Research on the Pilot Scale Experiment of Tail Water from a Wastewater Treatment Plant Treated by Constructed Wetlands
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Abstract:
The water from a wastewater treatment plant in Tianjin still contains a large number of N and P as well as macromolecules which are hard to be degraded. The constructed wetland system is used to perform advanced treatment on the water from the wastewater treatment plant so that it can meet the standard of urban landscape water use. A pilot experiment is used to simulate the removal efficiency of the constructed wetland system on different kinds of pollutants. The results showed that (1) the wetland system of the inoculated microorganisms has a high removal efficiency of 84.7% on the suspended solids of tail water; (2) removal of suspended solids has a great correlation to matrix adsorption and physical precipitation; (3) the wetland system of the inoculated microorganisms has a good removal efficiency of 44.8% on COD of tail water, , and the addition of functional microbes can improve the removal ability on COD; (4) the wetland system of the inoculated microorganisms does not have a good removal efficiency on ammonia nitrogen and total nitrogen, which is about 12.3% and 35.5% respectively; (5) the addition of dissolved oxygen can contribute to the removal of ammonia nitrogen and total nitrogen; and (6) the wetland system of the inoculated microorganisms has a removal efficiency of 52.3% on total phosphorus, main relying on the matrix adsorption and physical precipitation.
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