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Experimental study of submerged membrane bioreactor treatment of oily wastewater of high salt

Author: YeDan
Tutor: GuanWeiSheng
School: Chang'an University
Course: Environmental Engineering
Keywords: Membrane bioreactor High salt oily wastewater Membrane fouling Economic Analysis
CLC: X703
Type: Master's thesis
Year: 2005
Downloads: 431
Quote: 2
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Abstract


With the development of the petrochemical industry, the oily wastewater treatment has been more attention. At present, the basic treatment of oily wastewater follow the old three sets of processes: oil separation - flotation - biological treatment. This approach generally energy consumption, high salt concentration, the inhibition of microbial water quality, the water can not be reused. Looking for a feasible and efficient, economical and reliable, easy to manage high salt oily wastewater treatment process with a wide range of practical significance. In this paper, the characteristics of the high salt oily wastewater using submerged membrane bioreactor its processing, the operating pressure of the membrane flux reactor under different HRT treatment effect, MBR sludge characteristics and turbidity the removal of membrane fouling mechanism and mitigation measures, and economic analysis of the process. The results show that: in the MBR process oily wastewater processing for high-salt conditions of this experiment, HRT were 4,6,8 h effluent COD and oil removal efficiency above 90%, you can achieve an emission standards processing efficiency than conventional biological treatment processes;, MBR pollutant removal effect and there is no obvious advantage in the longer HRT, set process is too long of HRT is not meaningful; the process of turbidity to removal rate between 96.0% to 99.5%, turbidity can almost completely removed; MLSS concentration in the reactor is much higher than that of conventional activated sludge process, the sludge activity MLVSS / MLSS roughly 0.40 to 0.53, lower than the conventional activated sludge under the test conditions (general activity of about 0.75), but higher MLSS concentration in the MBR, the overall effect of the play makes the unit volume of sludge activity was still significantly higher than the conventional activated sludge process for urban sewage; volume load vary between 0.97 ~ 5.29kgCOD / m ~ 3 · d the sludge load fluctuations between 0.13 ~ 0.55kgCOD/kgMLSS · d still guarantee high processing efficiency can be seen that the system is in the high-volume load running under a low sludge load conditions, and also shows a strong shock load capability of the process. This article discusses the mechanism of membrane fouling while also proposed measures to mitigate membrane fouling, membrane module cleaning Shimizu chemical cleaning methods: first rinse the membrane surface adhesion sludge and other substances, and then 0.2% NaClO soak for 6 hours, the membrane flux can basically restored. Economic analysis shows that the the MBR Process high salt oily wastewater is economically feasible, the process also has the comprehensive advantages of the technology, management, investment, covering the cost of processing.

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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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