Removal Effect of Strengthened Ecological Floating Beds on the Nitrogen and Phosphorus of Urban Sewage
Abstract
In order to explore the strengthened effect of aquatic animal, plant and substrate on nitrogen and phosphorus removal from floating bed and the influence on microbial community, the intensive floating bed was studied for urban sewage is worse than grade V : NH4+-N: 7.50±2.00mg/L, TN: 8.50 ±2.00mg/L, TP: 0.55±0.10 mg/L. Through the experiments, it can be concluded that: in the aspect of nitrogen removal capacity, CSFB group can show obvious advantages of it, and the effluent water quality in summer can reach the grade III; in terms of phosphorus removal, the CSFB phosphorus removal capacity is as high as 83.83%, and the effluent phosphorus concentration 0.11 mg / L in summer, and the phosphorus removal rate of the group containing zeolite was higher than 64%. The removal of nitrogen is mainly based on microbial degradation, followed by the matrix. In terms of the removal of phosphorus, the matrix can significantly increase the removal rate of phosphorus, and the contribution rate of purification of plants and benthic animals is relatively small. Moreover, canna and snails can improve microbial abundance and community diversity. And may affect the abundance of matrix denitrifying bacteria. The denitrifyi ng bacteria enriched in the zeolite floating beds are mostly heterotrophic denitrifying bacteria, among which Acinetobacter, Pseudomonas and Bacillus play a big role in the process of TN removal.
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DOI: https://doi.org/10.18686/pes.v2i1.1310
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