Construction and operation characteristics of countercurrent-cocurrent dissolved air flotation

WANG Yonglei; LIU Baozhen; ZHANG Kefeng; LI Mei; JIA Ruibao; SONG Wuchang; LI Jun

doi:10.11949/j.issn.0438-1157.20160917

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Construction and operation characteristics of countercurrent-cocurrent dissolved air flotation

更新时间：2025-11-26

- Construction and operation characteristics of countercurrent-cocurrent dissolved air flotation
- CIESC Journal Issue 12, Pages: 5252-5258(2016)
- 作者机构：
  
  1. 山东建筑大学市政与环境工程学院,山东,济南,250100
  2. 山东省绿色建筑协同创新中心,山东,济南,250100
  3. 山东省城市供排水水质监测中心,山东,济南,250021
  4. 北京工业大学建筑工程学院北京市水质科学与水环境恢复工程重点实验室,北京,100124
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20160917
  CLC： U991
- Online First：05 December 2016，
  
  Published：05 December 2016
- 稿件说明：
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WANG Yonglei, LIU Baozhen, ZHANG Kefeng, et al. Construction and operation characteristics of countercurrent-cocurrent dissolved air flotation[J]. CIESC Journal, 2016, (12): 5252-5258.
DOI：

WANG Yonglei, LIU Baozhen, ZHANG Kefeng, et al. Construction and operation characteristics of countercurrent-cocurrent dissolved air flotation[J]. CIESC Journal, 2016, (12): 5252-5258. DOI： 10.11949/j.issn.0438-1157.20160917.

摘要

针对传统溶气气浮（DAF）工艺中气泡对絮体颗粒捕集、黏附效率低，泡絮体黏附不稳定等问题，基于泡絮碰撞黏附理论，研发了集逆向流与同向流于一体的DAF工艺（CCDAF）。该工艺溶气水分两次投加，接触室分为碰撞接触室和黏附接触室。试验结果表明，CCDAF工艺显著提高了泡絮黏附效率和泡絮体稳定性，对浊度、藻类平均去除率达到96.4%、96.50%，出水颗粒物以2~7 μm粒径为主。工艺主要去除大分子、疏水性有机物，CODMn、UV254、DOC平均去除率分别达到37.6%、46.3%和32.11%，CCDAF比同向流及逆向流DAF除污染效能更加显著。泡絮黏附机理分析表明，CCDAF工艺逆向流碰撞区主导作用机制为碰撞黏附及共聚作用，同向流接触区为碰撞黏附及网捕、包卷和架桥作用。

Abstract

Conventional dissolved air flotation(DAF) has the problems of low efficiency for microbubble meshing and particle adhesion

and unstability of the adhesion between microbubbles and particles. In this work

a novel countercurrent-cocurrent dissolved air flotation(CCDAF) was developed

of which the contact room was consisted of collision and adhesion contact room

and each room was introduced dissolved air water. The results showed that the CCDAF significantly enhanced the adhesion efficiency of microbubbles-floc. The average removal efficiency of turbidity and algae were 96.4% and 96.50%

respectively. The diameter of particles for effluent was mainly ranged in 2-7 μm. Most of the removed substance was macromolecules and hydrophobic organic compounds. CODMn

UV254

DOC had achieved 37.6%

46.3% and 32.11%

respectively

indicating the significantly higher removal efficiency of CCDAF than the traditional DAF. The analysis of the removal mechanism between microbubbles and particles showed that the collision

adhesion and copolymerization in countercurrent room and collision

adhesion

wrapped

meshing and adsorption-bridging in cocurrent-contact room were probably the reasons to enhance the removal efficiency of this CCDAF.

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