| Aerobic granular sludge is one kind of intensive biopolymer of activated sludge with compact structure and regular shape by self flocculation, under aerobic conditions. Aerobic granular sludge has the advantages of exact density, abundant microbe, strong shock resistance, obvious aerobic-anaerobic partition. Because of compact structure, Aerobic granular sludge can form variety of oxygen environment and nutrition conditions within the same organism, it is a ideal organism of sewage treatment which has broad prospects. As a new wastewater treatment technology, aerobic granular sludge has been a research hotspot of wastewater treatment field.The subject tade ordinary flocculent activated sludge as inoculation sludge, used artificial water and homemade SBR experimental apparatus at the stage of culture, cultured aerobic granular sludge by the methods of gradually improving the water load, changing train operation mode and shortening the settling time etc. The subject studied the shape and the changing process of removing contaminants of granular sludge in the procels of training. Under the different operation modes, the subject studied the removal effect of aerobic granular sludge on pollutant and determined the best operation mode and the effect of DO and different water load on the stability of aerobic granular sludge and removing pollutant,by using the matural granular sludge. By using city sewage raw water domesticate gradually aerobic granular sludge, studied the treatment effection on city sewage water.By gradually improving the water load, constantly shortening the settling time and adjusting SBR train operation mode, after 93 days aerobic granular sludge had been cultured successfully with good trait, which is main sphere, solid granular, smooth surface and uniform particle size and pale yellow in color. The particle size is between 2 to 4mm, the biggest is 6mm. The removal rate of COD NH3-N and TP reached respectively more 94%,91%and 80%.SBR operation mode, the concentration of DO and inlet wastewater load had the great effection on aerobic granular sludge. Under complete aerobic operation condition, the removal effect on pollutant is better stable, the removal rate of COD NH3-N and TP reached respectively 95.4%,90.2% and 83.3%. Comparation with aerobic-anoxic alternate operation, the removal effect was basically the same, and the the removal rate of NH3-N and TP was elevated, respectively is 93.2% and 86.5%. At the experiment of affecting factor of DO, when aeration was 0.05m3/h, aeration can not meet the demand of the system, the COD removal rate decreased to 83%. When aeration increased to 1.0 m3/h, the treatment effect of the system was better, the removal rate of COD NH3-N and TP reached respectively 95.8%,91.1% and 83.8%. When can conduce filamentous bulking and effluent poor, the COD removal rate decreased to 80%. Under the higher COD concentration (1000mg/L), the treating effect of granular sludge still stable, aerobic granular sludge had the stronger ability against shock loading.By gradually increasing the rate of uban sewage water, culturing aerobic particle, based on 20%sewage water, gradually increasing to completely treating uban sewage water. At the 50% sewage water, the system had been a certain impact and gradually restored. In finall, various measures of treating sewage water was stable, the removal rate of COD NH3-N and TP reached respectively 80%,76% and 76.85%.The unique struction of aerobic/anoxic/anaerobic aerobic granular sludge has make aerobic granular sludge have the good capacity of nitrogen and phosphorus removals, and stable system Operation and has the great effect on solving the water pollution of the environment. |
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