Abstract
In this study the novel integrated anaerobic/anoxic/aerobic (A/A/O) and shaft aeration process system which could enhance the nutrient removal efficiency of wastewater with a low carbon nitrogen ratio (C/N) was investigated. Several dissolved oxygen (DO) ratios (1.0-2.0, 2.0-3.0, 3.0-4.0 mg/L) were applied in order to obtain more knowledge on the biological nitrogen and phosphorus removal performances. The experiment was carried out on a lab-scale Shaft-Anaerobic-Anoxic-Aerobic (S/A/A/O) wastewater treatment system. The average removal efficiencies of the total organic carbon, total nitrogen and phosphorus were 84.0%, 82.0% and 93.7%, respectively. The result showed that the proposed system was promising for the treatment of wastewater with a low C/N ratio because that in this system nitrification and denitrification happened simultaneously. Besides, the system had an automatic return system and its floor area was small, which made it energy-saving.
Highlights
It is widely acknowledged that the biological nutrient removal (BNR) system was suitable for the wastewater treatment plants nowadays because it can remove nitrogen and phosphorus simultaneously and has an economic advantage and a good flexibility[1]
In order to solve the problems of traditional methods mentioned above, a new energy-saving Shaft/Anaerobic/Anoxic/Aerobic (S/A/A/O) system for black water treatment and recycling was proposed
The concentration of dissolved oxygen (DO) in the aerobic zone was controlled by a controller
Summary
It is widely acknowledged that the biological nutrient removal (BNR) system was suitable for the wastewater treatment plants nowadays because it can remove nitrogen and phosphorus simultaneously and has an economic advantage and a good flexibility[1]. In order to solve the problems of traditional methods mentioned above, a new energy-saving Shaft/Anaerobic/Anoxic/Aerobic (S/A/A/O) system for black water treatment and recycling was proposed. The novel system, integrating S/A/A/O has several substantial advantages This process configuration makes sludge and mixed liquid fully automatic reflow back, which greatly save the energy of operation. It occupies smaller areas and diffuses no foul smell, so it is very reasonable to be used in residential areas. Simultaneous nitrification and denitrification (SND) that occurs in integrated anoxic/aerobic volume of S/A/A/O is a major asset For this reason, SND is the most efficient process which is favorable for the treatment of low carbon wastewater [9, 10]. To the best of our knowledge, this study is the first academic report about treatment and reuse of black water with S/A/A/O process
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