Dairy wastewater utilization by combination of oxidation pre-treatment and ultrafiltration

Zakar, Mihály and Beszédes, Sándor and Hanczné Lakatos, Erika and Keszthelyi-Szabó, Gábor and László, Zsuzsanna (2021) Dairy wastewater utilization by combination of oxidation pre-treatment and ultrafiltration. ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL, 20 (11). pp. 1711-1719. ISSN 1582-9596

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Abstract

In this work the effects of oxidation pre-treatments (ozonation and Fenton reaction) on membrane filtration of dairy wastewater were investigated, together with the further utilization possibilities of residual wastes. The oxidation pre-treatments enhanced the membrane filtration efficiency, from which the short-term ozone treatment was found to be the most effective method both in terms of increasing the flux and the pollutant removal efficiency. After ozone pre-treatment the phosphate and ammonium content of the wastewater migrated to the permeate, while after Fenton pre-treatment the phosphate content remained in the concentrate, and the ammonium content in the permeate decreased. The concentrate was utilized as biogas resource and it was found that both pretreatments increased the biogas production and its methane content as well. Based on our results it can be concluded that ozone pretreatment combined with membrane separation have improved the efficiency of dairy wastewater treatment and may suit the requirements of circular economy.

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