Tao Zhang
China Agricultural University, China
Title: Phosphorus recovery from animal manure wastewater by advance oxygen process coulped modified biochar adsorption
Biography
Biography: Tao Zhang
Abstract
The loss of phosphorus (P) not only results in water eutrophication but also relate to non-renewable P resources waste. Recently, P recovery from animal manure wastewater has attracted interest. However, there are two main problems inhibit P recovery from animal manure wastewater. Firstly, large amounts of organic phosphorus (mainly referring to phytic acid P) cannot be directly recover, but must be converted into inorganic phosphorus. Secondly, due to many kinds of substances contained in animal manure wastewater, high selectivity methods towards P should be developed. In our work, advance oxygen processes, such as ultrasound, microwave, H2O2, ultrasound/H2O2, microwave/H2O2, were performed to promote P dissolution and transformation. The results indicate that advance oxygen processes were efficient for P release into treated supernatant. The synthesis modified biochar was used to high selectivety recover P from the treated supernatant. The P adsorption by modified biochar followed pseudo second-order kinetics and was mainly controlled by chemical reactions. The Langmuir-Freundlich model matched the experimental data best for P adsorption. The maximum amount of P adsorbed was in the range of 220 to 326 mg/g. The process was endothermic, spontaneous, and showed an increase in disorder at the solid-liquid interface. Postsorption modified biochar continually releases P and is most suitable for use in soil environment as fertilizer.