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Influence of the pH value of influent on the nitrite accumulation was investigated in a biological aerated filter (BAF) operated in normal conditions. The removal efficiency of ammonia nitrogen and the performance of nitrite accumulation in the BAF were also discussed. The results showed that the ammonia nitrogen removal in BAF was heavily influenced by the influent pH value. Drastically fluctuating...
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...
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...
A new high-rate dissolved air flotation (DAF) tank was developed and the efficiency was studied through pilot experiments. The turbidity of effluent water was improved 30% at hydraulic loading rate of 18 m/h when the perforated pipe was replaced by perforated plate for the collection of effluent water. A separation system made by a series of lamella plates was installed at the middle part of separation...
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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