Purifying Waste Water with a Freeze-concentrating and Rarefying Technique, Using Outdoor Coldness(Part 1). Purifying Milking Waste Water.:Purifying Milking Waste Water
スポンサーリンク
概要
- 論文の詳細を見る
This study was carried out to determine the feasibility of purifying milking waste water by using a freeze-concentrating technique that makes use of cold outdoor air. After partially freezing the waste water, the upper layer of ice contains less waste, as the waste is naturally concentrated in the lower unfrozen layer of waste water.In this study, waste water contained in a vessel (70mm in diameter and 210mm deep) was frozen from the top downwards by blowing cold ambient air horizontally across the water surface in a freezing room.The results are summarized as follows:1) As the cold ambient air temperature decreased and the air velocity increased, the freezing rate of the ice layer increased.2) As the freezing rate increased, the COD concentration in the frozen layer increased and the purifying rate (i. e., COD concentration in the waste water/COD concentration of frozen layer) decreased. This is due to the fact that when the freezing rate is too high, the waste is trapped during the ice crystallization process.3) As the ice layer grew in thickness, the COD concentration of the newest ice also increased. As a result the COD concentration within the ice layer varied with the location within the ice layer, such that the concentration was lowest at the ice surface and increased with ice depth.4) Based on the results of this experiment, we were able to develop a predictive equation that relates the COD concentration in the ice layer to the known ambient cold air temperature, the air velocity and the freezing rate.
- 農業施設学会の論文
農業施設学会 | 論文
- 床勾配の異なる2種類のストールにおける乳牛の動作・行動
- 異なる光質環境下におけるトマト苗の発現タンパク質の配置の特徴
- 飢餓環境下におけるトマト苗のタンパク質発現データの配置情報の特徴
- 植物栽培環境スクリーニングのための2次元電気泳動の試み : 光質の異なる環境下におけるペチュニアのタンパク質解析例
- 包装条件の違いがイチゴ果実の損傷に及ぼす影響