安定型産廃処分場排出水の水質について [in Japanese] Effluent Water Quality of a Stable-type Waste Disposal Site [in Japanese]
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新潟県長岡市宮本町にある安定型産廃処分場 (計画処分量157万m<SUP>3</SUP>) の排出水水質19指標と底質重金属7種の調査を92年7月～93年11月に行った。その結果, 排出水はBODが環境基準健康項目類型Eを越え, 全窒素など5項目で農業用水水質基準を越えた。同定された揮発性有機塩素化合物量はTOXの1%に満たず, TOX成分の大半は不揮発性と考えられた。生分解度は, 試験開始時のCOD (Cr) の約3割に留まった。排出水のマイクロトックス毒性は, 無濃縮の試料では認められなかったが, pH2に調整後, 1, 000倍濃縮した試料で顕著に認められた。変異原性は, 試料をpH2に調整後濃縮し, 菌株TA100, S9mix添加の場合にのみ検出された。底質の重金属量は対照値より高かったが, Mn等は経時的に増加傾向を示し, Cr等は減少傾向を示した。調査期間を通じ, 排出水の濃度, 負荷量ともに漸減の傾向にあった。
In order to elucidate environmental effects of a stable-type disposal site for industrial wastes, the effluent water quality of Miyamoto disposal site in Niigata Prefecture was studied from July, 1992 to November, 1993. As a result, amounts of electroconductivity, permanganate value and total nitrogen exceeded the criteria for agricultural water. The TOX concentration was much higher than the control. Most of the TOX was found to consist of non-volatile compounds. The biodegradability of effluent reached only 30% of the initial COD (Cr) of effluent. Microtox-toxicity was also found in the effluent only when samples were concentrated under pH2 condition. Mutagenicity was also found only when sample concentration was carried out under pH2, TA 100 strain was used and S9 mix was added. Pollution loads per day of BOD, Permanganate value and total nitrogen in the effluent were equal to those produced by 943, 5600 and 2950 persons per day, respectively, which were amounts that were equal to or more than the number of Miyamoto Town residents. The amounts of seven metals in sediments were much higher than the control. Though both concentration and load of effluent decreased gradually with time during the above-mentioned study period, more careful watching will be needed.
- Journal of the Japan Society of Material Cycles and Waste Management
Journal of the Japan Society of Material Cycles and Waste Management 7(3), 113-122, 1996-05-31
Japan Society of Material Cycles and Waste Management