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Estrogenic effect of effluent from municipal sewage treatment plant on juvenile goldfish (Carassius auratus) was investigated using condition factor (CF) and vitellogenin (VTG) induction as endpoints. The results showed that no significant difference in CF was observed in fish after 7 d of exposure to all the dilution series of effluent (2.5%, 5%, 10%, 15% and 20% effluent) when compared with the...
During the municipal wastewater reclamation process, the Zeta potential presented significant difference between the particle in the surface water and in the secondary effluent of WWTP with the increasing of PAC. Dissolved organic matter(DOM) in effluent from conventional sewage treatment plant was isolated into five classes using adsorbent resins: hydrophobic bases(HoB), hydrophobic acids(HoA);hydrophilic...
Phosphorus is often a limiting factor for the eutrophication of surface waters. An efficient removal of this constituent from the effluent of municipal wastewater treatment plants has been of growing interest. Alum salts (AlCl3, Al2(SO4)3) and iron salts (FeCl3, FeSO4) are the commonly used chemical coagulants for the removal of phosphorus. The aim of the present work was to evaluate the coagulation...
In order to improve the quality of the river water, raise constructed rapid infiltration(CRI) system was constructed. Practice shows that the location and layout of this ecological engineering conform to the source of pollution, and the system is a new technology which combines natural, social and economic systems in one. In effluent of CRI, the removal rates of CODcr, NH3-N, TN, BOD5, SS and TP are...
At present, the neutralization and precipitation treatment is mostly applied in acid mine drainage treatment, which is widely used and with low running cost and so forth, but biggest problem is that the sediments float in the secondary settling tank and settle down difficultly, then the effluent always can't comply with the wastewater discharge standard. The acid mine drainage samples were from a...
Chemical precipitation with alum was employed as the post-treatment of a micro-aerobic EGSB system treating domestic wastewater to reduce TP concentration. Effectiveness evaluation focused on the influences of reaction/settling time, pH, coagulant dosage and temperature when original TP ranged in 2-8 mg/L. It was found that 20 min was appropriate for flocculation or sedimentation. Samples with original...
In order to study refractory organic matter (OM) from sewage treatment plants (STP), effluents were subjected to a 21-day biodegradation test. Mineral nutrient concentrations were adjusted to get an optimal growth of micro-organisms. This OM defined as the refractory part of biodegradation, was divided into hydrophobic and basic, acid and neutral hydrophilic fractions by passing through XAD-8, AGMP-50...
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