Development of Resource Recovery System for Phosphate and Fluoride Using Waste form Marine Industries

利用海洋工业废弃物进行磷酸盐和氟化物资源回收系统的开发

基本信息

批准号：
12558073
负责人：
IWAI Masao
金额：
$ 4.16万
依托单位：
Toyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12558073/
关键词：
Phosphate Fluoride Apatite Waste from Marine Industries Calcium Phosphate Resource Recovery 資源化

项目摘要

(1) Recovery of phosphate : The kinetics of the oxidation of phosphorous acid solution with oxygen in the presence of Cu (II) was studied. The achievement of oxidation above 90% is readily done at 373K, 3 atm, pH 3, [Cu (II)] 1.0Χ10^<-3>moldm^<-3> during the retention time of 200 minutes. It was considered that autoxidation reaction may be applicable to the recovery of phosphate in spent electroless plating liquors.(2) Fluoride removal from industrial wastewater : It is found that CO_2 in the atmosphere interferes with fluoride removal efficiency and produces a large amount of sludge by forming calcium carbonate. In order to confirm these phenomena, experiments using real wastewater under normal and degassed conditions were carried out not only by measuring the fluoride concentration in the wastewater, but also by characterizing the properties of the formed sludge. As a result, the calcium fluoride method under degassed conditions is suggested to be a very promising method for treatment of wastewater containing fluoride from the viewpoint of minimum emission.(3) Development of fluoride recovery system : A novel system of fluoride removal from wastewater was assessed from the viewpoint of "Ecotechnology". The equipment with activated alumina in a column can remove fluoride without increment of any chemical components in treated water. However, this system must be regenerated after activated alumina saturating, in order to minimize the emission derived from it. Then, we proposed an ecotechnological fluoride treatment system, which is composed to combine the adsorption and co-precipitation with aluminum hydroxide, and fluoride was removed as calcium fluoride from the system. As a result, the system is suggested to be very promising because of it's possibility of energy saving and resources saving.

(1) 磷酸盐的回收：研究了在 Cu (II) 存在下亚磷酸溶液与氧气的氧化动力学，在 373K、3 atm、pH 3 下很容易实现 90% 以上的氧化，[Cu]。 (II)]在200分钟的保留时间期间1.0×10^-3m^-3 认为可能是自氧化反应。适用于化学镀废液中磷酸盐的回收。(2)工业废水除氟：发现大气中的CO_2会干扰除氟效率，并通过形成碳酸钙产生大量污泥来证实。对于这些现象，我们使用正常和脱气条件下的真实废水进行了实验，不仅测量了废水中的氟化物浓度，而且还表征了形成的污泥的性质。从最小排放的角度来看，脱气条件下的氟化钙法被认为是一种非常有前景的含氟废水处理方法。 (3) 氟化物回收系统的开发：从以下角度评估了一种新型的废水除氟系统：塔内装有活性氧化铝的设备可以在不增加处理水中任何化学成分的情况下去除氟化物，但该系统必须在活性氧化铝饱和后进行再生。然后，我们提出了一种生态技术氟化物处理系统，该系统将吸附和与氢氧化铝共沉淀相结合，氟化物以氟化钙的形式从系统中去除。由于它可以节省能源和资源，因此被认为是非常有前途的。