PHOSPHOROUS RECOVERY FROM URINE BASED WASTEWATER OF COWSHED

Abstract

 Cow urine is not reused as liquid fertilizer which can be an alternative secure phosphate resource. This paper aims to confirm the validity of a simulation model for precipitation stoichiometry of precipitations by equilibrium calculation, to identify the chemical spices of the precipitations, and to investigate the effect of dilution by cleaning water on phosphate recovery. As a result, Phreeqc equilibrium solver could be agreed to experimental result at equilibrium condition. XRD analysis and element composition of the precipitations showed existence of calcite and magnesium phosphate which the simulation identified as magnesium ammonium phosphate. Both experimental and simulation result indicated that the dilution of urine reduced of the recovery ratio of phosphate while its effect was small at high initial concentration of phosphate. This indicates the simulation can evaluate the recovery ratio from the initial condition