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Water, Air, & Soil Pollution

, 229:382 | Cite as

Coagulation Behavior and Floc Properties of Dosing Different Alkaline Neutralizers into the Fenton Oxidation Effluent

  • Min Xu
  • Changyong WuEmail author
  • Yanan Li
  • Yuexi ZhouEmail author
  • Hao Xue
  • Yin Yu
Article
  • 87 Downloads

Abstract

Neutralization is the necessary operation to ensure the Fenton effluent pH. In situ coagulation can be induced during neutralization. In this study, three types of alkaline neutralizers (Ca(OH)2, NaOH, and Ca(OH)2 + NaOH) were added into the Fenton oxidized PSE to control the effluent pH of 6 to 9. The coagulation behavior, floc structure, and properties were investigated. The results indicated that the coagulation with the adding of three neutralizers can remove 9.68 to 24.02% of the TOC. Ca(OH)2 exhibited the highest TOC removal efficiency at the dosage of 0.4 g/L. Charge neutralization ability was in the following order: Ca(OH)2 > Ca(OH)2 + NaOH > NaOH. Ca(OH)2 and Ca(OH)2 + NaOH showed the increase of floc growth rate with the increase of agent dosage, especially for Ca(OH)2 + NaOH. Moreover, Df of NaOH flocs was higher than that of Ca(OH)2 and Ca(OH)2 + NaOH, indicating the floc formed by NaOH was more compact than that of Ca(OH)2. The main coagulation process of three neutralizers was different, and it was also affected by the agent dosage (or pH). When the dosage was 0.35 g/L (pH 6–7.5), the complexation, adsorption, and bridging were the predominant processes while charge neutralization gradually became the main coagulation process for Ca(OH)2 and Ca(OH)2 + NaOH with the increase of dosage (pH 7.5–9).

Keywords

Alkaline neutralizer Dosage Coagulation behavior Floc properties Fenton oxidation effluent 

Abbreviations

A/O

Anoxic/oxic process

AOPs

Advanced oxidation process

Ca(OH)2

Calcium hydroxide

COD

Chemical oxygen demand

d50

The median volumetric diameter

DF

Fractal dimension

DOC

Dissolved organic carbon

DOM

Dissolved organic matters

Fe(OH)3

Ferric hydroxide

FT-IR

Infrared spectroscopy

HNO3

Nitric acid

H2O2

Hydrogen peroxide

HO·

Hydroxyl radicals

IPP

Image pro plus

KBr

Potassium bromide

NaOH

Sodium hydroxide

PSE

Petrochemical secondary effluent

PCWWTP

Petrochemical wastewater treatment plant

RSM

Response surface methodology

SEM

Scanning electron microscopy

SS

Suspended solids

TEM

Transmission electron microscopy

TOC

Total organic carbon

W

Weight

XRD

X-ray diffractometer

Notes

Funding Information

The work is financially supported by the China special S&T project on treatment and control of water pollution (2017ZX07402002).

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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Environmental Criteria and Risk AssessmentChinese Research Academy of Environmental SciencesBeijingChina
  2. 2.College of Water ScienceBeijing Normal UniversityBeijingChina
  3. 3.Research Center of Water Pollution Control TechnologyChinese Research Academy of Environment SciencesBeijingChina
  4. 4.School of Marine Science and Technology and EnvironmentDalian Ocean UniversityDalianChina

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