Low Temperature Catalytic Oxidation of Hydrogen Sulfide in Sour Produced Wastewater Using Activated Carbon Catalysts

Abstract

A process is proposed for the removal of H 2 S from sour produced wastewater at lower temperatures (<25 °C) using an activated carbon as a catalyst and oxygen in air as an oxidizing agent. Hydrodarco-activated carbon catalyst was successfully used in this process in a continuous-flow stirred-tank reactor (CFSTR) in an aqueous solution with a pH of 3-10, and temperature and residence time of the feed in the reactor ranging from 8 to 24 °C and 5.2 to 18.6 min, respectively. This catalyst has higher activity than that of Calgon catalyst in this process. The H 2 S conversion was increased with temperature, the conversion approaching 100% at 24 °C after 90 min of operation at a pH of 4.5 and a residence time of 11.4 min. The Hydrodarcoactivated carbon was capable of sorbing 0.66 g of sulfur/g of carbon before its activity decreased significantly giving conversions below 90%. In a CFSTR, for the sour water with a pH value of 4.5, the rate of H 2 S oxidation in the temperature range 8-24 °C was -r H2S ) (5.072 × 10 10 (µmol/L) 0.76 (1/min)) exp(-21.3 kJ/mol/RT)[H 2 S] 0.24 , [µmol/(L min)].

Sulphide removal from petroleum refinery wastewaters by catalytic oxidation

“…The value of E a obtained in the present study is in close agreement with those obtained by other researchers [38][39][40]. The difference in some values could be due to the types and nature of catalysts in various studies [41]. Table 2 Estimated pseudo-first-order and second-order kinetic model parameters (value ± relative standard deviation) …”

Experimental and simulation study of hydrogen sulfide adsorption on impregnated activated carbon under anaerobic conditions

“…Among the various methods used to remove low concentration H 2 S from gases, adsorption-catalysis by activated carbons (AC) is considered as an efficient and economical approach [3][4][5][6][7][8][9][10][11][12][13][14][15]. The uniqueness of activated carbons as adsorbents and catalyst supports is related to their high surface area, developed pore volume, surface properties, and possibility of modification.…”

H2S Adsorption/Oxidation on Materials Obtained Using Sulfuric Acid Activation of Sewage Sludge-Derived Fertilizer

“…Following the arguments presented above, more sulfur is likely adsorbed in the very small pores of this material, and this process is enhanced by changes in the composition of the solid during heat treatment between 800 and 950 • C. Since elemental sulfur is the predominant product of hydrogen sulfide oxidation on activated carbons (17,25,(28)(29)(30)(31) its presence on SCS-950E can be linked to a relatively high content of a highly carbonized (after treatment at 950…”