Design and construction of pilot sludge drying package for the excess sludge in petrochemical industries: Heavy metals determination in sludge by polarography and atomic absorption spectrometry

Volume 6, Issue 04, Pages 52-64, Dec 2023 *** Field: Analytical Environmental Chemistry

  • Mostafa Hassani, Corresponding Author, Ph.D. in Analytical Chemistry, Department of Applied Chemistry, Faculty of Science, Islamic Azad University, South Tehran Branch, Tehran, Iran Member of the Research Council of Sablan Petrochemical Industries Company, Assaluyeh. Iran
  • Bahareh Azemi Motlagh Master of Environmental Management, Faculty of Natural Resource and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran
DOI: https://doi.org/10.24200/amecj.v6.i04.315
Keywords: Sludge, Bed design, Wastewater, Heavy metals, Flame and Hydride generation atomic absorption spectrometry, Polarography

Abstract

In this research, according to the high amount of sludge in a petrochemical company, an iron package type of drying sludge bed was made/designed with carbon steel. Then, the drying sludge pond was filled with layers of sand with different mesh sizes. The excess sludge from the sedimentation pond was passed over this bed, and the amount of sludge removed by the bed was obtained at %96. The values of heavy metal and microbial forms were determined using the proposed method based on activated sludge after wastewater treatment. For the validation process, 10 mL of deionized water (DW) was mixed with 1.0 g of dried sludge with pure nitric acid (2% HNO3), and then the solid phase was filtered with the Whatman filter (WF). The concentration of heavy metals (As, Cd, Cu, Pb, Hg, Mo, Ni, Co, Se, Zn) in the remaining solution of sludge (mg kg-1) and wastewater (µg L-1) was extracted/ separated based on sulfur-doped graphene oxide adsorbent (SDGO) by solid-phase microextraction procedure (SPME) before being determined by the flame and hydride generation atomic absorption spectrometry (F-AAS; HG-AAS) which had similar range to the polarography analysis. The LOD, linear range and preconcentration factor (PF) for metals were obtained.

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Published
2023-12-29
How to Cite
Hassani, M., & Azemi Motlagh, B. (2023). Design and construction of pilot sludge drying package for the excess sludge in petrochemical industries: Heavy metals determination in sludge by polarography and atomic absorption spectrometry. Analytical Methods in Environmental Chemistry Journal, 6(04), 52-64. https://doi.org/10.24200/amecj.v6.i04.315
Issue
Vol 6 No 04 (2023): Issue No. Four
Section
Original Article

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