Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (1): 84-90.doi: 10.11934/j.issn.1673-4831.2017.01.012

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Efficiency of Ozonation Combined With Cultivation of Vallisneria natans Removing Organic Substances in Piggery Wastewater

WANG Jun-li, CHEN Gui-fa, LIU Fu-xing, SONG Xiang-fu, ZOU Guo-yan   

  1. Shanghai Academy of Agricultural Science, Shanghai 201403, China
  • Received:2016-05-04 Online:2017-01-25 Published:2017-01-22

Abstract:

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.

Key words: ozonation, advanced treatment, piggery tail water, Vallisneria natans, organics

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