ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

An experimental study on the pretreatment of lignite upgrading wastewater using the Fenton oxidation method

Lijun Chen, Bojiao Yan, and Hai Lu

China Northeast Municipal Engineering Design and Research Institute Co. LTD, Changchun, China

E-mail: yanbojiao1985@126.com

Received: 18 May 2021  Accepted: 11 September 2021

Abstract:

Given the characteristics of the high content of phenols and poor biodegradability in lignite upgrading wastewater, the Fenton oxidation process was used as a pretreatment technology of the biochemical treatment process. Therefore, the best reaction conditions within the range of test conditions were investigated. The results show that the best reaction conditions of the Fenton oxidation system within the range tested are as follows: The ratio of H₂O₂/chemical oxygen demand (COD) was 1.25, the pH value was 3.5, the H₂O₂/Fe^{2 +} molar ratio was 1:1, and the reaction time was 60 min. Under these conditions, the highest biochemical oxygen demand (BOD₅)/COD value obtained was 0.74; the COD removal efficiency increased by 63.55%. And the output of iron sludge characterized by 30-min static sedimentation ratio was about 45.1%.

Keywords: Fenton oxidation; Lignite upgrading wastewater; Phenolic wastewater; Biodegradability

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01871-w

Chemical Papers 76 (1) 393–399 (2022)