Sewage treatment process and sewage treatment device

Abstract

The invention discloses a sewage treatment process and a sewage treatment device. The process comprises the steps: S10, dividing sewage into two paths to be conveyed to an anaerobic tank and an anoxic tank respectively, and treating the sewage in the anaerobic tank and enabling the sewage to enter the anoxic tank to be subjected to deep denitrification; S20, enabling sewage in the anoxic tank to flow out in two paths: one path flows back to the anaerobic tank, and the other path sequentially passes through the anoxic aeration tank and the aerobic zone to be fully nitrified; S30, enabling the sewage in the aerobic zone to flow out in two paths: one path flows back to the anoxic tank, and the other path is input into a secondary sedimentation tank for mud-water separation to form precipitated sludge; S40, enabling the precipitated sludge to flow back to the sludge regeneration tank, and carrying out the aeration treatment in the sludge regeneration tank to form activated sludge; S50, enabling the activated sludge in the sludge regeneration tank to flow back to the anoxic tank. According to the invention, sewage is subjected to multi-path water inlet, multi-path backflow, controlled aeration, conditioning and recarburization treatment, and sludge is subjected to activation and backflow treatment, so that the activity of different target bacterial colonies in each area can be improved to realize high-efficiency denitrification, and the aeration process is more energy-saving.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a sewage treatment process and a sewage treatment device. Background technique [0002] In recent years, with the rapid development of my country's economy and society, more and more sewage containing nitrogen and phosphorus has entered natural water bodies, causing the problem of eutrophication in water bodies to become increasingly serious, and water pollution control and treatment are urgently needed. The aggravation of water environmental problems has led the government to promulgate a series of stricter pollutant control strategies and discharge standards. Therefore, the search for nitrogen and phosphorus removal technology with high efficiency, low consumption and no secondary pollution is a hot research topic in the field of water treatment. [0003] Traditional A / O, A2 / O and UCT processes have poor denitrification and phosphorus removal effects, large floor sp...

AI Technical Summary

Problems solved by technology

Although the denitrification effect of this process has been significantly improved, there are still some technical bottlenecks that cannot be broken through

[0005] The process does not set an anaerobic zone, and some refractory organic matter in the influent cannot be fully utilized by denitrifying bacteria; the phosphorus removal effect is not satisfactory

In addition, due to the discharge of excess sludge in the secondary settling tank, the concentration of activated sludge in the reaction zone will decrease; at the same time, due to the lack of oxygen and concentration of the sludge at the bottom of the secondary settling tank, the biological metabolic function and activity will decrease significantly, and it will flow back to the deficient The recovery of the oxygen zone is slow, and the effect of nitrogen and phosphorus removal is difficult to further improve

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