Abstract
The effects of polyaluminum chloride (PAC) on settling properties and pollutants removal efficiency were investigated for sludge water collected from sludge thickening and dewatering process of the Bailonggang Wastewater Treatment Plant, and pretreatment effects of PAC, polyferric chloride (PFC), cationic polyacrylamide (cPAM) and anionic polyacrylamide (aPAM) on the sludge water were compared. The results showed that the addition of PAC removed particulate organic matters and dissolved phosphorus; however, the size of formed flocs decreased with the increase of PAC dosage, which resulted in the deterioration of sludge settling characteristics. Therefore, PAC was not suitable for coagulation pretreatment of thickening and dewatering sludge water. Compared to PAC, the addition of PFC, cPAM and aPAM effectively removed particulate pollutants and improved settling properties of sludge water, and cPAM yielded the best pretreatment effect.
| Original language | English |
|---|---|
| Pages (from-to) | 4575-4580 |
| Number of pages | 6 |
| Journal | Chinese Journal of Environmental Engineering |
| Volume | 8 |
| Issue number | 11 |
| State | Published - 5 Nov 2014 |
| Externally published | Yes |
Keywords
- Coagulation
- Pretreatment
- Settling characteristics
- Sludge water