Optimizing the industrial wastewater pretreatment by activated carbon and coagulation: Effects of hydrophobicity/hydrophilicity and molecular weights of dissolved organics

Title
Optimizing the industrial wastewater pretreatment by activated carbon and coagulation: Effects of hydrophobicity/hydrophilicity and molecular weights of dissolved organics
Author(s)
정진영하마드칸하동환
Keywords
MEMBRANE FILTRATION; SECONDARY EFFLUENT; ADSORPTION; MATTER; ULTRAFILTRATION; FRACTIONATION; IMPACT; NOM
Issue Date
201302
Publisher
TAYLOR & FRANCIS INC
Citation
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING, v.48, no.5, pp.534 - 542
Abstract
This study addresses industrial wastewater treatment to remove dissolved organic compounds (DOC) using Fenton and coagulation processes, followed by granular activated carbon (GAC), and powdered activated carbon (PAC) as a pretreatment before reverse osmosis (RO). The effects of the hydrophobic / hydrophilic fractions and the molecular weights (MW) of the organics on DOC removal were tested and used to optimize the combination process. The raw wastewater (RWW) had a dominant hydrophobic fraction, as determined by polymeric resins Amberlite XAD-4. High performance liquid chromatography tandem mass spectrometry (HPLC/MS/MS) results showed that MW of organics were 256, 172, 258, 146, 392, 321, 182, 373, 276, 365, 409 and 453 in increasing order of hydrophobicity. GAC had higher adsorption capacity and was more selective for hydrophobic DOC removal than PAC. The removal efficiency of DOC by PAC and GAC was decreased after Fenton treatment, which decreased the hydrophobic fraction. Coagulation with ferric chloride efficiently removed the non-ionic hydrophilic and anionic hydrophilic organics. The coagulant doses selected as a pretreatment before GAC were 2.1 and 15.5mg Fe(III)/mg DOC. The effluent total organic carbon (TOC) trends were correlated with the hydrophobic and hydrophilic fractions by using a rapid small-scale column test (RSSCT) for GAC breakthrough with a scale down factor of 5. GAC preferentially adsorbed the hydrophobic and the cationic hydrophilic organics. The effluent TOC trend could be divided into four stages: maximum adsorption, hydrophobic stage, exhaustion, and biological. The TOC removal after the exhaustion stage was almost equal to the hydrophilic fraction of TOC. Therefore these results demonstrated that the combination of coagulation and GAC adsorption was a highly efficient process for reducing DOC.
URI
http://hdl.handle.net/YU.REPOSITORY/26567http://dx.doi.org/10.1080/10934529.2013.730443
ISSN
1093-4529
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공과대학 > 환경공학과 > Articles
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