Department of Civil and Environmental Engineering, Konkuk University, Neungdong-ro 120, Gwangjin-Gu, Seoul, 05029, Republic of Korea.
Environ Sci Pollut Res Int. 2021 Aug;28(30):40703-40714. doi: 10.1007/s11356-021-12664-9. Epub 2021 Feb 6.
Although the struvite crystallization process has proven to be an effective process for the recovery of nutrients from wastewater, this process has not been widely used due to the excessive use of chemicals. In this study, the optimal production conditions, yield, and economic feasibility of struvite using the anaerobic digestion of livestock wastewater were investigated. In addition, the economic feasibility of adding zeolite to improve the productivity of struvite and additionally remove nitrogen was evaluated. The result of the experiment on the struvite yield change according to the molar ratios at pH 9.0 showed that the struvite yield ratio was 99.0% of the stoichiometric yield at the Mg :NH :PO molar ratios of 1.2:1.0:1.1. As a magnesium source, MgCl, concentrated seawater in the seawater desalination process, and MgO were compared, and when MgO was used, struvite productivity and economic efficiency were the best. Also, while the addition of zeolite greatly increased the struvite production and zeolite was also sold as a soil conditioner, the struvite sales benefit was estimated to be 103% of the operating cost.
尽管鸟粪石结晶过程已被证明是从废水中回收营养物质的有效方法，但由于化学物质的过度使用，该过程尚未得到广泛应用。本研究探讨了利用牲畜废水厌氧消化生产鸟粪石的最佳生产条件、产量和经济可行性。此外，还评估了添加沸石以提高鸟粪石产量并额外去除氮的经济可行性。在 pH 值为 9.0 时，根据摩尔比的鸟粪石产量变化实验表明，在 Mg：NH：PO 的摩尔比为 1.2：1.0：1.1 时，鸟粪石的产率比化学计量产率高 99.0%。作为镁源，比较了 MgCl、海水淡化过程中浓缩的海水和 MgO，当使用 MgO 时，鸟粪石的生产力和经济效益最佳。此外，沸石的添加大大增加了鸟粪石的产量，并且沸石也被用作土壤改良剂，鸟粪石的销售收益估计为运营成本的 103%。
