[Pollution Characteristics and Removal Effects of Antibiotics in Wastewater from Large-Scale Pig Farms in Guizhou].

To understand the pollution characteristics and removal effect of antibiotics in the wastewater treatment process of large-scale pig farms in Guizhou, solid-phase extraction-liquid chromatography-tandem mass spectrometry (SPE-LC-MS) was used to investigate the removal of ten veterinary antibiotics from the influent and effluent of each treatment unit during the wastewater treatment process in two large-scale pig farms (named Farm A and Farm B). The results showed that the removal rates of conventional pollutants[including chemical oxygen demand (COD), NH-N, total nitrogen (TN), and total phosphorus (TP)] in Farm A and Farm B were above 88.10%.

[Construction and Mechanism of Methanotroph-based Ultimate Denitrification System for Tailwater of Urban Sewage Plants].

With great practical potential of aerobic methane coupled to denitrification (AME-D) in deep denitrification of tailwater in urban sewage plants, an AME-D extreme denitrification system with low concentration of methane, was established in an improved denitrification biofilter. The finding indicated that in an intermittent operation mode, the average concentration of total nitrogen and ammonia nitrogen in the effluent could reach 1.05 mg·L and 0.

[Pollution Level and Ecological Risk of Typical Antibiotics in Guiyang Wastewater Treatment Plants].

To determine the removal efficiency of typical antibiotics in Guiyang wastewater treatment plants (WWTPs) and the impact of effluent on aquatic organisms in receiving waters, nine antibiotics in the influent, effluent, and receiving water of two WWTPs in Guiyang City were investigated. The concentrations of antibiotics in the influent and effluent ranged from 0 to 835.60 ng·L and 0 to 286.