Pilot-scale study on catalytic ozonation of bio-treated dyeing and finishing wastewater using recycled waste iron shavings as a catalyst.

ABSTRACT: A pilot scale reactor with an effective volume of 2.93 m3 was built in-situ and run in both batch and continuous modes to investigate the removal for organic pollutants in bio-treated dyeing and finishing wastewater by heterogeneous catalytic ozonation under neutral pH with waste iron shavings as a catalyst. Experimental results showed that both running modes were able to reduce the chemical oxygen demand (COD) from 132-148?mg/L to a level below the discharge criteria (<80?mg/L) within 15-30?mins under several conditions. Specifically, significantly organic removal was observed with COD, soluble COD (sCOD) and dissolved organic carbon (DOC) decreased from the initial 165, 93 and 76?mg/L to 54, 28 and 16?mg/L respectively, when treated by 10.2 g-O3/min of ozone dosage at a hydraulic retention time of 30?mins under continuous mode. 80% proteins and 85% polysaccharides were removed with a decrease in their contribution to sCOD from 69% to 43%. Mineralization as well as conversion of high molecular organic compounds was observed through Gas Chromatography-Mass Spectrometer (GC-MS) & Liquid Chromatography-Mass Spectrometer (LC-MS) analysis, which led to a decrease of inhibitory effect from 29% to 25%, suggesting a reduction in the acute toxicity.

SUBMITTER: Ma J 

PROVIDER: S-EPMC5954159 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature