Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China.
Bioresour Technol. 2014 Nov;172:253-259. doi: 10.1016/j.biortech.2014.09.024. Epub 2014 Sep 16.
The recovery of the total orthophosphate (PT) and removal of the total ammonia-nitrogen (TAN) from swine wastewater were investigated through a combined technology of using bittern as the magnesium source in struvite precipitation along with internal recycling of the chlorination product of the recovered struvite. Results revealed that the PT recovery efficiency and the struvite purity was mainly depended on the wastewater pH and the Mg:PT molar ratio. Co-precipitations of Mg3(PO4)2, MgKPO4, Ca3(PO4)2, and Mg(OH)2 (pH>9) were confirmed to be responsible for the decrease in the purity of struvite. The decomposition of recovered struvite by sodium hypochlorite (NaClO) was feasible. The TAN concentration of the swine wastewater was decreased to 63mg/L by internal recycling of the chlorination decomposition product for seven cycles. An economic evaluation showed that 37% of the treatment cost of the proposed process could be saved as compared with struvite precipitation using pure chemicals.
通过利用盐卤作为鸟粪石沉淀中的镁源，并对回收的鸟粪石的氯化产物进行内部循环的组合技术，研究了从猪废水中回收总正磷酸盐（PT）和去除总氨氮（TAN）。结果表明，PT 的回收效率和鸟粪石的纯度主要取决于废水的 pH 值和 Mg:PT 摩尔比。证实了 Mg3(PO4)2、MgKPO4、Ca3(PO4)2 和 Mg(OH)2（pH>9）的共沉淀是导致鸟粪石纯度下降的原因。次氯酸钠（NaClO）对回收的鸟粪石的分解是可行的。通过内部循环氯化分解产物，猪废水中的 TAN 浓度在 7 个循环内降低至 63mg/L。经济评估表明，与使用纯化学品进行鸟粪石沉淀相比，该工艺的处理成本可节省 37%。
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