Department of Animal Life System, Kangwon National University, Hyoja 2, 192-1, Chunchon 200-701, South Korea.
J Hazard Mater. 2011 Nov 15;195:175-81. doi: 10.1016/j.jhazmat.2011.08.022. Epub 2011 Aug 12.
Operational parameters such as electric voltage, NaCl, reaction time (RT) and initial struvite amount were optimized for struvite dissolution with a designed electrolysis reactor, and the effect of recycling the dissolved solution on the performance of struvite crystallization was also assessed. The electrolytic reactor was made of plexiglas having titanium plate coated with iridium oxide as anode (surface area: 400 cm(2)) and stainless steel plates as cathodes. For reutilization of dissolved struvite, four runs were conducted with different recycle ratio of the solution. Optimum conditions for the electric voltage, NaCl, RT and initial struvite amount were 7 V, 0.06%, 1.5h and 1.25 g/L, respectively. At the above optimized conditions, 49.17 mg/L phosphate (PO(4)(3-)-P) was dissolved and ammonium-nitrogen (NH(4)-N) got completely removed from the solution. When 0.0, 0.5, 1.0 and 2.0 moles of the dissolved struvite with respect to PO(4)(3-)-P in swine wastewater were recycled along with 0.5M magnesium chloride (MgCl(2)), the PO(4)(3-)-P removal was 63, 69, 71 and 79%, and NH(4)-N was 9, 31, 40 and 53%, respectively. Hence, the performance of struvite formation process was proportionally increased. It is concluded that struvite can be re-dissolved by electrolysis and reused as a source of P and Mg.
操作参数，如电压、NaCl、反应时间（RT）和初始鸟粪石量，均经过优化，以在设计的电解槽中使鸟粪石溶解，并评估了回收溶解溶液对鸟粪石结晶性能的影响。电解槽由有机玻璃制成，其阳极（表面积：400cm²）为涂有氧化铱的钛板，阴极则为不锈钢板。为了再利用溶解的鸟粪石，进行了四次不同溶液回收比的运行。电电压、NaCl、RT 和初始鸟粪石量的最佳条件分别为 7V、0.06%、1.5h 和 1.25g/L。在上述优化条件下，49.17mg/L 的磷酸盐（PO43--P）溶解，溶液中的铵氮（NH4-N）完全去除。当 0.0、0.5、1.0 和 2.0 摩尔与猪废水中的 PO43--P 摩尔比溶解的鸟粪石，以及 0.5M 氯化镁（MgCl2）一起回收时，PO43--P 的去除率分别为 63%、69%、71%和 79%，NH4-N 的去除率分别为 9%、31%、40%和 53%。因此，鸟粪石形成过程的性能成比例增加。结论是，鸟粪石可以通过电解重新溶解并用作 P 和 Mg 的来源。
