Pollutants Removal Performance of Modified Constructed Rapid Infiltration System at Low Temperature
Keywords:low temperature, modified constructed rapid infiltration system, pollutants removal, COD, nitrate nitrogen, total nitrogen
AbstractThe conventional Constructed Rapid Infiltration (CRI) system has a low removal rate for total nitrogen, although it has good removal effects on organic pollutants, ammonia nitrogen, suspended solid, etc. To improve the nitrogen removal performance of CRI system, two modified simulated columns were constructed in laboratory. The results in the domestic sewage treatment tests for these two modified systems was compared with conventional system. The system with the addition of an anaerobic saturated water layer only can increase the total nitrogen removal from 22.14% to 32.13% compared with the conventional system, however it contributes little to Chemical Oxygen Demand (COD) removal. Whereas in the system which is added with an anaerobic saturated water layer and extra carbon source entrance at the bottom, the average concentration of COD is decreased to 7.78 mg/l in the effluent wastewater, which is about 21 mg/l less than that of conventional column. The average removal rate of total nitrogen is increased to over 62%, which is almost three times that of the conventional system and two times that of the system with the addition of anaerobic saturated water layer only. Moreover, its average concentration of nitrate nitrogen is significantly decreased in the effluent wastewater. The improved pollutant removal of the system added with anaerobic saturated water layer and extra carbon source entrance resulted from the anaerobic environment, carbon sources and time for nitrate retention which are essential to denitrification.
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