Research On Vertical Flow Constructed Wetland To Treat Raw Water

In this study, we used vertical flow constructed wetlands to light-polluted raw water in progress pretreatment. We have studied the removal efficiency of COD and ammonia, in the light-polluted raw water with different hydraulic and retention time. By constructing a vertical flow constructed wetland test device, select the appropriate plant growth and matrix materials, systems experiment showed that the hydraulic conditions of test device constructed wetlands and detention areas the proportion of water balance data for the evaluation of the system flow conditions, then select Changes in hydraulic loading and hydraulic retention time, the orthogonal test, test equipment obtained for the wetland removal efficiency of COD and ammonia nitrogen, and hydraulic loading and hydraulic retention time of change for the removal ability of the wetland, in addition, also by changing the feed Water concentration, observation of wetland water fluctuation test device to determine the source of wetland water concentration for the inhibitory effect of fluctuations.Experimental studies by analysis of test equipment that the source of wetland COD and ammonia nitrogen removal in water works well, the effluent COD concentration of test equipment is less than6mg/L, ammonia concentration was less than0.5mg/L; when the hydraulic load is small, COD The removal rate increases with the increase in hydraulic loading, the effluent concentration increases with the decrease of hydraulic loading, influent ammonia nitrogen concentration of effluent concentration changes with the increase or decrease, with no obvious relationship between hydraulic loading; When the hydraulic load continues to increase when, COD removal efficiency increased with the decrease of hydraulic loading, the effluent concentration increases with the increase of hydraulic loading, the effluent concentration of ammonia increases with the decrease of hydraulic loading; test system Ability to place pollutants concentrated in the surface20cm range, most of the pollutants are removed within the scope of this paragraph; in the design of pilot hydraulic retention time HRT change, did not cause the ammonia and nitrogen to COD In addition to rates or significant changes in water levels, contaminant removal for HRT is not sensitive to the change; by changing the influent concentration range can be found on the wetland influent concentration fluctuation test device has a good inhibitory effect.