过氧化钙复合片剂对水体修复和底泥磷控制的作用  

Effect of Calcium Peroxide Composite Tablets on Water Remediation and Phosphorus Control in Sediment

作　　者：张帅 李大鹏[1] 丁玉琴 徐楚天 许鑫澎 孙培荣 赵哲豪 黄勇[1] ZHANG Shuai;LI Da-peng;DING Yu-qin;XU Chu-tian;XU Xin-peng;SUN Pei-rong;ZHAO Zhe-hao;HUANG Yong(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009

出　　处：《环境科学》2020年第6期2706-2713,共8页Environmental Science

基　　金：国家自然科学基金项目(51778393);江苏省研究生实践创新计划项目(SJCX18_0870)。

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.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 layerⅠ(0-2 cm)decreased significantly by 74.81%and 65.66%in group A and B,and the DIP in layerⅡ(2-4 cm)decreased significantly by 46.23%in group B,but not obviously in group A.The DIP in layerⅢ(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(layerⅠ:16.87%and 13.11%;layerⅡ:12.99%and 11.02%,in group A and B,respectively),and the proportion of Al-P in TP was significantly decreased(layerⅠ: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.

关 键 词：过氧化钙 复合片剂 水体 底泥 磷 

分 类 号：X52[环境科学与工程—环境工程]