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摘要
Taking coking wastewater as the research object, based on literature statistics and analysis of water quality characteristics, the difference of core pollutant removal and energy consumption distribution between two different combined processes of anaerobic pretreatment and aerobic pretreatment was studied, the potential performance development of biological treatment process of coking wastewater was also discussed. The result showed that the main reason for the difference between the energy consumption of aeration and the demand of carbon source was the different removal mechanism of pollutants between the pre-anaerobic or pre-aerobic units. In order to meet the nitrogen removal target of 60 m3·h?1 set water quality (TN < 40 mg·L ?1), the oxygen consumption of O/A/O and A/A/O processes were 83.9 kg·h?1 and 100.4 kg·h?1, respectively. When the thorough pretreatment of oxygen-consuming organic matter and covalent-bonded nitrogen-containing organic matter in wastewater was made, the pre-aerobic process could achieve the removal of total nitrogen with lower energy consumption: A/A/O and O/A/O processes required 122.1 g·m?3 and 486.9 g·m?3 external carbon sources (measured in methanol) to achieve the equal removal of total nitrogen, respectively. The A/A/O, O/A/O and O/H/O processes (H denotes the hydrolytic denitrification unit) were run as single sludge, double sludge and triple sludge systems, respectively, and showed significant differences in energy consumption in terms of sludge reflux and nitrate reflux. Because the O/H/O process did not require sludge reflux and the granular sludge was highly efficient in oxygen transfer, the oxygen consumption for the achievement of the nitrogen removal target was only 53.26 kg·h?1 and the additional carbon source could be reduced to 0~220 g·m?3, demonstrating the potential and superiority of energy saving and consumption reduction. There was scope for the optimization of reactor structures and unit combinations in complex wastewater biological treatment processes. In the process of removing core pollutants and pursuing zero total nitrogen concentrations, it was necessary to ensure the reasonable limits for the electron donor-acceptor, microbial functions and process operating parameters in the wastewater. ? 2022, Science Press. All right reserved.
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