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Biochemical sludge swelling control system and control method thereof

A control system, biochemical sludge technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of large killing of normal flora, insignificant regulation effect, and low operating cost and other problems, to achieve the effect of accelerating elimination, promoting cohesion, and achieving good results

Active Publication Date: 2015-05-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a biochemical sludge bulking control system and its control method in order to solve the problems of sludge bulking encountered in most urban sewage treatment plants and other industrial waste water biochemical treatment processes. Improved, targeted classification solves the problem of sludge settling, can effectively control sludge bulking in a short period of time, improve settling performance, restore the normal operation of the sewage plant, and overcome the traditional dosing that kills the normal flora and the single The disadvantage of insignificant process regulation effect can be applied to the sludge bulking problem caused by filamentous bacteria in the biochemical treatment process of urban, chemical, pharmaceutical and other wastewater, and the transformation investment is small, the process operation is simple, and the additional operating cost is low

Method used

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  • Biochemical sludge swelling control system and control method thereof
  • Biochemical sludge swelling control system and control method thereof
  • Biochemical sludge swelling control system and control method thereof

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Effect test

Embodiment 1

[0029] From figure 1 and figure 2 It can be seen that a biochemical sludge bulking control system in this embodiment includes a water inlet 1, a secondary settling tank 4 and a water outlet 5, and the bottom outlet of the secondary settling tank 4 is connected with a sludge return pipeline 12. Flow direction in return pipe 12, sludge return pump 6, shearer 7 and H 2 o2 The dosing pipe 8, wherein: the sludge return pump 6 is used to pump the sludge to the elutriation tank 2 along the return direction, and the shearer 7 is used to interrupt the mycelia of the filamentous fungus in the return sludge, H 2 o 2 The dosing pipe 8 is vertically connected to the sludge return pipe 12, and penetrates into the sludge return pipe 12, and is bent at 90° along the sludge return direction. The direction of the dosing port is consistent with the flow direction of the sludge. This setting can Effectively prevent the return sludge from entering the dosing pipe, which is conducive to smooth ...

Embodiment 2

[0039] A biochemical sludge bulking control system of this embodiment has the same basic structure as that of Embodiment 1.

[0040] A printing and dyeing wastewater treatment plant in Henan adopts the "grid-coagulation-sedimentation-hydrolysis acidification-biological selection-aerobic-secondary sedimentation" process, with a treatment capacity of 3,000 tons / day. Filamentous bacteria sludge often occurs, and the sludge volume index The SVI is as high as about 350ml / g, the abundance of filamentous bacteria is at the level e of the tank, the suspended solids in the effluent of the secondary sedimentation tank seriously exceed the standard (up to 500mg / L or more), and sludge is often lost.

[0041] Aiming at the specific problems existing in the printing and dyeing wastewater treatment plant, a biochemical sludge bulking control system of this embodiment is adopted. The control method of the control system includes the following steps:

[0042] Step 1: The return sludge in the s...

Embodiment 3

[0048] A biochemical sludge bulking control system of this embodiment has the same basic structure as that of Embodiment 1.

[0049]The sewage treatment plant of a printing and dyeing enterprise in Jiangsu adopts the process of "pH adjustment-coagulation sedimentation-UASB-aerobic-secondary sedimentation", the treatment capacity is 20,000 tons / day, the sludge settling performance is poor, and the sludge volume index SVI is 280ml / g Around, the abundance of filamentous bacteria is at the c-level of the pool, and the suspended solids index in the secondary sedimentation effluent is high (SS is about 100mg / L).

[0050] In view of the specific problems existing in the sewage treatment plant of the printing and dyeing enterprise, a biochemical sludge bulking control system of this embodiment is adopted. The control method of the control system has the following steps:

[0051] Step 1: The return sludge in the secondary settling tank 4 is transported into the shearer 7 through the sl...

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Abstract

The invention discloses a biochemical sludge swelling control system and a control method thereof, and belongs to the technical field of biological sewage treatment. The system disclosed by the invention comprises a water inlet, a secondary sedimentation tank and a water outlet, wherein the bottom end outlet of the secondary sedimentation tank is connected with a sludge return pipeline; a sludge return pump, a clipper and an H2O2 dosing pipe are sequentially mounted on the sludge return pipeline according to the flow direction of sludge in the sludge return pipeline; the sludge return pipeline and the water inlet are connected to the water inlet end of an elutriation pool; a Ca(ClO)2 dosing pipe and a first aerating branch pipe are arranged in the elutriation pool, the water outlet end of the elutriation pool is connected with an aerobiotic pool, and a second aerating branch pipe is arranged in the aerobiotic pool; the secondary sedimentation tank is connected with the aerobiotic pool through a pipeline, and a water outlet is formed in the secondary sedimentation tank. Through technological improvement, the system and method disclosed by the invention sort out and solve the problem of sludge settleability in a targeted manner, so that sludge swelling can be effectively controlled in a short term.

Description

technical field [0001] The invention relates to the technical field of sewage biological treatment, in particular to a biochemical sludge bulking control system and a control method thereof. Background technique [0002] Biochemical method is the most commonly used method in sewage treatment. In biological aerobic treatment, the good flocculation and settlement compression properties of sludge are the guarantee for the effluent of the secondary sedimentation tank to meet the standard. Sludge bulking is a phenomenon that often occurs in activated sludge treatment systems. It not only has a high incidence rate, but once it occurs, the sludge settling speed will slow down, the compression performance will deteriorate, and it will be difficult to separate solids and liquids, resulting in sludge loss, resulting in Water quality deteriorates. At the same time, sludge bulking also reduces the concentration of returning sludge, and the concentration of sludge in the aeration tank i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/1205C02F3/341C02F2303/06C02F2203/004Y02W10/10
Inventor 刘波丁新春李爱民周德超陆鑫王德朋
Owner NANJING UNIV
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