| Related citation: | Ronggang Xu,Yongpeng Xu,Fuyi Cui,Li He,Dong Wang,Qingfeng Su.Impact of Untreated Sedimentation Tank Sludge Water Recycle on Water Quality During Treatment of Low Turbidity Water[J].Journal of Harbin Institute Of Technology(New Series),2015,22(4):79-86.DOI:10.11916/j.issn.1005-9113.2015.04.011. |
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| Author Name | Affiliation | | Ronggang Xu | School of Municipal ＆ Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
Ji′nan Municipal Engineering Design & Research InstituteGroup Co., Ltd, Ji′nan 250101, China | | Yongpeng Xu | School of Municipal ＆ Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
National Engineer Research Center of Urban Water Resources,Harbin 150090, China | | Fuyi Cui | School of Municipal ＆ Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China
National Engineer Research Center of Urban Water Resources,Harbin 150090, China | | Li He | Southwest Municipal Engineering Design ＆ Research Institute of China, Chengdu 610081, China | | Dong Wang | School of Municipal ＆ Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | | Qingfeng Su | China Urban Construction Design & Research Institute Co., Ltd, Beijing 100120, China |
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| Abstract: |
| The overall purpose of this research is to examine the impact of untreated sedimentation tank sludge water (USTSW) recycle on water quality during treatment of low turbidity water in coagulation—sedimentation processes. 950 mL of raw water and different concentrations of 50 mL USTSW are injected into six 1 000 mL beakers without coagulant.The results indicate that USTSW characterized as accumulated suspended solids and organic matter has active ingredients, which possess the equivalent function of coagulant. The optimal blended water turbidity is in the range of 10-20 NTU, within which USTSW recycle achieves the highest save coagulant rate. The mechanism of strengthening coagulation effect when USTSW recycle mainly depends on the chemical effect and physical effect. What is more, through scanning electron microscopy (SEM), it is found that the floc structures with USTSW recycle are more compact than those without USTSW recycle. Besides, the water quality parameters of color, NH3-N, CODMn, UV254, total aluminum, total manganese when USTSW recycle is better than the raw water without recycle, indicating that USTSW recycle can improve water quality with strengthening coagulation effect. |
| Key words: untreated sedimentation tank sludge water recycle low turbidity optimal blended water turbidity water quality |
| DOI：10.11916/j.issn.1005-9113.2015.04.011 |
| Clc Number:TU991.2 |
| Fund: |
