title: [The inherent toxicity of organic extracts in the effluents treated by present treatment and the new process].
abstract: OBJECTIVE
  Evaluate the inherent toxicity of organic extracts in the effluents treated by present treatment and the new process find the scientific evidences of the new wastewater treatment technique to compare the removal efficiency of trace organic pollutants.
  
  
  METHODS
  The Solid Phase Extraction was adopted to enrich the trace organic pollutants in the water samples with resin adsorbing, then detected the inherent toxicity of them by using Vicia faba root-tip micronucleus test and single cell gel electropheorsis test.
  
  
  RESULTS
  After concentrated 100 times, the organic extracts enriched from the water samples showed some positive reactions. The micronuclear rates of root-tip cells were of significantly difference between all groups (F = 42.526, P < 0.001). Compared with each other, the group of DMSO and the group of new technique were not significantly different from the negative control (P > 0.05), but the group of secondary effluent and the group of influent were significantly different from the new technique (P < 0.05), at last, there was significant difference between the secondary effluent and the influent (P < 0.05). After exposed with DMSO and the organic extracts, the length of comet tails and the tailing ratio were obviously different between all groups (F = 243.535 and 148.623 correspodingly, P < 0.001). Compared with negative control, the length of comet tails and the tailing ratio of the influent group and the secondary effluent group were significantly different (P < 0.01). Compared with the influent group, the comet tail length of the secondary effluent group and the tertiary effluent group were both shorter (P < 0.01), and the tailing ratio were both smaller (P < 0.01). The tailing ratio of the tertiary effluent group was significantly smaller than the secondary effluent group.
  
  
  CONCLUSIONS
  The inherent toxicity of urban sewage in Zhengzhou was significantly decreased after treated but it still possesses potential hazard to environment. And the trace organic pollutants in wastewater were removed by the new technique more efficiently than by the present treatment.
authors.forename: Bo
authors.initials: B
authors.lastname: Li
authors.forename: Zhijin
authors.initials: Z
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Cao
authors.forename: Chuanhong
authors.initials: C
authors.lastname: Xing
authors.forename: Liuxin
authors.initials: L
authors.lastname: Cui
mesh_terms: D015162:Micronucleus Tests; D009930:Organic Chemicals / Q000633:toxicity*; D012722:Sewage / Q000737:chemistry*; D031307:Vicia faba; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical
chemical_list: D009930:Organic Chemicals; D012722:Sewage; D014874:Water Pollutants, Chemical