Abstract:As a kind of advanced oxidation technology, ozone aeration has been widely used in wastewater treatment and disinfection. Ozone aeration of piggery wastewater also significantly affects the forms of phosphorus and effectiveness, which have important effects on the utilization of pigfarm effluent regeneration in farmland. In order to study the influences of different durations of ozone aeration on the phosphorus content and form transformation in anaerobic swine wastewater, the experiment, sampling and measuring the content of phosphorus in different forms, was conducted on self designed apparatus, with five different durations of ozone aeration, 0min, 10min, 20min, 40min, 60min, respectively. The results show that different durations of ozone aeration remarkably affect the content of phosphorus in different forms in wastewater system. Specifically, the contents of total soluble phosphorus, soluble inorganic phosphorus, total organic phosphorus and particulate organic phosphorus show decline trends with the magnitudes of 30.28%, 41.80%, 34.92% and 79.53% at the end of aeration lasted for 60min, respectively. By the contrary, the contents of soluble organic phosphorus, total particulate phosphorus and particulate inorganic phosphorus show upward trend, which increase by 105.11%, 46.74% and 123.86% at the end of 60min （P<0.05), respectively. Meanwhile, the loss of gaseous phosphorus is also detected in the absorbing liquid with trace amount, which only occupying 0.38% of the total phosphorus. The total phosphorus content in the wastewater system is basically unchanged. The loss of available phosphorus and the recovery of particulate phosphorus in the swine wastewater after ozone aeration should be taken into consideration.
