Anaerobic Baffled Reactor (ABR) for Alkali-minimization Dyeing-printing Wastewater Biodegradation

The performance of the laboratory scale anaerobic baffled reactor (ABR) was investigated by the use of granular sludge to treat alkali-minimization and dyeing-printing wastewater (ADW-water). The experiment showed that the start-up of reactor was completed after 70 days operation with sustaining high microbial activity. Under the condition of hydraulic retention time (HRT)=36 h, organic loading rate (OLR)=1.93 kgCOD/m³·d, Temperature=33±1 °C, influent alkalinity concentration= 350 mg/L and pH 8.5, the indicators of COD and UV254 removal efficiencies were around 79 % and 28 %, respectively. The removal of total VFA concentration reached about 72 % and the average concentration of methane in the biogas maintained about 57 % for the entire study. Obvious microorganism separation and microbial selection zoning appeared in ABR system. The experimental results demonstrated that the laboratory scaled ABR process was highly efficient to treat ADW-water.