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Triclosan (TCS), a widely used antimicrobial and preservative agent, is an emerging contaminant in aqueous and soil environment. Microbial degradation of TCS has not been reported frequently because of its inhibition of microbe growth. To explore the new microbial resources for TCS biodegradation, fungal endophytes were isolated and screened for the degradation potential. The endophytic strain B4...
The influence of free chlorine on the nitrite accumulation in Biological Aerated Filter (BAF) was investigated by adding chlorine in the bioreactor in order to carry out a shortcut nitrification-denitrification. The relationship of the adding dosage and feeding modes of free chlorine and the nitrite accumulation in BAF were also considered. The results show that the nitrite accumulation could be achieved...
The pollution load of the tannery wastewater was higher than before with the strict environmental protection laws and implying of water-saving process, and aerobic treatment of tannery wastewater was no longer suitable for treating tannery wastewater with high pollution load. In this paper, the UASB (up flow anaerobic sludge blanket) reactor be used to treat the tannery wastewater with high pollution...
Study was made on stability and influencing factors of nitrite accumulation in Biological Aerated Filter (BAF) treating simulated municipal wastewater. The possibility of shortcut nitrification-denitrification in low ammonia wastewater treatment was discussed. The mode of natural start-up was favorable to the nitrite accumulation in BAF and the highest nitrite accumulation rate was over 80%. By adjusting...
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...
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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