PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® FROM THE PUBLISHERS OF PAPER TE Volume 9, Number 3, 2023
Granulated biomass fly ash coupled with fenton process for pulp and paper wastewater treatment JO˜AO PERES RIBEIRO 1 , NUNO C. CRUZ 1 , M´ARCIA C. NEVES 2 , S´ONIA M. RODRIGUES 1 , LUÍS A.C. TARELHO 1 & MARIA ISABEL NUNES 1 The work describes the combination of granulated biomass fly ash (GBFA) with Fenton process to enhance the removal of adsorbable organic halides (AOX) from pulp bleaching wastewater. At optimal operating conditions, wastewater’s chemical and biochemical oxygen dema nd (COD and BOD5, respectively) and colour were also quantified, and operating cost of treatment assessed. For the first time, raw pulp bleaching wastewater was used to granulate BFA, instead of water, reducing the water footprint of the treatment. Five wastewater treatment setups were studied: (i) conventional Fenton process; (ii) GBFA application; (iii) simultaneous application of GBFA and Fenton process; (iv) sequential treatment by GBFA followed by Fenton process; (v) sequential treatment by Fenton process followed by GBFA. The latter yielded the highest AOX removal (60 – 70%), whilst COD was also reduced (≈15%) and wastewater biodegradability (BOD5/COD) was enhanced from 0.075 to a maximum of 0.134. Another positive feature of the proposed solution was that GBFA were successfully recovered and reused without regeneration, yielding similar AOX removal compared with fresh GBFA. The operating cost of removing 1 g of AOX from the pulp bleaching wastewater by the optimal treatment setup (60 – 70% removal of AOX) was 14 – 26% lower than the operating cost of conducting Fenton process alone (50% removal of AOX). Contact information: 1 CESAM – Centre for Environmental and Marine Studies, Department of Environment and Planning, University of Aveiro, 3810-193, Aveiro, Portugal 2 CICECO – Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
Environmental Pollution 317 (2023) 120777. https://doi.org/10.1016/j.envpol.2022.120777 Creative Commons Attribution 4.0 International License
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Article 5 – Wastewater Treatment
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