Abstract
A moving bed biofilm reactor (MBBR) is a kind of commonly used biological sewage treatment process. A carrier, the core of MBBR, could directly affect the treatment efficiency of MBBR. In this experiment, a hybrid carrier composed of an MBBR carrier and fluidized bed porous carrier was innovatively utilized to treat low-concentration simulated domestic sewage through an MBBR reactor to investigate the effects of different hydraulic retention times (HRT) and different carrier dose ratios on the reactor performance. The results indicated that when the volume ratio of the carrier dosage was 5% : 20% when the reactor HRT was 5 h, the removal rates of ammonia nitrogen, total nitrogen (TN) and chemical oxygen demand (CODCr) were optimal, which were 96.5%, 60.9% and 91.5%, respectively. The ammonia nitrogen, total nitrogen and CODCr concentrations of the effluent were 1.04 mg L−1, 12.20 mg L−1 and 29.02 mg L−1, respectively. Furthermore, the total biomass concentration in the hybrid carrier biofilm reactor (HCBR) was 3790.35 mg L−1, which also reached the highest value. As the experiment progressed, the concentrations of protein, polysaccharide and soluble microbial products (SMP) were reduced to 7.68 mg L−1, 11.10 mg L−1 and 18.08 mg L−1, respectively. This was basically consistent with the results of the three-dimensional fluorescence spectrum. The results showed that the combined-carrier biofilm reactor could reduce the volumetric filling rate, improving the removal capability of organic matter and the denitrification efficiency. This study provided technical support for the composite carrier biofilm wastewater treatment technology, and also had a good prospect of application.
Highlights
With the development of economy and the progress of times, the sewage generated in the production and life of society has become more and more diversi ed
In order to solve the problems of these two processes,[2] the moving bed biofilm reactor (MBBR) method came into existence
To investigate the effects of different hydraulic retention times (HRT) and different carrier dose ratios on the reactor performance, the simulated domestic sewage in this experiment was treated by adjusting the ratio of the two kinds of carriers at different operating conditions
Summary
With the development of economy and the progress of times, the sewage generated in the production and life of society has become more and more diversi ed. With the continuous development of economic and ecological concepts, the discharge standards of sewage have become more and more strict.[1] Conventional wastewater treatment methods have been challenging to meet the increasing sewage treatment requirements. The most commonly used methods are activated sludge method and bio lm method. They have disadvantages, such as large land area, high cost and weak adaptability to changes in wastewater quality and quantity. The bio lm method has the disadvantages of easy clogging and regular backwashing. In order to solve the problems of these two processes,[2] the MBBR method came into existence
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