Waste treatment with the pilot scale ATAD and EGSB pig slurry management system followed by sequencing batch treatment

Abstract

Experiments for highly concentrated contaminants in pig waste slurry were carried out for the feasibility test of a pilot-scale innovative process scheme of engaging autothermal thermophilic aerobic digestion (ATAD) and expended granular sludge bed (EGSB) followed by sequencing batch reactor (SBR) system. Contaminants in pig waste slurry such as organic substance, total nitrogen (TN), ammonia nitrogen and total phosphorus (TP) contents were successfully reduced in the system. Total volatile solids (TVS) and chemical oxygen demands (COD) for organic matter in the feed were 32.92 g/L and 42.55 g/L respectively, and they were reduced by about 98.7% and 99.2%, respectively in the system. The overall removal efficiencies for TN and ammonium nitrogen were found to be 98.1 and 98.5%, respectively. The overall removal efficiency for total phosphorus was also found to be 92.5%. Faecal coliform density was reduced to < 1.2×10 4 CFU/g total solids. Biogas and CH4 were produced in the range of 0.39-0.85 and 0.25-0.62 m 3 /kg [VS removed], respectively. The biogas produced in the system comprised of 295±26 ppm (v/v) [H2S].

Utilization of Thermophilic Aerobic Oxidation and Electrocoagulation to Improve Fertilizer Quality from Mixed Manure Influent

“…The aeration and circulation of the TAO system decreased the NH 4 -N levels and increased the NO 3 -N levels via the nitrification process involving oxidative reactions [53], which also led to a slight increase in TN. Aerobic breakdown also reduced the TP by 59% because the TAO effluent remained alkaline, leading to the precipitation of P under thermophilic conditions (Table 3) [53,54]. Furthermore, according to Juteau [55], a similar reduction in COD took place during thermophilic aeration at 60 • C as a result of the hydraulic residence time, temperature, oxygen transfer, stabilization of the mixing characteristics, and the degradation of organic matter [56].…”

Anaerobic Digestion of Pig Slurry in Fixed-Bed and Expanded Granular Sludge Bed Reactors

“…EGSB reactors are a modified version of the UASB reactor that was developed to intensify hydraulic mixing and substrate sludge contact [22]. Lee and Han [23,24] used EGSB reactors as part of a multistage system for treating PS. The system presented in these studies includes auto-thermal aerobic digestion, a coagulation process, and centrifugation as pretreatment, an organic acid tank and EGSB reactor as the main treatment, and sequencing batch reactors as the post-treatment at laboratory and pilot scale.…”