Jiang Anxi and Zhang Jie from the School of Municipal Environmental Engineering, Harbin University of Technology, presided over the project "Improving the Technology and Device Development of Low Temperature Sewage Treatment" recently passed the expert group appraisal, and the research results have reached the international advanced level as a whole.
According to the characteristics of cold areas in North China, the species of cold-resistant bacteria, the determination of immobilization methods, the selection of carriers, the design of high-efficiency low-temperature domestic sewage treatment device, the determination of technical parameters and the microbial ecological mechanism were studied in detail. Scientists grasp the key technology of improving low-temperature sewage treatment, acquire cold-resistant bacteria for low-temperature sewage treatment through research and practice, and develop and design an internal circulation high-efficiency composite bioreactor for low-temperature domestic sewage treatment. The reactor process is reasonable and advanced, and the technology of cold-resistant bacteria and immobilized carrier is innovative. The average removal rates of COD, BOD and TP in low-temperature sewage are achieved. 86%, 90% and 89%, respectively, meet the first class B emission standard, which provides technical parameters and scientific basis for production and application.
The research results of this project have broad application prospects. Compared with the current technology, the improvement rate of COD removal in winter of sewage treatment plant is significantly improved by applying the technical achievements of this project, which not only saves investment and operation costs, but also solves the problem of unstable biological treatment of low-temperature sewage in winter, and has significant economic, environmental and energy benefits.
Experts suggest that field expansion experiments be carried out to investigate the actual operation of cryogenic bacteria in continuous operation and obtain technical parameters, which can be applied to the biological treatment system of low-temperature sewage in North China as soon as possible.