GRANULAR SEQUENCING BATCH REACTOR AND PHOTO-FENTON PROCESSES FOR TREATMENT OF CATTLE MANURE WASTEWATER

Abstract

In this study, the photo-Fenton process was followed an aerobic granular sequencing batch reactor (SBR). The combined system was used for cattle manure wastewater treatment. In biological stage, the granulated SBR was resistant against feeding shocks, when imposed by substrate with food to microorganisms (F/M) ratio of 1.6. The bioreactor was operated at three different HRTs. Kinetic studies showed the most efficient performance was HRT of 32 h, rather than 24 and 48 h. Fenton and photo-Fenton (ph-F) reactions were individually performed as a polishing stage. The optimized ratios of H2O2/COD (1.5:1) and Fe2+/H2O2 (1:10 M/M) were defined. In ph-F reactions, the impacts of UV-C and solar lights were evaluated, where the chemical oxygen demand (COD) removal efficiencies noticeably enhanced to 82.8 and 85.3%, respectively. The best COD, total Kjeldahl nitrogen (TKN) and total phosphorus (TP) removals for the combined SBR and ph-F systems were 97, 98.5 and 99%, respectively. For the first time, the feasibility of combined aerobic granular SBR and ph-F process for cattle manure wastewater treatment and recycling water were successfully investigated.