Huang Haiming, Xiao Dean, Liu Jiahui, Hou Li, Ding Li
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
College of Resource and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, PR China.
Sci Rep. 2015 May 11;5:10183. doi: 10.1038/srep10183.
In the present study, struvite decomposition was performed by air stripping for ammonia release and a novel integrated reactor was designed for the simultaneous removal and recovery of total ammonia-nitrogen (TAN) and total orthophosphate (PT) from swine wastewater by internal struvite recycling. Decomposition of struvite by air stripping was found to be feasible. Without supplementation with additional magnesium and phosphate sources, the removal ratio of TAN from synthetic wastewater was maintained at >80% by recycling of the struvite decomposition product formed under optimal conditions, six times. Continuous operation of the integrated reactor indicated that approximately 91% TAN and 97% PT in the swine wastewater could be removed and recovered by the proposed recycling process with the supplementation of bittern. Economic evaluation of the proposed system showed that struvite precipitation cost can be saved by approximately 54% by adopting the proposed recycling process in comparison with no recycling method.
在本研究中，通过空气吹脱进行鸟粪石分解以释放氨，并设计了一种新型集成反应器，通过内部鸟粪石循环同时去除和回收猪废水中的总氨氮（TAN）和总正磷酸盐（PT）。发现通过空气吹脱分解鸟粪石是可行的。在不补充额外镁源和磷源的情况下，通过在最佳条件下形成的鸟粪石分解产物循环利用六次，合成废水中TAN的去除率保持在>80%。集成反应器的连续运行表明，通过添加卤水的建议循环工艺，猪废水中约91%的TAN和97%的PT可以被去除和回收。对所提出系统的经济评估表明，与不采用循环方法相比，采用所提出的循环工艺可节省约54%的鸟粪石沉淀成本。
