Effect of volcanic rock carrier on the removal of nitrogen by Acorus calamus L
The combination of aquatic plant-microorganism to purify water becomes an important means to control nitrogen pollution.However,the role of microbial carriers in it is still unclear.Therefore,the emergent macrophyte Acorus calamus L.was used.And three different groups of microorganism volcanic rock carriers(black,gray and red)were selected to discuss the effect of volcanic rock carrier on the TN removal efficiency of Acorus calamus L.,and the changes of Acorus calamus L.biomass,nitrogen metabolism enzyme activities from root and rhizospheric microbial community diversity were investigated.Result showed that:without planting,the black volcanic rock carrier had the highest TN removal efficiency(40.8％),while with planting,the gray volcanic rock carrier turned out to own the best denitrification effect,with a TN removal efficiency of 70.2％.Compared with no planting,the TN,permanganate index and ammonia nitrogen removal efficiency with gray volcanic rock carrier increased by 32.2,46.9,and 66.6 percentage points,respectively.Gray volcanic rock carrier also promoted the microbial activity in rhizosphere,and Acorus calamus L.growed most vigorously with dominant genus of unclassified_f_Rhodocyclaceae in outlet.Above all,the gray volcanic rock carrier with high SiO2 and low Fe2 O3 contents significantly enhanced the denitrification ability of Acorus calamus L.,which could provide the theoretical and technical support for nitrogen removal in water.
volcanic rock carrierTN removal efficiencyrhizospheric microorganismplant nitrogen metabolism enzymes
万方数据
维普
