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Ecological floating bed as an effective body of water in situ repair technology, without taking up land, no secondary pollution, directly from the water to remove pollutants and low cost, relatively easy operation and management advantages, has been widespread concern. Currently, both at home and abroad has developed a variety of ecological floating bed technology, applied to the dynamic ecological restoration of polluted water of the lakes, reservoirs and other static pollution of water bodies and rivers have good purification effect, but for different craft floating bed The adaptation of the concentration range, and a body of water of different pollutants suitable floating bed process are not clear, the purification efficiency of the different processes of the system compared study also rarely reported. This paper carried out a different craft ecological floating bed of First study of traditional ecological floating bed in different sewage concentration under different plants of pollutants purification effect, then on the basis of design to build a composite ecological floating bed and mobile wetlands floating bed systematic study of its purifying effect, and then compare the purification efficiency of different craft floating bed, and finally from the plants to absorb, root secretion oxygen and microbiological point of view of the preliminary purification mechanism. In this study, the following conclusions: 1, traditional plants floating bed technology contaminated water purification efficiency of the test based on ecological principles and cost requirements, select canna, windmill grass, yellow iris, vetiver, and then force flower, elephant grass and other wetland plants to build plants floating bed, study different concentrations of sewage the purifying effect, the results show: selected wetland plants are capable of higher organic matter and nitrogen and phosphorus concentration wastewater growth, six kinds of plants floating bed of CODCr, TP, TN, NH4-N showed higher removal loading of different plants floating beds the CODcr are better removal effect (p gt; 0.05); force to spend again, Canna, windmill grass, yellow iris floating bed TP removal The load was significantly higher than the elephant grass, and vetiver floating bed (p lt; 0.05); TN, NH4-N removal efficiency to canna yellow iris, and then force flower floating bed best (p lt; 0.05). 2, composite ecological floating bed technology contaminated bodies of water purification efficiency using Canna, of Windmill Grass two kinds of wet ground plants, elastic filler combined packing two kinds of filler type, different plants of different fillers twenty-two combination, construct four kinds of type composite-ecological floating bed , and without plant two kinds of filler floating bed as a control, to carry out the study of different concentrations of sewage treatment effects, the results show better removal effect: six kinds of treatment have CODCr and no significant differences between the different treatment processes ( p gt; 0.05), shows that in CODCr the degradation, plants and micro-organisms also play a role, and the more obvious role of microbial removal; the 6 floating bed have a better deal with the effect of different concentrations of sewage TP, and four kinds plant compound ecological floating bed and TP removal load significantly higher than the non-plant the filler floating bed (p-lt; 0.05), description of the floating bed for phosphorus removal, rely on plants and microorganisms common role, and is absorbed by plants plays an important role; the 6 approach of the different concentrations of sewage, TN, NH4-N also has good processing efficiency, and TP trend also showed four kinds of composite ecological floating bed to remove the load higher than the plant packing group (p lt; 0.05). 3, mobile wetlands floating bed technology of polluted river water purification efficiency to carry out the Pearl River Delta inland river mobile wetlands floating bed of contaminated river water demonstration project, through a period of a year sampling monitoring, results show: Canna, windmill grass, yellow calamus, re-established flower barracuda grass species build mobile wetlands floating bed in the pollution of water bodies can be normal operation, the plant survival rate is more than 95%, and throughout the year to maintain a high growth rate; mobile wetlands floating bed since run since the CODCr removal of load are maintained at the higher range, and demonstration area CODCr concentration significantly decreased (p lt; 0.05) than in the control area, Mobile wetland plants and microorganisms on the packing in which played an important role also showed that in addition to the floating bed plants absorption, adsorption; during operation of the floating bed the demonstration zones TP, TN, NH4-N removal also maintained good results, showing a significant difference (p lt; 0.05) compared to the control area role, fillers microorganisms also have a significant role in this. 4 different craft ecological floating bed of purifying effect of different craft ecological floating bed purifying effect comparison results show that, three kinds of different types of ecological floating bed of CODcr are good to remove the effect of which compound ecological floating bed and mobile wetlands floating bed purification is better than in traditional plants floating bed (p lt; 0.05); treatment of TP, TN, NH4-N and other nutrients, plants floating bed purifying effect significantly greater than the plant filler (p lt; 0.01). 5, both ecological floating bed purification mechanism floating bed plants (canna, windmill grass) roots secrete oxygen and TN removal was highly significant positive correlation (p lt; 0.01), NH4-N was significantly positive correlation (p lt; 0.05), the porosity of the plant and NH4-N CODcr removal rate was a significant positive correlation (p lt; 0.05); floating bed system ammonifiers, the abundance of nitrifying bacteria, nitrification bacteria, denitrifying bacteria closely related to each pollutant removal performance ammonifiers nitrifying bacteria abundance degree and TN, NH4-N removal load was significantly positively related (p lt; 0.05) and highly significantly related (p lt; 0.01), the number of nitrifying bacteria and CODcr removal load was a significant positive correlation (p lt; 0.05); nitrosated number of bacteria and the TN removal of load correlation highly significant (p lt; 0.01), and NH4-N , CODCr removal load was a significant positive correlation (p lt; 0.05). The summary results show that, three kinds of different craft ecological floating bed CODCr, TP, TN, NH4-N and other pollutant removal effect, the effect of compound ecological floating bed best mobile wetlands floating bed and traditional plant ecological floating bed.
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