Nitrogen and phosphorus removal for swine wastewater by ammonium crystallization and intermittent aeration process |
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| Authors: | Chung‐Min Liao Takaaki Maekawa Xing‐Dong Feng |
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| Affiliation: | 1. Department of Agricultural Engineering , National Taiwan University , Taipei, Taiwan, 10617, R.O.C.;2. Institute of Agricultural and Forest Engineering , University of Tsukuba , Ibaraki‐Ken, Japan , 305 |
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| Abstract: | Abstract A process on crystallized precipitation of ammonium by adding magnesium salt and phosphate was carried out to improve C/N ratio in swine wastewater. After completion of crystallized precipitation of ammonium, an intermittent aeration process with aeration and non‐aeration periods alternated at interval of 1:1 hr day‐1 is used for the improved swine wastewater (T‐N/BOD=0.14: BOD=8200 mg/liter and T‐N=1166 mg/liter). The results obtained from the experiment show that the removal ratios of T‐N and NH4‐N are 91% and 99%, respectively. T‐P is not removed, while the removal ratio of PO4‐P is 60% as 3% of CaCl2 liquid is added. The results also indicate that dilution with water is effective to improve the removal of phosphorus even if raw swine wastewater contains high concentrations of T‐N, T‐P, BOD, and TOC. |
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| Keywords: | Swine wastewater Intermittent aeration Nitrification/denitrification Ammonia crystallization |
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