Treatment system for wastewater with high ammonia nitrogen and low carbon nitrogen ratio

The treatment process of aeration sedimentation-primary denitrification-secondary denitrification-nitrification solves the problems of high energy consumption and insufficient carbon source in wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratio, achieving efficient wastewater treatment and resource utilization, and meeting the standards for wastewater discharge.

CN223576295UActive Publication Date: 2025-11-21TIANJIN CAPITAL ENVIRONMENTAL PROTECTION GRP CO LTD +1
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Patent Information

Application Number
CN202423104615.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-11-21
Estimated Expiration
2034-12-16

AI Technical Summary

Technical Problem

Traditional nitrification-denitrification technologies are energy-intensive, require additional carbon sources, and cannot meet total nitrogen standards when treating wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratios. Furthermore, short-cut nitrification-anaerobic ammonia oxidation processes result in residual nitrate nitrogen in the effluent.

Method used

The treatment process adopts aeration sedimentation-primary denitrification-secondary denitrification-nitrification. Organic matter and suspended solids are removed through the aeration sedimentation tank group. The primary denitrification reactor performs short-cut nitrification and anaerobic ammonia oxidation. The secondary denitrification reactor performs denitrification and anaerobic ammonia oxidation. Anaerobic ammonia oxidizing bacteria are collected in the water tank and enter the secondary denitrification reactor. The nitrification tank oxidizes ammonia nitrogen into nitrate.

Benefits of technology

It achieves effective treatment of wastewater with high ammonia nitrogen and low carbon-to-nitrogen ratio, reduces aeration volume and carbon source requirements, meets the standards for sewage discharge, reduces sludge production and operating costs, and realizes resource utilization of anaerobic ammonia oxidizing bacteria.

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Abstract

The utility model provides a treatment system for wastewater with high ammonia nitrogen and low carbon nitrogen ratio, which relates to the technical field of wastewater treatment and comprises an aeration sedimentation tank group, a primary denitrification reactor, a water tank, a secondary denitrification reactor and a nitrification tank which are sequentially arranged along the wastewater treatment direction, the aeration sedimentation tank group is used for removing organic matters and suspended matters in the sewage, reducing the concentration of metal ions and adjusting the pH value of the sewage; the primary denitrification reactor is communicated with the aeration sedimentation tank group and is used for carrying out short-cut nitrification reaction and anaerobic ammonia oxidation reaction; the top of the water tank is communicated with the primary denitrification reactor, and the bottom of the water tank is communicated with the secondary denitrification reactor through a first pipeline; the second-stage denitrification reactor is used for carrying out denitrification reaction coupling short-cut denitrification reaction and anaerobic ammonia oxidation reaction, and the second-stage denitrification reactor is provided with a first water outlet communicated with the first pipeline and a second water outlet communicated with the nitrification tank. The treatment system can ensure that high-ammonia-nitrogen low-carbon-nitrogen-ratio wastewater treatment reaches the nanotube standard.
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