内容 |
論文 |
巻 |
20巻2/3号2015年
|
Page |
19
|
題名 |
流動電流値を指標とした凝集剤注入制御の実用化
|
Title |
Practical Use of Coagulant-dose Control System Adopted Streaming Current Value as Control Index |
著者 |
福田美意1),村山清一1),阿部法光1),黒川 太1),毛受 卓1), 服部 大2),寺崎啓二3),居村研二3) |
Authors |
Mii FUKUDA 1), Seiichi MURAYAMA 1), Norimitsu ABE 1), Futoshi KUROKAWA 1), Takashi MENJU 1), Dai HATTORI 2), Keiji TERASAKI 3) and Kenji IMURA 3) |
著者表記 |
1)(株)東芝電力・社会システム技術開発センター,2)(株)東芝水・環境システム事業部,3)宇和島市水道局 |
著者表記(英) |
1) Plant systems and solutions R&D Dept., Toshiba Corporation Power Systems Company, 2) Division Water & Environmental Systems Div. Water & Environmental Systems Engineering Dept., Toshiba Corporation Community Solutions Company, 3) Uwajima Water Works Bureau |
著者勤務先名 |
|
Office name |
|
著者所属名 |
|
キーワード |
浄水,流動電流値,凝集剤注入制御,フィードバック制御 |
Key Words |
drinking water, streaming current value, coagulant dose control system, feedback control system |
概要 |
ゼータ電位に相関のある流動電流値を指標とする凝集剤注入制御システムの現地試験での検討結果を報告する。濁質と凝集剤の荷電中和点から凝集剤量を決定するため,試験装置の混和槽出口水の流動電流値を0 付近に維持する凝集剤注入制御を行った。流動電流値は水源由来の濁質流入時は負側に推移するが,未反応の凝集剤を含む返送水の流入時は正側に推移するため,返送水流入時は凝集剤必要量が低減することを確認した。本制御を用いると,従来方式である注入率一定制御に比べ15% の凝集剤削減効果を得られる可能性が示唆された。 |
Abstract |
This paper presents the experimental results of a field study for a new coagulant dosage control system using the streaming current value which has correlation with the so called “zeta potential”. The streaming current value corrected by pH and conductivity was adopted as a control index to reduce the effect of the water quality condition and to capture the pure electrical charge between coagulant and turbidity. It has been confirmed that the corrected streaming current can properly captures negatively charged turbidity of water source as a negative value and positively charged turbidity of the return water containing coagulant from the sand filter or the clarifier as a positive value. The coagulant consumption was reduced when the returned water flow into the receiving well. Compared to conventional coagulant injection ratio control, 15 percent of coagulant dose was reduced at the water purification plant where the experiment was conducted. |