Abstract
BackgroundA novel implementation of a hybrid membrane bioreactor (HMBR) has been studied in this paper. It is utilized as combination of rotating biological contractor (RBC) and an external membrane, as a new biological system for oily wastewater treatment.MethodsChemical oxygen demand (COD) and total petroleum hydrocarbon (TPH) as factors of Biodegradability has been evaluated. They are both compared together for different hydraulic retention times (HRTs) and petroleum pollution concentrations in RBC and HMBR. The ratio of TPH to COD of Molasses has been varied between 0.2 to 0.8 at two HRTs of 18 and 24 hours while the temperature, pH and dissolved oxygen were kept in the range of 20-25°C, 6.5-7.5, and 2-3.5 mg/l, respectively.ResultsThe best TPH removal efficiency (99%) was observed in TPH/COD = 0.6 and HRT = 24 hr in HMBR and Removal efficiency was decreased in the ratios above 0.6 in both bioreactors.ConclusionsThe experimental results showed that HMBR had higher treatment efficiency than RBC at all ratios and HRTs.
Highlights
A novel implementation of a hybrid membrane bioreactor (HMBR) has been studied in this paper
Increasing the ratios of total petroleum hydrocarbon (TPH)/ Chemical oxygen demand (COD) molasses has led to the reduction of COD removal efficiency in both reactors. This is resulted from the fact that increasing TPH/COD molasses makes microorganisms start to use oily hydrocarbons instead of nutrients produced by molasses
In this paper, the behavior of hybrid membrane bioreactor in various loadings of oily pollutant was studied and the results were compared with the time when the rotating biological contactor performs without using a membrane
Summary
A novel implementation of a hybrid membrane bioreactor (HMBR) has been studied in this paper It is utilized as combination of rotating biological contractor (RBC) and an external membrane, as a new biological system for oily wastewater treatment. The HMBR is an advanced technology which traditionally combines activated sludge as a suspended growth system with microfiltration (MF) or ultra filtration (UF) membrane [2]. This process has become an attractive choice for the treatment and reuse of industrial wastewaters such as paper mill; food production; fuel port [3,4,5] and municipal wastewaters [6,7]. The HMBR process has been proved to have many advantages in
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