| 过氧化钙复合片剂对水体修复和底泥磷控制的作用 |
| 摘要点击 1506 全文点击 677 投稿时间：2019-11-26 修订日期：2019-12-25 |
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| 中文关键词 过氧化钙 复合片剂 水体 底泥 磷 |
| 英文关键词 calcium peroxide composite water body sediments phosphorus |
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| 中文摘要 |
| 以受污染水体及底泥为研究对象，制备了2种过氧化钙复合片剂（CPCTs），并考察了在混合投加方式下对上覆水的影响及控磷效果.复合片剂由过氧化钙（CaO2）、灼烧净水污泥、羟丙基甲基纤维素（HPMC）等粉末直压制成，其中B片剂含硫酸亚铁（FeSO4），A不含.2种片剂吸附效果均较好地符合Langmuir和Freundlich等温模型，对磷的理论最大吸附量分别达110.908 mg·g-1和106.390 mg·g-1.底泥模拟实验结果表明，与对照组相比，A、B组上覆水pH提高，Chl-a浓度降低（42.75%和60.82%），DO浓度提高（53.73%和63.30%）.A、B组上覆水DIP浓度变化均显著，分别降低了54.93%和25.11%.对于底泥间隙水DIP，A、B组Ⅰ层（0~2 cm）变化均显著，分别降低了74.81%和65.66%；B组Ⅱ层（2~4 cm）变化显著，平均浓度降低了46.23%，而A组Ⅱ层变化不显著；A、B组Ⅲ层（4~6 cm）变化不显著.对于底泥形态磷，A、B组NH4Cl-P占TP的比例显著提高（Ⅰ层：16.87%和13.11%；Ⅱ层：12.99%和11.02%），Al-P占TP的比例显著降低（Ⅰ层：7.58%和13.91%；Ⅱ层：9.86%和7.28%），其余形态磷变化不显著.A、B组表层底泥微生物的活性均明显提高，A组较深层底泥微生物活性提高更明显. |
| 英文摘要 |
| Two types of calcium peroxide composite tablets (CPCTs) were prepared, and the inhibition effect on the release of endogenous phosphorus and the influence on the overlying water by mixed-dosing were investigated. The CPCTs were made of calcium peroxide (CaO2), calcined water purification sludge, and hydroxypropyl methylcellulose (HPMC), which were directly pressed into composite tablets, among which Tablet-B (T-B) contained ferrous sulfate (FeSO4) and Tablet-A (T-A) did not. Both the tablets agreed well with the Langmuir and Freundlich isothermal models; the theoretical maximum adsorption capacities of T-A and T-B on phosphorus were 110.908 mg·g-1 and 106.390 mg·g-1, respectively. Compared with the control group, the pH of overlying water was increased, the concentration of Chl-a was decreased by 42.75% and 60.82%, and the DO was increased by 53.73% and 63.30% in group A and B, respectively. The DIP of the overlying water decreased significantly by 54.93% and 25.11% in group A and B, respectively. For the interstitial water in sediment, the DIP in layer Ⅰ (0-2 cm) decreased significantly by 74.81% and 65.66% in group A and B, and the DIP in layer Ⅱ (2-4 cm) decreased significantly by 46.23% in group B, but not obviously in group A. The DIP in layer Ⅲ (4-6 cm) remained unchanged in group A and B. For phosphorus fractions in sediment, the proportion of NH4Cl-P in TP was significantly increased (layer Ⅰ: 16.87% and 13.11%; layer Ⅱ: 12.99% and 11.02%, in group A and B, respectively), and the proportion of Al-P in TP was significantly decreased (layer Ⅰ: 7.58% and 13.91%; layerⅡ: 9.86% and 7.28%, in group A and B, respectively). The other phosphorus fractions did not change significantly. Both T-A and T-B dosing can improve the microbial activity of the surface sediment, though T-A can improve the microbial activity more significantly. |
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