Continuous flow step-feed short-cut denitrification-anaerobic ammonia oxidation coupling denitrification sewage treatment system and method

Abstract

The invention belongs to the technical field of sewage denitrification, and discloses a continuous flow step-feed short-cut denitrification-anaerobic ammonia oxidation coupling denitrification sewage treatment system and method. The system comprises a primary sedimentation tank, a bioreactor and a secondary sedimentation tank which are sequentially connected, wherein the bioreactor comprises a pre-starvation zone, a first anoxic zone, a first aerobic zone, a second anoxic zone and a second aerobic zone; stirrers are arranged in the pre-starvation zone, the first anoxic zone and the second anoxic zone; aeration devices are arranged in the first aerobic zone and the second aerobic zone; polyurethane sponge fillers are arranged in the first anoxic zone and the second anoxic zone; and a nitrification liquid reflux pump is arranged between the first aerobic zone and the pre-starvation zone. A carbon source of raw sewage is reasonably utilized, and the sewage denitrification device and the process control method which have the advantages of efficient denitrification effect, simple process flow, convenience in operation and maintenance, automation and intelligence are developed.

Description

technical field [0001] The invention belongs to the technical field of denitrification of sewage, and more specifically relates to a continuous-flow segmented inflow short-range denitrification-ANAMMOX coupled denitrification sewage treatment system and method. Background technique [0002] With the development of sewage treatment technology, it has become a trend for sewage denitrification treatment to reach the standard discharge, but the increase in operating costs caused by the addition of external carbon sources is the key to restricting the low-consumption operation of many sewage treatment plants. At the same time, my country's sewage treatment plants consume more than 1×10 electricity per year 11 KWh, while the aeration energy required for ammonia nitrogen oxidation in the sewage treatment aeration tank accounts for more than 40% of the power consumption of the sewage treatment plant, which seriously restricts the economical operation of the sewage plant. A stable a...

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Problems solved by technology

[0002] With the development of sewage treatment technology, it has become a trend for sewage denitrification treatment to reach the standard discharge, but the increase in operating costs caused by the addition of external carbon sources is the key to restricting the low-consumption operation of many sewage treatment plants

At the same time, my country's sewage treatment plants consume more than 1×10 electricity per year 11 KWh, while the aeration energy required for ammonia nitrogen oxidation in the sewage treatment aeration tank accounts for more than 40% of the power consumption of the sewage treatment plant, which seriously restricts the economical operation of the sewage plant. A stable and easy-to-operate process control method is an urgent problem in the field of sewage treatment

[0003] Anammox autotrophic denitrification process refers to complete denitrification by converting ammonia nitrogen and nitrite nitrogen into nitrogen. Compared with traditional nitrification / denitrification biological denitrification, it has the advantages of saving aeration energy consumption and saving organic carbon sources. However, the accumulation of nitrite nitrogen is greatly affected by environmental factors (such as temperature, pH, DO, etc.) It has been widely used, but it is rarely used in the mainstream treatment of sewage with low matrix concentration such as urban domestic sewage

At the same time, the anammox process cannot remove the nitrate nitrogen carried by the influent and the nitrate nitrogen produced by the anammox process, resulting in a high concentration of total nitrogen in the effluent, and it is necessary to adopt a deep denitrification treatment with an external carbon source, resulting in a cost increase

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