Study On Removal Ability Of Root System Of Wetland Plants In Hydroponics To Organics And Ammonia

The ecological system of constructed wetland because of its unique advantages in waste water treatment has been widely used, the ecological system constructed by the plant can effectively remove organic pollutants and ammonia, the root of wetland plant plays an important role in the process of removal of pollutants because it can excrete oxygen, but the current domestic for this part of the oxidative capacity is still a lack of quantitative research, especially the key feature of the pollutant oxidation rate and plant?root biomass, photosynthesis rate, etc.? between is not clear, it is difficult for the specific pollution control engineering design parameter of mature.In this study, the role of wetland plants in the process of sewage purification, the study of the quantitative relationship between plant root and organic matter, ammonia nitrogen degradation and transformation, to explore the effect of plant root system on the actual sewage treatment. Reference wetland plant rhizosphere environment presents the characteristics of oxidation, select a large roots of typical wetland plant- Typha latifolia;through the root artificially intensified induction and amplification, construct different root coverage of hydroponic wetland plant root system and the carry out organic compounds,ammonia nitrogen pollution factor removal ability of quantitative research, obtain the removal rate of the characterization parameters, based on construct fixed iron membrane type hydroponic plant root processing system, small-scale sewage discharged into rivers and lakes.The main results of this study were as follows:?1? Under the condition of hydroponic culture in climatron, the effect of rooting powder and low phosphorus liquid induced to amplification cattail root is identical.The suitable concentration of rooting powder is 100 150 mg / L. Using rooting powder can not only damaged rejuvenation of Typha, also can amplify cattail roots, and it's more simpleand convenient than low phosphorus induced liquid.?2? In the period of time in which the organic matter and the dissolved oxygen concentration decreased fastest, the system of root coverage for 50%, 70%, 90% of COD per unit area load average removal rate respectively 8.28g/m2/d, 8.78g/m2/d, 9.28g/m2/d.The average removal rate of the system to the area of COD was 12.53g/m2/d, 13.18g/m2/d and 13.46g/m2/d after the system with less volume was added. Expansion of plant root volume and the addition of artificial fillers can improve the removal efficiency of organic matter, the system to increase the same volume of root removal of organic matter is better than the filler.?3? The system of root coverage for 50%, 70%, 90% of NH₄⁺-N per unit area load average removal rate respectively 0.20g/m2/d ? 0.25g/m2/d ? 0.37g/m2/d. The average removal rate of the system to the area of NH₄⁺-N. was 0.29g/m2/d?0.29g/m2/d?0.46g/m2/d after the system with less volume was added. Expansion of plant root volume and the addition of artificial fillers can improve the removal efficiency of NH₄⁺-N, the system to increase the same volume of root removal of organic matter is better than the filler.?4? Amplification of the root and the addition of filler, are conducive to the growth of microorganisms in the system, but in the case of the same volume, the total number of bacteria attached to the root system than the filler surface, ammonia oxidizing bacteria.Adding fillers to strengthen the effect of removal of COD is better than the removal of NH₄⁺-N.?5? Under hydroponic conditions, Typha latifolia root system application in real urban wastewater treatment, due to the influence factors of temperature, microorganism,wastewater components, dissolved oxygen, overall removal effect is lower than that of artificial wetland. Root surface iron induced membrane although conducive to enhance the removal rate of the pollutants, but for large-scale iron plaque induction technology is still not mature, iron membrane attachment instability, induced process is easily affected by natural environment problems due to increased engineering application of technology,economy and management cost, widely used in certain difficulties exist.