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A modified oxidation ditch process is applied in a full-scale municipal wastewater treatment plant. Compared with the conventional oxidation ditch, the modified oxidation ditch adds some microporous aerators to improve oxygen utilization. The measures bring about a further improvement of nitrogen and phosphorus in the urban wastewater. The monitoring results for one year show that the influent concentrations...
Heavy metals contamination and other physico-chemical changes in underground and surface water by acid mine drainage (AMD) were determined on the impact on creeks or streams. High levels of these metals have been reported in mining areas over the years; however, investigations indicates that less monitoring has been done on water discharged as effluent for effective maintenance mechanisms to be effected...
The disinfection effect of Copepod of zooplankton with chlorine dioxide was compared with that of chlorine. The experimental results showed that chlorine dioxide was more effective to kill Copepod. Copepod was completely killed by 1.0mg/L of chlorine dioxide for contacting 30 min but the required dosage were about 2.0mg/L of liquid chlorine. The body structure variety of Copepod indicated that the...
Bio-sand filter was adopted to study the iron and manganese removal from micro-polluted surface source water, and the effect by biofilm formation method, dissolved oxygen (DO) and water temperature on iron and manganese were analyzed. The results demonstrate that natural start-up and inoculm start-up methods of filters both have a high removal of iron and manganese. The former method is better than...
The traditional Expanded Granular Sludge Bed (EGSB) reactor was modified to treating municipal wastewater. The characteristics of Oxidation Reduction Potential (ORP) and Volatile Fatty Acid (VFA) concentration of effluent was studied to judge to the operation condition of anaerobic degradation process. The characteristics of ORP and VFA for treating municipal wastewater was studied in modified Expanded...
A combined system consisting of an up-flow anaerobic sludge blanket (UASB) and anoxic/aerobic bioreactor was introduced to treat a mature landfill leachate with a high ammonia concentration and low ratio of COD/TN. After 160 days of stable operation, the results indicated that organic matters were mainly removed by the UASB, while the ammonia was removed by shortcut nitrification in the anoxic/aerobic...
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