Browse all Channels
IWA Publishing
Alliance House, 12 Caxton Street ,
London ,
United Kingdom SW1H 0QS
United Kingdom
  1. Companies
  2. IWA Publishing
  3. Articles
  4. Abatement efficiency and controlling strategy of a cylindrical ...

Abatement efficiency and controlling strategy of a cylindrical and a conical fluidized bed flocculator

0
- By: , ,

Courtesy of IWA Publishing

The aggregation efficiency of colloidal kaolin particles by the turbulence caused by random movement of silica gel beads in a cylindrical (CFB) and an 8° conical fluidized bed (TFB) was studied in this paper, focusing on the control strategies of these novel processes. The abatement efficiencies as a function of the Camp number, velocity gradient (G) and flocculation time (T) were exploited. In general, the abatement efficiency tended to be improved with the increase of Camp number (in the study range of this work: Camp number lower than 8058 and 5639 in CFB and TFB, respectively). However, the efficiency was relatively low and sensitive to the Camp number as G was more than 186 s−1 in CFB and 178 s−1 in TFB, respectively. Whereas, increasing flocculation time clearly contributed to the improvement of the abatement efficiency, which is considered to be an effective strategy to enhance the treatment ability. Velocity gradient and flocculation time could be controlled by means of superficial liquid velocity and properties of packing particles. It should be noted that the backmixing in the TFB caused formed flocs to break and thus lower abatement efficiencies were found in the TFB than those in the CFB.

Keywords: Camp number, flocculation, fluidized bed

Related articles

  • United Utilities - Case Study

    Drinking water treatment at Rigdaling WTW Rigdaling water treatment works (WTW) from United Utilities has a daily treated water output of 12 Ml/d. For this WTW, Paques supplied the flocculation/clarification stage comprising ASTRASEPARATOR® lamella packs for the removal of suspended solids and turbidity. Furthermore, Paques supplied the flocculation and ASTRASEPARATOR® clarifiers for wash water recovery.

  • Dow Stade - Case Study

    Energy and space saving solution for TSS removal at chemical company DOW Stade is a chemical company in the north of Germany. Multiple ASTRASEPARATOR® units combined with upstream flocculation tanks pre-treat surface water for the production of process water. The implementation of ASTRASEPARATOR® introduces a compact settling stage instead of a conventional settling tank. The flocculation tanks were designed for hydraulic flocculation. They do not use mixers and thus use less energy than mechanical...

  • Changes in the two-dimensional and perimeter-based fractal dimensions of kaolinite flocs during ...

    In this study, Couette flow experiments were performed to estimate the temporal evolution of the 2D and perimeter-based fractal dimension values of kaolinite flocs during flocculation. The fractal dimensions were calculated based on the projected surface area, perimeter length and length of the longest axis of the flocs as determined by sampling observation and an image-processing system. The 2D fractal dimension, which relates the longest axis length and projected surface area of flocs, was found to decrease...

  • Coagulation and flocculation in the Helsinki drinking water treatment plant

    The raw water for Finland’s capital Helsinki is pumped from Lake Päijänne, located approximately 120 km away, via a tunnel to two water treatment plants, where it is treated and purified. This secures sufficient drinking water of excellent quality for around one million people. In the drinking water treatment plant in Vanhakaupunki 18 HYPERCLASSIC® Evolution7 mixers and three CYBERPITCH® mixers made by INVENT have been in operation since July 2017. The current plant was reconstructed in...

  • Pilot study of oilfield wastewater treatment by micro-flocculation filtration process

    In order to meet the latest Environmental Protection Law of China on wastewater discharge standards, this paper studied a pilot-scale micro-flocculation filtration pretreatment process for the treatment of oilfield wastewater. The experiment showed that the removal rate of oil and suspended solids (SS) respectively increased from 91.52% to 95.38% and from 66.42% to 97.19%. After the treatment by the micro-flocculation filtration device, the relevant characteristics of the discharge wastewater satisfied the latest...

Customer comments

No comments were found for Abatement efficiency and controlling strategy of a cylindrical and a conical fluidized bed flocculator. Be the first to comment!