Treatment of Mixed Wastewater of Slaughterhouse Wastewater and Biogas Slurry with Pilot Contact Oxidation System

In this paper, a pilot contact oxidation system was used to different mixing ratio wastewater of slaughterhouse wastewater and biogas slurry. The results showed that when the mixing ratio of slaughterhouse wastewater and biogas slurry was 19:1 and the HRT of the system was 24h, the COD of effluent met the discharge standard in winter. While when the mixing ratio was 4:1~2:1, the effluent exceeded standard in summer. The increase amount of biogas slurry with surface active agents was the main reason led to worsen of effluent. The system could recover rapidly when the mixing ratio decreased to 14:1, and the COD and ammonia of effluent were under the emission limit.