Comparison of two methods of neutralization and wet air oxidation for treating wastewater spent caustic produced by oil refineries

Elmi, Roghaye; Nejaei, Arezoo; Farshi, Amir; Ramazani, Mohammad Ebrahim; Alaie, Ebrahim

doi:10.1007/s10661-021-09625-7

Cited by 5 publications

(1 citation statement)

References 36 publications

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“…The technology for the treatment of spent caustic includes neutralization, incineration, Fenton oxidation and wet air oxidation (WAO). At present, wet air oxidation is widely used as a common treatment method for spent caustic [ 6 , 7 ]. After treatment by the wet air oxidation process, the sulfide is oxidized to sulfate so as to remove the odor, and the organics are also partially decomposed into CO 2 and H 2 O to reduce COD.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Fly Ash-Based Geopolymers Activated with Spent Caustic

Zhang

Qian

Zhang

et al. 2022

Gels

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The spent caustic with strong alkali first replaced the alkali activator to prepare the geopolymer. The influence of spent caustic to the geopolymer was characterized through compressive strength measurement, XRD, MIP analysis and NMR, and the immobilization efficiency of organic in geopolymer was evaluated through the measurement of total organic carbon (TOC). The results show that the spent caustic can partially replace the alkali activator to prepare the geopolymer, and it shows a better performance than that which was activated with pure NaOH solution when the alkalinity is between 4 mol and 14 mol. The organic matter in the spent alkali can be effectively fixed in the geopolymer, which will hinder the geopolymerization in the initial stage of the polymerization reaction but has little effect on the chemical structure and mechanical properties of the final product. With the degree of alkalinity increasing, the immobilization efficiency is improved, and the maximum can reach 84.5%. The organics in the spent caustic will hinder geopolymerization at the initial stage but has little effect on the chemical structure and mechanical property of the final product. This study proposes a new method for the recycling of spent caustic, which also reduces the preparation cost of geopolymers.

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Section: Introductionmentioning

confidence: 99%