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过氧化钙复合片剂对水体修复和底泥磷控制的作用

本站小编 Free考研考试/2021-12-31

中文关键词过氧化钙复合片剂水体底泥 英文关键词calcium peroxidecompositewater bodysedimentsphosphorus
作者单位E-mail
张帅苏州科技大学环境科学与工程学院, 苏州 215009szhangshuai@126.com
李大鹏苏州科技大学环境科学与工程学院, 苏州 215009ustsldp@163.com
丁玉琴苏州科技大学环境科学与工程学院, 苏州 215009
徐楚天苏州科技大学环境科学与工程学院, 苏州 215009
许鑫澎苏州科技大学环境科学与工程学院, 苏州 215009
孙培荣苏州科技大学环境科学与工程学院, 苏州 215009
赵哲豪苏州科技大学环境科学与工程学院, 苏州 215009
黄勇苏州科技大学环境科学与工程学院, 苏州 215009
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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