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System and method for removing total nitrogen from returned sludge by constant-water-level SBR process

A technology of returning sludge and constant water level, which is applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., and can solve problems such as difficult to meet standards, long cycle time, and additional carbon sources. Achieve the effects of stable water output, reduced operating costs, and low investment costs

Pending Publication Date: 2020-06-05
大连迈克环境科技工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the incoming water exceeds 70mg / L, it will be difficult to meet the standard
[0005] Although the SBR process does not have the problems of reflux and sludge concentration, it needs anaerobic and aerobic alternate operation, which has low efficiency and a long cycle
It usually takes 20 minutes for the dissolved oxygen to decrease to the anaerobic state after the aeration cycle is over. If you want to achieve the ideal effect of total nitrogen removal, you may need to stir the reaction for a long time, which cannot meet the growing urban sewage treatment capacity.
[0006] The main problem of the post-denitrification filter is that additional carbon sources (sodium acetate or methanol) need to be added, and the cost of water treatment is relatively high

Method used

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  • System and method for removing total nitrogen from returned sludge by constant-water-level SBR process
  • System and method for removing total nitrogen from returned sludge by constant-water-level SBR process
  • System and method for removing total nitrogen from returned sludge by constant-water-level SBR process

Examples

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Effect test

Embodiment 1

[0027] Such as Figure 1-Figure 4 As shown, a system for removing total nitrogen by returning sludge in a constant water level SBR process includes a CWSBR control zone 6, a CWSBR reaction zone 7 and a sludge return assembly. The CWSBR control zone 6 is equipped with a CWSBR water inlet 8 and an agitator 10. The CWSBR control area 6 and the CWSBR reaction area 7 are separated by a flexible water sail 1 and connected by a sludge return assembly. The sludge return assembly includes a return pump 4 and a return pipeline 5. The return pump 4 is located in the CWSBR In the reaction zone 7, the reflux pump 4 is connected to the CWSBR control zone 6 through the reflux pipeline 5, and the power of the reflux pump 4 is 7.5kw.

[0028] The sludge return assembly also includes a fixed bracket 2 and a return pump guide rail 3, the fixed support 2 is connected to the return pipeline 5 and fixed in the CWSBR reaction zone 7, and the upper end of the return pump guide rail 3 is connected to...

Embodiment 2

[0030] A method for removing total nitrogen using the system described in Example 1. For a constant water level CWSBR (constant water level SBR) reaction tank with a daily processing capacity of about 6,000 tons, a corresponding 150 cubic / hour reflux pump is designed, and the bracket , guide rail (70*70*4 square steel L=5600mm), return pipe (DN400) a set. At the same time, PLC is used to realize automatic control to keep it synchronized with the program in the main control room. The specific operation cycle sequence is: water intake + stirring for 22 minutes aeration for 30 minutes → water intake + stirring for 22 minutes aeration for 30 minutes → water intake + aeration Aeration for 22 minutes for 30 minutes → sedimentation for 48 minutes → decanting for 36 minutes → decanting for 15 minutes, the agitator in the control area is normally open on the spot, and the return pump is turned on at the end of the decanting until it is closed before the next sedimentation cycle of CWSBR...

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Abstract

The invention belongs to the technical field of environmental engineering sewage treatment, and particularly relates to a system and method for removing total nitrogen from return sludge of a constant-water-level SBR process. The device comprises a CWSBR control area, a CWSBR reaction area and a sludge backflow assembly, wherein a CWSBR water inlet, a stirrer and an aeration device are arranged inthe CWSBR control area; the CWSBR control area and the CWSBR reaction area are separated through a flexible water sail and are connected through a sludge backflow assembly; the sludge backflow assembly comprises a backflow pump and a backflow pipeline; the backflow pump is located in the CWSBR reaction area; the backflow pump is connected to the CWSBR control area through the backflow pipeline. The method has the advantages of low initial investment cost, no need of adding a carbon source, great reduction of the operation cost, no upper limit requirement on the total nitrogen of the incomingwater, no secondary pollution, no waste, no additive, high total nitrogen removal efficiency, and stable and up-to-standard effluent.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, and in particular relates to a system and a method for removing total nitrogen from return sludge in a constant water level SBR process. Background technique [0002] With the country's increasing discharge indicators for sewage plants, the original treatment process is often difficult to meet the discharge requirements. Many sewage plants are facing upgrades. Among them, total nitrogen, as an important discharge standard, has caused headaches for many water plants due to its intractability and high cost. [0003] At present, the methods for treating total nitrogen mainly include A2O process and SBR process of activated sludge process, and post-denitrification filter process. [0004] In order to achieve the sludge concentration and denitrification effect in the anaerobic zone, the traditional A2O usually needs to control the reflux ratio from 100% to 400%, wh...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/302
Inventor 王妍许亮孙晓波
Owner 大连迈克环境科技工程有限公司