Improvement on the paiticle sepaiation efficiency through coagulation, sedimentation and filtration which used STI as an index to the treatment

以STI为指标的混凝、沉淀、过滤提高颗粒分离效率

• 批准号: 14550538
• 负责人: EBIE Kunio
• 金额: $ 2.18万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550538/
• 关键词: STI; coagulation-sedimentation; zeta-potential; filtration; G_R value; T_R value; PACl (poly-aluminum chloride); PSI(poly-silicato iron); 急速ろ過; ポリシリカ鉄凝集剤(PSI); 吸引時間比(STIまたはSTR); 急速撹拌強度(G_R値); ゼータ電位; 微フロック径; 凝集沈澱; 吸引時間比(STI値; 急速撹拌強度(GR値)

1)In most cases, only the turbidity has been used as an evaluation index of water treatment. However, the evaluation of the coagulation and sedimentation treatment should be done by adopting the suction time ratio STR (=STI) which has a strong correlation to the residual coagulant quantity. In our research, the usefulness of such method was verified experimentally.2)In the conventional water purification method in which increased coagulant dosing under G_R value of 150 s^<-1> and T_R value of 1min was made, it was demonstrated that when the STR reduction was insufficient, the shortening of filtration time occurred, and the much volume of sludge arose when the high coagulant dosing rate was set.3)In order to reduce both the turbidity and the STR of water treated by the coagulation and sedimentation processes (T_R value is fixed at 5min), it is important to raise G_R values at the optimum value for the coagulant used. When the PAC1 is used as a coagulant, G_R values of 450 s^<-1> and 100 … More 0 s^<-1> were optimum for the reduction of turbidity and STR respectively. On the other hand, When the PSI-3 is used, G_R values of 650 s^<-1> and 1350 s^<-1> were found to be optimum for reducing the turbidity and the STR respectively.4)The following were measured right after the rapid stirring : diameter, circular rate and zeta-potential of the micro flock. As the result, it was confirmed that the diameter of micro flock was decreased and the circular rate was increased, as the G_R value approaches the optimum stirring condition. And, it was verified that the zeta-potential of the micro flock containing much coagulant, and the dense micro flock was formed. It was also shown that such change of the property of micro flock was strongly related to the treatment improvement.5)The direct sand filtration experiments were carried out in order to examine the treatability of the micro flock formed in the conditions in which G_R values and T_R values widely were varied. The results have indicated that the best filtration results on both the filter head loss and the filtered water turbidity were obtained in G_R value of 750 s^<-1> and T_R value of 7min (G_R・T_R value=315,000) where the STR of the raw water right after the rapid stirring became minimum. Less

1)在大多数情况下，只有浊度被用作水处理的评价指标。但对混凝沉淀处理效果的评价应采用抽吸时间比STR(=STI)，它与剩余混凝剂的投加量有很强的相关性。在本研究中，通过实验验证了该方法的有效性。2)在常规净水方法中，在GR值为150时加大投药量的S；结果表明，当STR降幅不足时，过滤时间缩短，当混凝剂投加率较高时，会产生大量的污泥。3)为了降低混凝沉淀处理水的浊度和STR(T_R值固定为5min)，在混凝剂的最佳投加量时，提高GR值是非常重要的。当用PAC_1作混凝剂时，G_R值为450 S和100…。较高的S浓度对浊度的去除效果最好，对STR的影响较小。另一方面，当使用PSI-3时，650GR值的S和1350 S的GR值分别对降低浊度和STR是最佳的。4)在快速搅拌后立即测量了以下各项：微团的直径、圆化率和Zeta电位。结果表明，当GR值接近最佳搅拌条件时，微团的直径减小，环化率增大。并验证了含有较多混凝剂的微团簇的Zeta电位，形成了致密的微团簇。5)为了考察在G_R值和T_R值变化较大的条件下形成的微团的可处理性，进行了直接砂滤实验。结果表明，当GR值为750时，滤池水头损失和出水浊度均达到最佳，TR值为7min(GR值为31.5万)，此时原水在快速搅拌后的STR最小。较少

项目成果

海老江 邦雄: "凝集沈殿の処理制改善に関する基礎的研究-G_R値の上昇による濁度とSTRの低減化-"水道協会雑誌. 71. 11-21 (2002)

Kunio Ebie：“改进絮凝和沉淀处理系统的基础研究 - 通过增加 G_R 值降低浊度和 STR”日本水道协会杂志 71. 11-21 (2002)。

K.Ebie: "Increasing Particle Separation Efficiency in Rapid Sand Filtration Process Through the Use of a Novel Iron-based Coagulant PSI"Proceedings of XIII IWA ASPAC Regional Conference(WATER PHILIPPINES 2003 TECHNICAL PAPERS). 337-344 (2003)

K.Ebie：“通过使用新型铁基混凝剂 PSI 提高快速砂滤过程中的颗粒分离效率”第十三届 IWA ASPAC 区域会议论文集（水务菲律宾 2003 年技术论文）。

海老江 邦雄: "鉄系凝集剤による濁質処理の効率化に関する基礎的研究"水道協会雑誌. 72巻7号. 2-13 (2003)

Kunio Ebie：“使用铁基絮凝剂提高浊度处理效率的基础研究”日本水道协会杂志第 72 卷，第 7. 2-13 期（2003 年）。

海老江 邦雄: "凝集剤注入法によるろ過水濁度の低減化に関する研究-低温・抵濁水の処理適用した場合-"水道協会雑誌. 71. 16-25 (2002)

Kunio Ebie：“通过混凝剂注入法降低滤水浊度的研究-应用于低温浊水处理”日本水道协会杂志71. 16-25 (2002)。

K.Ebie: "Reducing Filter Effluent Turbidity by Injecting Coagulant into Filter Influent -Application to Sand Filtration of Low Temperature and Low Turbidity Influent-"Journal of JWWA. Vol.71, No.11. 16-25 (2002)

K.Ebie：“通过向过滤器进水中注入混凝剂来降低过滤器出水浊度——在低温低浊度进水砂滤中的应用——”JWWA杂志。