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| Effects of different combinations of magnesium(Mg) and phosphorus(P) salts on nitrogen loss during cyanobacteria composting |
| Received:August 11, 2020 |
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| KeyWord:cyanobacteria;aerobic composting;nitrogen loss;struvite crystallization;product quality |
| Author Name | Affiliation | E-mail | | TANG Shang-zhu | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | ZHAO Xiao-hai | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | SI Xin-xin | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | WANG Shun-yong | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | LI Shan-shan | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | ZHANG Xue-sheng | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | | | LI Yu-cheng | School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China | Li-yucheng@163.com |
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| Abstract: |
| In this study, we optimized the control strategy for nitrogen(N) loss during the aerobic composting of cyanobacteria. Corresponding field aerobic composting experiments were conducted, using cyanobacteria as the raw material, mushroom residues and rice hulls as conditioners, and four mixtures of magnesium salts and phosphates[i. e., Mg(OH)2 + H3PO4(MP), Mg(OH)2 + KH2PO4(MKP), MgSO4+H3PO4(MSP), MgSO4+KH2PO4(MSKP)] as additives. The control effects of N loss in different treatments were then evaluated. Compared to the control group, the emission of NH3 in MP, MKP, MSP, and MSKP treatments was reduced by 48.98%, 45.95%, 76.91%, and 38.65%, respectively. Meanwhile, the proportion of total N(TN)increased by 66.31%, 54.42%, 30.15%, and 46.50%, respectively. The fixation rates of N in the four treatments were 44.26%, 41.36%, 71.09%, and 33.54%, respectively. Results of XRD analysis confirmed the presence of struvite(MgNH4PO4·6H2O)in the compost product in all treatments. After 42 days of composting, all the treatments(except the MSP-treated group)reached maturity and met the criterion of NY 525-2012. Although the fixation rate of N in the MKP treatment was slightly lower than that in the MP treatment, the degradation rate of microcystin and total nutrient content in the MKP treatment were both relatively high. Such results indicate that the addition of MKP might be the best method for controlling N loss in cyanobacteria composting. |
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