Softening treatment of leachate from sanitary-landfill by crystallization process

结晶法软化卫生填埋场渗滤液

• 批准号: 02650383
• 负责人: NAKAJIMA Shigeki
• 金额: $ 1.6万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650383/
• 关键词: Crystallization; Softening; Fluidized-bed; Blast furnace slag; 軟化処理; 浸出水; 種晶

(1) Sanitary landfill leachate softening processes have recently gained importance for scaling problem. Calcium carbonate crystallization characteristics were studied by using the apparatus of fluidized-bed type reactor, with the existence of seeds (blast furnace slag). The caustic soda and sodium hydrogen carbonates were used for softening. The concentration of calcium in synthetic leachate was adjusted from 1.2 to 14.1 mol・m^<-3>. The crystallization proceeded rapidly. At the first sampling point, the concentration of calcium was already reduced from its influent value to effluent value. The calcium removal rate reached was 48%-60%. The turbidity of effluent was under 30, and its pH value was 7.3-8.0. The contents of the fluidized-bed are thoroughly mixed. This reaction can be described by the following equation :Co-C=Ko・C・rhetawhere Co : influent of Ca^<2+>[mol・m^<-3>] C : effluent of Ca^<2+>[mol・m^<-3>] rheta : retention time [h] Ko : reaction rate constant[h^<-1>](2) Treatment of landfill leachate using a process for softening such leachate by crystallization was studied. Concentrations of human, organic substance and ammonia in the leachate were lowered after this treatment. Centered pellets and molten slags, prepared from sewage sludge, were utilized as seed to recycle such sludge effectively. Experimental treatments were carried out to determine the crystallization rate, and effects of operating conditions on the reaction rate was discussed. The reaction processes following to second order kinetics. The effect of reaction temperature was negligible.The resulting, the total hardness reaction rate was proportional to 0.6th power of pH value.

(1)卫生填埋场渗滤液的软化处理是近年来研究的热点。采用流化床反应器研究了晶种（高炉矿渣）存在下碳酸钙的结晶特性。苛性钠和碳酸氢钠用于软化。将人工渗滤液中钙的浓度从1.2调整到14.1mol·m^2<-3>。结晶进行得很快。在第一个采样点，钙的浓度已经从其流入值降低到流出值。钙的去除率达到48%~ 60%。出水浊度小于30，pH值为7.3 ~ 8.0。将流化床的内容物充分混合。该反应可用下列方程描述：Co-C=Ko·C·rheta其中Co：Ca^2+进水[mol·m^<-3>] C：Ca^2+出水[mol·m^<-3>] rheta：停留时间[h] Ko：反应速率常数[h^<-1>]（2）研究了结晶法软化垃圾渗滤液的工艺。渗滤液中的人、有机物和氨的浓度经此处理后降低。以城市污泥为原料制备的离心球和熔融渣为种源，有效地实现了城市污泥的资源化。通过实验测定了结晶速率，讨论了操作条件对反应速率的影响。反应过程符合二级动力学。反应温度的影响很小，总硬度反应速率与pH值的0.6次方成正比。

项目成果

Hiroyuki Harada, Hideo Furuta, Izumi Hirasawa, Shigeki Nakajima: "Fundamental Study of High Level Concentration of Calcium by Crystallization in a Fluidized-bed reactor" Haikibutu gakkaishi.

Hiroyuki Harada、Hideo Furuta、Izumi Hirasawa、Shigeki Nakajima：“流化床反应器中通过结晶实现高浓度钙的基础研究”Haikibutu gakkaishi。

原田 浩幸,古田 秀雄,田中 一彦,中島 重旗: "廃棄物最終処分場浸出水の晶析処理の実験的研究(2)" 工業用水.

Hiroyuki Harada、Hideo Furuta、Kazuhiko Tanaka、Shigehata Nakajima：“最终废物处理场渗滤液结晶处理的实验研究（2）”工业用水。

Hiroyuki Harada, Hideo Furuta, Kazuhiko Tanaka, Shigeki Nakajima: "Sotening treatment of leachate from landfill by crystallization process (2)" Kougyou yosui.

Hiroyuki Harada、Hideo Furuta、Kazuhiko Tanaka、Shigeki Nakajima：“通过结晶法对垃圾填埋场渗滤液进行 Sotening 处理（2）” Kougyou yosui。

原田 浩幸,古田 秀雄,平沢 泉,中島 重旗: "ペレット法による高濃度カルシウムの軟化処理に関する基礎的研究" 廃棄物学会誌.

Hiroyuki Harada、Hideo Furuta、Izumi Hirasawa、Shigehata Nakajima：“颗粒法软化处理高浓度钙的基础研究”日本废物管理学会杂志。

原田 浩幸,平沢 泉,中島 重旗: "埋立浸出水の硬度およびCOD成分の晶折処理における結晶成長速度" 化学工学テクニカルレポ-ト. No.20. 38-45 (1990)

Hiroyuki Harada、Izumi Hirasawa、Shigehata Nakajima：“垃圾渗滤液的硬度和COD成分结晶处理中的晶体生长速度”化学工程技术报告第20. 38-45号（1990）。