A device and method for starting and stably maintaining short-cut nitrification of urban sewage

A technology for urban sewage and short-range nitrification, applied in chemical instruments and methods, adjustment methods for biological treatment, biological water/sewage treatment, etc. Short, reduce personnel management requirements and costs, convenient operation and control effects

Active Publication Date: 2021-06-25
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the methods used to achieve short-cut nitrification mainly include high-concentration free ammonia (FA) and high-concentration free nitrite (FNA), low dissolved oxygen (DO), short sludge time (SRT) combined with aeration time control. Aerobic intermittent aeration means and adding inhibitors, etc. Although the above methods can achieve short-range nitrification, the start-up time is long, and the short-range operation is difficult to maintain stably. Once aeration occurs, the short-range will be destroyed;

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  • A device and method for starting and stably maintaining short-cut nitrification of urban sewage
  • A device and method for starting and stably maintaining short-cut nitrification of urban sewage
  • A device and method for starting and stably maintaining short-cut nitrification of urban sewage

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Embodiment Construction

[0030] Below in conjunction with test implementation technical scheme of the present invention is further described;

[0031] The implementation steps of the present invention are as follows;

[0032] The sewage in the urban sewage raw water tank (1) enters the short-range nitrification device (30) through the third water inlet pump (37) and the third water inlet valve (38). 90min, aeration for 120min, sedimentation for 30min, drainage for 20min, idle for 200min, 3 cycles / day, the temperature during operation is room temperature, DO is greater than 3mg / L, pH changes with influent water quality (6.8-7.5), and the sludge concentration is maintained at 3500 ±200mg / L;

[0033] The sewage in the urban sewage raw water tank (1) enters the whole process nitrification device (4) through the first water inlet pump (2) and the first water inlet valve (3). 90min, aeration for 120min, sedimentation for 30min, drainage for 20min, idle for 200min, 3 cycles / day, the temperature during oper...

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Abstract

A device and method for starting and stably maintaining short-cut nitrification of urban sewage belongs to the field of urban domestic sewage treatment. The device is mainly composed of a raw water tank, a short-range nitrification device for urban sewage, a full-process nitrification device, a sludge treatment device and a sludge return device. The method is to use the difference in the recovery rate of AOB and NOB after high-temperature treatment of activated sludge to start short-range nitrification, and combine the sludge treatment device to improve the operation stability of short-range nitrification, thereby starting and stably operating the short-range nitrification of urban sewage. The device is easy to operate, has a high degree of self-control, short-cut nitrification saves aeration, low sludge output, and reduces treatment costs.

Description

technical field [0001] A device and method for starting and stably maintaining short-range nitrification of urban sewage related to the present invention belongs to the field of biological treatment of urban sewage and is suitable for denitrification treatment of urban sewage with low carbon ratio; Background technique [0002] In recent years, the problem of eutrophication in my country's water bodies has occurred frequently. The reason is that the nitrogen and phosphorus elements in the water body exceed the standard. Therefore, urban sewage treatment plants have higher and higher requirements for nitrogen and phosphorus treatment; compared with phosphorus removal, nitrogen removal The problem is more urgent, and the process of denitrification needs to be improved urgently; [0003] The short-range nitrification and denitrification and short-range nitrification anammox denitrification processes that have emerged in recent years have many advantages, such as: saving aeration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/006C02F3/303C02F3/307
Inventor 彭永臻陈建飞张建华张亮孙雅雯王淑莹
Owner BEIJING UNIV OF TECH
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