Research Article
Multistage A-O Activated Sludge Process for Paraformaldehyde Wastewater Treatment and Microbial Community Structure Analysis
Table 4
Quality index of polyformaldehyde wastewater.
| | | Raw water | Effluent water of iron and carbon microelectrolysis | A1 | A2 | A3 | O1 | Hydrolytic acidification | O2 |
| | HCHO (mg/L) | 638 | 511 | 191 | 9.81 | — | 10.3 | 8.6 | 10.5 | | COD (mg/L) | 4957.2 | 3772.2 | 1006.4 | 920.0 | 654.0 | 303.0 | 283.0 | 276.4 | | pH | 3.5 | 5.0 | 7.0 | 7.2 | 7.5 | 7.5 | 7.5 | 8.0 | | Temperature (°C) | — | — | 35.0 | 36.0 | 35.0 | 35.0 | 36.0 | 31.0 |
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