| Popis: |
Reclaimed water contains lots of contaminants such as nitrogen and phosphorus, which may cause eutrophication of reclaimed water reused as river-lake water. Growing aquatic plants and application of compound microbiological preparations is expected to become a feasible method for purifying reclaimed water in situ. Based on this, a comparison test was taken to studying the water purification ability of reclaimed water by emergent plants, floating plants and compound microbiological preparations with a method of simulation of artificial wetlands. The results show that, Emergent plants in the purifying effect of the nitrogen are better than floating plants, and it also can effectively reduce the pH value of water. The suitable varieties on the purification of recycled water by aquatic plant were chosen, which were emergent plant cattail and floating plant water hyacinth. The purifying effect of nitrite bacteria preparation is the best of all, which is able to increase the number and types of microorganisms in water, and when the applied concentration is 8 ~16g/m3, the purifying effect is the best one. But the pH is generally above 9.5 in water using compound microbiological preparations, which may cause the increase of the alkalinity of water. Therefore, it is advised to prudently use compound microbiological preparations. |
