Kim Daekeun, Kim Jinhyeong, Ryu Hong-Duck, Lee Sang-Ill
Department of Environmental Engineering, Chungbuk National University, Cheongju, Chungbuk, Republic of Korea.
Bioresour Technol. 2009 Jan;100(1):74-8. doi: 10.1016/j.biortech.2008.05.024. Epub 2008 Jul 2.
The objective of this study was to investigate on the effect of mixing intensity (G) and mixing duration (t(d)) on struvite precipitation in the chemical mechanical polishing (CMP) wastewater generated from the semiconductor manufacturing process. Batch-scale experiments revealed that struvite crystallization was affected by both G and t(d). The mixing effect was to enhance the mass transfer of solute to the crystals in the process, resulting in the improvement of struvite crystallization and growth. By forming struvite, removal efficiencies of N and P increased logarithmic with the multiple values of G and t(d), i.e., Gt(d). Insufficient mixing energy with the Gt(d) value less than 10(5) caused an increase in the formation potential of unexpected precipitate unlike to pure struvite, causing a decrease in removal efficiencies of N and P in the process. At the Gt(d) value over 10(6), struvite precipitation was not restricted by fluoride, of which high level inherently contained in the CMP wastewater. The study results can be taken into consideration in the design and operation of the struvite precipitation process for both nutrient (N and P) removal and recovery.
本研究的目的是调查混合强度（G）和混合持续时间（t(d)）对半导体制造过程中产生的化学机械抛光（CMP）废水鸟粪石沉淀的影响。批次规模实验表明，鸟粪石结晶受G和t(d)两者的影响。混合作用是在该过程中增强溶质向晶体的传质，从而改善鸟粪石的结晶和生长。通过形成鸟粪石，N和P的去除效率随着G和t(d)的乘积值（即Gt(d)）呈对数增加。当Gt(d)值小于10(5)时，混合能量不足会导致形成不同于纯鸟粪石的意外沉淀物的可能性增加，从而导致该过程中N和P的去除效率降低。当Gt(d)值超过10(6)时，鸟粪石沉淀不受CMP废水中固有高含量氟化物的限制。该研究结果可在鸟粪石沉淀工艺的设计和运行中用于考虑营养物（N和P）的去除和回收。
