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A comparative study on phosphate removal between activated steel slag and blast furnace slag was investigated. The efficiency of different slags before and after activated for phosphate removal were also evaluated. The results show that the slags activated by hydrothermal treatment are more efficient than raw slags in phosphate removal. The activated slags could be reused for several times and the...
The removal of phosphate by KMnO4-Fe(II) process was investigated under different experimental conditions. The results showed that mix speeds and settling time had no significant effect on phosphate removal. The removal of phosphate was gradually increased with the increase of Fe dosages and decreased with the increase of pH. When the pH increased from 4 to 9, the removal of phosphate decreased from...
The partitioning of 13 kinds of representative endocrine disrupting chemicals (EDCs) between liquid and solid phases of wastewaters in a sewage treatment plant (STP) were studied. It was found that almost all EDCs' partition coefficients (Dp) between aquatic and solid phases have been observed to have a negative relationship with the concentrations of suspended solids (SS) and dissolved organic carbon...
Methyl tert-butyl ether(MTBE) is widely used as gasoline additive. Surface waters in China were polluted by MTBE with different degrees. MTBE was found to be one of the most resistant towards molecular ozone attack and difficult to be degraded by microbe. In this study, experiments were carried out to investigate the removal efficiency of MTBE by catalytic ozonation in the presence of two kinds of...
The genotoxicity of nitrobenzene was evaluated by Vicia faba micronuclei (MN) assay, chromosomal aberration assay and mitotic index assay. Vicia faba primary root tip cell mitotic index (MI) increased following NB concentration from 5 mg/L to 50 mg/L. It implies that NB may effect on the mitosis of Vicia faba root tip cells, promote at lower concentration and inhibit at higher concentration. NB induces...
The present work consisted in the study of Titania/Zeolite catalyzed ozonation for nitrobenzene removal. Catalytic activity of the supported TiO2 is strongly influenced by the heat treatment temperature. Titania/Zeolite calcined at 600??C showed the best activity. An approximate increase of 21% in removal rate was achieved for catalytic ozonation compared with single ozonation. Kinetic study of dissolved...
Phosphorous removal in secondary by ferric (Fe(III)) was investigated in presence of ferrate (Fe(VI))/ferrous(Fe(II)). In the raw water, adding Fe(VI) or Fe(VI)+Fe(II) could increase the phosphorous removal in comparison to Fe(III) coagulation. For initial phosphate concentration of 2.5 mg P/L, phosphate removal rates of about 15-30% were observed. But the increasing removal rate was not associated...
Solid phase extraction (SPE)/high performance liquid chromatography (HPLC) was employed to simultaneously determine 13 kinds of interested endocrine disrupting chemicals (EDCs) in the wastewater taken from a sewage treatment plant (STP) of Harbin, China. Results show that the concentrations of estriol, estrone, dimethyl phthalate (DMP) and 4-tert-octylphenol (4-J-OP) increase in the primary sedimentation...
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