Recovery and removal of ammonia-nitrogen and phosphate from swine wastewater by internal recycling of struvite chlorination product

被引：78
作者：
Huang, Haiming [1 ]
Jiang, Yang [1 ]
Ding, Li [1 ]
机构：
[1] Yanshan Univ, Hebei Key Lab Appl Chem, Sch Environm & Chem Engn, Qinhuangdao 066004, Peoples R China
来源：
BIORESOURCE TECHNOLOGY | 2014年 / 172卷
基金：
中国国家自然科学基金;
关键词：
Ammonia-nitrogen; Phosphate; Struvite; Chlorination; Recycling; ANAEROBIC DIGESTER EFFLUENTS; SOURCE-SEPARATED URINE; LANDFILL LEACHATE; PHOSPHORUS RECOVERY; CHEMICAL PRECIPITATION; MAGNESIUM SOURCES; CRYSTALLIZATION; FERTILIZER;
D O I：
10.1016/j.biortech.2014.09.024
中图分类号：
S2 [农业工程];
学科分类号：
0828 ;
摘要：
The recovery of the total orthophosphate (P-T) 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 P-T recovery efficiency and the struvite purity was mainly depended on the wastewater pH and the Mg:P-T molar ratio. Co-precipitations of Mg-3(PO4)(2), MgKPO4, Ca-3(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 63 mg/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. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：253 / 259
页数：7
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