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Treat ability Study on the Remediation Groundwater Contaminated by TPH Cr6+ : Lab-Scale Experiment

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2019, 28(3), pp.332-345
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Published : June 30, 2019

이규범 1 YOON-YOUNG CHANG 1

1광운대학교

Accredited

ABSTRACT

The purpose of the study is to evaluate the treat ability of contaminated groundwater with TPH and (or) Cr6+ . Laboratory scale tests were performed for oil/water separation, dissolved air flotation (DAF), coagulation and precipitation, and filtration with sand and activated carbon respectively. Two times of oil/water separation tests for total 40 minutes of separation or separating time shows 90.2 % of TPH removal rate. In case of DAF test for high TPH sample, the TPH removal rates were not varied significantly by the variation of microbubble size. However, tests for low TPH samples show that TPH removal rate increases as microbubbles are smaller. When coagulant was added to sample for DAF test, TPH removal rate was increased 12.3 %. SS removal rate by DAF was 97.9 % at 16-40 μm and it was increased as the size of microbubble is reduced. Tests for coagulation and precipitation were performed to evaluate the removal of Cr6+ in groundwater. The increase of FeSO4 dosage increased Cr6+ removal rate in the coagulation and precipitation process. As the amount of activated carbon in the filter media increased TPH removal rate in the filtration process. SS removal rate by the filtration was 96.7 % similar to the results of DAF process tests. The filtration process treats TPH and SS. Best design parameters are determined as the size of sand is 425-850 μm and the ratio of activated carbon and sand is 50:50.

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