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| Influence of sludge retention time on denitrifying dephosphatation propensity and membrane fouling behavior in a UCT-MBR process |
| WANG Zhao-zhao1, YAN Li-na2, LI Si-min1, TANG Feng-bing1, ZHANG Kai1, LI Jun3 |
1. College of Urban Construction, Hebei University of Engineering, Handan 056038, China;
2. Graduate School, Hebei University of Engineering, Handan 056038, China;
3. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract A bench-scale nitrogen and phosphorus removal membrane bioreactor (UCT-MBR) was operated to treat municipal wastewater in southern parts of Hebei province regarding on the influence of sludge retention time on the denitrifying dephosphatation propensity and membrane fouling behavior. Either shorter (15d) or longer (40d) SRT could deteriorate the accumulations of DPAOs; denitrifying dephosphatation was strengthened to the maximum degree under SRT of 25d, the ratio of the DPAOs to PAOs and anoxic dephosphatation efficiency reaching the maximum values of 50.8% and 88%, with TP,TN maximum removal efficiencies of 91.7%, 73.6% and effluents of 0.48, 13.3mg/L respectively. SRT had slight effects on the COD and ammonia removals, with average removal efficiencies of 88.9%, 99.7% and effluents of 30.8, 0.15mg/L respectively; with the prolonged SRT, the increase of MLSS concentration, the SMP < 1kDa, SMP > 100kDa concentration, EPS < 1kDa, EPS > 100kDa specific concentration and decrease of PSD resulted in the sludge filterability deterioration, accelerating membrane permeability decline and shortening of sustainable operational cycle, whereas FT-IR analysis of membrane surface foulants showed that SRT had no significant effects on the compositions and refractive index of infrared spectroscopy presented the consistence with the amounts of SMP and EPS.
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Received: 07 November 2015
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