Evaluation of Wastewater Treatment Properties of Artificial Soil Aggregates by Materials Analysis After Wastewater Treatment

Abstract

We conducted wastewater treatment tests using columns on artificial soil aggregates, formed by blending diverse materials with soil. After the test, we assessed phosphate adsorption capacity, microbial community biomass carbon content, and carbon source utilization functions in the materials. During the treatment process, the phosphate adsorption capacities decreased due to phosphate adsorption except for artificial soil aggregate mixed with iron powder. The capacities of those mixed with iron powder increased. Higher biomass carbon content was found in the upper part of the columns and in materials with more organic matter. Microorganisms played a role in wastewater treatment; however, excessive biofilm growth might have hindered the efficiency. Carbon source utilization functions in the upper parts of the columns were similar; however, the differences became larger from the middle parts to the lower parts, likely due to variations in microbial habitat and wastewater treatment processes.