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Applied Basic Study on Degradation of Different Substrates in SBR

Author: LiuChunHui
Tutor: GaoZhengHong
School: Tianjin University
Course: Physical and chemical
Keywords: general concentration SBR high concentration SBR activated sludge phenol soluble microbial product (SMP) dissolved oxygen (DO)
CLC: X703
Type: Master's thesis
Year: 2009
Downloads: 30
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Abstract


In this paper, based on the preliminary work, general concentration (MLSS<5g/L) and high concentration (5g/L <MLSS<10g/L) sequencing batch reactors (SBR) were used to treat man-made phenol-containing wastewater at similar operation parameters and modes. The difference in the property of activated sludge was investigated for two SBR systems by measuring settleability of activated sludge, effluent COD, and observing microorganism. During the stable operation period of two SBR systems, the effluent was of low COD (<50 mg/L, discharge standard at the national level) and very low phenol concentration (<33μg /L) far better than the national discharge standard (500μg /L). But it was found that the high concentration SBR system has a longer stable operation period, accompanying the stable settleability of activated sludge and microbial ecosystem, than general concentration SBR system.During the mature period of activated sludge, the DO in degradation process was respectively checked for SBR systems containing different types of influent (glucose+ phenol, glucose+peptone, glucose+peptone+phenol). And that was also done under different stages (acclimation, initial cultivation, maturity, and anaphase) of whole experiment. According to the obtained curves of DO change, the synergistic effect of different kinds of microbes was discussed while the influent was composed of glucose+peptone+phenol. And the indication function of the DO to the state of activated sludge was considered.The production and the MW distribution of soluble microbial product (SMP) were observed when treating different kinds of influent (glucose+peptone, glucose+peptone+phenol) in SBR system. The effluent COD before and after the period of endogenous respiration was measured after flitration and the effluent was dialyzed using dialysis bag (MW: 7000Da and 14000Da, respectively). The measured results show that the MW distribution of SMP exhibits a bimodal pattern,which is hardly affected by endogenous respiration, when treating two types of man-made wastewater. In addition, the total amount of SMP decreases slightly through endogenous respiration in the treatment system without phenol, whereas the small fluctuation of the total amount of SMP is irregular in the treatment system with phenol.

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