described in 3). 5) Rain water must be led to a settling tank to separate muds, sands and other materials, and mixed with an effluent treated by aeration. 6) Solution containing hazardous compounds collected in tanks must be treated in the respective manners corresponding to materials.
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