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Outline
The aim of this study was to investigate the performance of calcination-modified Drinking Water Treatment Residual (DWTR) in removing typical pollutants in stormwater. The results showed that the aluminium contents of DWTR were as high as 14g/kg, which were significantly higher than that of general soil, and the XRD pattern showed higher alumina peaks, and the calcination modification could further improve the specific surface area and surface characteristics of the sludge; the isothermal adsorption characteristics of DWTR for the typical stormwater pollutants of phosphate, ammonia, nitrogen, and lead ions were better fitted to both Langmuir and Freundlich model, and the results of kinetic experiments showed that the adsorption process was more in line with the quasi-secondary kinetic model, indicating that the adsorption process was dominated by chemical adsorption and accompanied by physical adsorption, and the adsorption performance of calcined modified sludge was generally better than that of air-dried and screened sludge only, and the morphology analysis showed that more adsorbed lead could exist in the relatively stable carbonate-bound state of lead; The adsorption performance of soil columns based on the substrate of sludge from a water purification plant for typical The soil columns based on the water purification plant sludge matrix could remove 100%, 98%, 86.94% and 85% of the typical rainwater pollutants (orthophosphate, lead ion, ammonia nitrogen, COD), and 59% to 78% of the natural rainfall and rooftop rainfall in Beijing with a COD of 65~85mg/L, and the effluent could meet the environmental quality standard of 30mg/L for surface water IV, which indicated that both air-dried sieved and calcined modified sludge have the potential to be used for the treatment of water purification plant sludge. This indicates that both air-dried and calcined water purification plant sludge have the potential to be used as urban artificial wetland substrate for soil replacement and rainwater purification.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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