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The Cultivation of Aerobic Granules under Different Salinity and Organic Loading Rate and Its Removal Effect Analysis

Author: LiZhi
Tutor: WangXiaoChang
School: Xi'an University of Architecture and Technology
Course: Municipal Engineering
Keywords: salinity aerobic granule sludge SS ammonia pH value autotrophic bacteria heterophic bacteria
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 71
Quote: 1
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Abstract


Aerobic granule is a kind of microbial polymer formed by self-aggregate cultivated in aerobic wastewater system. Aerobic granule has high biomass concentration, excellent settle ability, little surplus sludge, simple separation process for effluent, small occupation area, excellent capacity of resisting disturbance and self-recovery adjustment got more and more concerned. At present has little report about the research of aerobic granule treatment of organic wantewater. But this waste water exhaust was a total amount. So the objective of this work was mianly to study the effect about aerobic granule processing high salinity wastewater under different salinity and organic loading rate.The experiment adopt four complete same SBR reactors, seed sludge obtained from Xi’an dengjiaxcun wastewater processing factory and cultivated the aerobic granular sludge. The exerpriment lasted a total of 68 days, the wasterwater was collected timely and the wasterwater quality parameters was measured, evaluation of aerobic granules physical characteristics. By changing the salinity and COD loading rate,studying the cultivation of aerobic granules under different salinity and organic loading rate and its removal effect analysis.The results show that:（1）Average diameter of aerobic granule arrived 1mm at the end of experiment under the high organic loading（2000mg/L）, but merely arrived 0.5 mm under the low organic loading（400mg/L）. The SS of the former was 8 times than the latter. Aerobic granule was cultivated under the high salinity （5%） has more compact microbial structure and higher settling tempo than the low salinity（2.5%）.（2）Aerobic granule sludge was cultivated under the salinity of 2.5%,the remove rate of the Ammonia and COD maintained the 90% and 95% when organic loading was 2000mg/L,higher than the 70% and 85% which had the different organic loading but the same salinity. Aerobic granule sludge was cultivated under the salinity of 5%,the remove rate of the Ammonia and COD maintained the 90% and 95% when organic loading was 2000mg/L,higher than the 70% and 75% which had the different organic loading but the same salinity.（3）When the salinity was 2.5% or 5%,autotrophic bacteria kept the advantage obviously under the low organic loading（400mg/L）,heterophic bacteria kept the advantage obviously under the high organic loading（2000mg/L）. When the organic loading was 400mg/L ,the high salinity obviously repressed the reproduced of autotrophic bacteria under the high salinity （5%）, making the remove rate of the ammonia descend to 60% and the content of the NO-3-N declined to 5mg/ L in a period. Under the high organic loading（2000mg/L）, the heterophic bacteria got the domination, so the depressed of nitrifician wasn’t obvious when the salinity was 5%.Not matter what the salinity was 2.5% or 5%, salinity of high and low have no obvious influence to the remove rate of COD. The 4 SBR reactors about the remove rate of COD all attain 90% above ,explained the effect of salinity to the heterophic bacteria was below the autotrophic bacteria.（4）Under the same salinity condition （2.5 or 5%）, the pH value with low organic loading （400mg/L） was lower than high organic loading （2000 mg/L）,because autotrophic bacteria kept the advantage .Under the same organic loading （400 or 2000 mg/L）, high salinity obviously repressed the reproduced of autotrophic bacteria,so the pH value of the R3 was higher than the R1, but the R2 and the R4 had little differences.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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