臭氧氧化-苦草深度处理对猪场尾水中有机物的去除效果

摘要

利用臭氧氧化-苦草(Vallisneria natans)深度处理猪场尾水,测定了不同浓度臭氧氧化处理有机物含量和组分的变化,并考察了臭氧氧化-苦草处理去除有机物的效果.结果表明,10(AO1)、30(AO2)和50 mg·L-1(AO3)3个臭氧投加浓度处理分别使UV254降低15.6％、17.6％和29.4％,UV436降低12.2％、7.6％和22.0％,使DOC/UV254比值增加13.9％、16.7％和39.4％;臭氧氧化-苦草处理使DOC含量、UV254和UV436分别降低8.5％～ 17.6％、16.2％～ 35.3％和12.9％～21.8％,使DOC/UV254比值增加10.3％～35.6％.臭氧氧化可使猪场废水中半挥发性有机物形态发生转化,可提高废水可生化性以及有机污染物的降解效率.%Livestock wastewater falls into the category of wastewater with a high concentration of organic pollutants and hence poses a threat to the environment when disposed inappropriately.Ozonation is known as an attractive alternative to treat the wastewater.An experiment was carried out to explore effect of ozonation on concentration and composition of the organic pollutants relative to concentration of ozone and effect of the treatment of ozonation combined with cultivation of Vallisneria natans removing organic pollutants from livestock wastewater.Results show that when exposed to ozone at a rate of 10(AO1),30(AO2) and 50 mg · L-1(AO3) for 30 min,piggery wastewater was lowered by 15.6％,17.6％ and 29.4％,respectively,in UV254 and by 12.2％,7.6％ and 22.0％,respectively,in UV436 and increased by 13.9％,16.7％ and 39.4％,respectively,in DOC/UV254.The treatment of ozonation in combination with cultivation of Vallisneria natans for 4 weeks had the wastewater lowered in by 8.5％-17.6％,16.2％-35.3％ and 12.9％-21.8％ in DOC content,UV254 and UV436,respectively.Obviously ozonation could trigger transformation of the semi volatile organic compounds in the piggery wastewater.All the findings of this experiment indicate that when properly applied,this treatment method can be used to pretreat livestock wastewater before it is discharged,and to promote biodegradability and degrading rate of organic pollutants in the wastewater.