期刊
CHEMICAL ENGINEERING JOURNAL
卷 254, 期 -, 页码 418-425出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.05.054
关键词
Swine wastewater; Struvite precipitation; Ammonia removal; Seeding crystal
资金
- Natural Science Foundation of Hebei Province [E2014203080]
- Development Program and Research of Science and Technology of Qinghuangdao [201302A226]
- Free Research Foundation for Young Teachers of Yanshan University [13LGB023]
The total ammonia nitrogen (TAN) was removed from swine wastewater using MgO-saponification wastewater as the source of magnesium for struvite precipitation. The experimental results indicated that pH regulators had a significant effect on the extent of struvite precipitation. The effect of pH regulators on the TAN removal ratio was as follows: K2CO3 > KOH > Na2CO3 > NaOH at identical pHs. The corresponding order for the removal of phosphate was KOH > NaOH > K2CO3 > Na2CO3. When struvite crystallization occurred in the presence of ferric ions at 0-500 mg/L concentration, the TAN removal ratio decreased from 89.7% to 82%. Nevertheless, the removal ratio could be remarkably improved by intermittent addition of magnesium source. The pilot-scale experiments revealed that an average of 93% (+/- 3%) TAN removal could be achieved in a continuous-flow reactor by dosing the MgO-saponification wastewater at Mg:N:P ratio of 1.1:1:1 via seeding crystal technique. An economic evaluation showed that the cost for struvite precipitation could be reduced by approximately 12.4% using the combined treatment of swine wastewater and MgO-saponification wastewater as compared with the use of pure magnesium salts. (C) 2014 Elsevier B.V. All rights reserved.
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