Method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration

Abstract

The invention discloses a method for enhancing sewage nitrogen and phosphorus removal and saving energy and reducing consumption based on pulse aeration. On the basis of a traditional A2O process, different galleries or areas of an aerobic zone are partitioned, a central control system in a sewage treatment plant is used for controlling an air blower, a pipeline and an air valve of an aerating system, the aerobic zone is subjected to pulse aeration, an area in the aerobic zone is always in the low dissolved oxygen state, DO is smaller than 0.5 mg / L, meanwhile, other areas normally aerate to be in high dissolved oxygen state, that is, DO is 2-3 mg / L, different areas of the aerobic zone are alternatively in the low dissolved oxygen state, the time that each area is in the low dissolved oxygen state in one cycle is t / n; t is an aerobic zone hydraulic retention time, and n refers to the number of the galleries or areas; the pulse cycle is an aerobic zone hydraulic retention time; after the aerobic zone is subjected to intermittent pulse aeration, an alternative aerobic-anoxic environment is realized, the denitrification is enhanced, and the sewage treatment effect and the water quality are improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for strengthening sewage denitrification and phosphorus removal and energy saving and consumption reduction based on pulse aeration. Background technique [0002] Nitrogen and phosphorus in discharged sewage are important nutrients that cause water eutrophication. With the increasingly serious problem of water eutrophication in our country and the implementation of the new "Pollutant Discharge Standard for Urban Sewage Plants" (GB18918-2002), the research and development of cost-effective and stable wastewater denitrification and phosphorus removal technology has become an urgent need in the field of water treatment. Technical requirements. At the same time, the operation energy consumption of sewage treatment plant is relatively high, which is the main source of investment cost for its operation; aeration and oxygen supply are also the main consumers of energy...

AI Technical Summary

Problems solved by technology

Continue to increase the reflux ratio, the total nitrogen removal rate will not increase significantly, and the dissolved oxygen from the aerobic tank into the anoxic tank will increase, thereby consuming the organic carbon source in the influent and affecting the efficiency of denitrification and denitrification

[0004] At present, pulse aeration is mainly used to control membrane fouling in membrane bioreactors, and there are no studies and reports on aeration control in sewage treatment plants.

Images