WANGQian-le,RONGYi,XUYao-yao,et al.Pollutants Removal Characteristics and Microbial Community Composition of Indoor Ecological Seepage Wells in Rural Areas[J].China Water & Wastewater,2024,40(7):36-44.
Pollutants Removal Characteristics and Microbial Community Composition of Indoor Ecological Seepage Wells in Rural Areas
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第7期
Page:
36-44
Column:
Date of publication:
2024-04-01
- Keywords:
- decentralized rural grey water; ecological seepage well; unpowered oxygenation; A/O process
- Abstract:
- This paper designed an unpowered indoor ecological seepage well for effectively removing carbon, nitrogen and phosphorus from grey water, and investigated the pollutant removal characteristics and microbial community composition of the system for treating simulated domestic grey water, so as to solve the problems of decentralized distribution of rural domestic grey water and its difficulty in centralized treatment. The oxygenation performance of the inner uniformly distributed pipe aeration mode became worse in the later period of operation, while the average removal rate of each pollutant under the external dual-riser ventilation mode could be stably maintained at a high level, indicating that the latter was more conducive to the zonal growth of nitrifying bacteria and denitrifying bacteria. The test results of the interaction between the position of aeration layer and the water distribution cycle of the external dual-riser ecological seepage well showed that the best pollutants removal performance of the ecological seepage well was obtained when the aeration layer was in the 5th layer and the water distribution cycle was inflow of 3 min with interval of 9 min. The average effluent COD, NH4+-N, TN and TP were 14.85 mg/L, 0.14 mg/L, 4.67 mg/L and 0.47 mg/L, and the removal rates were 94.11%, 97.91%, 70.45% and 73.92%, respectively. The results of 16S rRNA sequencing showed that the distribution of microbial communities in a stable ecological seepage well was significantly different from top to bottom. The denitrifying and nitrifying bacteria were concentrated in the middle-upper part and the lower part of the ecological seepage well, respectively, and the relative abundance of phosphorus accumulating bacteria was higher in the middle-upper part of the ecological seepage well. Their distribution accounted for the efficient nitrogen and phosphorus removal.
Last Update:
2024-04-01