【摘要】 采用臭氧氧化法处理猪场沼液一级生化出水,研究反应时间、臭氧投加量、pH值对COD去除率的影响,通过单因素实验和正交实验确定最佳反应条件,分析臭氧对废水可生化性的影响。结果表明:延长反应时间、提高臭氧投加量和pH值均能提高COD去除率,但pH值过高COD去除率反而会降低,pH从10.6提高至11.8时,COD去除率从42.2%降至35.5%;反应条件对COD去除率的影响顺序为反应时间>pH值>臭氧投加量,最佳反应条件为反应时间40 min、臭氧投加量30 g·h^-1、pH值9.6;臭氧可有效提高废水的可生化性,废水经过40 min的氧化,B/C由0.12提高至0.45,氧化时间过长会使B/C有所降低。更多还原

【Abstract】 The primary biochemical effluent of pig farm biogas slurry was treated by ozone oxidation technology.The effects of reaction time,ozone dosage and pH value on COD removal rate were studied.The optimal reaction conditions were determined by single factor experiment and orthogonal experiment.The effect of ozone on the biodegradability of wastewater was analyzed.The results showed that prolonging the reaction time and increasing the dosage of ozone and the pH value could increase the removal rate of COD.However,if the pH value is too high,the COD removal rate will decrease.When the pH increased from 10.6 to 11.8,the COD removal rate reduced from 42.2% to 35.5%.The order of reaction conditions on COD removal rate is reaction time >pH value >ozone dosage.The best reaction conditions for reaction time,ozone dosage,and Ph are 40 min,30 g·h^-1,pH 9.6 respectively.Ozone can effectively improve the biodegradability of wastewater.When the wastewater is oxidized for 40 minutes,the B/C is increased from 0.12 to 0.45.If the oxidation time is too long,the B/C will decrease.更多还原