On the Removal of Alagl Bloom by Pressure Flotation

压力气浮去除藻华的探讨

• 批准号: 01860031
• 负责人: NAKASONE Hideo
• 金额: $ 2.11万
• 依托单位: Ivaraki University (1990)Maebashi City College of Technology (1989)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01860031/
• 关键词: Algal Bloom; Pressure Flotation; Microcystis; Irrigation Water; 浮上分離; カンガイ用水

Several experiments were conducted at Goryo Numa in Maebashi city in Gumma pref. where algal bloom were remarkable. As the results of these experiments showed that estimation was coincided well with it. However, experimental apparatus (flotation tank) which was used there was slightly large for experiment. Therefore, it took long time to replace the water in the flotation tank. Then it seems to me that some miss calculations might included into the experimental results. To avoid this miss calculation, the writer used small flotation tester. Experiment was conducted again for three kinds of coagulant using this flotation tester. These coagulants were just the same one in which the writer conducted experiments before. These were Al_2(SO_4)_3, PAC, Fe_2Cl_3. The amounts of coagulants used were 5-20mg/1. The water pressure to dissolve air into water was 3.5kgf/cm^2. Then the writer added this pressurized water to the water which contained algal bloom. Then the writer measured flotation velocity in the cylinder whose diameter was 5cm. The floatation velocity was 1.9cm/s at the good conditions. The flotation time of flock from bottom to surface is only 3 minutes when depth of tank is 3m. Consequently, 10 minutes of flotation times is enough to remove algal flock. As the results this experiments the writer thinks that flotation method is most suitable one to remove algae from irrigation water.

在Gumma Pref的Maebashi City的Goryo Numa进行了几项实验。藻华非常出色的地方。由于这些实验的结果表明，估计与之相吻合。但是，用于实验的实验设备（浮选储罐）略有。因此，更换浮选箱中的水花了很长时间。在我看来，实验结果可能会包含一些错过的计算。为了避免这种错过的计算，作者使用了小型浮选测试仪。使用此浮选测试仪再次对三种凝结剂进行了实验。这些凝结剂与作者之前进行实验的凝结剂相同。这些是al_2（so_4）_3，pac，fe_2cl_3。所使用的凝血剂量为5-20mg/1。将空气溶于水的水压为3.5kgf/cm^2。然后，作者将这种加压的水添加到包含藻华的水中。然后，作者测量了直径为5厘米的气缸中的浮选速度。在良好条件下，浮动速度为1.9厘米/s。当水箱深度为3m时，羊群从底部到表面的浮选时间仅为3分钟。因此，10分钟的浮选时间足以去除藻类羊群。作为结果，作者认为，浮选方法最适合从灌溉水中去除藻类。

项目成果

Hideo Nakasone: "ON THE REMOVAL OF ALGAE FROM LAKES AND PONDS FOR IRRIGATION WATER" CONGRESS ON IRRIGATION AND DRAINAGE TRANSACTIONS/ACTES. IーA. 251-261 (1990)

Hideo Nakasone：“关于从湖泊和池塘中去除藻类用于灌溉”灌溉和排水交易/法案 251-261 大会。

中曽根英雄,尾崎益雄: "加圧浮上法によるアオコの除去について" 農業土木学会誌. 56. 41-45 (1988)

Hideo Nakasone、Masuo Ozaki：“压力浮选法去除蓝绿藻”日本农业土木工程学会杂志 56. 41-45 (1988)。

H.NAKASONE: "ON The Removal of Algae from Lakes and Ponds for Irrigation Water" Congress on Irrigation and Drainage,Transactions/ACTES. I-A. 251-261 (1990)

H.NAKASONE：“关于从湖泊和池塘中去除藻类用于灌溉”灌溉和排水大会，交易/ACTES。

HIDEO NAKASONE: "Treatment of Algal Bloom Using Flotation Method" Water. vol 32-5. 21-24 (1990)

HIDEO NAKASONE：“使用浮选法处理藻华”水。

HIDEO NAKASONE: "On The Removal of Algae From Lakes and Ponds for Irrigation Water" Congress on Irrigation and Drainage Transactions/Actes. I-A. 251-261 (1990)

HIDEO NAKASONE：“关于从湖泊和池塘中去除藻类用于灌溉”灌溉和排水交易/法案大会。