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- Title
Return chemical sludge employed in enhancement of phosphate removal from wastewater.
- Authors
Beidou Xi; Ying Zhao; Lie-yu Zhang; Xunfeng Xia; Zhaokun Luan; Xing Peng; Wei Lv
- Abstract
In this study, chemical sludge was recycled by using a coagulation process to improve phosphate removal from wastewater. A pilot experiment was conducted to investigate the appropriate ratio of recycled sludge, the appropriate operating conditions, and the mechanism involved in the enhancement of phosphate removal by return chemical sludge. The results showed that, with sludge recirculation, the process of coagulation for phosphate removal was enhanced by up to 12% compared with no sludge recirculation. Those effects were primarily attributed to the removal of relatively fine particles with a size of 100-310 lm. The sludge settleability was also improved by the addition of chemical sludge, which was mainly attributed to the increase in floc size. The appropriate ratio of recycled sludge was determined to be around 15-20%. Mixing and the aging time of recycled sludge had a significant effect on phosphate removal. Based on these findings, sweep flocculation and/or physical adsorption are expected to play key roles in enhancement of phosphate removal from wastewater.
- Subjects
PHOSPHATE removal (Sewage purification); SEWAGE purification processes; COAGULATION in water purification; ADSORPTION (Chemistry); FLOCCULATION in sewage purification
- Publication
Desalination & Water Treatment, 2014, Vol 52, Issue 34-36, p6639
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2013.816871