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The research on practical application of the resource recovery type processing technology of waste water from electro-less deposition process for the information related parts

信息相关部件无电沉积废水资源化回收型处理技术的实际应用研究

基本信息

批准号：
12558074
负责人：
MURAKAMI Sadaaki
金额：
$ 2.62万
依托单位：
Ube 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

项目摘要

(1)PurposeThe wastewater, from electro-less deposition process, which is widely utilized for the manufacturing of electronics and information related parts such as hard disks and integrated electronic circuits in computers, includes phosphorus compounds, organic substances and ammonia at the very high concentration, besides the heavy metals. After the final treatment for heavy metal recovery, the wastewater had been dumped into ocean. As the sea-disposal had been forbidden since 1995, the residues have been disposed in ground after evaporation to dryness. However, the processing technology of the resource recovery type has not been established.The purpose of this study is the establishment of the processing technology to recover nickel and phosphorus, organic substance and ammonia for the wastewater, and the guideline of design and operation of the processing plant necessary for the commercialization of this technology.(2)ResultsNickel (II) was perfectly recovered by electrolysis process with lead dioxide coat titanium plate as an anode an d titanium plate as a cathode.Hypo-phosphoric acid and phosphorous acid in waste water were perfectly oxidized to ortho-phosphoric acid. The consumed electric power for the process was 580kWh/m^<3-> waste water.100% phosphorus and 90% ammonia were recovered by the MAP(NH_4MgPO_4・ 6H_2O) process. The effective utilization as a fertilizer is possible for the crystalline precipitation of MAP. Optimum addition of Mg(OH)_2 was 160kg for 1m^3 wastewater, and 650kg of MAP was recovered.BOD and ammonia respectively reduced down to 99.8% and 99% by microorganisms in the activated sludge process.The guideline of basic design and operation was made for the actual processing plant.(3)ProspectIn the future research, the demonstration experiment is necessary to be carried out in electrolysis metal-plating factory by cooperating with the private enterprises to commercialize this technology.

(1)目的化学沉积工艺废水被广泛用于制造硬盘、计算机集成电子电路等电子和信息相关部件，除重金属外，废水中还含有磷化合物、有机物和高浓度氨。废水经过重金属回收的最终处理后，已排入海洋。由于自1995年以来海上处置已被禁止，残留物在蒸发至干燥后被处置在地下。但资源回收型的处理工艺尚未建立。本研究的目的是建立回收废水中镍磷、有机物和氨的处理工艺，并为该技术的商业化提供必要的处理厂设计和运行指导。(2)结果以二氧化铅包覆钛板为阳极，钛板为阴极的电解工艺可以很好地回收镍（II）。废水中的次磷酸和磷酸被完全氧化为正磷酸。该工艺的耗电量为580kWh/m^<3->废水。采用MAP（NH_4MgPO_4·6H_2O）工艺回收100%磷和90%氨。MAP结晶沉淀作为肥料的有效利用是可能的。对1m^3的废水，Mg(OH)_2的最佳投加量为160kg， MAP的回收率为650kg。微生物在活性污泥工艺中将BOD和氨氮分别降至99.8%和99%。针对实际加工厂，提出了基本设计和操作的指导方针。(3)展望未来的研究，有必要在电解镀金属厂进行示范实验，与私营企业合作，将该技术商业化。