| Aluminum sulfate as a common phosphorus agents and flocculants, is widely used in urban sewage treatment system, the aluminum produce toxic side effects of activated sludge, excess sludge dosing resulting in decreased activity, leading to the deterioration of water quality. The main research method using orthogonal experiment, to find out the best dosage, among the lowest phosphorus removal to achieve the best impact and to find the best balance between the active sludge to guide the actual production.In this study, homemade reactor simulation AA\O technology aerobic, aerobic wastewater treatment plants inoculated sludge, adjusting sludge concentration 3000mg/L, the use of the sewage treatment plant influent. Pro with Pro to take to ensure that the experiment closer to actual production. Experiments to determine the effect of aluminum sulfate degradation characteristics of pollutants, the impact of sludge forms, the impact on sludge settling performance, the impact on the sludge characteristics and its impact on sludge reactor changes in biomass and the like. The main conclusions are as follows:(1)In the degradation of pollutants experiment, when adding an aluminum ion concentration of 50mg/L, maximum removal of COD reached 81.82%. SS maximum removal rate of 88.17%. TP has a maximum removal rate of 78.73%. Aluminum sulfate dosage and NH3-N removal rate is inversely proportional relationship, when the dosage of Omg/L-12.5mg/L, the maximum removal. TN removal rate is almost free from the impact of adding aluminum sulfate, the maximum removal rate is only 7.54%.(2) The impact of the experimental form of sludge by microbes microscopic examination of each component of the mixture were observed compared. With aluminum sulfate dosage increase, native and epigenetic also reduced the number of animals, bacteria colloidal distribution becomes uneven thickness increases, the color becomes deeper. When the aluminum ion concentration of 200mg/L, to the activities of micro-organisms disappear, colloid bacteria highly intensive.(3) On the sludge settling properties, observed and recorded by a mixture of the components of settlement ratio, draw sedimentation rate curve, adding aluminum sulfate found no effect on the sedimentation rate of sludge. But the situation by observing the supernatant was found that when the dosage of 25mg/L, the supernatant was suspended sludge least, the most translucent. With increasing dosage, and the supernatant suspended sludge increased.(4) On the characteristics of the sludge, a mixture of each component by measuring the oxygen uptake rate (OUR), drawn OUR graph found with increasing dosage of aluminum sulfate, OUR component decreases, blank Group y=-0.2913x+ 9.0898; b group (12.5mg/L) y=-0.2694x+9.2367; c group (25mg/L) y=-0.2013x +9.4512; d group (50mg/L) y=-0.1058x+9.83; e group (100mg/L) y=-0.0325x +9.4149; when an aluminum ion concentration of 100mg/L, OUR only 0.06mg/L· min illustrate the role of activated sludge almost stopped breathing.(5) Change on sludge reactor biomass mixture by measuring the change in the components of the reactor within 5 days of the mixed liquor suspended MLSS concentration of suspended solids concentration and play MLVSS of. Draw a graph through comparative analysis, found that parts of five days in each group MLSS and MLVSS almost the same, while the graph drawing of Changes in the concentration of inorganic is also very close, indicating that growth in the amount of MLSS reflects the change in the container biomass, while Description dosage of aluminum sulfate had no significant effect on the change in the activated sludge.(6) By analyzing the effect of phosphorus and ammonia removal, and to determine the optimal dosage for the aluminum ion concentration 0-12.5mg/L. Should be combined with the actual production situation, the dosage can be adjusted. |
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