石莼和海马齿对海水养殖水体的单一及协同净化效果

Single and synergistic effects of Ulva lactuca and Sesuvium portulacastrum on the purification of mariculture wastewater

为探究水生植物对海水养殖水体的净化作用以及不同水生植物之间的协同净化效果,本研究开展了石莼单一处理、海马齿单一处理以及海马齿与石莼协同处理海水养殖水体实验。结果表明:不同种植密度的石莼均可显著改善水质,其中2.0 g·L^(-1)的种植密度最为合适,处理12 d后,对COD、无机磷、铵氮和总氮的去除率分别达到41.7%、76.9%、81.8%和67.2%;不同种植密度的海马齿同样显著改善水质,其中4.8 g·L^(-1)的种植密度最为合适,在处理12 d后,对COD、无机磷、铵氮和总氮的去除率分别达到49.0%、20.8%、98.5%和55.9%;海马齿与石莼协同处理对COD、无机磷、铵氮和总氮的去除率分别达到了36.7%、100.0%、100.0%和88.8%,表明不同类型水生植物混合种植能够有效提高其对养殖水体的净化能力。本研究表明,石莼及海马齿均能改善养殖水体水质,且适当的密度与合理的搭配能够有效促进植物修复效果。

We evaluated the single and synergistic effects of Ulva lactuca and Sesuvium portulacastrum on the purification of mariculture wastewater. The results showed that the water quality was significantly improved by U. lactuca with different planting densities after 12 days treatment.The treatment with a density of 2.0 g·L^-1 showed the highest removal rates of COD,inorganic phosphorus,ammonium nitrogen and total nitrogen,with values being 41. 7% 76. 9%,81. 8%,and 67.2%,respectively. Similarly,S. portulacastrum with different planting densities also significantly improved water quality after 12 days treatment. The planting density of 4.8 g·L^-1 had the highest removal rates of COD,inorganic phosphorus,ammonium nitrogen and total nitrogen,which were 49. 0% 20. 8%,98. 5%,and 55. 9%,respectively. In the treatment with combined U. lactuca and S. portulacastrum,the removal rates of COD,inorganic phosphorus,ammonium nitrogen and total nitrogen reached 36.7%,100%,100.0%,and 88.8% respectively,indicating that their combination enhanced the purification ability. Our results suggest that both U. lactuca and S. portulacastrum can improve water quality,and appropriate planting density and suitable combination of plant species would promote the phytoremediation effects.