System and method for enhanced nitrogen removal of sewage through denitrification

A denitrification and sewage technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve problems such as waste, aging energy consumption of dissolved oxygen sludge, and high concentration of TN in effluent

CN108947100AInactive Publication Date: 2018-12-07KUNMING DIANCHI WATER TREATMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-12-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a system and method for enhanced nitrogen removal of sewage through denitrification. The system for enhanced nitrogen removal of sewage through denitrification comprises an anaerobic pool, an anoxic pool, an aerobic pool and a secondary sedimentation pool which are in successive connection. The system further comprises a control system, wherein the control system is connected with an aeration system and a carbon source feeding system; the control system controls the aeration of an aerator so as to allow the DO concentration of the aerobic pool to be 0.5 to 2.9 mg / L andthe ammonia nitrogen concentration of an effluent to be 0.5 to 1.5 mg / L; the carbon source feeding system comprises a nitrate nitrogen on-line monitor and a carbon source feeding device; the nitratenitrogen on-line monitor feeds a nitrate nitrogen concentration back to the control system; and when the nitrate nitrogen concentration of the effluent of the aerobic pool is higher than the set valueof 10 mg / L, the control system controls the carbon source feeding device to feed 5 to 7 units of a carbon source per unit of nitrate into the anoxic pool. According to the invention, intermittent aeration of a sewage treatment plant is realized, so the effluent stably reaches the standard, and energy consumption in aeration is saved; meanwhile, highly-efficient nitrogen removal is realized through accurate chemical feeding in an anoxic area by using the carbon source feeding system according to the nitrate nitrogen concentration of the effluent, so energy consumption in aeration can be saved,and the DO concentration of a reflux liquid is reduced; and the carbon source is accurately added according to the nitrate nitrogen concentration, so highly-efficient denitrification is realized, andthe cost of the carbon source is saved.
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Description

technical field

[0001] The invention relates to a denitrification system, in particular to a sewage enhanced denitrification denitrification system and a method, belonging to the field of sewage treatment. Background technique

[0002] With the continuous development of the economy and the continuous improvement of environmental protection requirements, my country's water quality requirements for sewage treatment plants are becoming more and more stringent, especially for sewage treatment plants in key river basins ("three lakes and three rivers"). For water-deficient cities, the tail water of sewage treatment plants can be used as reclaimed water for urban greening, river replenishment and road irrigation, etc. Therefore, the water quality of sewage treatment plant tail water has attracted more and more attention.

[0003] Urban sewage treatment plants mainly remove pollutants such as COD, TP and TN in sewage. COD in sewage can be easily removed by microorganisms. At prese...

Examples

Embodiment Construction

[0024] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Apparently, the described embodiment is only a part of the examples of the present invention, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] Such as figure 1 As shown, the enhanced denitrification and denitrification system for sewage in this embodiment includes anaerobic tanks, anoxic tanks, aerobic tanks and secondary sedimentation tanks connected in sequence. There is also a general control system, the general control system is connected with the aeration system 2 and the carbon source dosing system 1; Dosing amount and aeration amount are accurately controlled.

[0026] The carbon source dosing system...