Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Physical Effect on Synthesis of Al(III) Polymeric Inorganic Coagulants for Water Treatment

수처리용 Al(III)계 무기고분자응집제 제조시 물리적 영향

Han, Seung-Woo;Lee, Chul-Woo;Kang, Lim-Seok
한승우;이철우;강임석

  • Published : 2004.10.31
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Abstract

This research explored the feasibility of preparing preformed PACl (polyaluminum chloride) as coagulants for water treatment at optimum synthesized condition. The optimum synthesized condition of PACls was that the G value and temperature were $114\;sec^{-1}\;and\;50^{\circ}C$, respectively. The differentiation and quantification of hydrolytic Al species in coagulant were done by spectrophotometric method based on the interaction of Al with Ferron as a complexing agent. In addition, $^{207}Al-NMR$ and FT-IR were used to characterize the nature and structure of the hydrolytic species in the synthesized coagulants. The properties of the synthesized polyaluminum chloride (PACl) showed that the quantities of polymeric Al produced at a value of $r\;(=OH_{added}/Al_T))$ at 2.2 exhibited a maxima at 85% of the total aluminum in solution. The synthesized PACl was stable during storing period indicating the aging effect is negligible.

Al(III)계 무기고분자 응집제(PACl: Polyaluminum chloride) 제조에 있어서 혼합과 온도의 물리적 영향에 따라 제조한 PACl 응집제의 특성을 연구한 결과, 다음과 같은 몇 가지의 결론을 도출할 수 있었다. 염기도에 따라 제조된 PACl 집제의 특성을 연구한 결과, 다음과 같은 몇 가지의 결론을 도출할 수 있었다. 염기도에 따라 제조된 PACl 응집제의 ferron 분석결과 $r(OH_{added}/Al)$=2.2에서 85% 이상의 가장 많은 polymeric Al(III)종을 함유하고 있는 것으로 나타났다. r=2.2의 PACl에 대한 혼합 및 온도에 따른 제조에 있어서 혼합에 따른 속도경사 값이 $114\;sec^{-1}$과 제조 온도 $50^{\circ}C$의 경우에서 polymeric Al(III)종이 85% 이상으로 가장 많이 함유되어 있는 것으로 나타났다. 그리고 도출된 최적의 제조조건에 따른 PACl 특성 실험에서 ferron 방법 및 $^{27}Al-NMR$ 분석결과 polymeric Al(III)종의 함유정도는 서로 비슷한 결과를 보였으며, FT-IR의 분석결과 연속적인 Al-OH의 결합이 이루어지는 것으로 나타났다. 그리고 제조된 Al(III)계 무기고분자의 사용에 있어서 보관기간에 따른 Al(III)종 변화를 관찰한 결과, 보관기간 동안의 Al(III)종 변화에 따른 영향은 없는 것으로 나타났다.

Keywords

References

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