中文摘要：

在碱性条件下采用水热-共沉淀法,对二价金属化合物CaCl2、MgCl2、ZnCl2与三价金属化合物FeCl3、AlCl3、CoCl3按两两组合方式生成9种不同类型的LDHs,并分别对人工湿地常用的生物陶粒基质进行覆膜改性;构建模拟基质试验柱,对改性前后的生物陶粒基质进行城市污水的脱氮净化效果研究.结果表明,相对于原始生物陶粒基质,大多数改性基质对CODCr、总氮和氨氮的去除效果均有不同程度的提高,经所有基质处理后的出水中硝态氮浓度均呈上升趋势;Zn2＋参与合成的LDHs改性基质对总氮、氨氮有较好的处理效果,其中ZnFe-LDHs和ZnCoLDHs对TN的去除率接近60%,对氨氮的去除率超过92%,这两种改性基质对污水中的氨氮转化为硝态氮具有促进作用.

英文摘要：

Nine kinds of layered double hydroxides（ LDHs） were synthesized with co-precipitated method under alkaline condition using trivalent metal compounds（ FeCl3,AlCl3 and CoCl3） and divalent metal compounds（ CaCl2,MgCl2 and ZnCl2）. Using the modified biological ceramsite substrate coated with different synthesized LDHs,the simulated test columns were constructed to treat the urban sewage. The results showed that,compared with control（ using biological ceramsite as the substrates）,the removal efficiencies of CODCr,total nitrogen and ammonia nitrogen in most simulated test columns using modified biological ceramsite were improved. The modified biological ceramsite synthesized by Zn2＋showed better removal efficiency in total nitrogen and ammonia nitrogen. Especially,when modified biological ceramsite substrates coated with Zn Fe-LDHs and Zn Co-LDHs were used,the average removal efficiencies were close to 60% for total nitrogen and over 92% for ammonia nitrogen,respectively.