Insights into the role of mixing conditions in coagulation-flocculation process: evaluation from performance, flocs formation and density perspectives

2017 ◽  
Vol 95 ◽  
pp. 80-87 ◽  
Author(s):  
Zhaoyang Su ◽  
Xing Li ◽  
Yanling Yang ◽  
Peng Du ◽  
Xiaobo Fang
Keyword(s):  
Process Evaluation ◽  
Mixing Conditions ◽  
Flocculation Process

Metal Ions on the Membrane Bioreactor in the Slow Progress of Membrane Fouling Studies

2014 ◽  
Vol 926-930 ◽  
pp. 158-161
Author(s):  
Wan You Zhang ◽  
Sheng Chao Ji ◽  
Hai Feng Zhang ◽  
Xi Xin Zhang
Keyword(s):  
Metal Ions ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Future Research ◽  
Widespread Application ◽  
Slow Progress ◽  
Flocculation Process

Membrane bioreactor (MBR) has developed rapidly in recent years; however, the membrane fouling problems are affecting its further widespread application. This paper discusses the role of metal ions in the mixture in the mechanism; also on the high-priced metal ions coexist in the mixture when the effects of biological flocculation process; finally, the direction of future research in this area are summarized.

scholarly journals Chemometric Optimisation of a Copper Sulphide Tailings Flocculation Process in the Presence of Clays

Minerals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 582 ◽  
Author(s):  
Claudia Castillo ◽  
Christian F. Ihle ◽  
Ricardo I. Jeldres
Keyword(s):  
Settling Rate ◽  
Mixing Conditions ◽  
Fine Content ◽  
Operational Conditions ◽  
Coarse Aggregates ◽  
Series Of Experiments ◽  
Sulphide Tailings ◽  
Solids Content ◽  
Two Stages ◽  
Flocculation Process

The presence of fine and ultra-fine gangue minerals in flotation plants can contribute to sub-optimal valuable ore recovery and incomplete water recycling from thickeners, with the performance of the latter equipment relying on adequate flocculation. In order to study the dependence of the flocculation process on the suspension-flocculant mixing conditions, a series of experiments—chosen using chemometric analysis—were carried out by varying mixing conditions, solid concentration, water salinity and flocculant dosage. To this purpose, two different tailings (both featuring coarse and fine content) were considered and a response surface methodology based on a Doehlert experimental design was used. The results suggest that the operational conditions to optimise the flocculated tailings settling rate and the suspended solids that report to a thickener overflow are not necessarily the same. This is a reasonable outcome, given that the settling rate depends on the coarse aggregates generated in the slurry, while the overflow solids content is governed both by either fine particle content (and its characteristics) or small aggregates. It is inferred that to maximise dewatering performance two stages should be involved—a separate treatment of the thickener overflow to remove fine content and thickening at optimal flocculant dosage to enhance this process.

scholarly journals ‘There’s Not Going to Be a Single Solution’: The Role of Resettlement Consortia in Improving the Resettlement Outcomes of Young People Leaving Custody

Youth Justice ◽  
2018 ◽  
Vol 18 (1) ◽  
pp. 67-81 ◽  
Author(s):  
Paul Gray ◽  
Hannah Smithson ◽  
Richard McHugh ◽  
Graham Smyth
Keyword(s):  
Young People ◽  
Process Evaluation ◽  
Youth Justice ◽  
Geographically Dispersed ◽  
Single Solution

As part of the government’s Transforming Youth Custody programme, in 2014 the Youth Justice Board (YJB) established four new resettlement consortia in four areas in England. This article presents the findings from a process evaluation of the new consortia, paying particular attention to the enablers and/or barriers that affected the implementation of an enhanced resettlement offer. We found that the consortia did appear to improve partnership working and collaboration between key agencies. Yet the delivery of an enhanced offer was often hampered by the geographically dispersed nature of the consortia, along with problems accessing suitable accommodation upon release.

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